CN206515231U - A kind of humidity measuring instrument based on Difference Absorption technology - Google Patents
A kind of humidity measuring instrument based on Difference Absorption technology Download PDFInfo
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- CN206515231U CN206515231U CN201720155983.5U CN201720155983U CN206515231U CN 206515231 U CN206515231 U CN 206515231U CN 201720155983 U CN201720155983 U CN 201720155983U CN 206515231 U CN206515231 U CN 206515231U
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- humidity
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Abstract
The utility model is related to atmospheric humidity sounding technical field, discloses a kind of humidity measuring instrument based on Difference Absorption technology, including dual wavelength laser source module, transmitting-receiving optical antenna module, synergic reflex device and signal detection processing module.Compared to prior art, the beneficial effects of the utility model are：The radiation pattern of the laser of the present apparatus is pulsed, and pulse peak power is high, is adapted to high humility measurement；And pulse frequency is high, it is adapted to real-time feedback information, on signal processing mode more flexibly, no sluggishness.In addition, the present apparatus also has the characteristics of moisture measurement scope is big, to extreme humidity situation, can automated closed-loop adjust the peak power of laser pulse, it is ensured that measurement accuracy.A kind of wide humidity range, the Difference Absorption infrared moisture measurement apparatus of high-acruracy survey are realized, the application fields such as weather monitoring, environmental assessment are applicable to.
Description
Technical field
The utility model is related to atmospheric humidity sounding technical field, in particular it relates to a kind of based on Difference Absorption technology
Humidity measuring instrument.
Background technology
At present, the demand that the whole world is measured atmospheric humidity is on the increase, and moisture measurement is in industrial and agricultural production and national defense construction
In be widely applied, with higher economic and social benefit.But in numerous atmospheric physics parameters, humidity is also by other
The influence of physical quantity, is realized relatively difficult to the high-acruracy survey of humidity.It is wet using various physics and chemical method measuring environment
The principle of degree is a lot, such as evaporation, hygrometer method, electric method, chemical method, spectrum absorption process, thus have developed based on difference
The humidity sensor of Principle and method of measurement.The sensor mechanism for the humidity sensor being most widely used at present is：Utilize sensitivity
The hygroscopicity of element, after it absorbs the moisture of different quality, its physical parameter such as resistance, capacitance etc. change therewith,
This change transitions are exported into after electric signal.The sensor response time manufactured using this sensor mechanism is long, and precision is also not
Enough height, humidity hysteresis is big.This is restricted its application, especially in dynamically measurement high temperature, swiftly flowing atmospheric humidity,
General humidity sensor can not be competent at.
Infrared analysis technology is to measure one of more effective ways and means of atmospheric environment humidity, based on infrared laser inspection
The Humidity Detection of survey technology mainly has Fiber Bragg Grating FBG（FBG）Sensing, fiber evanescent wave coupled method, based on Nafion crystallization
The methods such as purple sensing membrane, spectral absorption method.Because above-mentioned first three methods are individually present shortcoming, thus real application systems compared with
Use spectral absorption method more.The detection of spectral absorption method gas is mainly by detecting sample gas through light intensity or reflective light intensity
Change to detect gas concentration.Spectral absorption method particularly may be divided into second-harmonic detection, spectrum analysis, spectral scan, difference suction
Four kinds of schemes such as receipts.Compare above-mentioned four kinds of schemes, second-harmonic detection is adapted to use Trace Water Vapor Concentration Testing, spectroscopic analysis methods
Cost is high, using limited, and spectral scan and Difference Absorption method have application example, are suitable for as real application systems
Selection scheme.
Utility model content
In order to solve the above technical problems, the utility model provides a kind of humidity measuring instrument based on Difference Absorption technology,
The device is realized to the wide scope of atmospheric environment humidity, high accuracy, dynamic, noncontacting measurement based on Difference Absorption technology.
The utility model is in order to realize above-mentioned technique effect, and the technical scheme used is：One kind is based on Difference Absorption skill
The humidity measuring instrument of art, including dual wavelength laser source module, transmitting-receiving optical antenna module, synergic reflex device and signal are visited
Survey processing module；
The dual wavelength laser source module include laser driving circuit, the laser A being connected electrically respectively and swash
Light device B, and the optical fibre wavelength division multiplexer being connected respectively with laser A and laser B；
The transmitting-receiving optical antenna module includes being sequentially arranged the convex lens and window mirror of optical fibre wavelength division multiplexer front end；
The synergic reflex device includes the light reflecting device for being arranged on window mirror front end；
The signal detection processing module includes signal-processing board, and respectively coupled photodetector A and
Photodetector B, the photodetector A receive the laser signal of window mirror reflection, and the photodetector B receives light reflection
The laser signal of device reflection, the signal-processing board is also connected with laser driving circuit.
