218 results about "Heat detector" patented technology

A radiation sensor. The inventive sensor has a two-level detector structure formed on a substrate in which a thermal detector element is suspended over the substrate as a microbridge structure. A receiver of electromagnetic radiation is provided on the same side of the substrate in a manner that efficiently couples the radiation field to the thermal detector element. The thermal detector element has a sandwich structure including a heater metal layer, a dielectric layer, and a thin film thermo-resistive material. The thermal detector element is suspended out of physical contact with the receiver. In one embodiment, the receiver is an antenna having a crossed bowtie configuration that efficiently couples the radiation field to the detector element. The inventive radiation sensors are especially useful for mm-wave and microwave sensing applications. The sensor can be used individually or in linear or two-dimensional arrays thereof. The invention also is directed to a method of fabricating such a radiation sensor.

An electronic fuel sensor which utilizes the characteristics of fluid (such as gasoline) to dissipate heat more readily than a gas. Specifically the fuel sensor utilizes a linear array of sensors comprising a couple heat detector and heat source which can determine which of the sensors are in fluid and which are in air.

The present invention provides a method and apparatus for estimating a property of a fluid downhole by exposing the fluid to modulated light downhole and sensing changes in intensity of infrared radiation from the downhole fluid to estimate the property of the downhole fluid. The present invention senses changes in intensity of light by converting the changes to transient changes in temperature of a detector, such as a pyroelectric detector. The present invention performs spectroscopic analysis of fluids by optically filtering the light allowed to impinge on a pyroelectric detector, converting the changes in temperature of the pyroelectric detector to a signal and converting the signal to estimate the property of the downhole fluid. The light source is modulated by mechanically chopping the beam or by electrically pulsing the light source or by steering the beam between different path lengths of sample or between a reference cell (filled with a reference fluid or empty) and a sample-filled cell.

An adaptive evacuation system and method for providing a safety route to evacuees. Active smoke and heat detector information can be obtained from a fire panel. Routes and exits in proximity to the active detectors are assumed to be unsafe and closed for use in evacuation. Evacuation planning is accomplished with the remaining “safe” routes. The progression of fire and smoke and the time-dependent degradation of evacuation route safety associated with progression of fire and smoke can be predicted and initial classification and signaling of route safety can be performed. As the fire progresses, the initial time-dependent classifications are updated and initially safe routes are reclassified as unsafe and then evacuation directions are modified.

A intelligent surveillance platform is provided with wireless two-way sensory surveillance in environments wherein the entire surveillance unit and its supporting structure fit within a standard light switch junction box and otherwise also functions as a light switch. The platform serves as a sensory ‘edge-of-network’ subsystem for use with a local controller, a central data center engine, and a central viewing platform. The edge-of-network sensory element includes sensors, intelligence and transceivers housed in a wall enclosure under a modified light switch faceplate that incorporates a built-in antenna. The sensors may include an embedded camera, microphone, passive infrared heat detector and odor detector. The intelligence includes memory and logic controller. The transceiver has two-way audio and at least one video channel for broadcast. Light switch wiring supplies power to the device, obviating the need for any specialist installation. A re-chargeable battery device built into the unit enables the device to operate maintenance free without the need to replace any parts over the expected life of the battery.

A bolometric heat detector having an active part composed of at least two coplanar electrodes (8, 10) placed in electrical contact with a first thin semiconducting layer (6), doped by a first doping agent with a first type of conductivity. There is a second thin semiconducting layer (4) doped like the first layer or undoped, and a third thin semiconducting layer (2) doped by a second doping agent with a second type of conductivity opposed to the first. The second layer (4) is placed between the first (6) and the third (2) layers.

A fire alarm system is provided including a controller having a signaling delay, a plurality of smoke and/or heat detectors, a plurality of audible devices which may include sirens, public announcement devices and the like, and a plurality of visible devices which may include strobes, fluorescent lighting and the like. The system provides a directional path to areas of safety for occupants in harms way.

