CN103777194B - A kind of modular photodetector response characteristic detection system - Google Patents
A kind of modular photodetector response characteristic detection system Download PDFInfo
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- CN103777194B CN103777194B CN201410034022.XA CN201410034022A CN103777194B CN 103777194 B CN103777194 B CN 103777194B CN 201410034022 A CN201410034022 A CN 201410034022A CN 103777194 B CN103777194 B CN 103777194B
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- 238000001514 detection method Methods 0.000 title claims abstract description 29
- 230000003287 optical effect Effects 0.000 claims abstract description 47
- 239000013307 optical fiber Substances 0.000 claims abstract description 12
- 238000001914 filtration Methods 0.000 claims description 7
- 230000008676 import Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 description 7
- 238000004088 simulation Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/497—Means for monitoring or calibrating
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
- G01S17/95—Lidar systems specially adapted for specific applications for meteorological use
Abstract
The present invention relates to a kind of modular photodetector response characteristic detection system, comprising: the first signal generator, the first digital oscilloscope, DC high-voltage power supply, secondary signal generator, the second digital oscilloscope, industrial computer, licel capture card, the first lens threaded sleeve, the second lens threaded sleeve, white point light source, first ring drive iris, the first collimation lens, double-deck runner bogey, optical filter, attenuator, the second ring driving iris, optical fiber, the second collimation lens, narrow band pass filter; First lens threaded sleeve has light inlet and light-emitting window, and first ring drives iris, the first collimation lens, optical filter, attenuator, the second ring drives iris coaxially to place along optical path direction, is nested in the first lens threaded sleeve; Second lens threaded sleeve has light inlet and light-emitting window, and the second collimation lens, narrow band pass filter are positioned at the second lens threaded sleeve, coaxially place along optical path direction; Licel capture card is connected with industrial computer.
Description
Technical field
The present invention relates to laser radar atmospheric exploration field, particularly one modular photodetector response characteristic detection system.
Background technology
The principle of atmospheric exploration laser radar is, a bundle of pulsed laser is launched by laser instrument, for exciting elastic scattering or the resonance fluorescence of air, its faint echo optical signal is collected by the receiving telescope on ground, again by high-sensitive photodetector (i.e. photomultiplier, PMT) convert echo light to electric signal, namely the power of this electric signal represents the relevant information of air.As can be seen here, PMT is that one of indispensable essential element of echo optical signal collected by laser radar, and particularly aerological sounding laser radar is amassed in high-power aperture, and it is faint for its echo auroral poles, can only detect in single photon detection mode.In order to obtain information and the result more accurately of higher atmospheric envelope section, usually adopt high-power pulsed laser and large aperture telescope as receiving trap, and adopt highly sensitive photomultiplier to improve detection height and precision.Large radar power product of areas (P × A), adds high-sensitive photomultiplier, is proposed very high requirement to the great dynamic range of electro-optical system, the rejection ability of bias light and detection stability.In these nearly hundred kilometers of air intervals, atmospheric density variation range is greater than 6 orders of magnitude, the echo optical signal strength range received far exceeds the dynamic range of photomultiplier (3-4 the order of magnitude), the nonlinear distortion question main manifestations caused is that pulse adds up effect and high light induced noise, affects result of detection accuracy.Therefore, want to realize the accurately detecting to upper atmosphere, first must solve the nonlinear distortion question that the strong echo photoconduction in low latitude causes photoelectricity acquisition system.
At present, Middle and upper atmosphere detecting laser radar Photodetection system also exists the problem of can'tting eat one's cake and have it between linear signal of limited dynamic range and follow-up data processing requirements on a large scale.International solution mainly contains the methods such as multi channel signals splicing, Electron door control, installation mechanical chopper, has significant effect for guarantee middle atmosphere linear signal (30-75km).But because the peak strength (i.e. sodium resonance fluorescence signal) of metal level signal (85-120km) is equivalent to 30km Rayleigh signal intensity, said method all effectively cannot solve the nonlinear distortion of metal level signal.
Summary of the invention
The object of the invention is to overcome that photodetector applicable surface of the prior art is narrow, reliability is lower, the repeated poor defect of testing result, thus a kind of modular photodetector response characteristic detection system is provided.
