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| Number | Title | Issue Date |
| 7894050 | Method and apparatus for determining intensities and peak wavelengths of light The present invention provides a method and apparatus for determining intensities and peak wavelengths of light. The apparatus comprises one or more pairs of sensing units for sensing the light, a first sensing unit of a pair configured to sense a first intensity of... | 02/22/2011 |
| 7294842 | Camera head for fast reproduction of a vacuum UV spectrometer spectrum An apparatus for measuring the transport time of impurity particles in a plasma includes a spectrometer, a system for the spatially-resolving conversion into charge of light exiting the spectrometer, an integrator circuit for the spatially-resolving integration of t... | 11/13/2007 |
| 6236461 | Laser sensitometer using multiple-prism beam expansion and a polarizer An electro-optical apparatus particularly suitable for exposing a sample of light sensitive material to provide a graded series of exposures of different intensity levels. The apparatus includes a light source, beam shaping optics, and a rotatable polariz... | 05/22/2001 |
| 6204080 | Method for manufacturing thin film actuated mirror array in an optical projection system A method for manufacturing a thin film AMA is disclosed. The second sacrificial layer is formed by using amorphous silicon, poly silicon or a material having fluidity and the first sacrificial layer is formed by using amorphous silicon or poly silicon. Th... | 03/20/2001 |
| 6072573 | Portable laser power measuring apparatus Apparatus for measuring power in a laser-beam includes a transmissive diffuser for diffusely expanding the laser-beam and a photon detector for receiving the diffusely-expanded laser-beam and generating an electrical signal in response thereto. Electronic... | 06/06/2000 |
| 5880827 | Measurement System with large dynamic range A measurement circuit having high dynamic range includes high-gain and low-gain amplifiers connected in parallel. A shunt feedback circuit is activated to prevent the high-gain amplifier from saturating when the magnitude of an input signal exceeds its dy... | 03/09/1999 |
| 5805277 | Portable laser power measuring apparatus Apparatus for measuring power in a laser-beam includes a transmissive diffuser for diffusely expanding the laser-beam and a photon detector for receiving the diffusely-expanded laser-beam and generating an electrical signal in response thereto. Electronic... | 09/08/1998 |
| 5748302 | Optical power meter An optical power meter which is capable of performing power range switchover operations in short periods of time and are capable of performing optical power measurements over a wide range in short periods of time. The invention comprises a photodiode 101 ... | 05/05/1998 |
| 5610709 | Automatic ranging optical power monitoring system A high speed, automatic calibration system of laser (or other light source) sensitometers capable of a wide range of power measurements, of densitometers and of other optical power measuring systems, and particularly to an automatic gain scaling circuit f... | 03/11/1997 |
| 5602617 | Light metering device with adjustable output A light metering device incorporates a light dependent resistor as a light sensing element, a network including a plurality of circuit elements, and a selection mechanism for selectively connecting the light dependent resistor to one of the plurality of c... | 02/11/1997 |
| 5548398 | Illuminant discriminator providing detection of high efficiency illumination An illuminant discriminator distinguishes a range of separate illuminants, including high efficiency fluorescent lighting, by modifying the frequency response of a signal output from a photodetector. A switchable high pass filter coupled to the photodetec... | 08/20/1996 |
| 5491548 | Optical signal measurement instrument and wide dynamic range optical receiver for use therein A wide dynamic range optical receiver has low and high sensitivity signal channels for converting first and second portions of an optical input signal into voltage values representative of the various portions of the optical input signal. The voltage sign... | 02/13/1996 |
| 5422075 | Chemical luminescence-detecting apparatus with multiple sensors The present invention relates to a chemical luminescence-detecting apparatus that is provided with a plurality of optical detectors different in sensitivity in the vicinity of a photometric cell. A ratio of outputs from the optical detectors based on inte... | 06/06/1995 |
| 5400115 | Printer having a measuring unit adjustable to the spectral sensitivity of a copy material A printer has a light source and an objective which direct a light beam along a predetermined path, and a unit in the path for measuring the density of a master to be reproduced. The measuring unit includes a filter combination of at least two filters dow... | 03/21/1995 |