There is provided a gas detector capable of detecting hydrogen concentration and humidity independently in the environment containing both hydrogen and water vapor. The gas detector comprises a high-temp exothermic detector unit and a low-temp exothermic detector unit provided with themosensitive resistors of different self-heating temperatures. The gas detector converts gas-level outputs produced by the high-temp exothermic detector unit and the low-temp exothermic detector unit responsive to the hydrogen concentration and humidity into electric signals, and outputs them after computing electrically levels of the hydrogen concentration and humidity contained in a gas introduced into the two detector units through a gas intake opening.

A fire containment and monitoring system includes a control system that communicates with a fire protection system and an array of alarms, smoke detectors, heat detectors, ventilation dampers, fire dampers, fire doors, and manual call points. The system has particular usefulness for kitchens onboard watercraft, especially large ships, where fire containment is critical to the survivability of the vessel, passengers, crew, and cargo. The control system communicates with the alarms, smoke detectors, heat detectors, ventilation dampers, fire dampers, fire doors, manual call points, and fire protection system, and it initiates a comprehensive list of actions if a smoke detector, a heat detector, or a manual call point is triggered within the monitoring portion of the system.

A thermal detector comprising a sensitive material having at least one electrical property of which varies with temperature; an electromagnetic radiation absorber which is in contact with the sensitive material; a substrate providing the function of support; and electrically conductive elements providing electrical continuity between sensitive material and substrate. The sensitive material is wholly or partly in the form of a sheet extending in a direction which is essentially perpendicular to the plane of the substrate. The sensitive material is suspended above the substrate by the absorber which is fixed to the sensitive material in the upper region of the sheet. The absorber is suspended by fixing means which is mechanically connected to the substrate.

The invention discloses a fire light-temperature composite intelligent monitoring warning device for highrise building, comprising a fire signal detector, a signal transmission device, a central processing unit, a data manager, a fire alarming controller and a warning device, wherein, one end of the data manager is connected with the fire alarming controller through a first analog-to-digital converter (ADC), while the other end is connected with the central processing unit through the signal transmission device; the central processing unit is also connected with the fire alarming controller which is connected with the warning device through a second digital-to-analog converter (DAC); the fire signal detector comprises a fire temperature detector and a fire luminosity detector which are respectively connected with the first ADC. The invention which adopts light-temperature composite fire detecting technology combines the characters of accurate measurement of heat detector and quick response of photodetector; moreover, the invention can solve the problems such as failure alarm and false alarm of a fire to a large extent and also can improve the response sensitivity of the detector.

The invention discloses a fire-fighting coordinated control system. The fire-fighting coordinated control system comprises a fire-fighting module, an evacuation module and a fire control room, whereinthe fire-fighting module includes a fire detector, a manual alarm button, a smoke evacuation system, a fire door, a fireproof roller-blind door, a fire hydrant pump and a gas extinguishing device; the fire detector includes smoke detectors and heat detectors which are arranged at a plurality of positions; the evacuation module includes extension telephones for fire-fighting, a fire emergency broadcasting system, a fire alarm, an evacuation indication system and fire-fighting emergency lighting; each extension telephone for fire-fighting is individually linked with an operator for fire-fighting; the fire control room includes a fire alarm controller, a fire-fighting linkage controller, fire-fighting control graph display, the operator for fire fighting and a fire-fighting power supply monitor; and the fire-fighting linkage controller is used for linkage control of the equipment of the fire-fighting module and the evacuation module. By means of coordination between the fire-fighting module, the fire control room and the evacuation module, the fire-fighting coordinated control system performs linkage control of working of fire-fighting equipment, and can timely put out a fire and guide the masses to evacuate.

The invention relates to a network cabinet with refrigeration and extinguishment functions, which comprises a cabinet body and a cabinet top, wherein the cabinet top is provided with a refrigeration chamber and an auxiliary equipment working chamber; the refrigeration chamber is internally provided with a heat exchanger, supplies a refrigerant to the heat exchanger through a refrigerant pipeline, and cools a heat-dissipation pipeline with the refrigerant through the heat exchanger; the heat-dissipation pipeline is connected with the cabinet body; the heat-dissipation pipeline and heat-dissipation fins connected with the heat-dissipation pipeline are employed to perform heat dissipation on network equipment in the cabinet body; and the auxiliary equipment working chamber is internally provided with a gas extinguishant pipeline which extends into the cabinet body and is provided with a gas extinguishant sprayer. The heat exchanger and a gas extinguishant channel are arranged at the top of the network cabinet; the heat-dissipation pipeline and the heat-dissipation fins can be employed to realize the cooling and temperature control in the network cabinet; and extinguishment can be performed when a smoke and heat detector detects abnormities.

