Abstract: A bicycle torque detector includes a crank shaft formed with a first ring section and a second ring section; the first ring section serving for receiving a deformation sleeve accommodating ring and a deformable sleeve; the second ring section serving for receiving a circuit board ring; a circular casing serving to enclose all the crank shaft, the elastic ring, the sleeve, and the circuit board ring; wherein the first ring section of the crank shaft is formed with at least one resisting portion; the deformable sleeve has at least one resisting portion; the resisting portion of the crank shaft resists against one end of the deformation sleeve accommodating ring; another end of the deformation sleeve accommodating ring resists against the resisting portions of the deformable sleeve. A rear end of the deformable sleeve is engaged to a chain sleeve. The deformation sleeve accommodating ring is adhesive with sensing sheet.

Abstract: A wheel speed measuring device for an aircraft braking system uses dual technology packaged in a single transducer that incorporates the robust and reliable variable reluctance technology along with a secondary package for measuring position and velocity bi-directionally for low speed and taxi operations. The transducer of the present invention is preferably incorporated into the envelope of the axle to allow both retrofit on existing aircraft and to maintain existing axle design and configuration.

Abstract: A method for determining an efficiency and/or calibrating a torque of a drivetrain comprises two tests. The drivetrain has a motor-side end at a main shaft connectable to a motor and a generator-side end, with a generator arranged between the ends. In a first test, the motor-side end of the drivetrain is driven. A variable dependent on the main shaft torque is determined at the motor-side end of the drivetrain and an electrical power Pelec is determined at the generator-side end of the drivetrain. In a second test, the generator-side end of the drivetrain is driven and the variable dependent on the main shaft torque is determined at the motor-side end and the electrical power is determined at the generator-side end. An efficiency and/or calibration parameters is/are determined from the electrical power values and the variables dependent on the main shaft torque determined in the first test and second tests.

Abstract: A solution for noncontact optical torque measurement of a rotating component is provided. At least one imaging system acquires images of a rotating component. A torque computing unit determines the torque of the rotating component using the images. The torque computing unit can compare the acquired images to previously collected expected images obtained under a known torque condition. The torque computing unit determines the torque of the rotating component based on variations between the acquired images and the collected expected images.

Abstract: The invention relates to a method and device for determining the torque applied upon the rotary body that can be driven about an axis of rotation, comprising a first and a second sensor, which are respectively arranged with a fastening element at the rotary body at an axial distance from each other, and which comprise rings surrounding the rotary body comprising fields showing alternating different signal behaviors, with one transmitter being allocated jointly to the first sensor and the second sensor, which jointly accept from the two sensors an output signal, from which a square-wave signal is formed, from which in a first step from the flank distances of certain inclining and/or declining flanks of the square-wave signal constant values Ti, are formed, which are dependent on the geometry of the rings of the two sensors, and variable values ?i, which are dependent on the torque applied.

Abstract: There is provided an apparatus and method for measuring and monitoring the torque exerted by a cyclist during pedaling of a human-powered vehicle, as for example a bicycle, including an electromagnetic emitter which is adapted to be fixed securely to a rear wheel hub, for generating and directing a beam of electromagnetic radiation towards a rim of the wheel, and a detector mounted on the wheel for detecting the movement of the beam when torque is applied to the wheel, the movement being indicative of an angular displacement of the hub with respect to the rim and directly proportional to the torque. Either alone or using optical elements, the beam is directed to travel at least a distance between the emitter and the rim before detection. The measurement can be used to provide a power output.

Abstract: A torsion measurement device is disclosed. In one embodiment, the device includes a component having a marked surface and an optical sensor. The marked component and the optical sensor may be attached to a tube or other elongate member and positioned to enable the optical sensor to measure angular deflection of the tube from rotation of the marked component with respect to the optical sensor. The angular deflection may be combined with other data to determine applied torque and torsional stress on the tube or other elongate member. Additional systems, devices, and methods are also disclosed.

