Abstract: A Broadband Diffractive-Optical Element (BDOE) as a lens whose f-number and numerical aperture are decoupled. The BDOE can include a substrate and an array of optical cells formed on the substrate to have a non-linear arrangement of cell heights to diffract light into a focal spot. The geometry of the focal spot can be designed to decouple the f-number from the numerical aperture for an imaging device that employs the broadband diffractive optical element as a lens.

Abstract: An imaging apparatus includes an image sensor, a filter array disposed on an optical path from a target object to the image sensor and including two-dimensionally-arranged optical filters, and a processing circuit that generates at least four pieces of spectral image data based on an image acquired by the image sensor. The optical filters include various types of optical filters with different spectral transmittance. Each of the at least four pieces of spectral image data indicates an image corresponding to one of at least four wavelength bands. The filter array includes at least one characteristic section. The processing circuit detects a relative position between the filter array and the image sensor based on the at least one characteristic section in the image acquired by the image sensor, and compensates for deviation between the relative position and a preliminarily-set relative position when the processing circuit detects the deviation.

Abstract: An aeration diffuser system includes an air inlet conduit defining an orifice, an air plenum coupled to the air inlet conduit at the orifice, such that the air plenum and the air inlet conduit are in fluid communication, a diffuser secured to a top of the air plenum, and a plurality of pressure transducers including a first pressure transducer at least partially located inside the air inlet conduit, and a second pressure transducer at least partially located inside the air plenum.

Abstract: A tool device (1) for machining a workpiece (4) by cutting, milling, drilling or grinding, comprising a sensor (20) for detecting a condition of the tool device (1) during machining, wherein the sensor (20) is connectable to a receiving unit (40), which transmits data to an analysis unit (50) for analyzing the received data. The sensor (20) is configured as a fiber optic sensor (20) comprising at least one optical fiber (26) providing an incident optical path (22) and a reflected optical path (24) for a light beam emitted by a connectable light source (30) and with a distal end thereof lying in a surface (14, 74) of the tool device (1) such that the optical path length can be measured.

Abstract: A method is disclosed of fabricating a mirror for use in limited rotation motor systems, said method comprising the steps of providing a mirror structure including at least one wall section, and exposing the at least one wall section to a fluid etching agent to thereby provide chemical milling of the mirror structure.

Abstract: An autocorrelation measurement device includes a first reflection member, a second reflection member, a focusing unit, a nonlinear optical crystal, a detection unit, a filter, an aperture, a delay adjusting unit, and an analysis unit. Incident pulsed light is transmitted through the second reflection member and incident on the first reflection member. First pulsed light reflected on a first reflection surface of the first reflection member and a second reflection surface of the second reflection member and second pulsed light reflected on a second reflection surface of the first reflection member and a first reflection surface of the second reflection member are incident on the nonlinear optical crystal via the focusing unit. Second harmonic light generated in the nonlinear optical crystal is detected by the detection unit.

Abstract: An optical sensor (100) comprises: a holding sleeve (11); a fixed ferrule (12) fixedly mounted in said holding sleeve (11); a movable ferrule (13) movably mounted in said holding sleeve (11), a predetermined distance existing between a first movable end of said movable ferrule (13) and a first fixed end of said fixed ferrule (12) in said holding sleeve (11); a reflection part (14) arranged at a second movable end of said movable ferrule (13) opposite to said first movable end, for reflecting light entering the movable ferrule (13); and an actuation part (15), said actuation part (15) being constructed to drive said movable ferrule (13) to move so that said first movable end moves towards said first fixed end. An optical sensor assembly and a monitoring device comprising the optical sensor (100), or another sensor (1012) can remotely detect a mechanical movement in a passive mode. A first reflector (14, 1016) is configured to provide a first reflected optical signal.

Abstract: An optical sensor (100) comprises: a holding sleeve (11); a fixed ferrule (12) fixedly mounted in said holding sleeve (11); a movable ferrule (13) movably mounted in said holding sleeve (11), a predetermined distance existing between a first movable end of said movable ferrule (13) and a first fixed end of said fixed ferrule (12) in said holding sleeve (11); a reflection part (14) arranged at a second movable end of said movable ferrule (13) opposite to said first movable end, for reflecting light entering the movable ferrule (13); and an actuation part (15), said actuation part (15) being constructed to drive said movable ferrule (13) to move so that said first movable end moves towards said first fixed end. An optical sensor assembly and a monitoring device comprising the optical sensor (100), or another sensor (1012) can remotely detect a mechanical movement in a passive mode. A first reflector (14, 1016) is configured to provide a first reflected optical signal.

