CN106382987A - All-fiber laser heterodyne solar radiometer - Google Patents
All-fiber laser heterodyne solar radiometer Download PDFInfo
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- CN106382987A CN106382987A CN201610871890.2A CN201610871890A CN106382987A CN 106382987 A CN106382987 A CN 106382987A CN 201610871890 A CN201610871890 A CN 201610871890A CN 106382987 A CN106382987 A CN 106382987A
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- optical fiber
- heterodyne
- fiber
- optical
- actinometer
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- 239000000835 fiber Substances 0.000 title claims abstract description 18
- 239000013307 optical fiber Substances 0.000 claims abstract description 84
- 238000001228 spectrum Methods 0.000 claims abstract description 13
- 230000003287 optical effect Effects 0.000 claims abstract description 11
- 238000001514 detection method Methods 0.000 claims description 11
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 claims description 3
- 229910000661 Mercury cadmium telluride Inorganic materials 0.000 claims description 3
- MCMSPRNYOJJPIZ-UHFFFAOYSA-N cadmium;mercury;tellurium Chemical compound [Cd]=[Te]=[Hg] MCMSPRNYOJJPIZ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052738 indium Inorganic materials 0.000 claims description 3
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims description 3
- 230000003595 spectral effect Effects 0.000 abstract description 11
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 abstract 1
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000005855 radiation Effects 0.000 description 4
- 230000005457 Black-body radiation Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
Abstract
The invention discloses an all-fiber laser heterodyne solar radiometer. The parts for obtaining high signal-to-noise ratio heterodyne signals of the all-fiber laser heterodyne solar radiometer are a solar tracker (1), a first optical fiber (2), an optical fiber combiner (3), a second optical fiber (4), a high-speed heterodyne detector (6), a radio frequency processor (20), a phase-locked amplifier (19), an acquisition device (18), a chopper (21) and a computer (16) which are connected. The parts for providing local oscillating light and acquiring local oscillating light real-time output wavelength are a tunable narrow linewidth laser device (7), a third optical fiber (8), an optical fiber splitter (9), a fourth optical fiber (10), the optical fiber combiner (3), a fifth optical fiber (11), a beam splitter (12), an optical etalon (13), a photoelectric detector (15), the acquisition device (18), the computer (16) and a wavemeter (17) which are connected. The output end of the computer (16) is electrically connected with the tunable narrow linewidth laser device (7). The solar spectrum data of high spectral resolution can be quite easily and portably measured in real time.
Description
Technical field
The present invention relates to a kind of actinometer, especially a kind of full optical fiber laser heterodyne actinometer.
Background technology
The solar spectrum data of high spectral resolution is the significant data of research earth atmosphere, can be used for calculating the saturating of air
Cross Vertical Profile of rate, Atmospheric components etc..Spectral resolution due to solar spectrum signal has very to the precision of result of calculation
Big impact, therefore the acquisition to the solar spectrum data of high spectral resolution is pre- for earth atmosphere radiation, greenhouse effects, weather
The research of the aspects such as report has great significance.At present, as in June, 2006 goes out more than the conventional device of ground measurement solar spectrum
Version《Infrared》Direct solar radiation meter described in periodical volume 27 the 6th phase " actinometer " one literary composition.This direct sun
Radiometer is mainly made up of interconnective sun tracker, detector data processor；During measurement, detector is by the sun
The sun optical signal that tracks of device transmits is converted to electric signal, and is sent to data processor, calculates required data knot by it
Really.This direct solar radiation meter has the not high deficiency of resolution ratio of the solar spectrum of mensure.For obtaining high spectral resolution
The solar spectrum data of rate, also has using Fourier transform spectrometer；But this makes the sufficiently bulky of measuring apparatus and needs relatively
High power consumption, and longer time of measuring, pole is unfavorable for realizing the real-time measurement of high-resolution solar spectrum and measuring apparatus
Portable motor-driven application demand.
Content of the invention
The technical problem to be solved in the present invention is to overcome weak point of the prior art, provides one kind can record bloom
The solar spectrum data of spectral resolution, and small volume, full optical fiber laser heterodyne actinometer easy to use.
