Abstract: A three terminal solid-state ionizing radiation detector (10) includes a first layer (18) of a substantially intrinsic Group II-VI compound semiconductor material, such as CdZnTe. The first layer is responsive to incident ionizing radiation for generating electron-hole pairs. The detector further includes a second layer (24) of Group II-VI compound semiconductor material and a third layer (20) of Group II-VI compound semiconductor material that is interposed between first surfaces of the first layer and the second layer. The third layer functions as a grid layer. A first electrical contact (12, 17) is coupled to a second surface of the first layer, a second electrical contact (29, 30) is coupled to a second surface of the second layer, and a third electrical contact (22) is coupled to the third layer for connecting the detector to an external circuit that establishes an electric field across the detector.

Abstract: A scintillation camera having a detector with a surface and designed to form a tomographic image of a subject from radiation emitted from radio isotope administered to the subject and detected by the detector. The camera comprises a data acquiring device for acquiring data required to reconstruct a tomographic image of the subject, and a detector holder for holding the detector at a predetermined distance from the body surface of the subject while the data acquiring device is acquiring the data. The detector holder includes a sensor, which may for example be an ultrasonic sensor, a pressure sensor, a tension sensor or an optical sensor, located between the subject and the detection surface of the detector, a sensor control circuit for controlling the sensor and detecting ON/OFF state of the sensor, and a detector moving device for moving the detector toward and away from the subject in accordance with the ON/OFF state detected by the sensor control circuit.

Abstract: An improved optical inspection system for detecting flaws on a diffractive surface containing surface patterns includes: an ultraviolet illumination means for illuminating a region on the diffractive surface to generate a scattered intensity distribution in response to either a flaw or a surface pattern; means for detecting the intensity level of the scattered intensity distribution at a plurality of locations about the diffractive surface; means for establishing a minimum detected intensity level; means, responsive to the minimum detected intensity level, for indicating the absence of a flaw on the illuminated region of the diffractive surface when the minimum detected intensity level is below a threshold intensity level and for indicating the presence of a flaw on the illuminated region of the diffractive surface when the minimum detected intensity level exceeds the threshold intensity level; and means for moving the diffractive surface to generate a scan pattern on the diffractive surface to inspect the en

Abstract: A device for detecting infrared radiation which comprises a sensitive arm which, over at least a portion of its length, consists of bimetal. One end of said arm is joined to a membrane.

Abstract: A thermal imaging device (10) includes a detector (50) having a linearly-arrayed plurality of spaced apart detector elements (50') upon which portions of a viewed scene are sequentially scanned by a scanner (22) in order to capture image information from the scene. A display device (22, 62, 66) similarly includes a first linear array of plural spaced apart light emitting diodes (LEDs) (62') which provide light scanned by the same scanner (22) to a user of the thermal imaging device (10) to provide an image replicating the viewed scene. The LEDs (62') of the display (22, 62, 66) are configured so that sequential portions of the image are interlaced and partially overlapped by the scanner (22) to provide a flat visual field which is free of raster lines.

Abstract: The present invention provides a photographic lens system capable of close-up photography in which various aberrations such as spherical aberration and coma, and curvature of field are concurrently corrected in a well-balanced state and which is relatively bright as expressed by an F-number of about 2.8, and is characterized by comprising a first lens group G.sub.1 which includes a front sub-group G.sub.1F having positive refracting power and a rear sub-group G.sub.1R having negative refracting power and has positive refracting power in its entirety, a second lens group G.sub.2 having positive refracting power in its entirety, and a third lens group G.sub.3 having positive refracting power in its entirety, the lens of the front sub-group G.sub.1F nearest to the image side being concave on the image side and the lens of the rear sub-group G.sub.

