CN104458651A - Distributed humidity sensing system and control method thereof - Google Patents
Distributed humidity sensing system and control method thereof Download PDFInfo
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- CN104458651A CN104458651A CN201410715285.7A CN201410715285A CN104458651A CN 104458651 A CN104458651 A CN 104458651A CN 201410715285 A CN201410715285 A CN 201410715285A CN 104458651 A CN104458651 A CN 104458651A
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Abstract
The invention provides a distributed humidity sensing system and a control method thereof. The distributed humidity sensing system comprises a laser source, a multiplexed optical switch, at least one humidity detection air chamber and a humidity detection mainframe, wherein the multiplexed optical switch is used for gating a laser signal, and the input end of the multiplexed optical switch is connected with the output end of the laser source; the at least one humidity detection air chamber is used for absorbing spectrum; the humidity detection mainframe is used for controlling the starting of the laser source and the gating of the multiplexed optical switch; the at least one humidity detection air chamber is arranged between the multiplexed optical switch and the humidity detection mainframe; the humidity detection mainframe is also used for receiving the laser information passing through the humidity detection air chamber and calculating the humidity after photovoltaic conversion. According to the distributed humidity sensing system, the multiplexed optical switch is combined with a technology of an optical splitter, and the air chamber is designed by being matched with the technology of the optical splitter, so that an optical circulator which is high in cost and limited in wavelength is prevented from being used; a laser modulation absorption spectroscopy technology is utilized, so that multipoint humidity measurement can be realized.
Description
Technical field
The invention belongs to humidity sensor field, relate to a kind of distributed humidity sensing system and control method thereof.
Background technology
Humidity sensor based on Laser Modulation absorption spectroscopy techniques occurs, its advantage comprises that measuring accuracy is high, fast response time etc., is applied to each humidity detection field gradually.
Humidity sensor of the prior art utilizes gas near-infrared absorption spectrum technology, screen water vapor absorption spectrum, have employed DFB (Distributed Feed Back, distributed Feedback) laser instrument is as LASER Light Source, PIN photodiode is for receiving, adopt the air chamber of photoconductive structure, laser is converted into electric signal and carries out signal transacting after photodiode space-reception, finally exports humidity data.
But this humidity sensor spot measurement cost is high, networking difficulty is large, can not meet regional multimetering.
Summary of the invention
Given this, the invention provides a kind of distributed humidity sensing system and control method thereof, object is to realize multiple spot moisture measurement.
For achieving the above object, the present invention adopts following technical scheme:
On the one hand, the distributed humidity sensing system of the one that the embodiment of the present invention provides, comprising:
LASER Light Source;
Multichannel photoswitch, described multi-way switch is used for gating one road laser signal, and its input end is connected with the output terminal of described LASER Light Source;
At least one Humidity Detection air chamber, for absorption spectrum; And
Humidity Detection main frame, starts for controlling described LASER Light Source, and the gating of described Multichannel photoswitch;
At least one Humidity Detection air chamber wherein said is arranged between described Multichannel photoswitch and described Humidity Detection main frame, and described Humidity Detection main frame also for receiving the laser intelligence passed through from described Humidity Detection air chamber, carries out hygrometer calculation after carrying out opto-electronic conversion.
Further, also comprise at least one optical splitter, for the road laser signal decile by Multichannel photoswitch gating, the input end of described optical splitter is connected with the output terminal of described multidiameter option switch.
Further, described air chamber is light optically-coupled air chamber.
Further, described smooth optically-coupled air chamber comprises outer tube and is arranged on the optical fiber collimator at described outer tube two ends, and described outer tube wall has air hole.
Further, described outer tube is copper pipe or ceramic pipe.
