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6025200 |
Method for remote detection of volatile taggant
A method of tagging and detecting objects is disclosed which comprises the steps of: (a) applying a volatile taggant to the object; and (b) subsequently detecting the presence of the taggant by the...
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6018909 |
Subsurface soil conditioning
Soil profiles of sports fields, such as those in stadiums and golf courses, are treated by injecting or suctioning gases and water by means of buried horizontal pipe arrays or by vertical...
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6018982 |
Gas-permeable connecting lead for a probe
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6018983 |
Method and apparatus for matching refrigerants
Method and apparatus for freon and other refrigerant matching, particularly for servicing of air conditioning systems for automotive applications. The matching process is based upon the comparison...
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6018984 |
Odor detecting apparatus and method
Odors are detected and/or recognized by aspirating samples of odors and odorless air mutually exclusively into an aspirating input of a venturi mixing nozzle along with operating or dilution air...
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6016687 |
Apparatus for indicating ozone exposure
A device using the failure of a material decomposable by ozone to indicate a predetermined ozone exposure. In the preferred embodiment, a plurality of contact rods stretch latex to varying...
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6016686 |
Micromechanical potentiometric sensors
A microcantilever potentiometric sensor utilized for detecting and measuring physical and chemical parameters in a sample of media is described. The microcantilevered spring element includes at...
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6006586 |
Method of measuring gas concentration
A method of measuring a gas concentration for measuring any one of the concentrations of NOx, NO 2 , NO, and O 2 by using one or more sensor elements utilizing a metal oxide semiconductor as a...
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6006582 |
Hydrogen sensor utilizing rare earth metal thin film detection element
A hydrogen sensor for the detection of hydrogen, e.g., in an environment susceptible to the incursion or generation of hydrogen. The sensor includes a rare earth metal thin film arranged for...
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5987964 |
Apparatus and method for detecting gas and vapor
A gas detection circuit for use in selectively detecting a predetermined gas has a plurality of gas sensors coupled to a sensor measuring circuit. Each gas sensor has a different response to the...
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5991696 |
Method for intelligent data acquisition in a measurement system
Provided is a novel method for intelligent data acquisition in a measurement system. The method comprises the following steps: (a) providing a measurement system; (b) performing a measurement with...
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5987963 |
Method of improving the selectivity of a polymer-film gas sensor and a sensor structure for implementing the method
The invention relates to a method for improving the selectivity of a polymer film gas sensor. According to the method, the gas sensor is heated and a sensor parameter sensitive to the variable...
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5985673 |
Method for regeneration of a sensor
A method and apparatus for rapidly and continuously restoring the sensing capacity of thin film sensing elements includes passing a sufficient electrical current through the sensing element to...
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5980102 |
Method for measuring physical characteristics in a pipeline without tapping
A fluid-filled pipe is investigated by a non-intrusive procedure to determine whether the fluid is liquid or gaseous, whether it is flowing or static, the direction of flow if it is flowing, the...
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5979705 |
Fuel blending using blend component octane levels
A fuel dispensing installation that includes first and second fuel tanks containing first and second fuels of different octane levels. The tanks are provided with first and second octane level...
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5979220 |
In-situ sensors for gas turbines
A sensing device for protecting a sensor from environmental conditions present in a turbine is provided. The sensing device comprises a heat pipe exposed to the environmental conditions for...
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5977687 |
Piezoelectric end point sensor for detection of breakthrough of fluid, and fluid processing apparatus comprising same
A sensor for detection of a trace fluid component in a fluid environment, comprising: a piezoelectric crystal having a fundamental resonant frequency in response to an applied oscillating electric...
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5969223 |
Gas sensor package
A gas sensor 1 has a catheter 3 to which a gas sensor body 4 and a signal guide member 5 for guiding a detection signal of the gas sensor body 4 are attached. The other end of the signal guide...
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5969232 |
Catalytic layer system
The invention relates to a catalytic layer system on a resistive gas sensor, especially on a resistive gas sensor layer on a titanate base, with at least one first layer and a second layer lying...
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5969623 |
Gas alarm
A gas detector is disclosed which includes a CO sensor and a processor. The CO sensor senses an environmental CO concentration and provides a variable electrical output in response. The processor...
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5965802 |
NO.sub.x sensor for exhaust gas, and process for producing the same
An NO x sensor is produced by sintering a plurality of columnar crystals of β-type Nb 2 O 5 . The average value M of aspect ratios b/a (wherein a represents a width and b represents a length) in...
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5965801 |
Apparatus for rapid measurement of hydrogen concentration and its use in the measurement of nitrogenase activity
A method and apparatus for rapidly measuring nitrogenase activity of a nitrogen fixing plant growing in a medium in a non-porous container, is described. Gas containing hydrogen is sampled at the...
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5952557 |
Apparatus for analyzing a silicon compound gas for siloxane content
The present invention enables siloxanes which have a detrimental effect on the quality of products during semiconductor production to be efficiently removed from silicon compound gases, and enables...
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5949341 |
Safety system for a materials handling device
A safety system (10) for a materials handling device, for example fork lift truck, conveyor, comprises a sensing head (11) linked to a pressurization control unit (12). The sensing head (11)...
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5949237 |
Microwave cavity resonator for continuous spectroscopic gas analysis
In a microwave resonator for continuous spectroscopic gas analysis with a microwave cavity having dimensions depending on the operating frequency and a setting for a low quality Q of its base mode...
