CN105203485A - Detection device and method for indoor gas - Google Patents
Detection device and method for indoor gas Download PDFInfo
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- CN105203485A CN105203485A CN201510757319.3A CN201510757319A CN105203485A CN 105203485 A CN105203485 A CN 105203485A CN 201510757319 A CN201510757319 A CN 201510757319A CN 105203485 A CN105203485 A CN 105203485A
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Abstract
The invention provides a detection device and method for indoor gas. The detection device comprises only one light source, only one detector and an analysis module, wherein the light source is used for emitting pulsed light signals and measurement light with the wavelength covering an absorption spectrum line of indoor to-be-detected gas; the detector is used for converting the received pulsed light signals reflected by different indoor reflectors into a first group of electric signals, converting the received measurement light which is absorbed by indoor to-be-detected gas and is reflected by the indoor reflectors into a second electric signal, and sending the first group of electric signals and the second electric signal to the analysis module; the analysis module is used for acquiring a distance d according to time difference of the first group of electric signals obtained by the detector and acquiring a content C of indoor to-be-detected gas by virtue of an absorption spectrum technique. The detection device has the advantages of high precision, simple structure, low cost and the like.
Description
Technical field
The present invention relates to photoelectric analysis, particularly relate to indoor pick-up unit and method.
Background technology
At present, remote methane monitor is widely applied in natural gas leaking detects, the ultimate principle that telegauge adopts is: by receiving, analyzing light signal that is in region to be measured after gas absorption and that reflected by metope, thus obtain the gas information to be measured on light path.In order to the absolute concentration of the methane in quantitative expression region to be measured, telegauge need be measured to the distance of metope and the methane adsorption signal on this path simultaneously.Traditional range finding light source adopts the laser instrument can launching 650nm light, and detector adopts silicon materials, and the light source of telegauge adopts the laser instrument can launching 1651nm light, and detector adopts indium gallium arsenic material.The type telegauge has many deficiencies, as:
1. complex structure, needs outfit two to overlap optical system, is respectively used to range finding and absorption signal, weighs about 5 kilograms, as this telegauge of U.S.'s Chinese weighs 5.8 kilograms;
2. cannot be used for the detection of each layer indoor gas in building.For the indoor remote measurement with window, prior art cannot determine the distance of windowpane to metope, also namely cannot obtain indoor gas content;
For the detection of the indoor gas of building more than two layers, existing telegauge is helpless.
Summary of the invention
For solving the deficiency in above-mentioned prior art, the invention provides the pick-up unit of the indoor gas that a kind of precision is high, structure simple, low cost, application are wide, function is strong.
The object of the invention is to be achieved through the following technical solutions:
The pick-up unit of indoor gas, the pick-up unit of described indoor gas comprises:
A light source, an only light source is used for sending pulsed optical signals and measuring light, the absorption line of gas to be measured in the wavelength covering chamber of described measurement light;
A detector, an only detector is used for being converted to first group of electric signal by the pulsed optical signals that the different reverberation in indoor reflects by what receive and after the gas absorption to be measured of indoor, being converted to the second electric signal by what receive by the measurement light that indoor reflection thing reflects, and is sent to analysis module;
Analysis module, the mistiming that described analysis module obtains first group of electric signal according to described detector draws distance d; And the content C of indoor gas to be measured is drawn according to absorption spectroscopy techniques:
D is the distance of indoor window to wall; K is calibration coefficient; b
0for coefficient at zero point; V
2ffor the intensity of gas absorption second harmonic signal; V
1ffor the intensity of gas absorption first harmonic signal; The temperature variation function that S (T) is absorption line; B (P, T) is absorption line temperature pressure compensation relation function.
According to the pick-up unit of above-mentioned indoor gas, preferably, described gas to be measured is methane.
According to the pick-up unit of above-mentioned indoor gas, alternatively, the pick-up unit of described indoor gas comprises further:
Unmanned plane, a described light source, detector are arranged on described unmanned plane.
According to the pick-up unit of above-mentioned indoor gas, preferably, described analysis module is arranged in Control Room or monitoring car; The electric signal of output is wirelessly sent to described analysis module by described detector.
According to the pick-up unit of above-mentioned indoor gas, preferably, a described light source is laser instrument.