Preferably, the laser A is equal to 1310nm semiconductor laser, the laser for the wavelength of output laser
B is equal to 1370nm semiconductor laser for the wavelength of output laser.
Preferably, the laser A and/or laser B are distributed feedback laser, and it is built-in with optoisolator,
The 14 pin butterfly shells with refrigeration are externally provided with, are single-mode tail fiber output.
Preferably, the convex lens are aspherical lens, and its surface is coated with optical anti-reflective film.
Compared to prior art, the beneficial effects of the utility model are：The radiation pattern of the laser of the present apparatus is pulsed,
Pulse peak power is high, is adapted to high humility measurement；And pulse frequency is high, it is adapted to real-time feedback information, in signal processing mode
On more flexibly, no sluggishness.In addition, the present apparatus also has the characteristics of moisture measurement scope is big, can be certainly to extreme humidity situation
Dynamic closed loop adjusts the peak power of laser pulse, it is ensured that measurement accuracy.Realize a kind of wide humidity range, the difference of high-acruracy survey
Divide and absorb infrared moisture measurement apparatus, be applicable to the application fields such as weather monitoring, environmental assessment.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model；
Mark corresponding component names as follows in accompanying drawing：1 is laser A, and 2 be laser B, and 3 be laser driving circuit,
4 be optical fibre wavelength division multiplexer, and 5 be convex lens, and 6 be window mirror, and 7 be photodetector A, and 8 be light reflecting device, and 9 be that photoelectricity is visited
Device B is surveyed, 10 be signal-processing board.
Embodiment
The utility model is further described in detail with reference to specific embodiment.As shown in figure 1, the utility model is carried
A kind of humidity measuring instrument based on Difference Absorption technology, including dual wavelength laser source module, transmitting-receiving optical antenna mould are supplied
Block, synergic reflex device and signal detection processing module.The dual wavelength laser source module includes laser driving circuit 3,
The laser A1 and laser B2 being connected electrically respectively, and the optical fiber ripple being connected respectively with laser A1 and laser B2
Division multiplexer 4；The transmitting-receiving optical antenna module includes being sequentially arranged the convex lens 5 and window of the front end of optical fibre wavelength division multiplexer 4
Mouth mirror 6；The synergic reflex device includes the light reflecting device 8 for being arranged on the front end of window mirror 6；The signal detection processing module
Including signal-processing board 10, and coupled respectively photodetector A7 and photodetector B9, the photodetection
Device A7 receives the laser signal that window mirror 6 reflects, and the photodetector B9 receives the laser signal that light reflecting device 8 reflects,
The signal-processing board 10 is also connected with laser driving circuit 3.
Wherein, the laser A1 is equal to 1310nm semiconductor laser, the laser for the wavelength of output laser
B2 is equal to 1370nm semiconductor laser for the wavelength of output laser.The laser A1 and/or laser B2 are distribution
Feedback laser；And distributed feedback laser is built-in with optoisolator, the 14 pin butterfly shells with refrigeration are externally provided with, are single mode
Tail optical fiber is exported.The convex lens 5 are aspherical lens, and its surface is coated with optical anti-reflective film.
The course of work and principle of the present utility model are：Laser driving circuit 3 is alternately produced two-way driving pulse, respectively
It is 1kHz to modulate laser A1 and laser B2 alternating output frequencies, and pulsewidth is the laser pulse of 1 microsecond.Laser A1 output
End be connected with an input of optical fibre wavelength division multiplexer 4, laser B2 output end and one of optical fibre wavelength division multiplexer 4 it is defeated
Enter end connection, the laser pulse light beam that laser A1 and laser B2 are sent synthesizes beam of laser through optical fibre wavelength division multiplexer 4,
Then the output optical fibre from optical fibre wavelength division multiplexer 4 is launched.Pulse laser beam is collimated by convex lens 5, most of laser
Beam is transmitted into atmospheric environment to be measured via window mirror 6 and carries out detection operations, and fraction light beam reflexes to photoelectricity by window mirror 6 and visited
Survey device A7.The laser beam being transmitted into atmospheric environment to be measured is reflected back window mirror 6 by light reflecting device 8, and enters through window mirror 6
Enter photodetector B9.Photodetector A7 and photodetector B9 output end are connected with signal-processing board 10, photodetection
Device A7 output signal is obtained the intensity rate of two wavelength laser pulses by the calculating of signal-processing board 10 as reference signal
Reference value.Photodetector B9 output signal is calculated by signal-processing board 10 and obtained as by the measured signal of Atmospheric Absorption
Two wavelength laser pulses are by the intensity rate of water vapor absorption.By the laser beam of air by water vapor absorption, and air is not passed through
Laser beam do not absorbed, both attenuation degrees are different；Thus, the width of the laser pulse reflected by light reflecting device 8
Degree ratio changes, and with respect to the variable quantity of reference signal ratio is can calculate air absolute by measured signal ratio
Humidity value.