Abstract: An optical sensor, an optical encoder, a torque detection apparatus, and an electric power steering apparatus less affected by fluctuations in the amount of detected light and with an improved resolution are provided. The optical sensor includes a first polarizing layer that splits incident light to light with a first polarization direction, a first photoreceiver that receives first polarized light split by the first polarizing layer, a second polarizing layer that splits the incident light to light with a second polarization direction, and a second photoreceiver that receives second polarized light split by the second polarizing layer. The first photoreceiver and the second photoreceiver are positioned alternatingly and spaced uniformly with each other.

Abstract: This disclosure is directed to techniques for detecting one or more indications of rotational movement of a rotatable member. According to one example, at least one movement sensor is associated with the rotatable member and is configured to detect at least one measurement of rotational motion of the rotatable member. The at least one movement sensor is configured to be powered via at least one photoelectric element secured to the rotatable member. The at least one movement sensor is configured to communicate the at least one indication of the detected at least one measurement from the rotatable member via at least one wireless communications module associated with the rotatable member and powered via the at least one photoelectric element.

Abstract: Fabry-Perot and Bragg grating optical measuring principles are combined with a torsional stress sensing mechanism that converts torque applied in one fluid environment to force exerted in a second environment to measure extreme environmental parameters such as pressure in a petroleum producing borehole.

Abstract: According to one aspect of the invention, a method for calibrating a torque measurement for a rotatable object is disclosed, wherein the method includes coupling the rotatable object to a structure, the structure including a member extending along a length of a surface of the rotatable object, coupling the rotatable object to an adapter and applying a known torque to the rotatable object via the adapter. The method also includes measuring a first rotational displacement via a first sensor coupled to the member at a first axial location of the rotatable object, measuring a second rotational displacement via a second sensor coupled to the member at a second axial location of the rotatable object and determining first and second angular displacements of the rotatable object based on the first and second rotational displacements.

Abstract: Methods and apparatus are provided for determining torque in an environmentally isolated system. A drive system is coupled to the environmentally isolated system via a non-contact, magnetic coupling that has a known angular stiffness and at least two coupling sections. A relative deflection of each coupling section is optically measured, and the torque is determined based on the relative deflection and the known angular stiffness.

Abstract: A fiberoptic multi-parameter sensing system for monitoring turbomachinery system shaft static and dynamic torques, vibration modes and associated operation status includes a multi-furcated fiber bundle based optical splitter configured to transmit light to a surface of at least one turbomachinery system shaft through a plurality of optical fiber bundles disposed at a plurality of locations in proximity to the surface of the at least one shaft, in which the plurality of locations together are arranged in a substantially axial direction between the ends of the at least one shaft.

Abstract: A strain sensor apparatus for a rotatable shaft including a radiation emitter/receiver, a vibration element attached to the shaft and a radiation-reflective annulus surrounding the shaft and vibration element.

Abstract: A strain sensor apparatus for a rotatable shaft including a radiation emitter/receiver, a vibration element attached to the shaft and a reflector that is positioned to reflect radiation onto the vibration element.

Abstract: Methods and apparatus are provided for determining torque in an environmentally isolated system. A drive system is coupled to the environmentally isolated system via a non-contact, magnetic coupling that has a known angular stiffness and at least two coupling sections. A relative deflection of each coupling section is optically measured, and the torque is determined based on the relative deflection and the known angular stiffness.

Abstract: A device for measuring torque applied through a rotating member. A first torsion reference member is fixedly coupled to the rotating member at a first axial position and a second torsion reference member is fixedly coupled to the rotating member at a second axial position. A first detector detects the passage of the first torsion reference member past the first detector upon each full rotation of the rotating member and to generate a first signal upon each passage of the first torsion reference member. A second detector detects the passage of the second torsion reference member past the second detector upon each full rotation of the rotating member and to generate a second signal upon each passage of the second torsion reference member. A controller calculates a phase difference between the first signal and the second signal relative during rotation of the rotating member under a torsional load.