Abstract: A solid state imaging device includes an array of active pixels and an infrared cut filter formed over the sensor. Optionally, a slot in the infrared cut filter allows infrared illumination to reach the sensor to be detected by pixels covered by a visually opaque filter and surrounded by pixels of special types that limit charge leakage and enable high dynamic range sensing of infrared illumination. A ratio of average infrared signal to average brightness indicates an amount of infrared illumination reaching the imaging device.

Abstract: A composite material comprises a polymer matrix; and zeolite, which is bonded in the polymer matrix; wherein the percent of volume of the zeolite in the volume of the composite material amounts to at least 50%, in particular at least 65%. The polymer matrix can in particular comprise a polymer, which is selected from a group of polymers that consist of fluoroplastics, polyaryletherketones, sulphur-containing polymers and high heat resistant polymers. The zeolite comprises in particular a zeolite of type A, in particular a zeolite 4A or 3A.

Abstract: Techniques for producing a flexible structure attached to a device. One embodiment includes the steps of providing a first substrate, providing a second substrate with a releasably attached flexible structure, providing a bonding layer on at least one of the first substrate and the flexible structure, adjoining the first and second substrate such that the flexible structure is attached at the first substrate by means of the bonding layer, and detaching the second substrate in such a way that the flexible structure remains on the first substrate.

Abstract: One embodiment is directed towards a stabilized laser including a laser to produce light at a frequency and a resonator coupled to the laser such that the light from the laser circulates therethrough. The laser also includes Pound-Drever-Hall (PDH) feedback electronics configured to adjust the frequency of the light from the laser to reduce phase noise in response to light sensed at the reflection port of the resonator and transmission port feedback electronics configured to adjust the frequency of the light from the laser toward resonance of the resonator at the transmission port in response to the light sensed at the transmission port of the resonator, wherein the transmission port feedback electronics adjust the frequency at a rate at least ten times slower than the PDH feedback electronics.

Abstract: An optical filter performs filtering on input monitor light in a transmission range having a carrier frequency of each channel being measured as a center frequency. Photoelectric convertors convert the monitor light filtered by the optical filter into an electrical monitor signal, and the signal detection unit judges whether signal light is present or absent based on the electrical monitor signal. Since the optical filter performs filtering, an S/N ratio of the monitor light becomes great and the signal detection unit can more accurately judge whether signal light is present or absent even in an optically noisy environment.

Abstract: A method and apparatus are provided for determining apodization properties of a projection system in a lithographic apparatus. The method comprises allowing light from a given point in an illumination field to pass through the projection system along at least three different optical paths, and then determining the difference in the intensity of light received in a projection field from the two different optical paths, and calculating apodization properties of the projection system from the intensity difference. It is not necessary to know the intensity distribution in the illumination field. To provide the different optical paths a pinhole reticle provided with wedges of different orientations is used.

Abstract: An optical device, a method of configuring an optical device, and a method of using a fiber Bragg grating is provided. The optical device includes a fiber Bragg grating, a narrowband optical source, and at least one optical detector. The fiber Bragg grating has a power transmission spectrum as a function of wavelength with one or more resonance peaks, each comprising a local maximum and two non-zero-slope regions with the local maximum therebetween. The light generated by the narrowband optical source has a wavelength at a non-zero-slope region of a resonance peak that is selected such that one or more of the following quantities, evaluated at the resonance peak, is at a maximum value: (a) the product of the group delay spectrum and the power transmission spectrum and (b) the product of the group delay spectrum and one minus the power reflection spectrum.

Abstract: Proposed is a light sensor (1), comprising at least one wavelength selective photo-detector (10), a lens (20) and an aperture (30).The wavelength selective photo-detector allows detecting light within a predefined wavelength range falling on the sensor. The lens project light on the photo-detector and the aperture defines a field of view of the light sensor. The photo-detector (10), the lens (20), and the aperture (30) are arranged in a telecentric configuration. Advantageously, this allows light to impinge on the wavelength selective photo-detector within a predefined range of angles irrespective of the direction of the light incident on the aperture, thus removing the angle dependent response of the wavelength selective photo-detector.