Further, described Humidity Detection main frame comprises:
Photodiode, for converting the laser signal exported from described smooth optically-coupled air chamber to current signal;
Trans-impedance amplifier, for converting described current signal to voltage signal, its input end connects the output terminal of described photodiode;
Voltage amplifier, for amplifying described voltage signal, its input end connects the output terminal of described trans-impedance amplifier;
Analog to digital converter, for the voltage signal of sampling after described voltage amplifier amplifies, its input end connects the output terminal of described voltage amplifier;
Microprocessor, for calculating gating gas humidity, controlling the gating of LASER Light Source unlatching and Multichannel photoswitch, it is connected with the output terminal of described analog to digital converter; And
Display, for showing result of calculation, it is connected by serial communication interface with described microprocessor;
Further, described Multichannel photoswitch selects 1 × N channel, and N is positive integer, and 1 × 8 passage selected at most by described optical splitter.
On the other hand, the control method of a kind of distributed humidity sensing system that the embodiment of the present invention provides, comprises the steps:
Humidity Detection host computer control Multichannel photoswitch gating one road laser signal;
Humidity Detection host driven LASER Light Source carries out Laser Modulation length scanning;
Humidity Detection main frame receives the laser signal exported from Humidity Detection air chamber, carries out corresponding humidity algorithm calculate gating gas.
Further, also comprise: Humidity Detection main frame display result of calculation.
Further, the laser signal that described reception exports from Humidity Detection air chamber, carries out the calculating of corresponding humidity algorithm to gating gas and comprises:
Convert the laser signal exported from described Humidity Detection air chamber to current signal;
Convert described current signal to voltage signal;
Amplify described voltage signal;
Voltage signal after amplifier;
Calculate gating gas humidity.
Compared with prior art, the advantage of technical solution of the present invention is:
The distributed humidity sensing system of one provided by the invention and control method thereof, on the basis of the humidity sensor technology based on Laser Modulation absorption spectroscopy techniques, Multichannel photoswitch is provided with at LASER Light Source output terminal, by the startup of Humidity Detection host computer control LASER Light Source and the gating of Multichannel photoswitch, and receive the laser intelligence passed through from Humidity Detection air chamber, hygrometer calculation is carried out after carrying out opto-electronic conversion, solve the problem that can not meet regional multimetering in prior art, achieve multiple spot moisture measurement.
Accompanying drawing explanation
Exemplary embodiment of the present invention will be described in detail by referring to accompanying drawing below, the person of ordinary skill in the art is more clear that above-mentioned and other feature and advantage of the present invention, in accompanying drawing:
The structural representation of the distributed humidity sensing system that Fig. 1 provides for the embodiment of the present invention one;
The structural representation of the distributed humidity sensing system that Fig. 2 provides for the embodiment of the present invention two;
The preferred structure schematic diagram of the distributed humidity sensing system that Fig. 3 provides for the embodiment of the present invention two;
Humidity Detection main machine structure schematic diagram in the distributed humidity sensing system that Fig. 4 provides for the embodiment of the present invention two;
The control method process flow diagram of the distributed humidity sensing system that Fig. 5 provides for the embodiment of the present invention three;
The operational flowchart of the Humidity Detection main frame that Fig. 6 provides for the embodiment of the present invention three.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, hereinafter with reference to the accompanying drawing in the embodiment of the present invention, by embodiment, technical scheme of the present invention is described clearly and completely, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment one
Fig. 1 gives the structural representation of the distributed humidity sensing system that the embodiment of the present invention one provides, and as shown in Figure 1, this distributed humidity sensing system comprises:
LASER Light Source 10;
Multichannel photoswitch 11, for gating one road laser signal, and its input end is connected with the output terminal of described LASER Light Source;
At least one Humidity Detection air chamber 12, for absorption spectrum; And
Humidity Detection main frame 13, for controlling the gating of LASER Light Source 10 startup and Multichannel photoswitch 11;
Wherein at least one Humidity Detection air chamber 12 is arranged between Multichannel photoswitch 11 and Humidity Detection main frame 13, and Humidity Detection main frame 13, also for receiving the laser intelligence passed through from Humidity Detection air chamber 12, carries out hygrometer calculation after carrying out opto-electronic conversion.