Abstract: The method measures consistency with a rotating consistency meter. The method comprises chopping with the teeth of a chopper structure optical radiation transmitted by an optical source to an optical detector while the shafts of the rotating consistency meter rotate. In addition, a chopper reference of the chopper structure chops optical radiation to form at least one reference pulse independent of the swivel between the shafts. The duration of each reference pulse is measured when measuring consistency. The change in the reference pulse is defined by comparing the duration of the measured reference pulse with the duration of the predefined reference pulse. The durations of the measuring pulses are corrected according to the change in the duration of the reference pulse.

Abstract: [Problems] To provide a torque measurement device capable of more accurately specifying positions of reflectors which are attached to a rotating body, and more accurately obtaining a torque of the rotating body. [Means for Solving Problems] A pair of reflectors (14a, 14b) is provided on the surface of the rotating body (13) and has a spacing in the axial direction, reflected light data obtained by reflection of reflection patterns in the pair of reflectors (14a, 14b) is input and stored, a point of minimizing AIC is determined for a model of the reflected light data from the rotating body (13), and existence regions of the pair of reflectors (14a, 14b) are detected. Then, a twist amount of the rotating body (13) is calculated from the reflector positions specified by the detected existence regions of the pair of reflectors (14a, 14b), and the torque is calculated from the calculated twist amount of the rotating body.

Abstract: [Problems] To provide a torque measurement device capable of more accurately specifying positions of reflectors which are attached to a rotating body, and more accurately obtaining a torque of the rotating body. S [Means for Solving Problems] A signal processing device (16) irradiates the surface of the rotating body (13) with laser light from a laser light output device (11) via a light transmitting/receiving device (12), and obtains the torque of the rotating body (13) by using a reflection patterns from reflectors (14a, 14b) provided on the surface of the rotating body (13).

Abstract: A torque sensor that includes a sensor housing, a sensor input member at least partially received in the sensor housing, a sensor output member at least partially received in the sensor housing, a torsionally resilient coupling member that couples the sensor input member to the sensor output member and an optical sensor system that includes a light source, one or more encoders and one or more optical sensors. The encoder or encoders periodically transmit light between the light source and the at least one optical sensor based on an amount of relative rotation between the sensor input member and the sensor output member.

Abstract: Presented herein is a non-contact torque sensing apparatus and method for measuring the instantaneous torque, or torsional stress/strain, transmitted through an elongated power transmission member such as a rotatable shaft. Polarized light is directed along a measurement light path in a cavity of a shaft where it intercepts a polarizing filter. The polarizing filter is operable to alter the polarization angle of the light according to torsional twisting of the shaft. A measurement device measures the change in the polarization angle of the light to obtain the shaft twist angle. Shaft torque is then calculated from the twist angle.

Abstract: An apparatus for determining the torque imposed on a rotatable shaft. The shaft has at least four paired probes, paired horizontal probes and paired vertical probes. The horizontal probes are positioned 90 degrees apart from the vertical probes. If the shaft moves horizontally, the time of arrival detected by the first horizontal probes will be later than a nominal value and the time of arrival for the second horizontal probes will be earlier than a nominal value with the same amount of error. Combining data from the first and second horizontal probes will then automatically cancel out any error from horizontal motion. Similarly, combining data from vertical probes will eliminate the error due to vertical movement. Because any radial movement is a combination of horizontal and vertical movements, the use of the probes removes errors due to movement in any direction.

Abstract: A device is described for determining the torque which is applied to a turbine shaft (10), the determination device having at least one system for contactless measurement of the integral torsion of the turbine shaft (10) and a unit for contactless measurement of the restoring constant of the turbine shaft (10). Furthermore, a method is described for determining the torque which is applied to the low-pressure turbine shaft (10) of a turbine engine, which is distinguished in that, to determine the torque, the integral torsion of the turbine shaft is measured by a contactless method and the restoring constant of the turbine shaft is measured.