The present invention also aims to provide the detection method of wide, the powerful indoor gas of a kind of high precision, application, this goal of the invention is achieved by the following technical programs:
The detection method of indoor gas, the detection method of described indoor gas comprises the following steps:
(A1) an only light source sends pulsed optical signals, and described pulsed optical signals, respectively by the window of indoor and wall reflection, is received by an only detector and is converted to first group of electric signal, and being sent to analysis module;
The measurement light that a described light source sends injects indoor, and the measurement light after gas absorption to be measured, by described wall reflection, is received by a described detector and is converted to the second electric signal, and being sent to analysis module;
(A2) mistiming that analysis module obtains first group of electric signal according to described detector draws distance d; And the content C of indoor gas to be measured is drawn according to absorption spectroscopy techniques:
D is the distance of indoor window to wall; K is calibration coefficient; b
0for coefficient at zero point; V
2ffor the intensity of gas absorption second harmonic signal; V
1ffor the intensity of gas absorption first harmonic signal; The temperature variation function that S (T) is absorption line; B (P, T) is absorption line temperature pressure compensation relation function.
According to the detection method of above-mentioned indoor gas, alternatively, in step (A1), unmanned plane carries a described light source, detector fly to outdoor, and the light that a described light source sends injects indoor.
According to the detection method of above-mentioned indoor gas, preferably, described analysis module is arranged in Control Room or monitoring car; The electric signal of output is wirelessly sent to described analysis module by described detector.
According to the detection method of above-mentioned indoor gas, preferably, described analysis module is arranged on described unmanned plane, wirelessly the content C of described gas to be measured is sent to Control Room or monitoring car.
According to the detection method of above-mentioned indoor gas, alternatively, the detection method of described indoor gas is further comprising the steps:
(A3) if the content C of gas to be measured is non-vanishing, and in increasing trend, prompting is reported to the police, and content information is sent on the communication terminal of owner.
According to the detection method of above-mentioned indoor gas, preferably, described gas to be measured is methane.
Compared with prior art, the beneficial effect that the present invention has is:
1. accuracy of detection is high
Utilize only a set of optical system (only light source, a detector) to record the distance of indoor window to metope exactly, also, the content of indoor gas to be measured can be recorded exactly;
2. simple, the low cost of structure
Only use a set of optical system can measure gas to be measured on indoor window to the distance and optical path of metope, to the absorption of measuring light, to significantly reduce complexity and the cost of telegauge, improve and can safeguard degree;
3. application is wide
Be arranged on unmanned plane by only a set of optical system, unmanned plane flies to different height, thus records the content of indoor gas in different floor by remote measurement, has expanded application;
4. powerful
The content information recorded can be sent on the communication terminal of owner in real time, even if also can know the content of indoor gas outside, finds natural gas leaking information early, gets rid of potential safety hazard.
Accompanying drawing explanation
With reference to accompanying drawing, disclosure of the present invention will be easier to understand.Those skilled in the art it is easily understood that: these accompanying drawings only for illustrating technical scheme of the present invention, and and are not intended to be construed as limiting protection scope of the present invention.In figure:
Fig. 1 is the basic block diagram of the pick-up unit of indoor gas according to the embodiment of the present invention.
Embodiment
Fig. 1 and following description describe Alternate embodiments of the present invention and how to implement to instruct those skilled in the art and to reproduce the present invention.In order to instruct technical solution of the present invention, simplifying or having eliminated some conventional aspects.Those skilled in the art should understand that the modification that is derived from these embodiments or replace will within the scope of the invention.Those skilled in the art should understand that following characteristics can combine to form multiple modification of the present invention in every way.Thus, the present invention is not limited to following Alternate embodiments, and only by claim and their equivalents.
Embodiment 1:
Fig. 1 schematically illustrates the basic block diagram of the pick-up unit of the indoor gas of the embodiment of the present invention, and as shown in Figure 1, the pick-up unit of described indoor gas comprises:
A light source, an only light source is used for sending pulsed optical signals and measuring light, the absorption line of gas to be measured (as methane, the principal ingredient of rock gas is methane) in the wavelength covering chamber of described measurement light; Described light source preferred semiconductor laser instrument;
A detector, an only detector is used for being converted to first group of electric signal by the pulsed optical signals that the different reverberation in indoor reflects by what receive and after the gas absorption to be measured of indoor, being converted to the second electric signal by what receive by the measurement light that indoor reflection thing reflects, and is sent to analysis module;
Analysis module, the mistiming that described analysis module obtains first group of electric signal according to described detector draws distance d; And the content C of indoor gas to be measured is drawn according to absorption spectroscopy techniques:
D is the distance of indoor window to wall; K is calibration coefficient; b
0for coefficient at zero point; V
2ffor the intensity of gas absorption second harmonic signal; V
1ffor the intensity of gas absorption first harmonic signal; The temperature variation function that S (T) is absorption line; B (P, T) is absorption line temperature pressure compensation relation function.
