Did You Know...
...that after Parker Brothers executives turned down the game of Monopoly because it had "52 fundamental errors" (including taking too long to play), a copy of the game wound up in the home of the company president who stayed up until 1 a.m. to finish playing it? He was so impressed by the game that the next day he wrote to inventor Charles Darrow and offered to buy it!
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| Number | Title | Issue Date |
| 5966210 | Apparatus for evaluating the performance characteristics of endoscopes In an apparatus for evaluating the performance characteristics of fiber optic endoscopes, a frame defines a carrier support, and an upstanding arm support mounted rearwardly of and adjacent to the carrier support. A plurality of targets are supported on a... | 10/12/1999 |
| 5959727 | System and method for discriminating between direct and reflected electromagnetic energy An energy beam threat discrimination system (110) adapted for use with laser beam energy (134). The system (110) includes an first detector (114) for detecting a first laser signal. A second detector (112) detects a coherent laser signal. A timer circuit ... | 09/28/1999 |
| 5936724 | Flicker photometer A flicker photometer has beam generating means (1, 8 and 4) for generating two beams of light of different colors. Light from the beams is viewed at the viewing means, and the intensity of light of one beam relative to that of the other beam can be adjust... | 08/10/1999 |
| 5910837 | Photomechanical transducer The invention relates to a photomechanical transducer which comprises a photochromic element made of a first material and attached on a carrier element made of a deformable second material. The first material of the photochromic element changes its molecu... | 06/08/1999 |
| 5859697 | Fiber optic noise suppressor A system for the measurement of high bandwidth peak power pulses from laser sources. A laser pulse from a laser is directed onto the surface of a diffuser that replicates the pulse. A linear array of fiber optics of varying fiber length transmits the repl... | 01/12/1999 |
| 5818599 | Apparatus and method for accelerated testing of materials An apparatus and method for the testing of materials by thermal oxidation is provided. The apparatus comprises a housing having at least one optic-isolated chamber. A photon counting photomultiplier and a heat source, for each optic-isolated chamber, are ... | 10/06/1998 |
| 5818597 | Projection system visual characteristics analyzer The present invention is a system and method to expeditiously and accurately measure the luminance, weave, jump and flicker of an object so that the best luminance available for that object may be achieved by making adjustments to the light source, the re... | 10/06/1998 |
| 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 |
| 5764352 | Process and apparatus for spectral reflectance and transmission measurements 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 ... | 06/09/1998 |
| 5736354 | Determination of toxicity There is disclosed a method of determining the toxicity of a fluid sample comprising the steps of: (i) mixing the sample with a suspension of light emitting organisms; (ii) monitoring the light output (E) of the mixture continually over a period of time (... | 04/07/1998 |
| 5731865 | Photometric system for a photographic printing apparatus A photometric system for a photographic printing apparatus having an exposure device for projecting light traveling from a light source (21) through a mirror tunnel (24), along a projection path through a photographic film (2) to printing paper (3). An op... | 03/24/1998 |
| 5716583 | Luminometer with reduced sample crosstalk A luminometer is described comprising a tray for receiving an array of sample wells, a photodetector assembly, and means for relatively moving the tray and photodetector assembly in one direction to align the sample wells received by the tray in a predete... | 02/10/1998 |
| 5715049 | Light measuring apparatus for quantifying photons When incident light is incident to a photodetector, photoelectrons are emitted therefrom and then multiplied to output an electric current signal. This current signal is integrated over a predetermined period of time in an integrator to be converted to a ... | 02/03/1998 |
| 5526451 | Photometric instrument with optical fibers for analyzing remote samples In a spectrophotometer, each of a plurality of source optical fibers is selectively receptive of source radiation and carries the radiation to a corresponding selected liquid sample cell. A corresponding return optical fiber returns transmitted radiation ... | 06/11/1996 |
| 5389544 | Method for counting living cells of microbes and apparatus therefor A method for counting living cells of microbes in a fluid sample continuously while flowing the sample using an apparatus which comprises a system for supplying at a predetermined rate to the flow line of the sample a reagent, such as, a derivative of flu... | 02/14/1995 |
| 5345305 | Aquarium light meter This invention relates to an aquarium light meter including a light sensing device, a pivotal assembly connecting the light sensing device to a pair of telescopic tubes, a controller, and a signal wire connected to the light sensing device and passing thr... | 09/06/1994 |
| 5335060 | Image intensity degradation tester A tester for image intensifier tubes used in night vision goggles used by aircraft crew members includes a photosensor, dc. power supply, lamp, optical filter, neutral density optical filters, feedback control, and columnating lens. The intensity of the l... | 08/02/1994 |
| 5261822 | Surgical refractive laser calibration device A phantom cornea for calibrating surgical lasers is formed by superimposition of thin-films of alternating colors. After ablation by a laser beam, the resulting spherical cavity appears as a pattern of nested circles whose concentricity and spacing reflec... | 11/16/1993 |
| 5093234 | Method of aligning, compensating, and calibrating a flow cytometer for analysis of samples, and microbead standards kit therefor A kit of highly uniform size microbead standards for flow cytometer alignment, compensation, and/or calibration, comprising a blank microbead population and/or an auto-fluorescent microbead population, together with two or more series of calibrated microb... | 03/03/1992 |