Abstract: A torque sensor that includes a sensor housing, a sensor input member at least partially received in the sensor housing, a sensor output member at least partially received in the sensor housing, a torsionally resilient coupling member that couples the sensor input member to the sensor output member and an optical sensor system that includes a light source, one or more encoders and one or more optical sensors. The encoder or encoders periodically transmit light between the light source and the at least one optical sensor based on an amount of relative rotation between the sensor input member and the sensor output member.

Abstract: A torque measuring device for a rotating body is provided, which includes: a stationary section; a rotary section; a rotary transformer composed of a primary coil disposed at the stationary section, and a secondary coil disposed at the rotary section, wherein an electric power is transmitted from the stationary section to the rotary section by electromagnetic induction, a torque generated at a rotating body is detected at the rotary section by means of the electric power transmitted, and wherein a detection result is transmitted from the rotary section to the stationary section. In the torque measuring device, a capacitor is connected at the side of the secondary coil of the rotary transformer, and a series resonant circuit is formed by the capacitor in combination with a leakage inductance of the rotary transformer.

Abstract: A torque detection system is provided for detecting torque applied to a rotary shaft. A spring element is connected to an input and output shaft. As torque is applied to the shaft system, the input shaft is rotationally offset from the output shaft and a sensing system is provided for sensing the amount of rotational offset which is then correlated to a rotational torque level.

Abstract: A torque measuring device for a rotating body comprises: a rotary section including first and second flanges provided respectively at driving and driven sides, and a hollow cylinder provided between the first and second flanges; light emitting elements provided at an outer circumference of the rotary section, and adapted to emit light based on output from each of torque detectors provided at an inner surface of the hollow cylinder thereby sending an optical signal; a light conductive member to receive the optical signal at a light receiving surface thereof, and to guide the optical signal along its longitudinal directions; and a torque calculator to calculate torque of the rotary section based on the optical signal guided by the light conductive member, wherein the light conductive member has an optical path converting means formed at either the light receiving surface or a surface thereof opposite to the light receiving surface.

Abstract: Light irradiation detecting sections for irradiating laser light to reflectors of a rotational body and receiving the reflected light are downsized. A light transmitting and receiving device 21 has incident light receiving fibers 25a and 25b for guiding both incident light and reflected light and light irradiation detecting sections 11a and 11b, as well as polarization-maintaining fiber circulators 24a and 24b. The light transmitting and receiving device is structured such that reflected light is received through the same light path as the light path for outputting laser light from a laser light output device 20 through a branch connector 23.

Abstract: A torque detection system is provided for detecting torque applied to a rotary shaft. A spring element is connected to an input and output shaft. As torque is applied to the shaft system, the input shaft is rotationally offset from the output shaft and a sensing system is provided for sensing the amount of rotational offset which is then correlated to a rotational torque level.

Abstract: A torsional vibration measuring instrument has a plurality of reflecting means (6, 7) arranged with stipulated intervals along surface of a rotator (5) of which torsional vibration is to be measured; a pulse light irradiating means (1, 2) for irradiating a repetitive pulse light beam to the reflecting means; and an outgoing-transmitting means (3, 4) for transmitting the irradiated pulse light beam. The torsional vibration measuring instrument also has a plurality of transmitting-receiving means (8, 9) for irradiating the transmitted pulse light beam to the reflecting means, and for receiving reflected pulse light beams which have been reflected by the reflecting means; and an incoming-transmitting means (3, 4) for transmitting the reflected pulse light beams which have been received.

Abstract: A torque measuring device for a rotating body includes: a rotary section integrally including a first flange, a second flange, and a hollow cylinder disposed between the first and second flanges; a plurality of torque detectors disposed at the inner circumference of the hollow cylinder; and a light receiving unit. The torque measuring device described above further includes: a light emitting element disposed at the rotational center axis of the rotary section and adapted to emit light based on an output from each of the torque detectors thereby sending an optical signal; a light branching unit to branch the optical signal into a plurality of subsequent signals; and a plurality of passages formed in the rotary section and allowing respective subsequent signals to exit out the rotary section and to be received by the light receiving unit.