For solving the technical problem of the present invention, the technical scheme being adopted is：Full optical fiber laser heterodyne actinometer bag
Include the detector data processor being connected with sun tracker, particularly,
The output end of described sun tracker is connected with an input of optical-fiber bundling device through the first optical fiber, described optical fiber
The output end of bundling device is connected with high speed heterodyne detector through the second optical fiber, and described high speed heterodyne detector is successively through radio frequency processing
Device, lock-in amplifier, collector are electrically connected with data processor, the also chopped device of output end of described sun tracker and lock phase
Amplifier connects, for obtaining the heterodyne signal of high s/n ratio；
Described actinometer also contains tunable narrow-linewidth laser instrument, the output end of described tunable narrow-linewidth laser instrument
Be connected with the input of fiber optic splitter through the 3rd optical fiber, an output end of described fiber optic splitter through the 4th optical fiber with described
Another input of optical-fiber bundling device connects, and another output end of fiber optic splitter is through the 5th optical fiber, beam splitter, optics mark
Quasi- tool is connected with photodetector, and the acquired device of described photodetector is electrically connected with data processor, described beam splitter anti-
Penetrate and the wavemeter that its output end is electrically connected with data processor is equipped with light path, for providing local oscillator light and acquisition local oscillator light real-time
The wavelength of output；
Described data processor is computer, and its output end is electrically connected with the input of tunable narrow-linewidth laser instrument, uses
In the output of tuning narrow linewidth laser, and the heterodyne signal by the high s/n ratio obtaining and the local oscillator light obtaining output in real time
Wavelength draws spectrum in tuning range for the sunshine.
Improvement further as full optical fiber laser heterodyne actinometer：
Preferably, optical-fiber bundling device is middle infrared optical fiber bundling device.
Preferably, high speed heterodyne detector is mercury cadmium telluride high-speed photodetector, or indium gallium arsenic high-speed photodetector.
Preferably, it is equipped with the first condenser lens between the second optical fiber and high speed heterodyne detector；The precision detecting beneficial to lifting.
Preferably, rf processor contains bandpass filter and square law detector；In order to limiting circuit bandwidth and inspection
Survey signal power.
Preferably, tunable narrow-linewidth laser instrument is QCL, or interband cascade lasers, or near-infrared divides
Cloth feedback laser.
Preferably, the splitting ratio of fiber optic splitter is 98%：2%, wherein, 98% light is sent to optical-fiber bundling device.
Preferably, the splitting ratio of beam splitter is 30～70%：30～70%.
Preferably, it is equipped with the second condenser lens between optical standard tool and photodetector；The precision detecting beneficial to lifting.
Preferably, the first optical fiber, the second optical fiber, the 3rd optical fiber, the 4th optical fiber and the 5th optical fiber are hollow-core fiber；It is beneficial to
Reduce loss.
With respect to the beneficial effect of prior art it is：
After such structure, full optical fiber laser heterodyne actinometer both due to employing heterodyne detection mode, and
Drastically increase signal to noise ratio and the spectral resolution of measurement, make spectral resolution be up to 0.005cm-1, far above prior art
1cm-1；Also because optical fiber is employed on the coupling of light path, and employ optical-fiber bundling device and beam splitter carries out the coupling of light path,
Considerably reduce the volume of instrument and improve reliability of operation；More there is advantage low in energy consumption, that time of measuring is short；Make it
It is extremely easy to easily measure the solar spectrum data of high spectral resolution in real time.
Wherein, the mechanism that heterodyne detection of laser mode is realized is,
Flashlight (sunshine) and local oscillator light (laser), after bundling device carries out light coupling, are irradiated on photodetector
Detected by it.Photodetector is the detection to electric part in light field, and its response characteristic is square law relation, that is,：Light
Electric explorer output photoelectric current be proportional to electric field square.
It is assumed that two-beam is all monochromatic light, local oscillator light Elo=AlocosωloT, flashlight Es=Ascosωst.Photodetection
The electric current that device detects is output as：
I=α (Alocosωlot+Ascosωst)2(1)
Ignore high frequency item, then (1) formula is reduced to：
Wherein, direct current component is equivalent to idc=a (Plo+Ps), P thereinlO is the power of local oscillator light, PsFor flashlight
Power.Part III AloAscos(ωlo-ωs) t frequency be local oscillator light with the light frequency of flashlight difference on the frequency, this part is
For heterodyne signal.The size of heterodyne signal is proportional to the intensity of local oscillator light and flashlight, and heterodyne signal had both reflected local oscillator light institute
The information comprising also reflects the information that flashlight is comprised.When known to the state (intensity, wavelength, phase place etc.) of local oscillator light,
The information that flashlight is comprised just directly counter can be released by heterodyne signal.