Wherein, LASER Light Source 10 can adopt tunable optical fiber laser, also can adopt semiconductor laser with tunable; Multichannel photoswitch 11 selects 1 × N channel, and N is positive integer, specifically measures quantity according to poll time and user's request and determines; In addition, Humidity Detection air chamber 12 is distributed in different positions, to measure the air humidity of different location simultaneously; Main frame 13 produces the laser of different wave length by serial communication interface driving laser light source 10, and control gating Multichannel photoswitch 11, realize the switching of multi-path laser, wherein serial communication interface can be RS-232 interface simultaneously.
The distributed humidity sensing system that the embodiment of the present invention one provides, on the basis of the humidity sensor technology based on Laser Modulation absorption spectroscopy techniques, have employed Multichannel photoswitch, achieves multiple spot moisture measurement.
Embodiment two
Fig. 2 gives the structural representation of the distributed humidity sensing system that the embodiment of the present invention two provides, as shown in Figure 2, different with the embodiment of the present invention one, also comprises:
At least one optical splitter 20, for the road laser signal decile by Multichannel photoswitch 11 gating, the input end of described optical splitter 20 is connected with the output terminal of described multidiameter option switch 11.
Wherein the laser entering optical splitter 20 is divided into multi-path laser by optical splitter 20, and the power of every road laser is all equal, but can affect measuring accuracy because luminous power is too low, therefore uses at most the optical splitter 20 of 1 × 8 passage, now loss 9dB.
As shown in Figure 3 originally, preferably, the Humidity Detection air chamber 12 in the distributed humidity sensing system in embodiment is light optically-coupled air chamber 30.
Wherein, light optically-coupled air chamber 30 comprises outer tube and is arranged on the optical fiber collimator at outer tube two ends, outer tube wall has air hole, preferably, outer tube wall evenly has air hole, to make gas uniform enter, make measurement data close to actual value; This outer tube can be copper pipe, also can be ceramic pipe, preferably, the present embodiment adopts copper pipe as the outer tube of light optically-coupled air chamber 30, this is because copper pipe is not perishable, intensity is very much not yielding, can guarantee the linear transmission of laser, relative to ceramic pipe, copper pipe is not easily broken.
In addition, the LASER Light Source 10 in the present embodiment adopts distributed feedback laser, this is because the luminous energy of the laser of distributed feedback laser generation is high, wavelength tuning range is wide, wavelength is easy to regulate, can screen the arbitrary wavelength in institute's harmonic section exactly; The present embodiment is to realize 16 moisture measurements, use the optical splitter 20 of Multichannel photoswitch 11 and 1 × 4 passage of 1 × 4 passage, distributed feedback laser wavelength modulated scanning, can synchronously receive four circuit-switched data, again by the switching of Multichannel photoswitch 11, utilize time-division multiplex technology, the circulation realizing each four tunnels is measured; Fibre-optical splice between LASER Light Source 10 and Multichannel photoswitch 11, the fibre-optical splice between Multichannel photoswitch 11 and optical splitter 20 and the fibre-optical splice between optical splitter 20 and light optically-coupled air chamber 30, can use FC/APC fibre-optical splice.
It should be noted that, as long as the condition that the optical maser wavelength that in the present embodiment, LASER Light Source 10 exports meets and the absorption spectrum of tested gas is consistent, can the arbitrary laser instrument of choice for use as LASER Light Source, such as fiber laser, semiconductor laser; Equally, also can measure according to poll time and user's request the port number that quantity determines Multichannel photoswitch 11 and optical splitter 20.
With reference to figure 4, the Humidity Detection main frame of the distributed humidity sensing system that the present embodiment provides comprises:
Photodiode 40, for converting the laser signal exported from light optically-coupled air chamber 30 to current signal;
Trans-impedance amplifier 41, for converting above-mentioned current signal to voltage signal, its input end connects the output terminal of photodiode 40;
Voltage amplifier 42, for amplifying above-mentioned voltage signal, its input end connects the output terminal of trans-impedance amplifier 41;
Analog to digital converter 43, for the voltage signal of sampling after above-mentioned voltage amplifier 42 amplifies, its input end connects the output terminal of voltage amplifier 42;
Microprocessor 44, for calculating gating gas humidity, controlling the gating of LASER Light Source startup and Multichannel photoswitch, it is connected with the output terminal of analog to digital converter 43; And
Display 45, for showing result of calculation, it is connected by serial communication interface with microprocessor 44.
