Matches 251 - 300 out of 614 < 1 2 3 4 5 6 7 8 9 10 11 12 13 >
Match Document Document Title
5442190 Method and apparatus for the measurement of airborne fibres  
Apparatus for measuring the quantity of fibers present in a gaseous fluid includes a pair of sloping shield electrodes (21) to shield charged fibers from the influence of a precipitating field...
5440143 Folded-path optical analysis gas cell  
A folded-path gas cell employs an elliptical concave mirror in confronting relationship to two substantially spherical concave mirrors. At least one of the spherical mirrors, and usually both, are...
5434430 Drop size detect circuit  
An optical drop detect circuit for a thermal ink jet printer. The optical drop detect circuit includes an optical sensor for providing an electrical output indicative of a presence of an ink drop,...
5430306 Optoelectronic detector with high, uniform sensitivity and large field of view, for thermal-inkjet inkdrops  
The device ascertains existence of a small inkdrop to be ejected from a thermal-inkjet pen. It includes a light source (preferably a nonpoint source with extended threadlike form perpendicular to...
5424840 In situ chlorophyl absorption meter  
An absorption meter determines concentration of chlorophyll a and pheophytin in liquids. Particularly, an immersible absorption meter has a light source, a reflective flow tube, a signal detector,...
5424558 Apparatus and a method for dynamically tuning a particle sensor in response to varying process conditions  
A method and an apparatus allow dynamic tuning of a particle sensor. The particle sensor provides output signals indicating particle detection to a controller, which includes an amplifier whose...
5422495 Optical sensor having a floatation means for detecting fluids through refractive index measurement  
The present invention provides methods and systems for sensing the presence of fluids, such as hydrocarbon-based liquids and/or water, in an ambient environment based upon their light refractive...
5420440 Optical obscruation smoke monitor having a shunt flow path located between two access ports  
An obscuration type optical smoke monitor is provided for use particularly in dusty and dirty environments. The smoke monitor comprises a housing enclosing a smoke monitoring chamber; two access...
5412221 Particle fallout/activity sensor  
A particle fallout/activity sensor measures relative amounts of dust or other particles which collect on a mirror in an area to be monitored. The sensor includes a sensor module and a data...
5404228 Misalignment detection apparatus for transmissiometer with underfilled reflector  
In accordance with this invention, a misalignment detector apparatus is provided for a transmissometer with an underfilled reflector. The transmissometer has a transceiver that projects a...
5363199 Smoke opacity detector  
A smoke opacity detector includes a sample chamber; a sample heating block in the sample chamber for heating a sample; a first temperature control for controlling the temperature of the sample...
5360980 Structure and method for providing a gas purge for a vacuum particle sensor installed in a corrosive or coating environment  
A structure and an apparatus are provided for use in particle sensor installed to monitor particle level of a process chamber. The process chamber receives process gas from a supply line and...
5357117 Method of monitoring the presence or absence of liquid and apparatus therefor  
A method of monitoring a discharge of a liquid comprises the steps of: measuring a presence or absence of a liquid discharged at an optional area of a passage for the liquid during discharging the...
5354999 Leak detection achieved by detection of light transmitted through an opaque layer interrupted by a passing bubble  
A tank filled with water is covered by a layer of oil containing carbon black. A radiation source preferably a high intensity visible spectrum light is aimed at the bottom surface of the oil/carbon...
5350929 Alignment system for multiple color pen cartridges  
A multiple printhead cartridge color thermal ink jet printer having apparatus for measuring the offsets between the multiple printhead cartridges each of which includes a nozzle array of one or...
5347138 In situ real time particle monitor for a sputter coater chamber  
A structure and a method use a non-invasive particle monitor to detect particles in a process chamber for a "down sputtering" metal deposition process. In one embodiment, only non-spherical...
RE34704 Improved pollution detection apparatus  
In a smoke detection system, smoke density in a sampling chamber is measured by flashing a strobe light through the chamber and sensing light flux emitted from the chamber and comparing it with...
5324956 System for characterizing movement and temperature of fluids  
A system for characterizing the pressure, temperature, movement and flow patterns of a fluid under high pressure within a test cell. The test cell is lined internally with adjustable rock facings....
5323017 Low/high alarm for polymer flow  
A low cost optical sensor using ordinary non-coherent light reads the polymer content of a processed polymer solution and gives a go/no-go signal in response thereto. The system shuts down in...
5321274 Automatic intermittent energization controller of electrostatic precipitator (ESP)  
An electrostatic precipitator (ESP) intermittent energization controller is included with a CPU that adaptively controls the DC power used to energize the ESP. An opacimeter is mounted to the ESP...
5313072 Optical detector for windshield wiper control  
An optical device is provided for detecting the degree of obscuring moisture or precipitation on the windshield of an automotive vehicle. A source of light, such as a light emitting diode (LED) or...
5304814 Sensor circuit and method for detecting the presence of a substance such as ink ejected from a thermal ink ejecting print head, or the like  
A sensor circuit and method for detecting the presence of a substance having a flow that can be turned on and off, such as ink in an ink ejecting print head, has means for turning on and off the...
5291030 Optoelectronic detector for chemical reactions  
Changes in the state of a chemical reactant, particularly a resin used for purifying gases, are measured by directing a beam of light through the reactant and detecting changes in the light...
5287168 Sensor for monitoring solute in a liquid stream  
The sensor system monitors solutes in a liquid stream by analyzing the amount of light absorbed in a liquid in a particular wavelength band. The sensor system is arranged for selectability of the...
5268568 Marker dye band detector for gel electrophoresis using balanced light emitters  
A device for detecting the marker dye band which is used to monitor the progression of biological macromolecules in gel electrophoresis. This device mounts external to the gel box, and utilizes a...
