| Patents for G01J 1 - Photometry, e.g. photographic exposure meter (22,989) |
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| 04/11/1991 | DE4031690A1 Optical fibre coupling for transmission of laser light - has sensors incorporated in coupling cuff detecting transmitted light level |
| 04/11/1991 | DE4031689A1 Anordnung zur leistungsmessung von optischer strahlung Arrangement for power measurements of optical radiation |
| 04/10/1991 | EP0421304A1 Infrared ray detector |
| 04/10/1991 | EP0421135A2 Method and process for determining the position and diameter of a laser beam focus, used for workpieces machining with a high power laser |
| 04/10/1991 | CN2074907U Microlight testing device |
| 04/09/1991 | US5006712 For fluctuations in radiation |
| 04/04/1991 | WO1991004469A1 An ultraviolet radiation dosimeter |
| 04/03/1991 | EP0419583A1 Improvements in and relating to pyroelectric detectors |
| 04/03/1991 | EP0419525A1 Apparatus for measuring the radiated power of lasers. |
| 04/03/1991 | CN1012283B Detective device and technique of ultra-weak light |
| 04/03/1991 | CN1012282B Light pressure measurement method for laser beam energy and apparatus there of |
| 04/02/1991 | US5005045 Reprographic camera system |
| 04/02/1991 | US5004907 Circuit for determining power of received light having superimposition of low frequency current |
| 04/02/1991 | US5004904 Method and system for controlling gain and offset in radiation measurement apparatus |
| 04/02/1991 | US5004890 Method of evaluating quality of a laser beam in a laser processing machine |
| 04/02/1991 | US5004338 Method and apparatus for attenuation and measurement of laser power at the end of a laser guide |
| 03/27/1991 | EP0419029A2 A multiple parallel channel rotary optical coupler |
| 03/27/1991 | CN2074014U Luminous flux accumulating instrument |
| 03/26/1991 | US5003268 Optical signal sampling apparatus |
| 03/26/1991 | US5002347 Stepped thickness spectral filter for focal plane flattening |
| 03/21/1991 | WO1991003725A1 Combined optical train for laser spectroscopy |
| 03/20/1991 | EP0418202A2 Optical sensor with intermodal interferometry |
| 03/20/1991 | EP0418073A2 Infrared detectors |
| 03/20/1991 | EP0417846A2 Pyroelectric and other thermalradiation detectors with film element(s) |
| 03/20/1991 | EP0417551A2 Photoreflectance method and apparatus utilizing acousto-optic modulation |
| 03/20/1991 | EP0417541A2 Process of preparing a protein-oriented membrane |
| 03/20/1991 | EP0387291A4 Apparatus and method for use in pulse oximeters |
| 03/20/1991 | CN1050089A Optical-path arrangement for fluorescence testing and relevant equipment |
| 03/19/1991 | US5001650 Method and apparatus for search and tracking |
| 03/19/1991 | US5001558 Night vision system with color video camera |
| 03/19/1991 | US5001348 Method and apparatus for recognizing the start and motion of objects |
| 03/14/1991 | WO1991004617A1 An optical detector |
| 03/13/1991 | EP0416647A2 Optical interconnection apparatus |
| 03/13/1991 | CN2073111U Lightness tester made of optical-sensing crystal shutter tube |
| 03/12/1991 | US4999548 Picture analyser tube with streak compensation |
| 03/12/1991 | US4998826 Agricultural infrared thermometer |
| 03/12/1991 | US4998688 Operating temperature hybridizing for focal plane arrays |
| 03/07/1991 | WO1991002955A1 Shade distinguishing device |
| 03/07/1991 | WO1991002954A1 Varied space diffraction grating and in-focus monochromator |
| 03/06/1991 | EP0415440A2 Apparatus for measuring light output from semiconductor light emitting element |
| 03/06/1991 | EP0415241A2 Durable infrared target having fast response time |
| 03/06/1991 | EP0414831A1 A dielectric bolometer. |
| 03/06/1991 | CN2072680U Miniature illuminance monitor |
| 03/05/1991 | WO1991003756A1 Remote end detection |
| 03/05/1991 | US4998043 LED stabilizing light source device |
| 03/05/1991 | US4998018 Two-wavelength type respiratory gas concentration measuring apparatus |
| 03/05/1991 | US4998011 Flat plate focus sensing apparatus |
| 03/02/1991 | WO1991003204A1 Shutterless optically stabilized capnograph |
| 03/02/1991 | CA2064892A1 Shutterless optically stabilized capnograph |
| 03/01/1991 | CA2020454A1 Durable infrared target having fast response time |