Wherein, photodiode 40 can be PIN photodiode, and wavelength response range is 1200nm ~ 1700nm, and the input end of this PIN photodiode is connected with the output terminal of light optically-coupled air chamber 30; Serial communication interface can be RS-232 interface.
The distributed humidity sensing system that the embodiment of the present invention two provides, on the basis of the humidity sensor technology based on Laser Modulation absorption spectroscopy techniques, have employed Multichannel photoswitch in conjunction with optical splitter technology, and coordinate this technical design light optically-coupled air chamber, avoid that use cost is high, the optical circulator of limited wavelength, solve the problem that can not meet regional multimetering in prior art, reduce cost, improve the applicability of system, achieve multiple spot moisture measurement.
The embodiment of the present invention three is embodiment of the method, and the inventive method embodiment and system embodiment belong to same design, the detail content of not detailed description in embodiment of the method, can with reference to said system embodiment.
Embodiment three
Fig. 5 gives the control method process flow diagram of the distributed humidity sensing system that the embodiment of the present invention three provides, and as shown in Figure 5, the control method of this distributed humidity sensing system comprises the steps:
S10, Humidity Detection host computer control Multichannel photoswitch gating one road laser signal;
In this step, the microprocessor of Humidity Detection main frame can send control signal instruction by RS232 interface to Multichannel photoswitch, to realize the switching of Multichannel photoswitch, wherein Multichannel photoswitch can select the arbitrary passage of 1 × N, and the present embodiment adopts the Multichannel photoswitch of 1 × 4 passage.
S11, Humidity Detection host driven LASER Light Source carry out Laser Modulation length scanning;
In this step, Humidity Detection main frame can export DA control signal by RS232 interface to LASER Light Source, and export the laser of respective wavelength with driving laser light source, the LASER Light Source of the present embodiment can adopt distributed feedback laser.
Laser in the present embodiment specifically for: the laser entering optical splitter is divided into multi-path laser by optical splitter, the power of every road laser is all equal, wherein, consider that laser power loss is on the impact of measuring, 1 × 8 passage selected at most by optical splitter, the present embodiment adopts the optical splitter of 1 × 4 passage, and a road laser of gating is divided into the equal laser of four tunnel light intensity.
In addition, decile Hou tetra-road laser is delivered in the air chamber of four different locations respectively, utilize laser absorption spectroscopy, near the centre wavelength of distributed feedback laser, ceaselessly scan Absorption Line with fixing sweep frequency, make optical maser wavelength intactly one of scanned water in air vapour independently Absorption Line; Preferably, the air chamber in the present embodiment adopts light optically-coupled air chamber, to reduce the loss of laser, reduces error, meets front end air chamber passive design simultaneously, meet the object of essential safety, is adapted at hazardous location, complex electromagnetic environment region and uses.
S12, Humidity Detection main frame receive the laser signal exported from Humidity Detection air chamber, carry out corresponding humidity algorithm calculate gating gas.
In this step, Humidity Detection main frame receives the four road laser exported from above-mentioned smooth optically-coupled air chamber simultaneously, and synchronous this four roads laser signal of process, according to individual absorption line, calculated by the concentration of matching background spectral line to the steam in different air everywhere, and then calculate corresponding air humidity.After calculating terminates, wait for a period of time, circulation above-mentioned steps, carries out moisture measurement to next place.
Finally, be provided with display in the Humidity Detection main frame in the present embodiment, Humidity Detection main frame can connect display display result of calculation by RS-232 interface.