Abstract: A method of and apparatus for detecting the presence of fecal or ingesta matter contaminants on a poultry or meat item. The poultry or meat is conveyed in front of a UV light transmitter/receiver where UV light is directed onto the poultry or meat item and subsequently light is gathered from the poultry or meat. The gathered light is then compared to a threshold, above which indicates contaminants. If contaminants are present, the controller can generate a signal and/or send the contaminated items to a wash station.

Abstract: The invention is a system for controlling the operation of a dome in connection with a telescope in order to maintain the slot of the dome in alignment with the telescope at all times so that stars may be viewed continuously. The system eliminates of minimizes the need for the user having to manually control the operation, usually rotation, of the dome. Preferably four infrared sensors and transmitters are mounted along the circumference of the telescope in order to send signals to a controller when the edge of the dome is detected which occurs when the signal is reflected back to the sensor. Each of the sensors should be 90.degree. in relation to each other. Each of the sensors is in connection with a controller. The controller is in connection with the movement system of the dome and sends signals to the movement system that rotate the dome until the sensors determine that the dome slot is aligned with the telescope.

Abstract: A device is provided for the detection of infrared radiation which operates at low temperature. The device contains a detection unit and a cryostat equipped with a cold finger to exchange heat with a cold source. Included is a cold plane having at least one machined portion, each portion having a recess toward the center of the cold plane in the region of a through-slot opening outside the cold finger. A connection element is positioned by insertion into each recess, and is electrically connected to the connector of the cryostat.

Abstract: A method and apparatus for determining and adjusting the polymer content of a cellulose/polymer blend prior to use in a paper-making machine. The method for evaluating a desired polymer contained in a cellulose/polymer mixture comprising the steps of acquiring a sample for evaluation from a cellulose/polymer mixture, dewatering the sample, shredding the dewatered sample, evaluating the shredded sample over the range of absorptances which correspond to the absorption characteristics of the desired polymer, determining a specific wavelength within the range which corresponds to a location of maximum absorbence and of low sensitivity with respect to spectral shifts, comparing the specific wavelength determined with standardized wavelengths representative of known polymer percentages, and determining the polymer content by selecting the standardized wavelength which best corresponds to the specific wavelength determined.

Abstract: An atomic absorption spectrometer for measuring mercury concentration in a sample which includes an arrangement for producing emission lines of 184.9 and 253.7 nm at the same time, a sample accommodating chamber which can be irradiated with radiation of the emission lines, two electro-optical transducers responsive, with different sensitivities, to the radiation emission lines and arranged so that radiation passing through the sample chamber simultaneously impinges thereon, each extinction measuring means having a preselected extinction value range, and a comparator for switching between respective measurement ranges to determine the mercury concentration.

Abstract: A scintillator crystal (22) for a diagnostic device (10) has a reflective surface which is dynamically adjustable. Radiation (42) from a diagnostic scan enters a detector (14a, 14b, 14c) and strikes the scintillator crystal (22). The scintillator crystal (22) converts the radiation into a plurality of scintillations or light photons (26) which travel in all directions. A plurality of photomultiplier tubes (30) are optically coupled to an optically transmissive plate (28) which is optically coupled to an exit surface of the scintillator crystal. The entrance surface of the scintillator crystal is polished and laminated with a liquid crystal layer (54). The liquid crystal layer has light dispersion and reflectivity properties which are dynamically adjustable in response to electrical (62) or chemical stimuli.

Abstract: Gas analyzer systems which include: (1) a transducer for outputting a signal indicative of the concentration of a specified gas in a sample which may contain that gas, and (2) an airway adapter or cuvette with a flow passage for confining the sample to a particular path traversing the transducer. The cuvettes feature radiant energy transmitting windows which are flush mounted in apertures on opposite sides of the cuvette flow passage and are fabricated from a polymer such as biaxially oriented polypropylene which is malleable, yet resistant to wrinkling, warping, and other forms of distortion. Retainer rings keep the windows flat and distortion free with an accurately reproducible spacing between the windows.