| 02/27/1991 | EP0414109A2 Apparatus for reducing lag in photosensors |
| 02/27/1991 | EP0322454B1 Analog-digital correlator |
| 02/27/1991 | EP0294367B1 Device for detecting the radial distribution of the radial intensity distribution of a laser beam |
| 02/26/1991 | US4996677 Multichannel magnetic and optical linear head |
| 02/26/1991 | US4996431 Selective gas detecting apparatus |
| 02/26/1991 | US4996428 Thermal imaging device |
| 02/26/1991 | US4996416 Optical detection system with means for equalizing ambient light levels at multiple detectors |
| 02/26/1991 | US4995724 Optical spectrum analyzer with high performance measurement function |
| 02/21/1991 | DE3926881A1 impulse-based spectral photometer for rapid cell changes - induced by light using polychromatic beam formed in photo-cable from multiple sources |
| 02/19/1991 | US4994876 Light detecting element and light detecting array |
| 02/19/1991 | US4994845 Light measuring device |
| 02/19/1991 | US4994663 Light intensity correlating apparatus |
| 02/19/1991 | US4993834 Spectrometer for the simultaneous measurement of intensity in various spectral regions |
| 02/19/1991 | US4993424 Infrared medical thermometer |
| 02/13/1991 | CN2071334U Lead zirconium titanate heat discharge laser power meter |
| 02/12/1991 | US4992963 For dividing light |
| 02/12/1991 | US4991934 Varied space diffraction grating and in-focus monochromator |
| 02/12/1991 | CA1280196C Avanlanche photodiode |
| 02/06/1991 | EP0411907A2 Scattered total internal reflectance apparatus |
| 02/06/1991 | EP0411800A2 Method for determining aperture shape |
| 02/06/1991 | EP0411557A2 Photometric method and device for the analysis of samples treated with fluorescent reagents |
| 02/06/1991 | EP0411373A2 Frequency domain integrating resonant superconducting transmission line detector |
| 02/06/1991 | CN2070904U Light detector |
| 02/05/1991 | US4990782 Radiation shield for thermoelectrically cooled infrared detectors |
| 02/05/1991 | US4990762 Laser beam phase measurement and control system |
| 02/05/1991 | US4990761 Plural arc radiation protector |
| 02/05/1991 | US4989982 Spectral sensitivity correcting device in a photoelectric tristimulus colorimeter |
| 02/05/1991 | US4989972 Low reflectivity surface relief gratings for photodetectors |
| 02/02/1991 | CA2022292A1 Scattered total internal reflectance apparatus |
| 01/30/1991 | EP0410745A1 Reflective chopper for infrared imaging systems |
| 01/30/1991 | EP0410160A2 Optical filter |
| 01/29/1991 | WO1991002268A1 Electrical switching system |
| 01/29/1991 | US4989198 Beam control device utilizing beam having a specific direction of polarization to control a laser used in an optical memory system |
| 01/29/1991 | US4988861 Device for measuring the energy of an electric arc |
| 01/29/1991 | US4988859 Optical waveform measuring device |
| 01/29/1991 | US4988199 Method and apparatus for measuring the concentration of optically active substances |
| 01/29/1991 | CA2053314A1 Electrical switching system |
| 01/23/1991 | EP0409271A2 Method and apparatus for determining a material's characteristics by photoreflectance using improved computer control |
| 01/22/1991 | US4987294 Optical sensor with plual detectors and pulse sandwiching |
| 01/22/1991 | US4986657 Apparatus for analyzing particles using scattered and fluorescent light |
| 01/22/1991 | CA1279372C Non-electronic gain control |
| 01/17/1991 | DE3922153A1 Optical sensor with electro=optical converter and lens - uses low-dispersion property of aspherical lens whose two ellipsoidal faces have major semi-axes orthogonal |
| 01/16/1991 | EP0407520A1 Luminosity detector for internal combustion engine |
| 01/16/1991 | EP0407429A1 Fluid pollution monitor |
| 01/15/1991 | US4985622 Method for determining the corrosion resistance of deep-drawable iron sheets for body parts of motor vehicles and apparatus for performing the method |
| 01/09/1991 | EP0407166A2 Light detecting device and light detection method |
| 01/09/1991 | EP0406968A1 Device for measuring light scattered by an information support |
| 01/08/1991 | US4984007 Exposure control apparatus for camera |
| 01/08/1991 | US4983838 Pyroelectric element |
| 01/08/1991 | US4983821 Photomultiplier tube with electrode supports |