Receive with reference to figure 6, above-mentioned steps S12, Humidity Detection main frame the laser signal exported from Humidity Detection air chamber, the calculating of corresponding humidity algorithm carried out to gating gas and specifically comprises:
S20, convert the laser signal exported from Humidity Detection air chamber to current signal;
In this step, Humidity Detection air chamber adopts light optically-coupled air chamber, photodiode in Humidity Detection main frame receives the laser signal exported from light optically-coupled air chamber, and convert laser signal to current signal, wherein, photodiode can use PIN photodiode, and wavelength response range is 1200nm ~ 1700nm.
S21, convert current signal to voltage signal;
In this step, trans-impedance amplifier converts the weak current signal exported from PIN photodiode to voltage signal, so that subsequent acquisition.
S22, amplification voltage signal;
In this step, voltage amplifier amplifies the voltage signal exported from trans-impedance amplifier, to increase the power of laser signal.
Voltage signal after S23, amplifier;
In this step, adopt analog to digital converter to carry out analog to digital conversion to the voltage signal after amplification, convert the digital signal of applicable microcontroller acquires to.
S24, calculating gating gas humidity.
In this step, the microprocessor in Humidity Detection main frame, according to individual absorption line, is calculated by the concentration of matching background spectral line to the steam in different air everywhere, and then calculates corresponding air humidity.
The control method of the distributed humidity sensing system of the present embodiment, can realize the moisture measurement to 16, a road laser of each gating Multichannel photoswitch, can the humidity of synchro measure 4; Sorting successively to the every tetrad of light optically-coupled air chamber after each optical splitter is 1 ~ 4 tunnel, 5 ~ 8 tunnels, 9 ~ 12 tunnels, 13 ~ 16 tunnels, by switching Multichannel photoswitch, the order poll that can realize Mei Zu tetra-road laser signal switches, afterwards, Humidity Detection host synchronization receives the laser on 1 ~ 4 road or 5 ~ 8 roads or 9 ~ 12 roads or 13 ~ 16 tunnels; After one group of measurement terminates, wait for that 100ms starts to carry out the control of laser modulation length scanning, carry out the moisture measurement of next group.
In the present embodiment, Multichannel photoswitch switch speed adopts 0.5 second/passage, waits for that starting scanning after 0.1 second calculates, and about 0.2 second computing time, realizes 0.8 second time response.16 tunnels all respond 3.2 seconds complete used times, can meet general occasion moisture measurement demand.
The control method of the distributed humidity sensing system that the embodiment of the present invention three provides, on the basis of the humidity sensor technology based on Laser Modulation absorption spectroscopy techniques, by control signal gating Multichannel photoswitch, driving laser light source carries out Laser Modulation length scanning, in conjunction with optical splitter technology, and with the use of light optically-coupled air chamber, avoid that use cost is high, the optical circulator of limited wavelength, solve the problem that can not meet regional multimetering in prior art, reduce cost, improve the applicability of system, achieve multiple spot moisture measurement.
Above-mentionedly only the specific embodiment in the present invention to be illustrated; but can not as protection scope of the present invention; every according to the change of the equivalence done by design spirit in the present invention or to modify or equal proportion zooms in or out, all should think and fall into protection scope of the present invention.
Claims (10)
1. a distributed humidity sensing system, is characterized in that, comprising:
LASER Light Source;
Multichannel photoswitch, described multi-way switch is used for gating one road laser signal, and its input end is connected with the output terminal of described LASER Light Source;
At least one Humidity Detection air chamber, for absorption spectrum; And
Humidity Detection main frame, starts for controlling described LASER Light Source, and the gating of described Multichannel photoswitch;
At least one Humidity Detection air chamber wherein said is arranged between described Multichannel photoswitch and described Humidity Detection main frame, and described Humidity Detection main frame also for receiving the laser intelligence passed through from described Humidity Detection air chamber, carries out hygrometer calculation after carrying out opto-electronic conversion.
