Abstract: In one embodiment, a method includes causing a radar antenna to transmit a plurality of radar signals at a plurality of sweep angles and, for each of one or more the radar signals reflected back to the radar antenna, calculating a radial-velocity component. The method also includes identifying one of the radial-velocity components, identifying one of the plurality of sweep angles corresponding to the identified radial-velocity components, and calculating an offset of an electrical boresight of the radar antenna based at least in part on the identified sweep angle corresponding to the identified radial-velocity component.

Abstract: A mouse device includes a casing, a scroll wheel, a circuit board, an encoder and a microprocessor. The scroll wheel is partially exposed outside the casing. The circuit board is disposed within the casing. The encoder is disposed within the casing. The encoder issues an encoded signal to the circuit board in response to a rotation of the scroll wheel. The microprocessor is electrically connected with the circuit board, and acquires a rotating time period corresponding to one-unit rotation amount of the scroll wheel. If the rotating time period is shorter than a predetermined time period, the microprocessor generates a first control command. If the rotating time period is longer than or equal to the predetermined time, the microprocessor generates a second control command.

Abstract: There is provided a semi-circular resonator using a whispering gallery mode (WGM) and an optical sensor using the same. Accordingly, an active region that is a waveguide of an active layer in which laser oscillation is caused by gains of advancing beams is deeply etched in a semi-circular or semi-ring shape.

Abstract: Conductive cooled gimbaled inertial measurement units are disclosed herein. An example apparatus includes an inertial measurement unit, a gimbal assembly in which the inertial measurement unit is disposed, the gimbal assembly having gaps between each gimbal of the gimbal assembly, the gaps including a gas to conduct heat from the gimbal assembly, and an isothermal dome at least partially surrounding the gimbal assembly, the isothermal dome having a cooling tube disposed on an external surface of the isothermal dome to transfer heat from the gimbal assembly via conduction.

Abstract: A method of determining the eccentricity of an encoder scale member of a rotary encoder includes taking an encoder scale blank having a geometric center and mounting the encoder scale blank centered about a second center. A scale can then be produced on the encoder scale blank thereby forming an encoder scale member. The scale of the encoder scale member is centered about the second center. Any eccentricity between the geometric center and the second center is measured by, for example, measuring any change in the apparent radius of the encoder scale member. The encoder scale member may then be mounted in a working location wherein it is rotated about a third axis. The eccentricity when mounted in the working location may be matched to that measured during manufacture thereof and/or the eccentricity errors arising from both manufacture and mounting of the encoder scale member may be determined.

Abstract: An optical encoder is disclosed, in particular, which has a light sensing element with light-sensing cells arranged in a matrix. The light sensing element repeatedly detects the same reflective light beam by different rows of light-sensing cells to increase the precision of feedback control. Furthermore, since the light sensing element synchronously and repeatedly receives the reflective light beam, the reliability of detected signals is increased.

Abstract: A ring laser gyro includes a tapered portion in a part of an optical waveguide, a plurality of ring resonator semiconductor lasers optically independent of each other on a common plane, and a plurality of electric terminals for detecting a change in the impedances of said ring resonator semiconductor lasers. The tapered portion includes a first portion where a width of the optical waveguide is gradually widened along a direction of propagating a laser beam clockwise and a second portion where the width of the optical waveguide is gradually narrowed along the direction, and further comprising a first ring resonator semiconductor layer in which said first portion is longer than the second portion, and a second ring resonator semiconductor layer in which said second portion is longer than the first portion.

Abstract: A noise reducing thermal-electrically cooled photodetector for an Interferrometric Fiber Optic Gyro (IFOG) includes a photodiode that converts an optical power signal received from a coupler of the IFOG to an electrical compensation signal. The photodiode is in mechanical contact with one or more thermoelectric coolers (TEC) to lower an operating temperature of the photodiode. The photodetector also includes an amplifier circuit to amplify the electrical compensation signal. The amplifier circuit includes an operational amplifier having an input and an output, with a feedback resistor interposed between the input and output. The feedback resistor is also in mechanical contact with a TEC to lower an operating temperature of the feedback resistor. By reducing the operating temperature of the feedback resistor and the photodiode the thermal noise of the IFOG is reduced.