To achieve these goals, the invention provides a kind of modular photodetector response characteristic detection system, comprise: the first signal generator 101, first digital oscilloscope 102, DC high-voltage power supply 104, secondary signal generator 105, second digital oscilloscope 106, industrial computer 107, licel capture card 108, first lens threaded sleeve 201, second lens threaded sleeve 202, white point light source 301, first ring drives iris 302, first collimation lens 303, double-deck runner bogey 304, optical filter 305, attenuator 310, second ring drives iris 306, optical fiber 307, second collimation lens 308, narrow band pass filter 309, wherein,
Described secondary signal generator 105 synchronously triggers the first signal generator 101 and licel capture card 108, and synchronizing signal is inputted the second digital oscilloscope 106; First signal generator 101 pairs white point light source 301 is modulated, and synchronizing signal is shown in the first digital oscilloscope 102; Two end faces of described first lens threaded sleeve 201 have light inlet and light-emitting window, described first ring drives iris 302, first collimation lens 303, optical filter 305, attenuator 310, second ring to drive iris 306 coaxially to place successively along optical path direction, and being nested in described first lens threaded sleeve 201, optical filter 305 is wherein installed in described double-deck runner bogey 304 with attenuator 310; Two end faces of described second lens threaded sleeve 202 have light inlet and light-emitting window, and described second collimation lens 308, narrow band pass filter 309 are positioned at described second lens threaded sleeve 202, and coaxially place along optical path direction; Described licel capture card 108 is connected with described industrial computer 107.
In technique scheme, described two-layer wheel turns bogey 304 and comprises corresponding former and later two in position and take turns rotating disk, each wheel on rotating disk has multiple hole, and the multiple holes on a wheel rotating disk are for installing described optical filter 305, and another takes turns multiple holes on rotating disk for installing described attenuator 310; These two wheel rotating disks can each autorotation, and composition can respond different wave length, optical filter-attenuator combination of decay different light intensity.
In technique scheme, described first signal generator 101 adopts different delay times from secondary signal generator 105, wherein the first signal generator 101 produces pulse signal for modulating white point light source 301, and described secondary signal generator 105 is for Time delay; Described first signal generator 101 is 50 Ω with the work build-out resistor of secondary signal generator 105.
In technique scheme, described optical filter 305 for the light of specific wavelength in filtering incident light, its can filtering light wavelength coverage cover ultraviolet to infrared.
In technique scheme, described attenuator 310 is for changing the light intensity of incident light, and the range of light intensity of the light that described attenuator 310 can change covers 6 orders of magnitude.
In technique scheme, the pulse signal that described white point light source 301 sends is pulse square wave signal.
Present invention also offers a kind of detection method adopting described modular photodetector response characteristic detection system to realize, comprising:
Step 1), photomultiplier 103 to be measured is installed; Wherein,
Described photomultiplier to be measured 103 is placed in the second described lens threaded sleeve 202, after it is positioned at described narrow band pass filter 309 on optical path direction, and coaxially places along optical path direction with described second collimation lens 308, narrow band pass filter 309; Described DC high-voltage power supply 104 provides electric energy for photomultiplier 103 to be measured; The output terminal of photomultiplier 103 to be measured is directly connected with licel capture card 108 with the second digital oscilloscope 106 respectively;
Step 2), described secondary signal generator 105 synchronously triggers the first signal generator 101 and licel capture card 108, and synchronizing signal inputted described second digital oscilloscope 106;
The incident light that described white point light source 301 sends light intensity, pulsewidth, pulse repetition rate modulated by step 3), described first signal generator 101, and synchronizing signal is shown on the first digital oscilloscope 102;
Step 4), the incident light generated from white point light source 301 drive iris 302, first collimation lens 303 to become directional light through being coaxially placed on the first ring in the first lens threaded sleeve 201; Described directional light regulates its wavelength and light intensity successively via the optical filter 305 be arranged on double-deck runner bogey 304, attenuator 310;
Step 5), directional light after overregulating drive iris 306 to incide optical fiber 307 by the second ring, import the second threaded sleeve 202 through optical fiber 307; In described second threaded sleeve 202, incident light becomes directional light through the second collimation lens 308, again by the photocathode of the even incident photomultiplier 103 to be measured of narrow band pass filter 309, the anode output signal of photomultiplier 103 to be measured, the signal exported is by licel capture card 108 stored in industrial computer 107, and simultaneous display is to the second digital oscilloscope 106.