2. distributed humidity sensing system according to claim 1, it is characterized in that, also comprise at least one optical splitter, for the road laser signal decile by Multichannel photoswitch gating, the input end of described optical splitter is connected with the output terminal of described multidiameter option switch.
3. distributed humidity sensing system according to claim 2, is characterized in that, described air chamber is light optically-coupled air chamber.
4. distributed humidity sensing system according to claim 3, is characterized in that, described smooth optically-coupled air chamber comprises outer tube and is arranged on the optical fiber collimator at described outer tube two ends, and described outer tube wall has air hole.
5. distributed humidity sensing system according to claim 4, is characterized in that, described outer tube is copper pipe or ceramic pipe.
6. distributed humidity sensing system according to claim 5, is characterized in that, described Humidity Detection main frame comprises:
Photodiode, for converting the laser signal exported from described smooth optically-coupled air chamber to current signal;
Trans-impedance amplifier, for converting described current signal to voltage signal, its input end connects the output terminal of described photodiode;
Voltage amplifier, for amplifying described voltage signal, its input end connects the output terminal of described trans-impedance amplifier;
Analog to digital converter, for the voltage signal of sampling after described voltage amplifier amplifies, its input end connects the output terminal of described voltage amplifier;
Microprocessor, for calculating gating gas humidity, controlling the gating of LASER Light Source unlatching and Multichannel photoswitch, it is connected with the output terminal of described analog to digital converter; And
Display, for showing result of calculation, it is connected by serial communication interface with described microprocessor.
7., according to the arbitrary described distributed humidity sensing system of claim 2-6, it is characterized in that, described Multichannel photoswitch selects 1 × N channel, and N is positive integer, and 1 × 8 passage selected at most by described optical splitter.
8., for a control method for the arbitrary described distributed humidity sensing system of claim 1-7, it is characterized in that, comprise the steps:
Humidity Detection host computer control Multichannel photoswitch gating one road laser signal;
Humidity Detection host driven LASER Light Source carries out Laser Modulation length scanning;
Humidity Detection main frame receives the laser signal exported from Humidity Detection air chamber, carries out corresponding humidity algorithm calculate gating gas.
9. the control method of distributed humidity sensing system according to claim 8, is characterized in that, also comprise: Humidity Detection main frame display result of calculation.
10. the control method of distributed humidity sensing system according to claim 8, is characterized in that, the laser signal that described reception exports from Humidity Detection air chamber, carries out the calculating of corresponding humidity algorithm comprise gating gas:
Convert the laser signal exported from described Humidity Detection air chamber to current signal;
Convert described current signal to voltage signal;
Amplify described voltage signal;
Voltage signal after amplifier;
Calculate gating gas humidity.
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| CN201410715285.7A CN104458651A (en) | 2014-11-28 | 2014-11-28 | Distributed humidity sensing system and control method thereof |
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| CN201410715285.7A CN104458651A (en) | 2014-11-28 | 2014-11-28 | Distributed humidity sensing system and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105334188A (en) * | 2015-11-12 | 2016-02-17 | 北京航天易联科技发展有限公司 | Gad humidity detecting device |
| CN105738318A (en) * | 2016-02-18 | 2016-07-06 | 北京航天易联科技发展有限公司 | Environment humidity monitoring method and system for cultural relic preservation |
| CN111471589A (en) * | 2020-04-23 | 2020-07-31 | 华中科技大学 | Infrared quantitative PCR nucleic acid detection device |
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2014
- 2014-11-28 CN CN201410715285.7A patent/CN104458651A/en active Pending
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| CN105334188A (en) * | 2015-11-12 | 2016-02-17 | 北京航天易联科技发展有限公司 | Gad humidity detecting device |
| CN105738318A (en) * | 2016-02-18 | 2016-07-06 | 北京航天易联科技发展有限公司 | Environment humidity monitoring method and system for cultural relic preservation |
| CN105738318B (en) * | 2016-02-18 | 2018-11-06 | 北京航天易联科技发展有限公司 | One kind being used for historical relic's protection ambient humidity monitoring method and its system |
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