CN101776593A - Active gas detection method and alarm device thereof - Google Patents
Active gas detection method and alarm device thereof Download PDFInfo
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- CN101776593A CN101776593A CN 200910190393 CN200910190393A CN101776593A CN 101776593 A CN101776593 A CN 101776593A CN 200910190393 CN200910190393 CN 200910190393 CN 200910190393 A CN200910190393 A CN 200910190393A CN 101776593 A CN101776593 A CN 101776593A
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Abstract
The invention relates to an active gas detection method and an alarm device thereof. An infrared receiving device and an infrared generating device are arranged in an area to be measured and used for detecting the condition that infrared signals are absorbed in the air and measuring the concentration of target gas to be measured corresponding to the wavelength by analyzing the intensity of the absorbed wavelength; the active gas detection alarm device comprises an infrared transmitting device, an infrared receiving device, an alarm device and a central control module; both the infrared receiving device and the infrared generating device are arranged in the area to be measured, correspond to each other and are respectively connected with the central control module; and the alarm device is connected with the central control module. Compared with the traditional point-type detection method, the average concentration represented by the measuring result obtained by the measuring method is more reasonable.
Description
Technical field
The present invention relates to a kind of gas concentration detection alarm system, refer to that especially a kind of being used for detect combustable gas concentration and the active gas detection method that can report to the police and the warning device that uses this method at explosive gas atmosphere.
Background technology
At present, has the place of hazardous gas or dangerous gas leakage danger at some, safety near people guaranteeing, usually people are provided for detecting the device of hazardous gas and the device that can report to the police is monitored hazardous gas and concentration in these zones, when the concentration of hazardous gas leakage or hazardous gas surpasses certain dangerous concentrations value, sending the sound that is used to carry out danger early warning crosses the wigwag reminds people and takes precautions against, the common employed gas-detecting device of gas detection warning device is the passive type detection mode at present, this gas-detecting device is fixed on a fixing position, and to be arranged in the explosion isolation device, be drawn into by gas and carry out flame proof in the explosion isolation device the external world, thereby detect the existence and the concentration range thereof of hazardous gas, the mode of the passive detection of this fixed point, not only speed is slower, and cause the obstruction of filtering system in the breathing process easily, moreover in a bigger space, adopt the detection mode of several pick-up units also can cause the result comparatively unilateral, can not correctly react the concentration of hazardous gas in the detected space.
Summary of the invention
Technical purpose of the present invention be for provide a kind of can be to than dangerous gas active detecting of large tracts of land occasion and high active gas detection method and the warning device thereof of accuracy.
Active gas detection method of the present invention, be that infrared receiver and infrared generator are set in tested zone in pairs, infrared transmitting device that should be provided with in pairs and infrared receiver are surveyed the situation of infrared signal absorbed wavelength in air, measure the concentration of the pairing measured target gas of this wavelength by analyzing this power that is absorbed wavelength.
Active gas detection alarm device of the present invention comprises the airborne object gas content that is used for initiatively measuring tested zone, this active gas detection alarm device comprises infrared transmitting device, infrared receiver, warning device and central control module, this infrared receiver and infrared generator all are arranged in the tested zone, and this infrared receiver is corresponding with infrared generator, this infrared receiver all is connected with central control module with infrared generator, warning device is connected with central control module, control two infrared light beam emitting diodes on same surface level by same infrared beam emitter, launch infrared light beam with certain angle continuously to two infrared receiving diodes, when infrared beam passes through certain distance from launching site arrival acceptance point position, different gas composition will produce assimilation effect to the infrared beam of different wave length in the air, reach receiving position and will produce certain decay, this decay is directly proportional with the distance that the concentration and the light beam of this gas pass through in this gas space, can detect the gas concentration of between two points (emitter and receiving trap) by the attenuation degree to a certain certain wave.The concentration value that the metering system of this active probe formula is surveyed is not the concentration value of a point but represents two the specific concentrations values between the point, the i.e. products of concentration and distance.Obviously, this specific concentrations is and 2 distance dependent, that is to say in the distance between 2 under the same percent concentration greatly more, represents the total amount of this space gas just big more, this and traditional metering system have tangible difference, we can say that this measured value is more meaningful at space measurement.Suppose, we represent measurement result with " concentration rice ", measurement data is represented the specific concentrations between 2, this concentration value is equivalent to the mean concentration between 2, because infrared light is absorbed the concentration with gas, light beam the distance of process be directly proportional, and optical path length is known, the gas mean concentration of the environment space that absorbed wavelength of foundation and intensity detection are monitored on the plane that is detected height, by measure two light represent the concentration on a plane, the detection mode of more traditional free diffusion type of use only to detect the definite concentration that concentration that a point comes more can be represented the measured target gas in a space by the gas mean concentration of road warp.