When the energy of local oscillator light is much larger than the energy of flashlight, heterodyne detection is equivalent to using local oscillator light, flashlight to be entered
Go amplification.With respect to common direct detection mode, heterodyne detection mode is effectively improved the detection to small-signal light
Ability.
In the present patent application, using the sunshine through whole atmosphere as flashlight, the sunshine reaching earth's surface is permissible
It is equivalent to the black body radiation through GAS ABSORPTION.Different from the local oscillator light of narrow linewidth, black body radiation is a kind of broadband light, from ultraviolet
Suffer from stronger radiation to infrared band.With laser of narrowband for local oscillator light, broadband light is broadband in the heterodyne detection of flashlight
Light can be equivalent to the set of the monochromatic light wave train, and the signal obtained by heterodyne detection is that all monochromatic light form heterodyne with local oscillator light
Signal cumulative.Heterodyne signal is in that broadband is distributed on frequency domain, and the power spectral density on CF interval and corresponding optics are frequently
The power of the interval upper sunshine of rate is relevant.Measure the heterodyne signal power on this frequency separation it is possible to instead release corresponding
The power of the interval upper sunshine of optical frequency.From formula (2) it is known that the frequency of heterodyne signal with the optical frequency of local oscillator light is
Mutually one-to-one, so the bandwidth of heterodyne system is directly determined by the circuit bandwidth of heterodyne system, from suitable
Wave filter the bandwidth of heterodyne system can be limited in below 100MHz.
Brief description
Fig. 1 is a kind of basic structure schematic diagram of the present invention.
Fig. 2 is hydrone (H in the whole atmosphere being recorded using the present invention2) and methane (CH O4) molecule high-resolution inhale
Receive one of spectrogram, its spectral resolution has reached 0.003cm-1.
Specific embodiment
Below in conjunction with the accompanying drawings the preferred embodiment of the present invention is described in further detail.
Referring to Fig. 1 and Fig. 2, the composition of full optical fiber laser heterodyne actinometer is as follows：
The output end of sun tracker 1 is connected with an input of optical-fiber bundling device 3 through the first optical fiber 2, optical-fiber bundling
The output end of device 3 is connected with high speed heterodyne detector 6 through the second optical fiber 4, the first condenser lens 5, and wherein, optical-fiber bundling device 3 is
Middle infrared optical fiber bundling device, high speed heterodyne detector 6 be mercury cadmium telluride high-speed photodetector (or indium gallium arsenic high speed optoelectronic detect
Device)；High speed heterodyne detector 6 is electrically connected with data processor through rf processor 20, lock-in amplifier 19, collector 18 successively
Connect, wherein, rf processor 20 contains bandpass filter and square law detector；The output end of sun tracker 1 is also chopped
Device 21 is connected with lock-in amplifier 19, for obtaining the heterodyne signal of high s/n ratio.
Actinometer also contains tunable narrow-linewidth laser instrument 7；Wherein, tunable narrow-linewidth laser instrument 7 is quantum stage
Connection laser instrument (or interband cascade lasers, or near-infrared distributed feedback laser).The output of this tunable narrow-linewidth laser instrument 7
End is connected with the input of fiber optic splitter 9 through the 3rd optical fiber 8；One output end of fiber optic splitter 9 through the 4th optical fiber 10 with
Another input of optical-fiber bundling device 3 connects, another output end of fiber optic splitter 9 through the 5th optical fiber 11, beam splitter 12,
Optical standard is had the 13, second condenser lens 14 and is connected with photodetector 15, and wherein, the splitting ratio of fiber optic splitter 9 is 98%：
2%, therein 98% light is sent to optical-fiber bundling device 3；The acquired device 18 of photodetector 15 is electrically connected with data processor；Point
Bundle mirror 12 reflected light path on be equipped with the wavemeter 17 that its output end electrically connects with data processor, wherein, beam splitter 12 divide
Beam ratio is 50%:50% (can be 30～70%：30～70%)；For the ripple providing local oscillator light and obtain the output in real time of local oscillator light
Long.
Above-mentioned first optical fiber 2, the second optical fiber 4, the 3rd optical fiber 8, the 4th optical fiber 10 and the 5th optical fiber 11 are hollow-core fiber.