Abstract: First and second targets, the numbers of which are coprime, are provided at a rotor. Two detecting means oppose each of the first and second targets to output detection signals having phases different from each other in accordance with each position of the targets as the rotor rotates. The rotational angle detecting apparatus has calculating means for executing a predetermined calculation based on each detection signal of the two detecting means and storage means for storing a relation between a result of calculation executed in advance by the calculating means and an electrical angle of a detection signal, obtains an electrical angle of each detection signal by referring to the storage means using a calculation result of the calculating means and detects a rotational angle of the rotor based on the obtained electrical angle. Consequently, no discontinuous portion forms in a detected steering angle signal and the differential signal thereof.

Abstract: A torque measuring device for a rotating body comprises: a rotary section composed of first and second flanges to be joined respectively to driving and driven shafts, and a hollow cylinder having the first and second flanges formed respectively on both edges thereof; torque detectors provided at an inner circumference of the cylinder; light emitting elements provided at an outer circumference of the rotary section and adapted to emit light according to an output from the torque detectors thereby generating an optical signal; a light receiving fiber disposed outside the rotary section and adapted to receive the optical signal from the light emitting elements; and a rotary transformer composed of a primary coil constituted by an annulus with two-part separable structure disposed outside the rotary section and a secondary coil provided at the outer circumference of the rotary section, and adapted to supply electrical power to the rotary section.

Abstract: The present invention provides a method and apparatus for applying a uniformly-distributed pattern of stripes (8) on a component (6) of a large rotary machinery, such as an industrial generator. A method is provided that comprises measuring the circumferential area of the component (6) with a measuring element (14). The precise circumference is indicated and a desired number of pattern segments is determined. The circumference is divided by this number to produce equally spaced segments. This is then transferred to the rotor shaft (6) by marking on the measuring element (12) the number of segments and making a copy of the markings onto a second strip (14). These strips are then aligned on the circumferential area and cross strips (22) are placed at each of the segment marks (16). The segment areas not covered by the cross strips (24) are then painted in a color that is optically distinguishable from the non-painted regions.

Abstract: A torque measuring device for a rotating body comprises: a rotary section including first and second flanges provided respectively at driving and driven sides, and a hollow cylinder provided between the first and second flanges; light emitting elements provided at an outer circumference of the rotary section, and adapted to emit light based on output from each of torque detectors provided at an inner surface of the hollow cylinder thereby sending an optical signal; a light conductive member to receive the optical signal at a light receiving surface thereof, and to guide the optical signal along its longitudinal directions; and a torque calculator to calculate torque of the rotary section based on the optical signal guided by the light conductive member, wherein the light conductive member has an optical path converting means formed at either the light receiving surface or a surface thereof opposite to the light receiving surface.

Abstract: A system and method relating to the measuring of torque in a rotating shaft is provided. An optical torque sensing system comprises a rotating shaft, wherein a sleeve of photo-elastic material overlays a portion of the shaft. A light emitting component delivers light into the photo-elastic material, wherein the light delivered by the light emitting component is directed through the photo-elastic material along an axis of the rotating shaft. A capturing component captures the light that exits the photo-elastic material. The exiting light comprises fringe pattern data, and a computing system computes torsion strain of the shaft based at least in part on the fringe pattern information.

