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9007579 Device and method for measuring luminescence  
An optical device for measuring luminescence includes a pulse generator for generating a periodic modulation signal having rectangular pulses, a pulse duration of the pulse being variably...
8558998 Fourier domain sensing  
Methods and systems are disclosed of sensing an object. A first radiation is spatially modulated to generate a structured second radiation. The object is illuminated with the structured second...
8547544 Multichannel photometric measurement apparatus  
A multichannel photometric measurement apparatus according to one embodiment includes: a single signal generator for generating an initial signal, the initial signal containing a harmonic...
8417959 Biometric device based on luminescence  
The present disclosure relates to an apparatus and/or method of identifying a user comprising illuminating a user with electromagnetic energy to induce luminescence and producing an output data...
8184280 Controllable light angle selector  
Disclosed is a controllable light angle selecting device that includes a fixed light selecting means for transmitting light within a limited acceptance angle, optically connected to at least one...
8184279 Fourier domain sensing  
Methods, systems, and apparatuses are provided for measuring one or more sinusoidal Fourier components of an object. A structured second radiation is generated by spatially modulating a first...
8120765 Observation device  
An observation device 1 comprises a light source unit 10, a biaxial scanning system 20, a wavefront modulation unit 30, an optical branching unit 40, a light detection unit 50, a wavefront...
7791719 Using a fixed-frequency oscillation to detect and measure scene inhomogeneity  
An optical system measures scene inhomogeneity. The system includes a mirror for receiving radiance of a field-of-view (FOV) of a scene, and reflecting a portion of the radiance to an optical...
7545488 Apparatus for implementing a light-emitting diode meter  
An light-emitting diode (LED) meter capable of analog presentations is disclosed. The LED meter includes an LED and a reflective object. The reflective object is capable of reflecting light...
7368292 Differential reflection spectroscopy system and method for detecting explosives and other target materials  
A system and method for identifying explosive or other target materials includes the steps of irradiating a first location and a second location spaced apart from the first location from a sample...
5618495 Colorimetric titration method and apparatus  
The invention relates to colorimetric titration method, a titrator and colorimeter device. The titrating apparatus comprises radiant energy means for producing radiant energy. The device includes...
4857735 Light emitting diode spectrophotometer  
A spectrophotometer incorporating a pulsed light emitting diode as a source of radiation. The light emitting diode emits substantially monochromatic light thus negating the need for a separate...
4184768 Self-calibrating photoacoustic apparatus for measuring light intensity and light absorption  
Pulsed light and readily measurable pulsed electrical energy are independently applied to a solid black, conductive sample in a gas-filled photoacoustic cell, each causing the black sample to...
3804535 DUAL WAVELENGTH PHOTOMETER RESPONSE CIRCUIT  
An apparatus to measure the difference in intensity between periodically recurring reference and measure light pulses of different wavelength reaching a photomultiplier tube, the apparatus having...
3790290 SINGLE MODULATED LIGHT BEAM PHOTOMETER  
A photometer in which a light beam is split by a mirror into measurement and reference portions, the reference portion of the beam being reflected back through the beam splitting mirror to a...
3740154 MODULATED COMPOSITION FLAME PHOTOMETER  
This invention relates to an improved flame photometer. The gas to be analyzed is modulated in composition by means of a reference gas devoid of the component whose concentration is sought. This...
3684378 DARK CURRENT CORRECTION CIRCUIT FOR PHOTOSENSING DEVICES  
In a flicker-type photosensing device, photosensor dark current is corrected for by applying the output of the photosensor to a current-to-voltage mode amplifier including a special dark current...
3661466 PHOTOMETRIC SYSTEM FOR CAMERAS  
An exposure control system which automatically compensates for variations in background lighting by exposing a single photocell alternately to the subject and then to the background. A reversing...
3653764 COLORIMETER  
This invention relates to a colorimeter with a light source which through a sample to be investigated illuminates a photo-electric transducer, the output of which is connected to a measuring...
3584961 DEVICE FOR MEASURING GAIN RELAXATION RATE OF A LASER  
A method for measuring the gain relaxation rate of a laser. A laser cavity is periodically interrupted by a rotating chopper wheel to induce loss modulation. A slow response detector measures the...
3498723 MOVIE CAMERA EXPOSURE INTEGRATOR  
3734691 SENSING SYSTEM FOR A CHEMILUMINESCENT INSTRUMENT  
3435213 LIGHT MODULATOR USING LIGHT CHOPPERS  
3426208 METHOD AND APPARATUS FOR MEASURING LIGHT SIGNALS OF LOW INTENSITY BY UTILIZATION OF SHOT NOISE  
3422678 APPARATUS AND METHOD FOR MEASURING TEMPERATURES  
3421012 DISPLACEMENT MEASURING ENCODER WITH UNIFORMLY DISTRIBUTED FLUX MEANS AND COEXTENSIVE FLUX INTERRUPTING MEANS  
3409377 Apparatus and methods for measuring energy of light beams and ion beams  
3398285 Spectro-radiometer with means for eliminating background noise  
3366795 Background discriminator for radiometric devices  
3363507 Two star simulator  
3354320 Light position locating system  
3325644 Switching type radiometer having variable duty cycle  
3312141 System for measuring optical activity of materials  
3299274 Chopper with alternating reflective and absorptive segments for radiant energy measuring system and method of optimizing same  
3274880 Method and apparatus for occultation detection for space navigation  
3272013 Combined radiometer and emissometer  
3257563 Photosensitive variable aperture scanning device  
3256444 Time ratio spectrophotometers  
3222980 Device for accurately measuring small amounts of radiant energy  
3222529 Circuit with two photocells and chopping means having openings related to photocell spacing  
3196687 Absolute pressure gage for ultra-high vacuum measurement  
3186295 Iris photographic photometer  
3131308 Self calibrating radiometer with both reference source and test source interrupted by one chopper and reference source interrupted by a second chopper  
3127809 Single lens reflex motion picture camera  
3076376 Electric measuring circuits  
3034400 Photographic projection printing apparatus  
3024699 Light modulation system  
3012473 Contrast radiometer with background elimination  
3004169 Radiation detecting system  
2969707 Method and means for automatically adjusting a measuring or observation instrument  

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