Data processor is computer 16, and its output end is electrically connected with the input of tunable narrow-linewidth laser instrument 7, is used for
The output of tuning narrow linewidth laser 7, and the output in real time of the local oscillator light of the heterodyne signal by the high s/n ratio obtaining and acquisition
Wavelength draws spectrum in tuning range for the sunshine.
During use, the sun tracker 1 being placed in open air locks the sun automatically, and by the sunshine receiving respectively through first
It is sent to lock-in amplifier 19 after optical fiber 2 feeding optical-fiber bundling device 3, chopped device 21.
The local oscillator light that tunable narrow-linewidth laser instrument 7 exports under the regulation and control of computer 16 sends into optical fiber through the 3rd optical fiber 8
After beam splitter 9, therein 98% part is sent into after optical-fiber bundling device 3, with sun optical coupling through the second light through the 4th optical fiber 10
Fine 4, first condenser lens 5 is sent in high speed heterodyne detector 6 and is carried out heterodyne detection；2% part is sent to through the 5th optical fiber 11
Beam splitter 12, the semi-gloss in 2% is reflexed to wavemeter 17 by beam splitter 12 again, second half gathers through optical standard tool 13, second
Focus lens 14 send into photodetector 15.The local oscillator light a reference value of wavemeter 17 output, optical standard tool 13 are through photodetector
The wavelength of local oscillator light output in real time after the local oscillator light exact value of 15 outputs is sent to computer 16, is calibrated out by computer 16.
The heterodyne electric signal of high speed heterodyne detector 6 output, after rf processor 20, obtains being proportional to this heterodyne telecommunications
The signal signal that the light intensity near this wavelength is directly proportional to sunshine of number intensity.This signal locks the reference letter of phase through it
After number lock-in amplifier 19 being provided by the chopper 21 being connected with sun tracker 1, that is, obtain the heterodyne letter of high s/n ratio
Number.
Computer 16 tunes the centre wavelength of local oscillator light, and the heterodyne by the wavelength of real-time for local oscillator light output and high s/n ratio
Signal corresponds, and has just obtained as or be similar to high-resolution spectroscopy in this tuning range for the sunshine shown in Fig. 2.
Obviously, those skilled in the art can carry out various changing to the full optical fiber laser heterodyne actinometer of the present invention
Move with modification without departing from the spirit and scope of the present invention.So, if these modifications and modification to the present invention belong to this
Within the scope of bright claim and its equivalent technologies, then the present invention is also intended to comprise these changes and modification.
Claims (10)
1. a kind of full optical fiber laser heterodyne actinometer, is processed including the detector data being connected with sun tracker (1)
Device it is characterised in that：
The output end of described sun tracker (1) is connected with an input of optical-fiber bundling device (3) through the first optical fiber (2), institute
The output end stating optical-fiber bundling device (3) is connected with high speed heterodyne detector (6) through the second optical fiber (4), described high speed heterodyne detection
Device (6) is electrically connected with data processor through rf processor (20), lock-in amplifier (19), collector (18) successively, described too
The also chopped device (21) of the output end of positive tracker (1) is connected with lock-in amplifier (19), for obtaining the heterodyne of high s/n ratio
Signal；
Described actinometer also contains tunable narrow-linewidth laser instrument (7), the output of described tunable narrow-linewidth laser instrument (7)
End is connected with the input of fiber optic splitter (9) through the 3rd optical fiber (8), and an output end of described fiber optic splitter (9) is through the
Four optical fiber (10) are connected with another input of described optical-fiber bundling device (3), another output end warp of fiber optic splitter (9)
5th optical fiber (11), beam splitter (12), optical standard tool (13) are connected with photodetector (15), described photodetector (15)
Acquired device (18) is electrically connected with data processor, the reflected light path of described beam splitter (12) is equipped with its output end and data
The wavemeter (17) of reason device electrical connection, for the wavelength providing local oscillator light and obtain the output in real time of local oscillator light；
Described data processor is computer (16), and its output end is electrically connected with the input of tunable narrow-linewidth laser instrument (7),
For tuning the output of narrow linewidth laser (7), and the local oscillator light of the heterodyne signal by the high s/n ratio obtaining and acquisition is real-time
The wavelength of output draws spectrum in tuning range for the sunshine.
2. full optical fiber laser heterodyne actinometer according to claim 1, is characterized in that optical-fiber bundling device (3) is red in being
Infrared optical fiber bundling device.