5266798 High sensitivity, large detection area particle sensor for vacuum applications  
A particle sensor which employs the principle that a particle passing through an intense laser beam will scatter light to a photodetector which then generates a measurable signal is provided. The...
5260585 Endpoint and/or back diffusion gas impurity detector, and method of using the same  
An endpoint detector for gas purifiers which contains a detection element comprising a small amount of a highly reactive metal coated on an insulator and exposed to the gas stream being purified....
5255073 Apparatus for emitting and receiving light  
An apparatus for emitting and receiving light comprises an emitter, which consists of a light source (5) and a concave mirror (7), and a receiver which receives light from the emitter and which is...
5254861 Biological aerosol particle detector and method having an electronic pulse detection means  
System and method for detection and measurement of airborne biological aerosol particles in a gaseous sample are described comprising a source of low energy radiation for irradiating the gaseous...
5241368 Fiber-optic probe for absorbance and turbidity measurement  
An optical probe apparatus (10) is for testing physical properties of a fluid (F) such as turbidity. The apparatus comprises a probe assembly (16) removably insertable into the fluid. A photometric...
5239185 Method and equipment for measuring absorptance of light scattering materials using plural wavelengths of light  
In order to make it possible to measure the light absorption coefficient of various sorts of substances contained in a light scattering material with a high precision, the wavelength of light...
5218212 Device for optically detecting a chemical change in fluid  
A device for optically detecting a chemical change of fluid comprises a prism placed in fluid to be tested and a layer of color indication material formed on a surface of the prism to thereby...
5212393 Sample cell for diffraction-scattering measurement of particle size distributions  
A sample cell for use in measuring the particle size distribution of samples using diffraction-scattering measurement methods has a radiating surface which is beveled to increase the angle of...
5208465 Automatic detection system of oil spillage into sea waters  
An automatic detection system for control of oil spillage into sea waters comprising a plurality of optical fiber cables connected each to a control box and to a plurality of sensors located...
5206519 Constituent concentration indicator with a differentiator means and a signal conditioning means  
The Rolling Average Rate Read Indicator and Method detects the presence of a particular constituent in either a solid, liquid or gas and returns a rapid and accurate measurement of the...
5202570 Gas detection device  
A gas detection device employs a tunable wavelength laser, modulated about an absorption line of a gas to be detected. By measuring the ratio of the fundamental to the second harmonic of the...
5200627 Apparatus and method for monitoring flow of infusion liquid  
The invention includes a blood detector disposed on a medical liquid duct adjacent a connection to a duct for circulating blood outside the body. When the medical liquid ceases to flow, blood...
5194921 Method and apparatus for detecting flocculation process of components in liquid  
A sample flow, including a plurality of components which have different types of spectra and are subjected to flocculation, is irradiated with a light of beam including two or more wavelengths. The...
5194910 Use of optical spectrometry to evaluate the condition of used motor oil  
Methods and apparatus employing optical spectrometry techniques to measure metallic wear debris contamination in used motor oil, even in the presence of carbon particulates. Measurement results...
5185531 Window cleaner for inline optical sensors  
Apparatus for cleaning the interior surface of a window in an inline optical sensors which is subject to contamination and fouling by a product stream in contact therewith. The window surface is...
5185533 Monitoring film fouling in a process stream with a transparent shunt and light detecting means  
Method and apparatus for determining accumulated film thickness at the inside diameter of a main stream conduit conducting a main stream of a flowing fluid by employing: a transparent shunt...
5173600 Apparatus for detecting impurities in a fluid circuit using optical fibers and a magnet  
The apparatus for detecting impurities in a fluid circuit has a body member associated with a fluid conduit or reservoir which defines a detection zone. A magnet is associated with the body member...
5170064 Infrared-based gas detector using a cavity having elliptical reflecting surface  
A nondispersive gas analyzer for use in monitoring the concentration of one or more gases, comprises a body having a cavity having an elliptical reflecting surface, defining a first focus and a...
5170060 Measuring the flow rate of a thin stream of molten material  
For measuring the flow rate of a thin stream of molten materials such as that of glass, the diameter of the thin stream is measured, as is the velocity. The velocity is measured on the basis of the...
5166537 Particle analyzing method and device for realizing same  
According to the present invention, the accuracy of particle size histograms produced from data relating to an impedance variation (Coutler Counter Method) caused by particles passing between...
5141309 Apparatus for indicating how dirty an air filter is in a vacuum-cleaning apparatus, in a room filter, etc.  
An apparatus is provided for indicating how dirty an air filter is that is disposed in an air stream for removing dirt therefrom. The apparatus includes an arrangement in the form of a light unit...
5138181 Apparatus for counting and determining at least one leucocytic sub-population  
An apparatus is disclosed for counting and determining at least one leucocytic sub-population, comprising a case for injecting a flow of sample to be analyzed inside a measurement tank through...
5132941 Method and apparatus for sensing sound waves in a fluid medium  
A method and apparatus (10) for sensing sound in a fluid medium. The apparatus (10) includes an element (12) for generating polarized light having a predetermined plane of polarization. In...
5124859 Narrow bandpass reflective optical filter  
A narrow passband, reflective optical filter at a wavelength L, has a container filled with a pressurized gas, the pressurized gas having a ground state transition corresponding to the wavelength L...
5122655 Particle counter for opaque particles in a fluid stream  
A particle counter operates by the opacity method and has a light barrier or electric eye. The light beam of the light barrier or electric eye penetrates a measuring channel for a fluid transverse...
Matches 251 - 300 out of 614 < 1 2 3 4 5 6 7 8 9 10 11 12 13 >