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| Number | Title | Issue Date |
| 4616137 | Optical emission line monitor with background observation and cancellation A fiber optics based optical emission line monitoring system is provided in which selected spectral emission lines, such as the sodium D-line emission in coal combustion, may be detected in the presence of interferring background or blackbody radiation wi... | 10/07/1986 |
| 4591725 | System for amplifying all frequencies detected from a flame detector A fail-safe, self-checking flame monitoring circuit is provided without the use of a mechanical shutter in which a photodetector provides a signal corresponding to flame intensity (including flicker), an amplifier amplifies the signal, the amplification i... | 05/27/1986 |
| 4555800 | Combustion state diagnostic method A method of diagnosing a combustion state in a furnace of a boiler wherein the shape of the root part of a flame (namely, the part closer to the fuel jet port of a burner) is picked up by an image sensor or the like, and the combustion state is diagnosed ... | 11/26/1985 |
| 4547673 | Smoke and flame detector Apparatus for detecting flame or smoke, having a radiation detection tube enclosed in a housing, facing the exterior through a transparent window at one end of the housing, and having a radiation source proximate the other end of the housing and external ... | 10/15/1985 |
| 4540886 | Fail-safe monitoring system A fail-safe system for monitoring a condition and activating controls in response either to the non-existence of that condition or the failure of any component in the system, in which a preliminary fail-safe oscillation train derived from sensing the cond... | 09/10/1985 |
| 4533834 | Optical fire detection system responsive to spectral content and flicker frequency A fire detection system using optical fibers to transmit flame signals from a plurality of remote monitoring stations to a central detection and analysis station, the invention comprises a network of optical fibers which connect the monitoring stations to... | 08/06/1985 |
| 4491142 | Automatic stopping device of combustion fuel supply An automatic fuel supply stopping device incorporated in fuel combustion equipment including a shut-off valve and a combustor. The automatic fuel supply stopping device comprises a fluid intercepting mechanism interposed in a channel through which the fue... | 01/01/1985 |
| 4464575 | Test device for an optical infra red detector A test device for a multiple channel infra red detector utilizing photocells comprising an aperture plate mounted on the housing member of the detector. In the embodiment described a test lamp is mounted on a surface portion of the aperture plate in fixed... | 08/07/1984 |
| 4461571 | Test system for wave guide arc detector circuits A system for testing a wave guide arc detecting circuit for a microwave system is disclosed. Testing is accomplished by utilizing a pulsed laser source to generate pulses of optical energy which are used to simulate an electrical arc across the wave guide... | 07/24/1984 |
| 4415264 | Spectrophotometer gas control system This invention relates to a spectrophotometer which includes a burner adapted for burning a gaseous fuel and for atomizing a sample to be analyzed in a burner compartment, mechanical elements or electrical circuitry serving to periodically pass a beam of ... | 11/15/1983 |
| 4395638 | Self-checking flame failure control This invention relates to control circuits of the type which continuously monitor their own performance so as to be self-checking, i.e., to produce a response whenever the system shows the absence of a condition being monitored or a change therein and als... | 07/26/1983 |
| 4381455 | Flame detector including detector testing apparatus A flame detector for monitoring the flame of a burner including an electrically actuatable photo shielding element positioned between a photoelectric element and the flame. The normally transparent photo shielding element may be turned opaque on command f... | 04/26/1983 |
| 4370557 | Dual detector flame sensor In a multi-burner boiler or industrial furnace installation that uses pulverized coal for fuel and utilizes an oil pilot torch it has been difficult to sense and discriminate satisfactorily between safe and unsafe burner operation in these multi-burner ar... | 01/25/1983 |
| 4328488 | Flame-detecting apparatus including a field-limiting device In a flame-detecting apparatus for developing an electrical signal responsive to light, impinging on a light-responsive surface from a predetermined flame area, for example, in a combustion chamber, a convex lens member is disposed at a distance from the ... | 05/04/1982 |
| 4317045 | Flame monitoring apparatus and method A method of monitoring a selected flame in a multi-burner furnace comprises positioning two arrays of photoelectric sensors, providing an optical path for the sensors of each array so that the line of sight of one sensor of one array will intersect the li... | 02/23/1982 |
| 4280184 | Burner flame detection Method and apparatus for evaluating the quality of a flame in response to outputs from a flame sensor. The present invention includes a method and apparatus in which output pulses from a flame sensor are continuously counted.The number of pulses is accumu... | 07/21/1981 |