In order to detect the content of different floor indoor gas, further, the pick-up unit of described indoor gas comprises further:
Unmanned plane, a described light source, detector are arranged on described unmanned plane, and unmanned plane flies to different story heights, thus detect the content of different floor indoor gas.
In order to reduce the dead weight capacity of unmanned plane to improve the flying power of unmanned plane, further, described analysis module is arranged in Control Room or monitoring car; The electric signal of output is wirelessly sent to described analysis module by described detector.
The detection method of the indoor gas of the embodiment of the present invention, be also the course of work of above-mentioned detection device, the detection method of described indoor gas comprises the following steps:
(A1) an only light source sends pulsed optical signals, and described pulsed optical signals, respectively by the window of indoor and wall reflection, is received by an only detector and is converted to first group of electric signal, and being sent to analysis module;
The measurement light that a described light source sends injects indoor, gas to be measured is (as methane, the major component of rock gas is methane) absorb after measurement light by described wall reflection, received by a described detector and be converted to the second electric signal, and being sent to analysis module;
(A2) mistiming that analysis module obtains first group of electric signal according to described detector draws distance d; And the content C of indoor gas to be measured is drawn according to absorption spectroscopy techniques:
D is the distance of indoor window to wall; K is calibration coefficient; b
0for coefficient at zero point; V
2ffor the intensity of gas absorption second harmonic signal; V
1ffor the intensity of gas absorption first harmonic signal; The temperature variation function that S (T) is absorption line; B (P, T) is absorption line temperature pressure compensation relation function.
In order to detect the content of different floor indoor gas, further, unmanned plane carries a described light source, detector fly to outdoor, and the light that a described light source sends injects indoor.
In order to reduce the dead weight capacity of unmanned plane to improve the flying power of unmanned plane, further, described analysis module is arranged in Control Room or monitoring car; The electric signal of output is wirelessly sent to described analysis module by described detector.
For the unmanned plane that dead weight capacity is large, in order to reduce complexity, described analysis module can be arranged on described unmanned plane, wirelessly the content C of described gas to be measured is sent to Control Room or monitoring car.
In order to allow owner grasp indoor safety case, find the potential safety hazards such as natural gas leaking early, further, the detection method of described indoor gas is further comprising the steps:
(A3) if the content C of gas to be measured is non-vanishing, and in increasing trend, prompting is reported to the police, and content information is sent on the communication terminal of owner.
Embodiment 2:
According to pick-up unit and the application examples of method in each layer room of residential building in natural gas leaking detection of the embodiment of the present invention 1.
In this application examples, an only light source adopts Distributed Feedback Laser, and the wavelength measuring light comprises 1651nm (corresponding to the absorption line of methane); The driving circuit of laser instrument exports pulsed current signal and continuous current signal to laser instrument, makes laser instrument send pulsed optical signals for finding range, and detects the continuous light signal of Absorption; An only detector adopts indium gallium arsenic material; Unmanned plane adopts large boundary unmanned plane, and a light source and detector are arranged on unmanned plane; The light by window and wall reflection collected by use convergent lens, and the light after convergence is received by a detector; Analysis module is arranged in monitoring car, adopts radio communication between analysis module and detector, and analysis module utilizes pulse signal arrived the mistiming Δ t of detector by the reflected light after window, wall reflection respectively and draw the distance of window to wall
c is the light velocity.