The invention has the advantages that:
Photomultiplier to be measured is directly connected with capture card by modular photodetector response characteristic detection system of the present invention, inside complicated between photomultiplier to be measured and capture card can be simplified respond, response curve exclusive between photomultiplier to be measured and capture card and distorted signals characteristic (high light induced noise SIN) can be detected simultaneously; The attenuator be arranged on double-deck runner bogey ensures the great dynamic range of incident light, and optical filter ensure that large spectral range; Two signal generators control luminescence-acquisition orders, can the upper fall time of accurate surveying pulse signal, any modulation point light source pulse parameter, and Reality simulation Received Signal, meets different testing laser radar photodetector response characteristic curve detection; Part of data acquisition selects licel capture card, is applicable to the PMT adopting simulation counting, photon counting; All optical elements are sealed in the threaded sleeve of customization, and light path imports with optical fiber, and console module degree is high, meet 3R principle (reappearance, portability, reliability).
Accompanying drawing explanation
Fig. 1 is modular photodetector response characteristic detection system schematic diagram;
Fig. 2 is the structural representation of double-deck runner bogey.
Accompanying drawing indicates
101 first signal generator 102 first digital oscilloscopes
103 photomultiplier 104 DC high-voltage power supply to be measured
105 secondary signal generator 106 second digital oscilloscopes
107 industrial computer 108licel capture cards
201 first lens threaded sleeve 202 second lens threaded sleeves
301 white point light source 302 first rings drive iris
The double-deck runner bogey of 303 first collimation lens 304
305 neutral colour filter 306 second rings drive iris
307 optical fiber 308 second collimation lenses
309 narrow band pass filter 310 attenuators
41 bayonet sockets
Embodiment
Now the invention will be further described by reference to the accompanying drawings.
With reference to figure 1, modular photodetector response characteristic detection system of the present invention comprises: the first signal generator 101, first digital oscilloscope 102, DC high-voltage power supply 104, secondary signal generator 105, second digital oscilloscope 106, industrial computer 107, licel capture card 108, first lens threaded sleeve 201, second lens threaded sleeve 202, white point light source 301, first ring drives iris 302, first collimation lens 303, double-deck runner bogey 304, optical filter 305, attenuator 310, second ring drives iris 306, optical fiber 307, second collimation lens 308, narrow band pass filter 309, wherein, the first signal generator 101 pairs white point light source 301 is modulated, and synchronizing signal is shown in the first digital oscilloscope 102, described first lens threaded sleeve 201 is right cylinder, its two sides, left and right has light inlet and light-emitting window, first ring drives iris 302, first collimation lens 303, optical filter 305, attenuator 310, second ring to drive iris 306 coaxially to place successively along optical path direction, and be nested in the first lens threaded sleeve 201, wherein optical filter 305 and attenuator 310 are installed in double-deck runner bogey 304, described second lens threaded sleeve 202 is right cylinder, and two sides, left and right has light inlet and light-emitting window, and the second collimation lens 308, narrow band pass filter 309 are positioned at described second lens threaded sleeve 202, and coaxially place along optical path direction, secondary signal generator 105 synchronously triggers the first signal generator 101 and licel capture card 108, and synchronizing signal is inputted the second digital oscilloscope 106, described licel capture card 108 is connected with industrial computer 107.
Below all parts in the present invention is further described.
Described first signal generator 101 adopts different delay times from secondary signal generator 105, and wherein the first signal generator 101 is responsible for modulation point light source and is produced pulse signal, secondary signal generator 105 responsible Time delays.As the preferred implementation of one, in the present embodiment, described first signal generator 101 is 50 Ω with the work build-out resistor of secondary signal generator 105, and in other embodiments, the work build-out resistor of signal generator also can change according to actual conditions.
Described first digital oscilloscope 102 and the second digital oscilloscope 106 are for the upper fall time of accurate surveying signal.
Described first lens threaded sleeve 201, second lens threaded sleeve 202 for closed optical path, to shield the interference of surround lighting.