The invention relates to the technical field of fire-fighting equipment, in particular to a fire extinguishing system of a perfluoro battery compartment. The fire extinguishing system comprises a fireextinguishing agent storing container, a bottle head valve I, a starting valve, a siphon, a fire extinguishing agent conveying pipeline, an agentia one-way valve, a pressure signaling device, a pipeline connecting component, a pneumatic pipeline, a gas one-way valve, a bottle head valve II, an electromagnet, a driving gas cylinder, a gas decompression machine, a pressure gage, a safe decompression device, a low-pressure sensor, an electrical circuit, a fire extinguishing system control device, a gas detector, a heat detector, a smoke detector, a UPS emergency power source, a mechanical emergency switch, an atomizer, and a box body. A fire extinguishing medium is perfluoro which is non-poisonous, colourless and with high insulation. The detectors (the gas detector, the heat detector, and the smoke detector) with high accuracy and multiple types are adopted, battery fires can be accurately and quickly detected. Automatic, manual and mechanical emergency stating modes are achieved, and therefore reliability, timeliness and accuracy of fire extinguishing system operation are guaranteed.

A smoke and fire alarm system of a China railway high-speed train comprises a power source, a network control system located in a master control room and independent smoke and fire alarm subsystems arranged in carriages, wherein the network control system is provided with a fire protection circuit, each smoke and fire alarm subsystem comprises a controller connected with the power source and a smoke and fire detector connected with the power source, the controllers are connected with the network control system, each controller comprises a microprocessor, each microprocessor is connected with an input unit, an output unit and two CAN transceivers, each microprocessor is provided with two CAN bus interfaces, the number of the smoke and fire detectors is larger than one, the smoke and fire detectors are connected with one another in series through CAN buses, the first smoke and fire detector in the smoke and fire detectors connected in series is connected with the two CAN bus interfaces on the corresponding controller, and the last smoke and fire detector in the smoke and fire detectors connected in series is connected with the two CAN bus interfaces on the corresponding controller. Each smoke and fire detector is of a multi-layer circuit board structure and comprises a microcontroller, a smoke sensor, a linear heat detector and two CAN transceivers, and the smoke sensor, the linear heat detector and the two CAN transceivers are connected with the microcontroller.

A fire detector and method for detecting fires uses a passive NDIR sensor that generates a detector signal based upon either a 15μ absorption band of CO₂ or a 6.27μ absorption band of H₂O and a signal processor which receives the detector signal and generates an alarm signal when a preselected criterion is met. The NDIR sensor relies upon a passive infrared source (such as a very thin film of black plastic material) with a high emissivity (e.g., approximately 1.0), a sample chamber with a low emissivity (e.g., approximately 0.03) thermally decoupled from the passive infrared source and an infrared detector located in a detector assembly thermally coupled to the sample chamber while a heat exchanger is thermally coupled to the sample chamber. Gas entering the sample chamber passes through the heat exchanger and both it and the infrared detector are at a lower temperature than that of the passive infrared source at an onset of a fire while the difference in temperatures between the passive infrared source and the detector increases during the onset of the fire. The sample chamber and the heat exchanger can be formed integrally from aluminum and their internal surfaces may be coated with a hydrophobic membrane.

The invention discloses a teaching experimental apparatus for measuring the two-phase convective heat-transfer coefficient of a micropipe. A micro injection pump is connected with an inlet of a detachable phase mixer through a connecting pipe fitting, a gas storage tank is connected with another inlet of the detachable phase mixer through the connecting pipe fitting, an outlet of the detachable phase mixer is connected with a glass connecting tube, a micron stainless steel tube, a fluid type observer, and the connecting pipe fitting in sequence. The micron stainless steel tube is externally provdied with an insulated black cavity, the inlet end and outlet end of the stainless tube are provided with thermocouples, the stainless steel tube is also connected with heating leads and connected with a power-adjustable heating unit, and the corresponding part of the stainless steel tube is provdied with an online infrared heat detector, the thermocouples are connected with a computer through a data acquisition unit, and the online infrared heat detector and the power-adjustable heating unit are connected with the computer. The teaching experimental apparatus disclosed by the invention aims at the purpose of teaching experiment, takes the two-phase convective heat transfer in the stainless steel tube as a research object, is simple in structure, high in precision, good in stability, and can be used for achieving remote teaching.