Abstract: A device includes a female connector to receive a male network connector of a network conduit, and a first male connector optically communicating with the female connector, where the first male connector includes a first indicator that identifies a first wavelength optical signal. The device also includes a second male connector optically communicating with the female connector, where the second male connector includes a second indicator that identifies a second wavelength optical signal. The device further includes a wavelength splitter to receive an optical signal from the network conduit via the female connector, provide the optical signal to the first male connector when the optical signal corresponds to the first wavelength optical signal, and provide the optical signal to the second male connector when the optical signal corresponds to the second wavelength optical signal.

Abstract: Even in the case of a sample exhibiting low photoresponse, such as a wide bandgap semiconductor, a measurement method which enables highly accurate CPM measurement is provided. When CPM measurement is performed, photoexcited carriers which are generated by light irradiation of a sample exhibiting low photoresponse such as a wide bandgap semiconductor are instantly removed by application of positive bias voltage to a third electrode which is provided in the sample in addition to two electrodes used for measurement. When the photoexcited carriers are removed, even in the case of the sample exhibiting low photoresponse, the controllability of a photocurrent value is improved and CPM measurement can be performed accurately.

Abstract: An optical property measurement apparatus includes: a main body which includes a plane-shape surface that is so disposed as to face the display portion; an optical sensor which receives light directed from an opening that is formed through the plane-shape surface; and a support portion which is disposed on a side of the plane-shape surface and keeps a constant distance between the display portion and the plane-shape surface; wherein a light shield portion that is so disposed as to enclose a circumferential area of the opening of the plane-shape surface and shields entrance of light from a region other than a measurement target region of the display portion when the optical property is measured.

Abstract: An optical filter performs filtering on input monitor light in a transmission range having a carrier frequency of each channel being measured as a center frequency. Photoelectric convertors convert the monitor light filtered by the optical filter into an electrical monitor signal, and the signal detection unit judges whether signal light is present or absent based on the electrical monitor signal. Since the optical filter performs filtering, an S/N ratio of the monitor light becomes great and the signal detection unit can more accurately judge whether signal light is present or absent even in an optically noisy environment.

Abstract: The present invention relates to a front plate for a display comprising: a glass substrate having a first surface and a second surface; and a ceramic layer formed on at least a part of a marginal area of the second surface, wherein the front plate has a difference (?T) between a maximum light amount Tmax and a minimum light amount Tmin of transmitted light of 0.

Abstract: A photosensitive chip, including: at least one set of photosensors substantially aligned in a Y direction; and a layer of non-transmissive material including a plurality of openings. Each opening in the plurality of openings includes a respective center line and overlaps only a portion of a respective photosensor so that only the portion of the respective photosensor is photosensitive. The respective center lines for openings for each set of photosensors are not collinear in the Y direction. In an example embodiment, the plurality of openings includes at least one row of openings substantially aligned in an X direction, orthogonal to the Y direction. In an example embodiment, each opening has an equal width in an X direction, orthogonal to the Y direction.

Abstract: Proposed is a light sensor (1), comprising at least one wavelength selective photo-detector (10), a lens (20) and an aperture (30).The wavelength selective photo-detector allows detecting light within a predefined wavelength range falling on the sensor. The lens project light on the photo-detector and the aperture defines a field of view of the light sensor. The photo-detector (10), the lens (20), and the aperture (30) are arranged in a telecentric configuration. Advantageously, this allows light to impinge on the wavelength selective photo-detector within a predefined range of angles irrespective of the direction of the light incident on the aperture, thus removing the angle dependent response of the wavelength selective photo-detector.

Abstract: An optical measurement system includes a rotating element ellipsometer comprising a radiant source and a rotating optical element coupled to the radian source, an optical system to provide a modulated pump beam, a detection system optically coupled to the ellipsometer and a signal analyzer. The rotating element ellipsometer is configured to deliver a probe beam to a measurement spot on a sample and to measure one or more ellipsometric parameters of the sample at one or more discrete wavelengths or wavelength ranges, or a plurality of wavelengths across a wavelength range. Methods for determining sample characteristics from radiation scattered, reflected, diffracted or otherwise emitted from a sample surface using the optical measurement systems are also disclosed.