3. full optical fiber laser heterodyne actinometer according to claim 1, is characterized in that high speed heterodyne detector (6) is
Mercury cadmium telluride high-speed photodetector, or indium gallium arsenic high-speed photodetector.
4. full optical fiber laser heterodyne actinometer according to claim 1, is characterized in that the second optical fiber (4) is outer with high speed
It is equipped with the first condenser lens (5) between gap detector (6).
5. full optical fiber laser heterodyne actinometer according to claim 1, is characterized in that rf processor (20) contains
Bandpass filter and square law detector.
6. full optical fiber laser heterodyne actinometer according to claim 1, is characterized in that tunable narrow-linewidth laser instrument
(7) it is QCL, or interband cascade lasers, or near-infrared distributed feedback laser.
7. full optical fiber laser heterodyne actinometer according to claim 1, is characterized in that the beam splitting of fiber optic splitter (9)
Than for 98%：2%, wherein, 98% light is sent to optical-fiber bundling device (3).
8. full optical fiber laser heterodyne actinometer according to claim 1, is characterized in that the splitting ratio of beam splitter (12)
For 30～70%：30～70%.
9. full optical fiber laser heterodyne actinometer according to claim 1, is characterized in that optical standard tool (13) and light
It is equipped with the second condenser lens (14) between electric explorer (15).
10. full optical fiber laser heterodyne actinometer according to claim 1, is characterized in that the first optical fiber (2), the second light
Fine (4), the 3rd optical fiber (8), the 4th optical fiber (10) and the 5th optical fiber (11) are hollow-core fiber.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108489898A (en) * | 2018-02-10 | 2018-09-04 | 中国科学院合肥物质科学研究院 | Nearly mid-infrared laser wave band Transmissivity measurement system based on modulation of source technology |
| CN108593576A (en) * | 2018-06-12 | 2018-09-28 | 中国科学院上海技术物理研究所 | A kind of relevant detection meter of atmospheric greenhouse gas |
| CN111380834A (en) * | 2018-12-29 | 2020-07-07 | 中国科学院长春光学精密机械与物理研究所 | Passive infrared laser detection method and device |
| CN112345491A (en) * | 2020-10-22 | 2021-02-09 | 安庆师范大学 | All-fiber frequency division multiplexing wavelength modulation laser heterodyne detection system |
| CN112432914A (en) * | 2020-11-26 | 2021-03-02 | 中国科学院合肥物质科学研究院 | Passive infrared laser heterodyne detection device based on signal light narrow-band amplification technology |
| RU2753612C1 (en) * | 2020-05-25 | 2021-08-18 | федеральное государственное автономное образовательное учреждение высшего образования "Московский физико-технический институт (национальный исследовательский университет)" | Multichannel fiber-optic near-infrared heterodyne spectroradiometer |
| CN114184568A (en) * | 2021-11-04 | 2022-03-15 | 合肥学院 | All-fiber mid-infrared laser heterodyne radiometer system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108489898A (en) * | 2018-02-10 | 2018-09-04 | 中国科学院合肥物质科学研究院 | Nearly mid-infrared laser wave band Transmissivity measurement system based on modulation of source technology |
| CN108593576A (en) * | 2018-06-12 | 2018-09-28 | 中国科学院上海技术物理研究所 | A kind of relevant detection meter of atmospheric greenhouse gas |
| CN111380834A (en) * | 2018-12-29 | 2020-07-07 | 中国科学院长春光学精密机械与物理研究所 | Passive infrared laser detection method and device |
| RU2753612C1 (en) * | 2020-05-25 | 2021-08-18 | федеральное государственное автономное образовательное учреждение высшего образования "Московский физико-технический институт (национальный исследовательский университет)" | Multichannel fiber-optic near-infrared heterodyne spectroradiometer |
| CN112345491A (en) * | 2020-10-22 | 2021-02-09 | 安庆师范大学 | All-fiber frequency division multiplexing wavelength modulation laser heterodyne detection system |
| CN112432914A (en) * | 2020-11-26 | 2021-03-02 | 中国科学院合肥物质科学研究院 | Passive infrared laser heterodyne detection device based on signal light narrow-band amplification technology |
| CN114184568A (en) * | 2021-11-04 | 2022-03-15 | 合肥学院 | All-fiber mid-infrared laser heterodyne radiometer system |
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| CN106382987B (en) | 2017-10-31 |
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