Abstract: An angular velocity detector comprising a ring laser having a tapered light waveguide path which has an asymmetrical shape at least in a portion of the tapered light waveguide path so that laser beams propagating circumferentially in rotational directions reverse to each other have oscillation threshold values which are different from each other, an optical gyroscope having a terminal which detects a change of at least one of a current, a voltage and impedance of the ring laser, a measuring device for measuring information of a period or a frequency of the current, the voltage and the impedance outputted from the terminal of the above described optical gyroscope, a first output circuit for outputting information of the period or the frequency of at least one of the current, the voltage and the impedance outputted from the above described terminal when the above described optical gyroscope is not subjected to an angular velocity, and a calculation circuit for inputting a result measured by the above described

Abstract: A gyro comprises a ring resonator type laser, a vibration table for applying an oscillation to the laser, and a signal processor for processing an output signal from the laser. The signal processor determines the phase angle of the output signal from the amplitude of an oscillation cycle component of the vibration table and that of a higher harmonic component thereof.

Abstract: An hermetically sealed fiber optic gyroscope assembly has loops of optic fiber on a support ring in a sealed casing comprising a base plate, a perimeter wall upstanding from the base plate and a cover secured to the perimeter of the wall, together with optical circuitry located within the casing for directing light around the optic fibre loops together with electrical connecting circuitry passing from the optical circuitry to external terminals in sealed engagement with the casing.

Abstract: Method and device for correcting shooting errors. Such shooting errors are to be corrected that are occasioned by a movement of a barrel (12) of a gun (10) out of its nominal position in consequence of a movement of a lower carriage (18) when a shot is being fired. By means of an angle meter element, an error angle is determined along which the lower carriage rotates about the vertical axis (Z). An error signal is obtained from the error angle. Said error signal is utilized to change the azimuth of the barrel of the weapon (12) in order to compensate an error of the azimuth and of the elevation occasioned by the rotation of the lower carriage (18) about the vertical axis (Z).

Abstract: A method and apparatus for stabilizing the scale factor of a fiber optic gyroscope in which a superluminescence diode or broadband multimode laser comprises the light source. The emission bandwidth injected into a fiber end from the light source is limited to a considerably narrower transmission bandwidth within the wavelength band of the intensity characteristic of the light by a narrowband optical filter. The temperature at the filter is measured, and the transmission bandwidth quickly corrected by means of a pre-calibrated look-up table when optical interference filters are employed. The readjusted wavelength value is used for scale factor calculations.

Abstract: A noise reducing thermal-electrically cooled photodetector for an Interferrometric Fiber Optic Gyro (IFOG) includes a photodiode that converts an optical power signal received from a coupler of the IFOG to an electrical compensation signal. The photodiode is in mechanical contact with one or more thermoelectric coolers (TEC) to lower an operating temperature of the photodiode. The photodetector also includes an amplifier circuit to amplify the electrical compensation signal. The amplifier circuit includes an operational amplifier having an input and an output, with a feedback resistor interposed between the input and output. The feedback resistor is also in mechanical contact with a TEC to lower an operating temperature of the feedback resistor. By reducing the operating temperature of the feedback resistor and the photodiode the thermal noise of the IFOG is reduced.

Abstract: An angular velocity detector comprising a ring laser having a tapered light waveguide path which has an asymmetrical shape at least in a portion of the tapered light waveguide path so that laser beams propagating circumferentially in rotational directions reverse to each other have oscillation threshold values which are different from each other, an optical gyroscope having a terminal which detects a change of at least one of a current, a voltage and impedance of the ring laser, a measuring device for measuring information of a period or a frequency of the current, the voltage and the impedance outputted from the terminal of the above described optical gyroscope, a first output circuit for outputting information of the period or the frequency of at least one of the current, the voltage and the impedance outputted from the above described terminal when the above described optical gyroscope is not subjected to an angular velocity, and a calculation circuit for inputting a result measured by the above described

Abstract: A gyroscope which utilizes light waves to sense motion in the plane of the substrate. The gyroscope has a primary optical waveguide which is adapted to pass light from a single light source through the primary optical waveguide in both directions. The light exiting from each end of the primary optical waveguide is withdrawn and passed through two dedicated waveguides (one dedicated waveguide for each end of the primary optical waveguide). Preferably, these two dedicated waveguides have differing times for light travel such that one of the dedicated waveguides emits its light one-quarter wavelength behind the other dedicated waveguide. The light being emitted from each dedicated waveguide is then combined permitting a sensor to monitor any shifts between the two light signals as a monitor to motion of the primary optical waveguide.

Abstract: A nested fiber optic gyro system includes at least a first fiber optic coil having a predetermined shape and size and at least a second fiber optic coil having the same shape and size as the first coil and nested within and transversely to the first coil.