Abstract: A device for measuring an angle and/or the torque acting on a rotatable body is proposed according to the invention, whereby the rotational angle is detected by means of magnetic or optical sensors. In particular, in a preferred exemplary embodiment, two devices (7, 8) are proposed, each of which comprises two optically readable code tracks. The two code tracks (1a, 1b or 2a, 2b) on one device (7 or 8) are similar in design and are offset in relation to each other, so that associated sensors (4) output a digital signal. The rotational angle is calculated based on the lag between the two digital signals. In a further embodiment it is provided that a torsion element (5) having a known torsional stiffness is situated between the two devices (7, 8). Torque transferred by the rotatable body (3) can also be calculated therefore from the angular difference of the two devices 7, 8. The device is used preferably in the steering axle of a motor vehicle.

Abstract: An arrangement for the detection of relative movements of two objects with four measuring cells as vertical measuring device for the detection of a relative movement perpendicular to an imaginary plane, with the measuring cells being arranged in such a manner that their vertical projections onto the plane are arranged at an identical angular distance from each other about a centre. Further, a force and/or moment sensor with a first board and a second board which are elastically connected with each other and movable relative to one another.

Abstract: An optical torque sensor comprises a radiation source emitting radiation of at least one wavelength. At least one sensor senses the emitted radiation and generates at least one intensity signal indicative of the intensity of the emitted radiation. At least one signal conditioner is receptive of the emitted radiation and is positioned on a shaft between the radiation source and the at least one sensor thereby conditioning the emitted radiation. A circuit is receptive of the at least one intensity signal and determines the torque acting upon the shaft and compensates for the attenuation of the emitted radiation.

Abstract: A torque measuring apparatus includes a rotor having a hollow body portion formed between a drive-side flange portion and a load-side flange portion. Light emitting elements are disposed on a periphery of the rotor, for emitting optical signals based on an output from a torque detection unit attached to a hollow portion of the hollow body portion. A transparent plate attached to a chassis is disposed outside the rotor, for allowing the optical signals to pass therethrough, and a signal receiving unit is arranged on the chassis, for receiving the optical signals via the transparent plate, wherein the transparent plate is detachable from the chassis.

Abstract: A torque measuring device for a rotating body comprises: a rotary section composed of first and second flanges to be joined respectively to a driving shaft and a driven shaft, and a hollow cylinder having the first and second flanges formed respectively on both edges thereof; light emitting elements provided at an outer circumference of the rotary section and adapted to emit light according to an output from torque detectors provided at an inner circumference of the cylinder thereby generating an optical signal; a light receiving fiber to receive the optical signal from the light emitting elements; optical-electrical signal converters provided so as to face both end surfaces of the light receiving fiber, and adapted to convert the optical signal into an electrical signal; and a malfunction detector to detect malfunction of the light receiving fiber according to the electrical signal from the optical-electrical signal converter.

Abstract: The invention provides a method/system for measuring torque. The method/system includes providing a first rotating disk A having a target pattern and providing a second rotating disk B having a target pattern. The method/system includes providing a first set of at least three sensors, comprised of a first disk first sensor (1A), a first disk second sensor (2A), and a first disk third sensor (3A), the first set of al least three sensors for sensing the first rotating disk target pattern with the first set of at least three sensors fixed around and encompassing the first rotating disk. The method/system includes providing a second set of at least three sensors, comprised of a second disk first sensor (1B), a second disk second sensor (2B), and a second disk third sensor (3B), the second set of at least three sensors for sensing the second rotating disk target pattern, with the second set of at least three sensors fixed around and encompassing the second rotating disk.

Abstract: An apparatus and method for noncontact, optical measuring of any of torque, torque angle, shaft speed, and shaft direction by at least one of a rotatable and compressible flexure with input and output ends plus input and output couplers, a light source for generating a light signal, a field mask formed of a pattern of opaque and transparent lines adapted to receive the light signal and generate a phase shifted light signal, and detector means for receiving a light signal from overlaid lines on the flexure and the field mask. Alternatively, the detector means may receive the light signal from overlaid lines on the input and output couplers of the flexure and the field mask and generate an output signal indicative of the combined pattern of the lines.