In order to increase the accurately fixed of measurement, if simultaneously launch two infrared light beams at same surface level to two acceptance points with an angle at same infrared light beam launching site, obtain two groups of measurement data respectively at two acceptance points, these data are directly proportional with the gas concentration of two light beam processes and the product of distance respectively, known between from the launching site to the acceptance point apart from the time, measurement result divided by distance just represent two infrared light beams the gas mean intensity value in path of process, because coexisting, two infrared light beams on the surface level, represent the plane mean concentration of monitored point more reasonable with this measurement result.The active gas concentration detection alarm system that utilizes this method to constitute, it will be more scientific and reasonable representing the measuring method of the more traditional point of nearly measurement of its hazard level for flammable or toxic gas.If the gas concentration signal that receiving trap is received is converted to current signal through the gas concentration conversion equipment and is delivering to the gas alarm control device, on alarm control unit, just can set in advance alarm set point, when surpassing alarm set point concentration, alarm controller just can send sound with or the high concentration alerting signal of light.
Above-mentioned central control module comprises the light beam wavelength detecting unit that the wavelength of the light beam that infrared receiving device is received detects and screens, data storage cell and the CPU (central processing unit) that is used for data processing, this light beam wavelength detecting unit is connected with CPU (central processing unit), data storage cell is connected with CPU (central processing unit), this data storage cell stored is useful on the optical wavelength data parameters of judging light wave intensity, the optical wavelength data parameters that described optical wavelength data parameters can be an inflammable gas, it also can be the optical wavelength data parameters of toxic gas, store up the characteristic wavelength of pairing infrared light beam according to memory cell, system can determine the concentration of inflammable gas or toxic gas exactly, when the hazardous gas in tested place such as inflammable gas or toxic gas are revealed, when if the concentration of inflammable gas or toxic gas surpasses predefined dangerous concentrations value, send and be used to warn sound or the light warning signal that hazardous gas exceeds standard, fire or poisonous hazardous gas are reported to the police and warned.
Above-mentioned infrared generator is the infrared light beam emitting diode, and infrared receiver is the infrared light beam reception diode.
Above-mentioned warning device is simple audible alarm unit, or simple light alarming device, or has not only comprised audible alarm but also comprised the acoustic-optic alarm of light warning.
Beneficial effect: active gas detection method of the present invention and warning device thereof, when changing traditional passive detection and arriving receiving position by the infrared beam that detects emission for initiatively launching infrared beam by the gas of known kind institute degree of absorption, the gas concentration of (infrared beam process) between the active probe clearancen.The measurement result that this measuring method drew is that representative is in certain space that is monitored, the mean concentration of the gas on surface level, what use that its response time of this detection method can improve greatly and measure is mean concentrations in two line segments, obviously the concentration of position gas of measuring a point is more meaningful, this product that utilizes infrared beam to detect principle design does not need just can survey in the actual arrival of the tested gas sensor, and the explosion-proof problem that solves sensor has also just seemed simply.In addition, too much check point is set under the environment for spaciousness also can make troubles concerning the user, the present invention can measure oil gas transmission pipeline equipment or spacious environment easily in real time accurately, owing to adopt the detection principle of infrared beam, thereby longer service life, measurement result is sensitiveer.
For ease of explanation detailed content and the technology relevant, below describe with regard to conjunction with figs. now with the present invention.