| 4280058 | Flame detector The detector has first and second circuits which are interconnected. The first circuit senses the emission of a flame at least in the wavelength range of carbon dioxide and produces useful signals for an alarm means. The second circuit senses spurious emi... | 07/21/1981 |
| 4234257 | Flame photometric detector adapted for use in hydrocarbon streams Gas analysis, intended primarily for the quantitative and qualitative analysis of sulfur, is performed utilizing flame photometry by burning a sample of the gas to be analyzed in a hydrogen rich flame in which combustion is supported by an excess of oxyge... | 11/18/1980 |
| 4233596 | Flare monitoring apparatus A flare monitoring apparatus for detecting the generation of black smoke in a flare, the excessiveness of a flare and extinguishment of a flare based on the ratio and/or difference between an emissive power of infrared radiation emitted from a flare at a ... | 11/11/1980 |
| 4233504 | Apparatus for detecting the passage of glowing embers An infrared detector of sufficient sensitivity and stability to provide for the reliable detection of a glowing ember moving through an enclosed carrier system (duct or conveyor) in which a photo-resistive device for viewing the interior of the carrier is... | 11/11/1980 |
| 4229659 | Oxidizer burn through detector with majority voting network A system for detecting oxidizer burn through comprising a network of three ndependent photodetectors and their associated circuitry connected to a two-out-of-three majority voting network. When a fire occurs, the photodiodes will produce a response. If two... | 10/21/1980 |
| 4227369 | Control systems for apparatus Infra-red radiation detectors are used in gas turbine engines to detect radiation produced by the turbine blades giving an indication of blade temperature. Above a given limit the signal produced by the detector is passed to the fuel control system to shu... | 10/14/1980 |
| 4206454 | Two channel optical flame detector A flame detector which is capable of discriminating between hydrocarbon fires and background radiation produced by the sun, artificial light or black body radiation. Two radiation sensors are provided, each being responsive to separate known radiation pea... | 06/03/1980 |
| 4163903 | Flame monitoring apparatus The apparatus includes a radiation gathering device having a narrow acceptance angle and mounted in a multiburner boiler to sight substantially across the discharge end of the burner nozzle. Radiation collected by the gathering device is transmitted by a ... | 08/07/1979 |
| 4122351 | Automatic targeting of plasma spray gun A means for monitoring the material portion in the flame of a plasma spray gun during spraying operations is provided. A collimated detector, sensitive to certain wavelengths of light emission, is used to locate the centroid of the material with each pass... | 10/24/1978 |
| 4039844 | Flame monitoring system A flame monitoring system includes a flame sensor for producing a flame signal as a function of flame conditions in a monitored environment and flame signal enhancing circuitry coupled to the flame sensor. The flame signal enhancing circuitry has a first ... | 08/02/1977 |
| 4037113 | Flame detector A flame detector device for use with boiler systems has been devised wherein a radiation sensitive means responds when energized by incident radiation of the selective frequency bandwidth to produce a signal indicative of the existence of a flame. A light... | 07/19/1977 |
| 4003039 | Optical fire detection system A fire detection system of the type utilizing an optical detector with discriminating photo-cells connected in series to form a voltage divider, with the rise in voltage at the junction of the photo-cells being utilized as the input to an amplifier to ene... | 01/11/1977 |
| 3993900 | Shutter for optical detection A shutter, for an optical detector head having a sleeve containing a focusing lens adjacent a first sleeve open end for directing incident radiation onto a photocell positioned at the other sleeve end, and includes a rotatable spherical shutter member of ... | 11/23/1976 |
| 3988725 | Detector system A detector system particularly adapted for use in installation where the supply voltage is subject to wide variations comprises a detector which produces a voltage in response to a condition to be detected, a supervisory circuit, and an alarm actuator, in... | 10/26/1976 |
| 3967255 | Flame detection system A flame detection system comprising two light responsive photovoltaic photocell sensors in combination with corresponding light filters, a photovoltaic sensing amplifier, a control amplifier, and a power source. The photocell/filter combinations are respo... | 06/29/1976 |
| 3958126 | Logic circuitry A burner control system has a field device and control logic for providing a control signal to change the state of the field device. A comparator that compares signals from field and the control logic comprises translation circuitry that is arranged to pr... | 05/18/1976 |
| 3936648 | Flame monitoring apparatus A filter having a cut-off frequency of the order of 50Hz is included in the circuit of flame monitoring apparatus to remove signals below the cut-off frequency. In the circuit shown, a silicon p-n junction photo-electric pick-up is capacitively connected ... | 02/03/1976 |