| 5048969 | Piezoelectric measurement of laser power A method for measuring the energy of individual laser pulses or a series of laser pulses by reading the output of a piezoelectric (PZ) transducer which has received a known fraction of the total laser pulse beam. An apparatus is disclosed that reduces the... | 09/17/1991 |
| 5048955 | Device for measuring color temperature A device for measuring color temperature, having at least one measuring diffuser and at least one indicator for the color temperature, as well as operating elements for turning the device on and off, for resetting the measured values, and for initiating a... | 09/17/1991 |
| 4998798 | Encoder having long length measuring stroke An encoder having a long length measuring stroke with a simple construction is provided. The encoder comprises a scale formed with a periodic lattice pattern, first and second reading heads arranged along a moving direction of the scale for reading the sc... | 03/12/1991 |
| 4772118 | Methods of and apparatus for measuring picosecond semiconductor laser pulse duration using the internally generated second harmonic emission accompanying the laser output The duration of a very short semiconductor laser pulse, such as that ranging from a fraction to hundreds to picoseconds, can be measured utilizing the internally generated second harmonic emission of the laser. A laser diode is driven so that light emitte... | 09/20/1988 |
| 4704030 | Electromagnetic radiation detectors A predetermined characteristic of a laser beam is detected by disposing a reflector (11) in the path of the beam and coupling an electromechanical transducer (12) to the reflector to detect a mechanical response of the reflector to the incident beam.... | 11/03/1987 |
| 4681436 | Femtosecond laser pulse measuring system A system for measuring laser pulse durations in the range of ten nanoseconds to one femtosecond to an accuracy of one femtosecond, includes a primary pulse sampler, a ten component beam splitter array, optical delay lines whose settings are microprocessor... | 07/21/1987 |
| 4636072 | Method and apparatus for improved photometric testing of high intensity discharge lamps and luminaires An improved method and apparatus for use in photometric testing of high intensity discharge lamps and luminaires is disclosed. The improved apparatus includes the creation of a mock high intensity discharge lamp having an incandescent emitting element rep... | 01/13/1987 |
| 4548496 | Non-obstructing laser beam sampling meter A non-obstructing laser beam sampling meter which measures the power output of a laser by utilizing the optogalvanic effect in the electrode space of a glow discharge which is made to operate on the left side of the Paschen curve where breakdown voltage i... | 10/22/1985 |
| 4381148 | Power meter for high energy lasers A power meter for non-destructively measuring the power of a high energy er beam. The power meter includes a cell disposed in the flow path of a gas containing a laser radiation-absorbing species. The absorption coefficient of the absorbing species is sm... | 04/26/1983 |
| 4344172 | System for measuring the radiation power of power-modulated transmitters, in particular of lasers A system for measuring the radiation power of power-modulated transmitters, in particular of lasers, includes an opto-acoustical converter converting the radiation modulation into gas-pressure modulation. The components of the opto-acoustical converter di... | 08/10/1982 |
| 4339199 | Pulsed laser beam intensity monitor A pulsed laser beam intensity monitor measures the peak power within a selectable cross section of a test laser beam and measures integrated energy of the beam during the pulse period of a test laser. A continuous wave laser and a pulsed ruby laser are co... | 07/13/1982 |
| 4327285 | Electron-optical image tubes and streak cameras A record is obtained of repetitive optical phenomena having durations in the picosecond or subpicosecond range by synchronizing the deflection of the electron image in an electron-optical streaking image tube with the repetition rate of a pulse train from... | 04/27/1982 |
| 4306807 | Light measuring system In the disclosed system, a light measuring circuit having a logarithmical amplifier, is constructed to produce pulses at a frequency corresponding to the output of the light measuring circuit. Pulses are counted during a time interval corresponding to the... | 12/22/1981 |
| 4281897 | Photometric system including a time-division optical attenuator A photometric system is provided for use as a spectrophotometer system; or for use as a calibration system for accurately calibrating optical attenuators, such as neutral glass filters, interference-type filters, comb filters, screen filters, and the like... | 08/04/1981 |
| 4264211 | Light sensor To measure the density of a foilage canopy, an elongated average-light measuring instrument includes an elongated diffuser, an elongated quartz rod with a uniform diffusing groove in it between it and the diffuser and a photodiode at one end so that radia... | 04/28/1981 |
| 4252440 | Photomechanical transducer Light absorbing ultra-thin films mounted under a fixed strain exhibit the behavior of an optomechanicalor photomechanical transducer. The transducer responds to light in a quick and reversible manner converting a time-variable light source into a time-var... | 02/24/1981 |
| 4193766 | Device and method for preparation of a control solution for ketone determination A device and method for preparing a ketone body control solution. The device comprises a carrier vehicle having incorporated with it a metal ion complex of a dione compound. The dione compound is characterized as having the structure ##STR1## wh... | 03/18/1980 |
| 4187026 | Photoacoustic method and apparatus for measuring intensity of electromagnetic radiation Electromagnetic radiation is detected, using a photoacoustic cell employing a uniform absorber of radiation which absorbs independently of wavelength.... | 02/05/1980 |
| 4177566 | Insolation survey device An insolation survey device for determining the exposure of a reference point to a cyclically varying radiation source. The device employs a base member for horizontally supporting a display sheet premarked with a grid calibrated in units corresponding to... | 12/11/1979 |
| 4152074 | Inverse fourth power photometric calibrator A photometric calibrator is disclosed wherein a known and continuously vable amount of light flux received at a detector is linearly proportional to the inverse fourth power of the optical path length between the detector and a primary, quasi-point sourc... | 05/01/1979 |