Description of drawings
Fig. 1, be the Principle of Process figure of active gas detection method of the present invention;
Fig. 2, for the installation connection diagram of first kind of embodiment of the present invention;
Fig. 3, for the installation connection diagram of second kind of embodiment of the present invention;
Fig. 4, for the installation connection diagram of the third embodiment of the present invention.
Embodiment
Please refer to shown in Figure 1ly, be the Principle of Process figure of the active detection method of active gas detection method of the present invention, this method comprises following step:
Step 100: this active gas detection method is by infrared receiver and infrared generator are set in tested zone in pairs;
Step 105: this infrared transmitting device and infrared receiver are surveyed infrared signal absorbed wavelength situation in air;
Step 110: measure the concentration of the pairing measured target gas of this wavelength by analyzing this power that is absorbed wavelength.
Please refer to shown in Figure 2, active gas detection alarm device of the present invention comprises the airborne object gas content that is used for initiatively measuring tested zone, this active gas detection alarm device comprises infrared transmitting device, infrared receiver, warning device and central control module, this infrared receiver and infrared generator all are arranged in the tested zone, and this infrared receiver is corresponding with infrared generator, this infrared receiver all is connected with central control module with infrared generator, warning device is connected with central control module, control two infrared light beam emitting diodes on same surface level by same infrared beam emitter, launch infrared light beam with certain angle continuously to two infrared receiving diodes, when infrared beam passes through certain distance from launching site arrival acceptance point position, different gas composition will produce assimilation effect to the infrared beam of different wave length in the air, corresponding wavelength will produce certain decay when reaching receiving position, this decay is directly proportional with the distance that the concentration and the light beam of this gas pass through in this gas space, can detect the gas concentration of between two points (emitter and receiving trap) by the attenuation degree to a certain certain wave.The concentration value that the metering system of this active probe formula is surveyed is not the concentration value of a point but represents two the specific concentrations values between the point, the i.e. products of concentration and distance.Obviously, this specific concentrations is and 2 distance dependent, that is to say in the distance between 2 under the same percent concentration greatly more, represents the total amount of this space gas just big more, this and traditional metering system have tangible difference, we can say that this measured value is more meaningful at space measurement.Suppose, we represent measurement result with " concentration rice ", measurement data is represented the specific concentrations between 2, this concentration value is equivalent to the mean concentration between 2, because infrared light is absorbed the concentration with gas, light beam the distance of process be directly proportional, and optical path length is known, the gas mean concentration of the environment space that absorbed wavelength of foundation and intensity detection are monitored on the plane that is detected height, by measure two light represent the concentration on a plane, the detection mode of more traditional free diffusion type of use only to detect the definite concentration that concentration that a point comes more can be represented the measured target gas in a space by the gas mean concentration of road warp.
In order to increase the accurately fixed of measurement, if simultaneously launch two infrared light beams at same surface level to two acceptance points with an angle at same infrared light beam launching site, obtain two groups of measurement data respectively at two acceptance points, these data are directly proportional with the gas concentration of two light beam processes and the product of distance respectively, known between from the launching site to the acceptance point apart from the time, measurement result divided by distance just represent two infrared light beams the gas mean intensity value in path of process, because coexisting, two infrared light beams on the surface level, represent the plane mean concentration of monitored point more reasonable with this measurement result.The active gas concentration detection alarm system that utilizes this method to constitute, it will be more scientific and reasonable representing the measuring method of the more traditional point of nearly measurement of its hazard level for flammable or toxic gas.If the gas concentration signal that receiving trap is received is converted to current signal through the gas concentration conversion equipment and is delivering to the gas alarm control device, on alarm control unit, just can set in advance alarm set point, when surpassing alarm set point concentration, alarm controller just can send sound with or the high concentration alerting signal of light.