Abstract: Systems and methods analyze the performance of a mechanical system having two identical rotating members therein. Light is directed from two identical light sources to intercept encoded portions of the rotating members. A portion of the light is reflected from the encoded portions of each rotating member. The reflected portion of the light can be then detected to recover performance data maintained therein, wherein the performance data contains performance characteristics of the mechanical system. A reflected portion of the light can be detected to recover performance data. The light sources can be configured as Vertical Cavity Surface Emitting Lasers (VCSEL). The encoded portions of rotating members thereof can include a bar code. Images from a first encoded surface may interact with an image from a second encoded surface after the light beams are reflected off the first and second rotating surfaces to produce Moirè fringes.

Abstract: A rotary shaft axial elongation measuring method and device enable accurate measuring of rotary shaft axial elongation regardless of the amount of the elongation. Grooves (10, 12), arranged opposite to each other in a turned V shape along the axial direction, are provided in a rotational surface of the rotary shaft (1) whose axial elongation is to be measured. A sensor (14) is arranged opposite the rotational surface of the rotary shaft (1). The sensor (14) generates pulses upon passing of the groves (10, 12) following rotation of the rotary shaft (1). As a circumferential interval between the grooves (10, 12) differs according to the axial directional position of the rotary shaft (1), if the positions of the grooves (10, 12) at the position of the sensor (14) change due to the axial elongation, the interval of the pulses generated by the sensor (14) changes. Thus, by the change in the pulse generation interval, the axial elongation is measured.

Abstract: To achieve the improvement in workability of attachment or detachment of a light receiving fiber for receiving a torque optical signal from a rotor, as well as the improvement in the light receiving efficiency of optical signals, a torque measuring apparatus comprises a rotor having a hollow body portion formed between a drive-side flange portion and a load-side flange portion; light emitting elements disposed on a periphery of the rotor for emitting optical signals based on an output from a torque detection unit arranged on a hollow portion of the hollow body portion; a diffusion means for diffusing the optical signals; and a light receiving fiber attached to a chassis disposed outside the rotor for receiving the optical signals via the diffusion portion.

Abstract: A torque measuring apparatus of the present invention comprises a rotor having a hollow body portion formed between a drive-side flange portion and a load-side flange portion; light emitting elements disposed on a periphery of the rotor, for emitting optical signals based on an output from a torque detection unit attached to a hollow portion of the hollow body portion; a transparent plate attached to a chassis disposed outside the rotor, for allowing the optical signals to pass therethrough; and a signal receiving unit arranged on the chassis, for receiving the optical signals via the transparent plate, wherein the transparent plate is detachable from the chassis.

Abstract: A torque measuring device for a rotating body comprises: a rotary section composed of first and second flanges to be joined respectively to a driving shaft and a driven shaft, and a hollow cylinder having the first and second flanges formed respectively on both edges thereof; light emitting elements provided at an outer circumference of the rotary section and adapted to emit light according to an output from torque detectors provided at an inner circumference of the cylinder thereby generating an optical signal; a light receiving fiber to receive the optical signal from the light emitting elements; optical-electrical signal converters provided so as to face both end surfaces of the light receiving fiber, and adapted to convert the optical signal into an electrical signal; and a malfunction detector to detect malfunction of the light receiving fiber according to the electrical signal from the optical-electrical signal converter.

Abstract: A torque measuring device for a rotating body comprises: a rotary section composed of first and second flanges to be joined respectively to driving and driven shafts, and a hollow cylinder having the first and second flanges formed respectively on both edges thereof; torque detectors provided at an inner circumference of the cylinder; light emitting elements provided at an outer circumference of the rotary section and adapted to emit light according to an output from the torque detectors thereby generating an optical signal; a light receiving fiber disposed outside the rotary section and adapted to receive the optical signal from the light emitting elements; and a rotary transformer composed of a primary coil constituted by an annulus with two-part separable structure disposed outside the rotary section and a secondary coil provided at the outer circumference of the rotary section, and adapted to supply electrical power to the rotary section.