In the course of work of pick-up unit:
Under the control of unmanned aerial vehicle (UAV) control software, unmanned plane flies to different floor, and the pulsed light that laser instrument sends is respectively by window and wall reflection, and the time that reflected light arrives detector is different, and first group of electric signal of output is sent to analysis module;
The continuous light that laser instrument sends injects indoor, absorbed by indoor gas, and by wall reflection, by analyzing the change corresponding to the intensity of the measurement light of the absorption line of methane that detector receives, the second electric signal of output is wirelessly sent to analysis module;
The mistiming of the reflected light signal that analysis module utilizes detector to receive obtains the distance d of window to wall, and then according to formula
obtain methane content;
If the content C of gas to be measured is non-vanishing, and in increasing trend, prompting is reported to the police, and content information is sent on the communication terminal of owner, so that owner processes in time, gets rid of natural gas leaking hidden danger.
Above-described embodiment is only the situation exemplarily giving Methane in Air in sensing chamber, certainly can also be other gas, as poisonous in benzene homologues, formaldehyde, coal gas etc., harmful gas and flammable explosive gas, for a person skilled in the art, the specific embodiment mode of these gas detect, the basis of above-described embodiment not needing pay creativeness can draw.
Claims (10)
1. the pick-up unit of indoor gas, is characterized in that: the pick-up unit of described indoor gas comprises:
A light source, an only light source is used for sending pulsed optical signals and measuring light, the absorption line of gas to be measured in the wavelength covering chamber of described measurement light;
A detector, an only detector is used for being converted to first group of electric signal by the pulsed optical signals that the different reverberation in indoor reflects by what receive and after the gas absorption to be measured of indoor, being converted to the second electric signal by what receive by the measurement light that indoor reflection thing reflects, and is sent to analysis module;
Analysis module, the mistiming that described analysis module obtains first group of electric signal according to described detector draws distance d; And the content C of indoor gas to be measured is drawn according to absorption spectroscopy techniques:
D is the distance of indoor window to wall; K is calibration coefficient; b
0for coefficient at zero point; V
2ffor the intensity of gas absorption second harmonic signal; V
1ffor the intensity of gas absorption first harmonic signal; The temperature variation function that S (T) is absorption line; B (P, T) is absorption line temperature pressure compensation relation function.
2. the pick-up unit of indoor gas according to claim 1, is characterized in that: described gas to be measured is methane.
3. the pick-up unit of indoor gas according to claim 1, is characterized in that: the pick-up unit of described indoor gas comprises further:
Unmanned plane, a described light source, detector are arranged on described unmanned plane.
4. the pick-up unit of indoor gas according to claim 3, is characterized in that: described analysis module is arranged in Control Room or monitoring car; The electric signal of output is wirelessly sent to described analysis module by described detector.
5. the pick-up unit of indoor gas according to claim 1, is characterized in that: a described light source is laser instrument.
6. the detection method of indoor gas, the detection method of described indoor gas comprises the following steps:
(A1) an only light source sends pulsed optical signals, and described pulsed optical signals, respectively by the window of indoor and wall reflection, is received by an only detector and is converted to first group of electric signal, and being sent to analysis module;
The measurement light that a described light source sends injects indoor, and the measurement light after gas absorption to be measured, by described wall reflection, is received by a described detector and is converted to the second electric signal, and being sent to analysis module;
(A2) mistiming that analysis module obtains first group of electric signal according to described detector draws distance d; And the content C of indoor gas to be measured is drawn according to absorption spectroscopy techniques:
D is the distance of indoor window to wall; K is calibration coefficient; b
0for coefficient at zero point; V
2ffor the intensity of gas absorption second harmonic signal; V
1ffor the intensity of gas absorption first harmonic signal; The temperature variation function that S (T) is absorption line; B (P, T) is absorption line temperature pressure compensation relation function.
7. the detection method of indoor gas according to claim 6, is characterized in that: in step (A1), and unmanned plane carries a described light source, detector fly to outdoor, and the light that a described light source sends injects indoor.
8. the detection method of indoor gas according to claim 7, is characterized in that: described analysis module is arranged in Control Room or monitoring car; The electric signal of output is wirelessly sent to described analysis module by described detector.
9. the detection method of indoor gas according to claim 7, is characterized in that: described analysis module is arranged on described unmanned plane, wirelessly the content C of described gas to be measured is sent to Control Room or monitoring car.
10. the detection method of indoor gas according to claim 6, is characterized in that: the detection method of described indoor gas is further comprising the steps:
(A3) if the content C of gas to be measured is non-vanishing, and in increasing trend, prompting is reported to the police, and content information is sent on the communication terminal of owner.
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