| 5083036 | Indicator circuit for a concentration measuring apparatus An indicator circuit is provided for an apparatus that measures the concentration of a selected component in a test sample. The apparatus generates a test voltage that represents the concentration of the component in the test sample. The circuit generates... | 01/21/1992 |
| 4886961 | Light detector having light sensor and light indicator, and control circuit thereof A light detector which indicates decrease in the level of ambient light below a prescribed value. The light detector includes a light indicator for radiating light when the level of ambient light decreases below the prescribed value, a light sensor arrang... | 12/12/1989 |
| 4847483 | Device for measuring light intensity received by a photosensor A device for measuring the intensity of light received by a photosensor comprises a photosensor for receiving light and producing a corresponding current and a circuit for integrating the current so that the intensity of the received light is indicated as... | 07/11/1989 |
| 4798950 | Radiation characteristic measuring apparatus for laser diode An apparatus for measuring a radiation characteristic of a laser diode. An AC signal and a step-like DC voltage are applied to the laser diode and the radiant power output thereof is received by a photodiode having an output to which a first amplifier, a ... | 01/17/1989 |
| 4749275 | Optical power meter with automatic switching of photodetectors having different wavelength sensitivity characteristics An optical power meter system comprises a chopper with a semicircular total reflection mirror along an incident light path, two photo-detectors of different characteristics of wavelength sensitivity, and a comparator for comparing the levels of the photo-... | 06/07/1988 |
| 4720628 | Optical process for determining the endpoint of a process via analog multiplication of photocell signals An improved optical endpoint detector is disclosed in which two photocells are used in conjunction with analog multipliers and variable voltage sources, all under microprocessor control. The combination enables one to measure the ratio of intensity of dif... | 01/19/1988 |
| 4666301 | Radiation responsive integrating amplifier Light induced current from a photodiode is converted into a voltage proportional to the integral with respect to time of the current using two serially connected integrating operational amplifiers. In each case the integrating capacitors are connected so ... | 05/19/1987 |
| 4652735 | Image reader for X-ray film or the like having a detection system with an expanded dynamic range An image reader having a high sensitive detection system for detecting a variation in a first light quantity to generate a first output, a low sensitive detection system for detecting a variation in a second light quantity to generate a second output wher... | 03/24/1987 |
| 4465370 | Light measuring device A light measuring device includes one or more photodiodes, which generate current in relation to the received light, and at least one capacitor for integrating the generated current. The amount of charge stored in the at least one capacitor at the complet... | 08/14/1984 |
| 4252441 | Arrangement for measuring exposure in photography with an electronic exposure meter and adapter An arrangement for measuring exposure in which an adapter is attached to an electronic exposure meter. The adapter has at least three plugs mating with corresponding sockets on the exposure meter. The exposure meter has a circuit supplying a measured volt... | 02/24/1981 |
| 4203668 | Digital exposure meter The meter senses flashes of illumination, it converts the illumination to an electrical current whose magnitude is proportional to the intensity of the illumination; it integrates the current over a period of time corresponding to a selected shutter speed... | 05/20/1980 |
| 4168125 | Light sensing device The sensing device is a light level indicator that comprises a light sensitive element such as a photo resistor, associated detection circuitry and "go" and "no go" indicator lights which determine whether the level of illumination is above or below a pre... | 09/18/1979 |
| 3999060 | Device for receiver for optical signals A device is provided for controlling the sensitivity of a receiver of the type comprising a photosensitive element operative to convert radiant energy into electric signals and having an amplifier connected to the output of the photosensitive element and ... | 12/21/1976 |
| 3990799 | Digital exposure meter In an exposure meter having a row of lighting elements, such as lamps or light-emitting diodes, which correspond to respective exposure values, an improvement is made in that by utilizing a capacitor-charging integrating circuit, a constant current circui... | 11/09/1976 |
| 3966325 | Laser power meter A laser power meter is described which enables the direct measurement of the output power of lasers over a full range of differing beam wavelengths. The laser power meter includes not only the photocell for intercepting a laser beam and the needle-scale m... | 06/29/1976 |