During measurement, to each wavelength acquisition pulse signal, repeatedly average to reduce error, and carry out digital filtering
Afterwards, respectively obtain the detection wavelength and corresponding output valve of reference wavelength, the ratio of the two as calibration curve independent variable；
According to calibration curve, so as to obtain the absolute humidity values of tested air.Exported according to real-time external ambient air pressure and temperature, by
Doyle Burton laws calculate relative humidity.
For the situation of pole maximum and minimum moisture measurement, signal-processing board 10 according to photodetector B9 working condition,
Two-way Transistor-Transistor Logic level signal is exported, the synchronizing signal as pulsed laser output on laser driving circuit 3 is applied to, closes automatically
Ring controls laser driving circuit 3；Laser driving circuit 3 adjusts the peak value of pulse work(of laser A1 and laser B2 outputs
Rate, realizes wide humidity range measurement.Due to operation principle of the utility model based on Difference Absorption technology, what measurement was obtained is sharp
The ratio of light pulse amplitude, therefore, the change of laser power can't influence measurement result.As long as and reflection can be received and swashed
Light beam, it becomes possible to measure the vapour concentration in light path without causing error；Further, since the common light of the laser beam of two kinds of wavelength
Road, therefore calculation error can be eliminated.
Need to draw attention to, above example is intended to indicate that the utility model, and unrestricted the utility model
Protection domain.In addition, to solve same technical problem, based on above-mentioned design principle, in knot disclosed in the utility model
On the basis of structure, that makes should be in protection domain of the present utility model without substantial improvement.
Claims (4)
1. a kind of humidity measuring instrument based on Difference Absorption technology, it is characterised in that：Including dual wavelength laser source module, receive
Luminescence Anneta module, synergic reflex device and signal detection processing module；
The dual wavelength laser source module includes laser driving circuit（3）, the laser A being connected electrically respectively（1）With
Laser B（2）, and respectively with laser A（1）With laser B（2）The optical fibre wavelength division multiplexer being connected（4）；
The transmitting-receiving optical antenna module includes being sequentially arranged optical fibre wavelength division multiplexer（4）The convex lens of front end（5）And window
Mirror（6）；
The synergic reflex device includes being arranged on window mirror（6）The light reflecting device of front end（8）；
The signal detection processing module includes signal-processing board（10）, and photodetector A coupled respectively（7）
With photodetector B（9）, the photodetector A（7）Receive window mirror（6）The laser signal of reflection, the photodetector
B（9）Receive light reflecting device（8）The laser signal of reflection, the signal-processing board（10）Also with laser driving circuit（3）Phase
Connection.
2. a kind of humidity measuring instrument based on Difference Absorption technology according to claim 1, it is characterised in that：It is described to swash
Light device A（1）To export the semiconductor laser that the wavelength of laser is equal to 1310nm, the laser B（2）To export the ripple of laser
The long semiconductor laser equal to 1370nm.
3. a kind of humidity measuring instrument based on Difference Absorption technology according to claim 1 or 2, it is characterised in that：Institute
State laser A（1）And/or laser B（2）For distributed feedback laser, and it is built-in with optoisolator, is externally provided with band refrigeration
14 pin butterfly shells, be single-mode tail fiber output.
4. a kind of humidity measuring instrument based on Difference Absorption technology according to claim 1, it is characterised in that：It is described convex
Lens（5）For aspherical lens, and its surface is coated with optical anti-reflective film.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621145517 | 2016-10-21 | ||
| CN2016211455170 | 2016-10-21 |
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| CN206515231U true CN206515231U (en) | 2017-09-22 |
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| CN201720155983.5U Active CN206515231U (en) | 2016-10-21 | 2017-02-21 | A kind of humidity measuring instrument based on Difference Absorption technology |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111175278A (en) * | 2020-01-19 | 2020-05-19 | 北京缔科新技术研究院(有限合伙) | Single photon humidity measuring functional sighting telescope |
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2017
- 2017-02-21 CN CN201720155983.5U patent/CN206515231U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111175278A (en) * | 2020-01-19 | 2020-05-19 | 北京缔科新技术研究院(有限合伙) | Single photon humidity measuring functional sighting telescope |
| CN111175278B (en) * | 2020-01-19 | 2023-05-23 | 北京缔科新技术研究院(有限合伙) | Single photon humidity measuring function sighting telescope |
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