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5948962 |
Gas detection system with interchangeable gas sensors
A codable gas detection system with at least one interchangeable gas sensor (2), which has standardized plug-type connections (5,6) between the gas sensor (2) and the measuring device (1), but is...
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5929318 |
System and method for sensing low levels of a particular gas in an atmosphere
A sensor system and method for measuring very low levels of a particular gas in an atmosphere which initially has high level of the gas. A pair of sensors of the particular gas are provided, one of...
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5929317 |
Process for avoiding error in measuring or determining the gas consumption of matter
A process for avoiding error in determining the gas consumption of a sample located in a closed container. An automatic avoidance of error during the phase of adaptation of the sample to the...
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5918260 |
Gas sensor with multi-level sensitivity circuitry
A combustible gas detector or sensors having a multi-level sensitivity circuitry. The gas detector has a bridge circuit for outputing voltages indicative of gas concentrations contacting the bridge...
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5916523 |
Methods for near simultaneous chemiluminescent sulfur and nitrogen detection
A method and apparatus are disclosed for the near simultaneous detection of light emitted from ozone induced chemiluminescence of nitrogen and sulfur species capable of undergoing ozone induced...
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5915268 |
Vertical flow chemical detection portal
A portal apparatus for screening objects or persons for the presence of trace amounts of chemical substances such as illicit drugs or explosives. The apparatus has a test space, in which a person...
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5904170 |
Pressure flow and concentration control of oxygen/ozone gas mixtures
A system for controlling pressure flow and concentration Of O 3 /O 2 positions a thermal MFC upstream from an ozone generator to avoid the adverse effects of ozone on the thermal MFC. A flow...
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5899702 |
Methods for measuring surface area
Methods for measuring the surface area of a top region of a silicon wafer by initially depositing a monolayer of hexamethyldisilizane over the surface area of the silicon wafer. The silicon wafer...
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5898101 |
Method of operating chemical sensors
A method of operating chemical sensors (21) uses synchronously pulsed signals to reduce the power consumption of the chemical sensors (21). A first voltage source can be used to control and to heat...
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5895627 |
Simplified ethylene oxide sterilization test pack
A test pack for evaluating an ethylene oxide sterilization process, comprising an open ended fiber board tubular member, an end cap enclosing each end of said tubular member, said end caps defining...
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5894083 |
Continuous gas analyzer
A standard gas introduction passage and an air inlet port are provided on positions downstream and upstream a dehumidifier respectively. A zero gas and a span gas are measured in dry states, a...
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5892458 |
Apparatus for recognition of exchangeable parts in analytical measuring instruments
An apparatus for the recognition of exchangeable parts in an analytical measuring instrument or in an analytical measurement system with several analytical devices, which contain exchangeable parts...
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5886247 |
High sensitivity gas detection
Apparatus and a method for detecting the presence of a predetermined target gas (e.g. CO) is disclosed. The gas has a predetermined pattern of peaks of absorbance to radiation lying within a...
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5880352 |
Method and device for determining the concentration of a substance in a gaseous medium
A method for determining the concentration of a substance in a gaseous medium using a chemical sensor is disclosed. To ensure that the concentration is within the nominal measuring range of the...
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5880353 |
Gas sensor
A gas sensor having a sensor element which is immobilized in gas-tight fashion in a metal housing. The gas sensor has a double-walled protective tube with an outer protective sleeve and an inner...
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5879631 |
Gas detection system and method
A gas detection system and method selectively detects a gas in the presence of nonselected contaminant gases. The system includes a housing having a collection chamber and a sampling chamber...
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5861092 |
Nitrogen oxide detector
A method and a detector for detecting nitrogen oxide in test gas are provided wherein test gas which contains NOx and interference gases is supplied through an oxygen feeder 4 into a measuring...
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5859361 |
Air fuel ratio sensor and a method for making the same
An air fuel ratio sensor has a sensor element having a sensing portion and a flange portion in contact with a tapered portion of an accommodation hole of a housing. The sensor element is hot...
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5859362 |
Trace vapor detection
A method and device for the detection of vapors of cocaine and associated compounds are disclosed. The method involves sampling a volume of air suspected of containing cocaine vapors, passing this...
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5841021 |
Solid state gas sensor and filter assembly
An electrochemical gas sensor is provided, the use of which permits quantitative measurement of volatile gas contaminants in an atmosphere being monitored, generally at ambient temperatures below...
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5832967 |
Vapor recovery system and method utilizing oxygen sensing
A system and method for recovering a gasoline vapor/air mixture from a vehicle tank during the dispensing of gasoline from a storage tank into the vehicle tank in which the flow of the mixture from...
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5831144 |
Refrigeration compressor oil testing process and apparatus
A process and apparatus for determining the amount of contamination in the lubricant phase of a refrigeration system. The process utilizes a clear glass tube which contains an inert substance such...
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H001756 |
Apparatus and process for measuring the gradient of refractivity of a gas
A differential refractometer measures the difference of refractive index of electromagnetic centimeter waves of samples of gas with high sensitivity, and can be used to measure the gradient of...
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5831145 |
Method of introducing selectivity to nonselective gas sensors
A method of introducing selectivity to a non-selective gas sensor for determining an amount of a gas of interest contained in a measurement gas wherein the non-selective gas sensor responds not...
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5831146 |
Gas sensor with multiple exposed active elements
A combustible gas detector or sensor having catalytic coated resistance sensing elements that uses a wheatstone bridge to sense the presence and concentration of any combustible gases in a gas...
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