The present invention provides a digital linear heat detector with thermal activation confirmation. In operation, a run of the digital linear heat detector with thermal activation confirmation may be made throughout a building and operatively interconnected with a monitoring circuit. Opposite the monitoring circuit at the end of the length of digital linear heat detector with thermal activation confirmation is a resistor that terminates the digital linear heat detector with thermal activation confirmation. A digital linear heat detector with thermal activation confirmation comprises a pair of spring conductors. At least one of which is coated with a thermoplastic NTC material and at least one of which is coated with a non-conductive heat sensitive material. One or both of the conductors may be coated with both the NTC material and the non-conductive heat sensitive material in alternative embodiments of the present invention.

The invention discloses a control system and a method of a heptefluoropropane fire-extinguishing device used for boats. The control system comprises a fire-extinguishing control device, a heat detector, a smoke detector, a light detector, a main power supply, a backup power supply, an emergency start/close button, a displayer, a control panel, an audible and visual alarm, a deflating indicator light, a device interlock, a fire-extinguishing starting device, a pressure signal transmitter, a heptefluoropropane storage bottle, a heptefluoropropane container valve electromagnetic starter, a relief valve electromagnetic starter, an emergency operating panel, a nitrogen storage bottle, a container valve of the nitrogen storage bottle, and the like. According to the system and the method, three fire-extinguishing starting manners, namely an automatic manner, a hand-operated manner and an emergency manner, are adopted, thus enhancing the reliability of the system and avoiding invalidation when the system is dealing with an emergency event. In addition, a fire-extinguishing starting device delay time adjustable technology is adopted. When the technology is applied in a matching manner, the delay time of the fire extinguishing starting device can be adjusted according to the practical situations of protection areas and sites, thus guaranteeing in-time safe evacuation of people in the protection areas and improving the application adaptability of the system.

A method and device that provides independent temperature control of x-ray detector crystals, either singly or in small groups. In addition to a thermal control network for the crystals, electronic devices are associated with each detector crystal and are independently cooled using Peltier devices so that lifetime and reliability are maximized. In most operating environments the ambient temperature is less than the operating temperature of the detector crystals. In these situations, the heat removed from the electronics can be used to heat the detector crystals, resulting in efficient operation.

There is a need for providing a flow sensor with metal film resistor that improves detection sensitivity using a metal film for a resistance heat detector and a resistance temperature detector. The flow sensor with metal film resistor is structured to form a resistance heat detector, a resistance temperature detector for resistance heat detector for measuring temperature of the resistance heat detector, an upstream resistance temperature detector, a downstream resistance temperature detector, and an air resistance temperature detector on a silicon substrate. Plural floating-island insulators are provided for the resistance heat detector and within wiring thereof.

Provided is a combination smoke and heat detector which allows, in spite of a simple structure, light emitted from an indication lamp to be visually confirmed from a wide range of directions. A combination smoke and heat detector (100) includes a body base (10), a printed circuit board (1), a thermosensitive element (2), a dark chamber (3), an indication lamp (4) mounted to the printed circuit board (1), a protective cover (30), and a bar-like light guide (5) for guiding light emitted from the indication lamp (4) to outside of the protective cover (30). The light guide (5) passes through a light guide through-hole (35) formed in the protective cover (30) so as to be mounted therein, with one end surface thereof being faced with the indication lamp (4), and another end surface thereof protruding to the outside of the protective cover (30) by a height substantially equal to or larger than a protruding height of the dark chamber (3). Further, the light guide (5) is arranged oppositely to the thermosensitive element (2), with the dark chamber (3) being sandwiched therebetween.