Described optical filter 305 for the light of specific wavelength in filtering incident light, thus realizes the selection to incident light.Described attenuator 310 is for changing the light intensity of incident light.Described optical filter 305 is all arranged on two-layer wheel with attenuator 310 and turns on bogey 304.With reference to figure 2, described two-layer wheel turns bogey 304 and comprises corresponding former and later two in position and take turns rotating disk, each wheel on rotating disk has multiple hole, described optical filter 305 is installed by bayonet socket 41 in multiple holes on a wheel rotating disk, and described attenuator 310 is installed by bayonet socket 41 in another multiple holes of taking turns on rotating disk.Due to multiple optical filter or attenuator can be installed on a wheel rotating disk, therefore dissimilar optical filter or attenuator can be arranged in actual use on wheel rotating disk, thus realize to the filtering of different wave length incident light or with the light intensity changing incident light in various degree.Described two-layer wheel turns two wheel rotating disks on bogey 304 can each autorotation, thus realizes the selection to the multiple combination formula of lambda1-wavelength, light intensity, thus the photomultiplier to be measured of corresponding different response wave length, expand the range of application of detection system.In the present embodiment, described optical filter 305 can filtering light wavelength coverage cover ultraviolet to infrared, the range of light intensity of the light that described attenuator 310 can change covers 6 orders of magnitude.
Described white point light source 301 is for simulating incident light source, as everyone knows, in white light, include the light of different wave length, white light can be filtered into the light of different wave length by optical filter 5, thus the photomultiplier of corresponding different response wave length, expand the range of application of detection system.In the present embodiment, as the preferred implementation of one, pulse signal that described white point light source 301 sends adopts pulse square wave signal, is convenient to after square-wave signal terminates, detect under signal along after photoelectric tube residual attenuation signal.
Adopt photodetector response characteristic detection system of the present invention to treat and survey photomultiplier 103 when detecting, described photomultiplier to be measured 103 is placed in the second described lens threaded sleeve 202, after it is positioned at described narrow band pass filter 309 on optical path direction, and coaxially place along optical path direction with described second collimation lens 308, narrow band pass filter 309; Described DC high-voltage power supply 104 provides electric energy for photomultiplier 103 to be measured; The output terminal (anode) of photomultiplier 103 to be measured is directly connected with licel capture card 108 with the second digital oscilloscope 106 respectively.
Photodetector response characteristic detection system of the present invention treats that to survey photomultiplier 103 workflow carrying out detecting as follows:
Described secondary signal generator 105 synchronously triggers the first signal generator 101 and licel capture card 108, and synchronizing signal is inputted the second digital oscilloscope 106; The pulse square wave signal (i.e. incident light) that white point light source 301 sends special parameter (light intensity, pulsewidth, pulse repetition rate) modulated by described first signal generator 101, and synchronizing signal is shown on the first digital oscilloscope 102; The incident light generated from white point light source 301 drives iris 302, first collimation lens 303 to become directional light through being coaxially placed on the first ring in the first lens threaded sleeve 201; Described directional light regulates its wavelength and light intensity successively via the optical filter 305 be arranged on double-deck runner bogey 304, attenuator 310; Directional light after overregulating drives iris 306 to incide optical fiber 307 by the second ring, imports the second threaded sleeve 202 through optical fiber 307; In the second threaded sleeve 202, incident light becomes directional light through the second collimation lens 308, again by the photocathode of the even incident photomultiplier 103 to be measured of narrow band pass filter 309, the anode output signal of photomultiplier 103 to be measured, the signal exported is by licel capture card 108 stored in industrial computer 107, and simultaneous display is to the second digital oscilloscope 106.
Photodetector response characteristic detection system of the present invention is applicable to the photomultiplier adopting photon counting or simulation counting mode, has applicability widely.