Abstract: An optical property measurement apparatus includes: a main body which includes a plane-shape surface that is so disposed as to face the display portion; an optical sensor which receives light directed from an opening that is formed through the plane-shape surface; and a support portion which is disposed on a side of the plane-shape surface and keeps a constant distance between the display portion and the plane-shape surface; wherein a light shield portion that is so disposed as to enclose a circumferential area of the opening of the plane-shape surface and shields entrance of light from a region other than a measurement target region of the display portion when the optical property is measured.

Abstract: Provided is a tester for testing an optical detector. The tester includes a plurality of light emitting units which emit light beams to the optical detector, wherein the light beams have light intensities different from each other, and a power supply unit which supplies electric power to the plurality of light emitting units.

Abstract: A monitoring device includes a first aperture plate, a second aperture plate, and a photodiode. The first aperture is disposed in a light path of a light beam emitted by a light source and includes a first aperture arranged such that a portion of the light beam having maximum light intensity passes and a reflecting portion that reflects the light beam as a monitoring light beam. The second aperture plate is disposed in a light path of the monitoring light beam and includes a second aperture that shapes a beam diameter of the monitoring light beam. The photodiode receives the monitoring light beam.

Abstract: The present invention relates to a light wavelength and intensity measuring device. The device automatically measures a center wavelength of the light source and an intensity of the light corresponding to the center wavelength by using a main photodetector, at least one optical filter, and at least one sub photodetector when the light source is connected to the device. The main photodetector detects the intensity of the light applied by the light source, the optical filter transmits the light corresponding to a prediscriminated transmission wavelength, and the sub photodetector detects the intensity of the light transmitted through the optical filter. Therefore, the light intensity is more accurately measured by calibrating the intensity according to the wavelength.

Abstract: Fuel injectors (10) for internal combustion engines are modified and equipped with fiber optic fuel pressure sensors (12) and fiber optic combustion pressure sensors (14). The combustion pressure sensors (14) are located in separate channels (26) formed in the fuel injectors with the lower portion (22) of the channels leading to the combustion chambers. Above the combustion pressure sensors (14) are fiber optic leads (24). In the preferred embodiments the sensors (46) are equipped with diaphragms (40) of novel shape (48) and employ multiple pairs of fibers (86, 88), temperature sensitive components (72, 74, 126) and novel compensation and status monitoring circuits (FIGS. 6, 9, 10, 14, 15, 18).

Abstract: An image sensor which may maximize the optical integrity by maximizing the amount of incident light through a microlens layer and a method for manufacturing an image sensor. An image sensor may include a pixel region, a microlens layer, and at least one microlens. The microlens layer may include a plurality of microlenses on the pixel region. At least one microlens has a shape different from the rest of the microlenses.

Abstract: A sunlight measuring device that quantifies the accumulation of light at a particular site. The sunlight measuring device is a battery-operated device mounted on a stake for easy insertion into the ground. The device is placed at the intended site for growing a plant. The light that falls on the sunlight measuring device over a period of time is accumulated and the light accumulation is represented by a visual signal that indicates one of four light conditions: full sun, partial sun, partial shade, full shade.

Abstract: The present invention relates to interfacing new sensors to incumbent controls. In particular, it relates to optically interfacing a new sensor, such as a spectrometer with plasma generator, to an incumbent electro-optical sensor. Logic and resources to control activation of the incumbent electro-optical sensor may be included. Particular aspects of the present invention are described in the claims, specification and drawings.

Abstract: A colorimeter for measuring a color of light includes a color sensing device, a hanging means, and a means for reducing color distortion. The hanging means hangs the color sensing device in an operative relationship relative to a color producing device. The means for reducing color distortion reduces color distortion on the color producing device While the color sensing device is in the operative relationship relative to the color producing device.

Abstract: A motor vehicle optoelectronic monitoring device includes a sensor, imaging systems, a shutter, and a controller. Each sensor element outputs a sensor element signal based on the intensity of a light signal received by the sensor element. Each imaging system is associated with a sensor region and illuminates an object to monitor the object. Two sensor regions associated with two respective imaging systems partially overlap one another. Each imaging system illuminates the sensor elements of the associated sensor region with a light signal indicative of the object being monitored. The controller controls the shutter unit to selectively enable and disable illumination of the sensor by the imaging systems. The controller processes the sensor element electric signals output by the sensor elements in response to illumination by an imaging system to determine conditions of the object being monitored by the imaging system.