Above-mentioned central control module comprises the light beam wavelength detecting unit that the wavelength of the light beam that infrared receiving device is received detects and screens, data storage cell and the CPU (central processing unit) that is used for data processing, this light beam wavelength detecting unit is connected with CPU (central processing unit), data storage cell is connected with CPU (central processing unit), this data storage cell stored is useful on the optical wavelength data parameters of judging light wave intensity, the optical wavelength data parameters that described optical wavelength data parameters can be an inflammable gas, it also can be the optical wavelength data parameters of toxic gas, store up the characteristic wavelength of pairing infrared light beam according to memory cell, system can determine the concentration of inflammable gas or toxic gas exactly, when the hazardous gas in tested place such as inflammable gas or toxic gas are revealed, when if the concentration of inflammable gas or toxic gas surpasses predefined dangerous concentrations value, send and be used to warn sound or the light warning signal that hazardous gas exceeds standard, fire or poisonous hazardous gas are reported to the police and warned.
In the present embodiment, corresponding infrared generator is the infrared light beam emitting diode, corresponding infrared receiver is the infrared light beam reception diode, warning device also can adopt the mode of multiple warning, can make and adopt simple audible alarm unit, also can adopt simple light alarming device, also can both adopt the acoustic-optic alarm that not only has audible alarm but also have light warning.
Embodiment 1: please refer to shown in Figure 2, be first kind of specific embodiment of the present invention, among this embodiment, used infrared beam emitter 1 and infrared beam receiving trap 5 levels are installed at grade, guarantee infrared beam emitting diode 2 and infrared beam reception diode 4 center lines in a straight line, beam director 3 plays directed and anti-ambient light interference effect.The condition of not having detected gas in normal operation, gas alarm controller 6 provides the power supply power supply to infrared beam emitter 1 and infrared beam receiving trap 5, infrared beam emitter 1 control infrared beam emitting diode 2 continues the emission infrared beam, infrared beam reception diode 4 sends the beam signal that receives to the infrared beam receiving trap and includes conversion equipment 5, the infrared beam receiving trap becomes 4 milliamperes of signals of standard to give gas alarm controller 5 the absorbing wavelength conversion of signals of received infrared light certain wavelengths detected gas, the signal input range of alarm controller 5 is the 4-20 milliampere signal of standard, and the current signal displayed value that receives 4 milliamperes this moment is 0% volume ratio.When having detected gas to exist between infrared beam emitter 1 and the infrared beam receiving trap 5, the signal weakening that infrared beam reception diode 4 receives, the output signal increase that the infrared beam receiving trap includes conversion equipment 5 is promptly: (4+X) milliampere, X is directly proportional with the concentration Y of tested gas.This moment, controller was shown as current gas concentration Y% volume ratio.When tested gas concentration was set in a certain numerical value, controller showed that surpassing this concentration is exportable sound and or visual alarm.Thereby, realized the purpose of active gas detection alarm system.
Including conversion equipment with the infrared beam receiving trap is that inflammable gas methane is example by calibration measurements, and this device has just constituted the purpose of active inflammable gas such as methane detection alarm system.If the infrared beam receiving trap includes conversion equipment by calibration measurements toxic gas such as first carbon monoxide, this device has just constituted the purpose of active toxic gas such as first Carbon Monoxide Detection warning system.Because the concentration mean values of the gas concentration of its measurement representative in this line segment.Therefore, the gas concentration of a more traditional point of measurement more can be represented the hazard level of gas.
Please refer to Fig. 3, shown in Figure 4, be used for scheme of installation that the mean value of the gas concentration on a plane is measured for second kind and three kinds of embodiment of the present invention, two infrared beam emitting diodes 2 on the infrared beam emitter 1,3, on same surface level, launch two bundle infrared beams 8 simultaneously to two horizontal directions with an angle, two infrared beams 8 are respectively by infrared receiving diode 4,6 receive, infrared receiving diode 4,6 deliver to infrared receiving device 5 respectively with the gas concentration signal that is received, 7, two gas concentration signals that the chromacoder in the infrared receiving device will receive are exported to gas alarm controller through arithmetic mean and divided by the distance that light beam passed through at the 4-20 milliampere normalized current signal that converts standard to.Obviously, this concentration signal is represented the average gas concentration of institute's monitored space in the plane of being detected, if with infrared receiving device 5,7, demarcates and is used to detect inflammable gas such as methane then, and system constitutes active plane combustible gas detecting warning system.If with infrared receiving device 5,7, to demarcate and be used to detect toxic gas such as carbon monoxide then, system constitutes active plane poisonous gas detection warning system.If with infrared receiving device 5,7, to demarcate and be used to detect flue gas such as carbon dioxide then, system constitutes the active plane fire detection alarm system.