Abstract: A thermal imaging device (10) includes a rotational scanning mirror (32) scanning a viewed scene across a linear detector array (50) including plural spaced apart detector elements (50', 50", 50'", . . . ). The scanner includes an annular magnetic track (174) carried on the rotational scanning mirror (32), and a stationary reading head (178) responding to passage of magnetic domains (176) on the magnetic track (174) to commutate position of the rotational scanning mirror (32). The reading head (178) includes pairs of magneto-resistive elements (182) which are physically positioned relative to one another and are electrically connected so as to be simultaneously exposed to respective magnetic flux maxima and magnetic flux minima as the scanner mirror (32) rotates. As a result, domain-to-domain variations of flux intensity of the magnetic domains (176) on the magnetic track (174) are averaged out.

Abstract: Disclosed is an apparatus for automatically consolidating a filter or, more specifically, an apparatus for drawing a volume of gas through a plurality of sections of a filter, whereafter the sections are subsequently combined for the purpose of simultaneously interrogating the sections to detect the presence of a contaminant.

Abstract: A thermal imaging device (10) includes a light emitting diode (LED) display (62) providing an image replicating a viewed scene. The LED display (62) also includes an array of symbology LEDs (198) providing symbology superimposed on the image of the viewed scene. A video driver circuit (214) and a symbology driver circuit (202) are time-sequenced so that a reticle pattern or symbology provided by the symbology-LEDs (198) is superimposed at the desired location of the visible image provided by the scene-LEDs (62').

Abstract: The present invention provides a personal, portable and self-powered ultraviolet light intensity (UVI) monitor and a method for determining the duration of safe exposure to the sun or, alternatively, the value of the sun protection factor (SPF) of a sun protection product required for a given duration of exposure to the sun. The monitor is a substrate imprinted with indicia and non-uniformly overlaid with photosensitive material. Depending on the intensity of UV light to which the monitor is exposed, the photosensitive material changes physical characteristics and exposes some and conceals other indicia to indicate a duration of safe exposure to the sun for given conditions or the SPF value of the sun protection product used to be used, or both.

Abstract: A method for detecting tissue abnormality, particularly precancerous cervical tissue, through fluorescence spectroscopy is disclosed. In vitro fluorescence measurements over a variety of different fluorescence spectra are used to screen tissue samples. Using a principal component analysis (PCA), it is possible to discriminate between normal and dysplastic tissues with relatively low false-positive and false-negative results.

Abstract: An ultraviolet radiation monitoring kit comprising at least one first substrate and at least one second substrate, the second substrate being capable of being closely associated with at least one first substrate, the first substrate having an indicator area comprising a chromogenic composition, the chromogenic composition comprising (a) the colored reaction product of a chromogen and a color developer, the colored reaction product being capable of changing color when exposed to ultraviolet radiation, or (b) a substantially colorless mixture of a chromogen and a color developer capable of reacting to form color when exposed to ultraviolet radiation, the second substrate bearing a reference color chart, the reference color chart comprising at least one reference color corresponding to time exposure to ultraviolet radiation, such that comparison of the color developed by the chromogenic composition upon exposure to ultraviolet light with a reference color provides an indication of the time and degree of exposure

Abstract: A thin film sensor element includes a sensor holding substrate having an opening part and a multilayer film adhered thereon at least consisting of an electrode film A, an electrode film B having (100) plane orientation, and a piezoelectic dielectric oxide film present between the electrode film A and the electrode film B. As a result, a thin film sensor element which is small, light, highly accurate, and inexpensive can be attained which can be used for an acceleration sensor element and a pyroelectric infrared sensor element. On the surface of a flat plate KBr substrate, a rock-salt crystal structure oxide of a conductive NiO is formed by a plasma MOCVD method whose vertical direction is crystal-oriented to <100> direction against the substrate surface. By means of a sputtering method, a PZT film is formed by an epitaxial growth on that surface, and a Ni-Cr electrode film is formed thereon.