Abstract: An automatically testable obscuration detector incorporates one of an electrically controllable filter or a mechanically selected filter. Filtered outputs can be compared to expected outputs by control circuitry to automatically assess detector operation.

Abstract: A colorimeter for measuring a color of light includes a color sensing device, a hanging means, and a means for reducing color distortion. The hanging means hangs the color sensing device in an operative relationship relative to a color producing device. The means for reducing color distortion reduces color distortion on the color producing device while the color sensing device is in the operative relationship relative to the color producing device.

Abstract: An optical test system (10) for testing one or more detectors includes a signal generator (12) operable to generate an optical signal. The test system (10) also includes an aperture system (16) operable to regulate an intensity of the optical signal. The test system (10) further includes a signal distributor (20) coupled to the aperture system (16) and operable to distribute the optical signal to a plurality of optical connections (22). Each optical connection (22) is coupled to a detector.

Abstract: In a light measuring apparatus, pulse-like measuring light is received by n photoelectric converting means and electric signals responsive to received light intensities are outputted therefrom. Time constant converting circuits elongate each of the electric signals in the direction of a time axis and outputs elongated electric signals. The respective levels of the elongated electric signals are detected at times different in width in the direction of the time axis. At this time, the timings with which the levels of n elongated electric signals are detected are shifted from each other. By using the result of detection, the respective integral values of the n elongated electric signals can be calculated without using integrating circuits. This reduces the number of components and the size and cost of a device.

Abstract: An optical test system for use in testing fiber optical transmission systems and components comprises a modular construction in a single housing. The modular construction includes a plurality of laser source channels, a MUX, additional optical conditioning devices both upstream and downstream of the MUX, and a master controller for operating the system components in synchrony. The integral housing, together with the modular construction, provides increased structural density that occupies in many instances at least seventy percent less space than is required for other optical test systems. The use of a master controller to drive the system affords expanded system functionality.

Abstract: An object recognition system comprises at least two image sensors and a controller that is adapted for measuring the distance from the system to a physical object with respect to respective windows of an image captured by the sensors. The controller is further programmed to form clusters by uniting adjacent windows that have similar measured distances. The controller is programmed to judge whether each of the clusters is valid or invalid based on the attributes of the cluster, and to recognize an object based on the clusters judged to be valid. In one embodiment, the attributes of the cluster is an area of the cluster. The controller calculates the area of the cluster based on the number of windows contained in the cluster and measured distance of each of the windows, and judges that the cluster is valid if the area is larger than a predetermined threshold value. The controller detects any failed state of the captured image based on the number of clusters judged to be invalid.

Abstract: To generate a high-contrast image of powder particles located on the surface of a print product, a measurement apparatus has an illumination unit which generates a measurement light beam which strikes the surface of the print product at glancing incidence. A measurement optics has an axis vertical to the surface of the print product and a diaphragm body is arranged in its focal point on the image side. The measurement optics forms an image of a surface region of the dusted print product on an image converter. An electronic evaluation unit determines the number and size of the powder particles from the image obtained on the image converter.

Abstract: A photodetection system that analyzes a luminous flux (15) received on a line (10). The photodetection system includes an opaque mask (4) provided with at least one aperture (6), placed in the vicinity of the line, driver (7) designed to rotate the mask, detector (8, 9) of an angular position of reference of the mask, a field lens (12) concentrating the luminous flux (16) crossing the line onto a photodetector (1), and a processing unit (3) connected to the photodetector, for analyzing the luminous flux to yield values for several points on the line.

Abstract: An optical output detector suitable for detecting the output of a laser diode for emitting light in a constant direction. The front emitted light generated from the laser diode as a light emitter is partially detected by a transmitting and diffracting unit, and the light intensity of the light emitter can be constantly maintained by detecting the light, thereby simplifying the manufacturing process and reducing the cost. Also, optical data can be stably processed by enhanced efficiency of the laser diode.

Abstract: Optical measuring apparatus for determining chromaticity of thin films on a substrate includes a light source for illuminating the substrate and a measuring apparatus for dispersing light into various wavelengths and making wavelength dependent intensity measurements. Radiation from the light source is reflected or transmitted by the substrate to the measuring apparatus along a first beam path having a first diaphragm for cutting off the radiation from the substrate in a leak-tight manner. Radiation from the light source is also transmitted to the measuring apparatus directly along a second beam path having a second diaphragm for cutting off radiation from the light source in a leak-tight manner. The light source (6a) consists of a globe photometer (6a), in which a lamp (4) is provided. A steadily burning light source, especially a halogen lamp, is used as the lamp (4).