It should be noted last that, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted.Although with reference to embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, modify to technical scheme of the present invention or equivalent replacement, do not depart from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (7)
1. a modular photodetector response characteristic detection system, it is characterized in that, comprise: the first signal generator (101), first digital oscilloscope (102), DC high-voltage power supply (104), secondary signal generator (105), second digital oscilloscope (106), industrial computer (107), licel capture card (108), first lens threaded sleeve (201), second lens threaded sleeve (202), white point light source (301), first ring drives iris (302), first collimation lens (303), double-deck runner bogey (304), optical filter (305), attenuator (310), second ring drives iris (306), optical fiber (307), second collimation lens (308), narrow band pass filter (309), wherein,
Described secondary signal generator (105) synchronously triggers the first signal generator (101) and licel capture card (108), and synchronizing signal is inputted the second digital oscilloscope (106); First signal generator (101) is modulated white point light source (301), and synchronizing signal is shown in the first digital oscilloscope (102); Two end faces of described first lens threaded sleeve (201) have light inlet and light-emitting window, described first ring drives iris (302), the first collimation lens (303), optical filter (305), attenuator (310), the second ring drives iris (306) coaxially to place successively along optical path direction, and being nested in described first lens threaded sleeve (201), optical filter (305) wherein and attenuator (310) are installed in described double-deck runner bogey (304); Two end faces of described second lens threaded sleeve (202) have light inlet and light-emitting window, described second collimation lens (308), narrow band pass filter (309) are positioned at described second lens threaded sleeve (202), and coaxially place along optical path direction; Described licel capture card (108) is connected with described industrial computer (107).
2. modular photodetector response characteristic detection system according to claim 1, it is characterized in that, described double-deck runner bogey (304) comprises corresponding former and later two in position and takes turns rotating disk, each wheel on rotating disk has multiple hole, multiple holes on a wheel rotating disk are for installing described optical filter (305), and another takes turns multiple holes on rotating disk for installing described attenuator (310); These two wheel rotating disks can each autorotation, and composition can respond different wave length, optical filter-attenuator combination of decay different light intensity.
3. modular photodetector response characteristic detection system according to claim 1, it is characterized in that, described first signal generator (101) adopts different delay times from secondary signal generator (105), wherein the first signal generator (101) produces pulse signal for modulating white point light source (301), and described secondary signal generator (105) is for Time delay; Described first signal generator (101) is 50 Ω with the work build-out resistor of secondary signal generator (105).
4. modular photodetector response characteristic detection system according to claim 1, it is characterized in that, described optical filter (305) for the light of specific wavelength in filtering incident light, its can filtering light wavelength coverage cover ultraviolet to infrared.
5. modular photodetector response characteristic detection system according to claim 1, it is characterized in that, described attenuator (310) is for changing the light intensity of incident light, and the range of light intensity of the light that described attenuator (310) can change covers 6 orders of magnitude.
6. modular photodetector response characteristic detection system according to claim 1, is characterized in that, the pulse signal that described white point light source (301) sends is pulse square wave signal.
7. the detection method adopting the described modular photodetector response characteristic detection system of one of claim 1-6 to realize, comprising:
Step 1), photomultiplier (103) to be measured is installed; Wherein,
Described photomultiplier to be measured (103) is placed in the second described lens threaded sleeve (202), after it is positioned at described narrow band pass filter (309) on optical path direction, and coaxially place along optical path direction with described second collimation lens (308), narrow band pass filter (309); Described DC high-voltage power supply (104) provides electric energy for photomultiplier to be measured (103); The output terminal of photomultiplier to be measured (103) is directly connected with licel capture card (108) with the second digital oscilloscope (106) respectively;
Step 2), described secondary signal generator (105) synchronously triggers the first signal generator (101) and licel capture card (108), and synchronizing signal inputted described second digital oscilloscope (106);
Step 3), described first signal generator (101) modulates the incident light that described white point light source (301) sends light intensity, pulsewidth, pulse repetition rate, and synchronizing signal is shown on the first digital oscilloscope (102);
Step 4), through being coaxially placed on, the first ring in the first lens threaded sleeve (201) drives iris (302), the first collimation lens (303) becomes directional light for the incident light that generated from white point light source (301); Described directional light regulates its wavelength and light intensity successively via the optical filter (305) be arranged on double-deck runner bogey (304), attenuator (310);
Step 5), directional light after overregulating drives iris (306) to incide optical fiber (307) by the second ring, imports the second lens threaded sleeve (202) through optical fiber (307); In described second lens threaded sleeve (202), incident light becomes directional light through the second collimation lens (308), again by the photocathode of the even incident photomultiplier to be measured (103) of narrow band pass filter (309), the anode output signal of photomultiplier to be measured (103), the signal exported is by licel capture card (108) stored in industrial computer (107), and simultaneous display is to the second digital oscilloscope (106).
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