Claims (7)
1. active gas detection method, this active gas detection method is that infrared receiver and infrared generator are set in tested zone in pairs, infrared transmitting device that should be provided with in pairs and infrared receiver are surveyed the situation of infrared signal absorbed wavelength in air, are absorbed the concentration that measured target gas was measured and calculated to the pairing gas condition of shape wavelength by analyzing this.
2. active gas detection alarm device, be used for initiatively measuring the airborne object gas content in tested zone, it is characterized in that: this active gas detection alarm device comprises infrared transmitting device, infrared receiver, warning device and central control module, this infrared receiver and infrared generator all are arranged in the tested zone, and this infrared receiver is corresponding with infrared generator, this infrared receiver all is connected with central control module with infrared generator, and warning device is connected with central control module.
3. active gas detection alarm device as claimed in claim 2, it is characterized in that: described central control module comprises light beam wavelength detecting unit, data storage cell that the wavelength of the light beam that infrared receiving device is received detects and screens and the CPU (central processing unit) that is used for data processing, this light beam wavelength detecting unit is connected with CPU (central processing unit), data storage cell is connected with CPU (central processing unit), and this data storage cell stored is useful on the optical wavelength data parameters of judging light wave intensity.
4. active gas detection alarm device as claimed in claim 3 is characterized in that: described infrared generator is the infrared light beam emitting diode, and infrared receiver is the infrared light beam reception diode.
5. active gas detection alarm device as claimed in claim 3 is characterized in that: described optical wavelength data parameters is the optical wavelength data parameters for inflammable gas.
6. active gas detection alarm device as claimed in claim 2 is characterized in that: described optical wavelength data parameters is the optical wavelength data parameters for toxic gas.
7. active gas detection alarm device as claimed in claim 2 is characterized in that: described warning device is audible alarm unit or light alarming device or acoustic-optic alarm.
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| CN 200910190393 CN101776593A (en) | 2009-09-23 | 2009-09-23 | Active gas detection method and alarm device thereof |
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| CN 200910190393 CN101776593A (en) | 2009-09-23 | 2009-09-23 | Active gas detection method and alarm device thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103091266A (en) * | 2012-12-29 | 2013-05-08 | 聚光科技(杭州)股份有限公司 | Gas telemetering method with alarm function |
| CN104637257A (en) * | 2014-12-25 | 2015-05-20 | 陈英杰 | Coal gas leakage alarm |
| CN105486644A (en) * | 2016-01-18 | 2016-04-13 | 中国工程物理研究院流体物理研究所 | Safety check system and method based on band-pass filters |
| CN106124710A (en) * | 2016-08-12 | 2016-11-16 | 安徽中杰信息科技有限公司 | Escaping gas concentration inspection method |
-
2009
- 2009-09-23 CN CN 200910190393 patent/CN101776593A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103091266A (en) * | 2012-12-29 | 2013-05-08 | 聚光科技(杭州)股份有限公司 | Gas telemetering method with alarm function |
| CN103091266B (en) * | 2012-12-29 | 2015-01-14 | 聚光科技(杭州)股份有限公司 | Gas telemetering method with alarm function |
| CN104637257A (en) * | 2014-12-25 | 2015-05-20 | 陈英杰 | Coal gas leakage alarm |
| CN105486644A (en) * | 2016-01-18 | 2016-04-13 | 中国工程物理研究院流体物理研究所 | Safety check system and method based on band-pass filters |
| CN105486644B (en) * | 2016-01-18 | 2019-02-26 | 中国工程物理研究院流体物理研究所 | A kind of safety check system and method based on bandpass filter |
| CN106124710A (en) * | 2016-08-12 | 2016-11-16 | 安徽中杰信息科技有限公司 | Escaping gas concentration inspection method |
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Application publication date: 20100714 |