Abstract: An air conditioning apparatus for a vehicle includes a first sunlight sensor disposed in a driver's seat side and a second sunlight sensor disposed in a passenger seat side space. The sunlight sensors are integrally formed with a filter and a Fresnel lens. When an elevation angle of sunlight is low, an inadequate correction of sunlight amounts is prevented by the Fresnel lens. Further, when sunlight enters the vehicle from the side, detected sunlight amounts detected by the first and second sunlight sensors are corrected so that a ratio or a difference between the detected sunlight amounts becomes large when the ratio or the difference is in a predetermined range. Therefore, when sunlight enters from the side, the correction of the detected sunlight amounts can be performed adequately so that passengers in the passenger compartment of the vehicle feel comfortable.

Abstract: The object of the invention is to offer an optical fiber sensor for measuring pressure or displacement having a simple, compact and light-weight structure, which is capable of performing high-precision range, displacement and pressure measurements over a wide range of temperatures. The optical fiber sensor has a drive control circuit 2 which controls a laser diode 1 to emit a laser beam, which is then split by an optical fiber coupler 4. An optical fiber coupler 7 directs one portion of the split laser beam to an optical fiber 10, and the other portion to an optical fiber 16. A portion of the laser beam propagating through the optical fiber 10 is reflected at the end surface 10a of the optical fiber 10 as a reference beam, while the rest of the laser beam is reflected at a peripheral portion of a diaphragm 12 to be incident upon the end surface 10a as a reflected beam. The two beams form an interference beam which is then split by the optical fiber couple.sub.r 7.

Abstract: An illumination measuring device for panoramic picture taking has a first photoelectric illumination intensity receiver which diffusely determines light falling in a first measuring region and illuminating a first panoramic portion, at least one further photoelectric illumination intensity receiver which diffusely determines light falling in a second measuring region and illuminating a further panoramic portion, and an evaluating unit determining a deviation of an illumination intensity determined by the further illumination intensity receiver from an illumination intensity determined by the first illumination intensity receiver.

Abstract: A scanning spot (54) moves over a pair of masks (50, 58) provided with respective arrays of transverse slits (52) of varying widths along the path of the spot or of transverse windows (60) at varying positions along a line (62) at an angle (.alpha.) to the path. Pulses of light passing through the slits and windows are detected (56.sub.W, 56.sub.L) and corresponding signals compared (102, 122) to predetermined values to produce digital pulses which are directed to counters (92, 94) to provide digital displays (126, 128) of spot width and length. Corresponding analog signals also may be provided (130-136).

Abstract: A photometering apparatus for measuring the brightness of an object to be photographed, includes a condenser lens having at least one aspheric lens surface for condensing a bundle of rays reflected from the object. A diaphragm is provided at a predetermined distance behind the condenser lens with respect to the object, and a split type light receiving device is provided behind the diaphragm to receive light which passes through the diaphragm. These elements satisfy the condition represented by the formula 0.3.ltoreq.L.sub.ASP /T.sub.L .ltoreq.0.7, wherein "T" represents the distance between the surface of the condenser lens nearer to the object to be photographed and the light receiving device, and wherein "L.sub.ASP " represents the reduced distance between the aspheric surface of the condenser lens and the diaphragm. The term "L.sub.ASP " is defined by the relationship L.sub.ASP =(d.sub.L /N)+d.sub.s, wherein "d.sub.L " represents the thickness of the lens, "d.sub.

Abstract: A method and device for measurement of exposure times in optical devices are disclosed. Specifically, a measuring diaphragm plate and a mask plate are associated with a measurement path and a projection path of the optical device and include a plurality of corresponding measuring diaphragms and masks, respectively. A graticule having markings corresponding to the contours of the measuring diaphragms is provided in the projection path proximate the mask plate and conjugate to an intermediate image plane, and a motor for selectively positioning a measuring diaphragm on the measuring path is synchronized with a motor for positioning a corresponding mask on the projection path, such that a selected measuring diaphragm and its corresponding contour markings are simultaneously imaged at the intermediate image plane.