CN203519172U - Wide-spectrum weak-pulse laser energy measuring system - Google Patents
Wide-spectrum weak-pulse laser energy measuring system Download PDFInfo
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- CN203519172U CN203519172U CN201320548173.8U CN201320548173U CN203519172U CN 203519172 U CN203519172 U CN 203519172U CN 201320548173 U CN201320548173 U CN 201320548173U CN 203519172 U CN203519172 U CN 203519172U
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Abstract
The utility model discloses a wide-spectrum weak-pulse laser energy measuring system. The wide-spectrum weak-pulse laser energy measuring system is characterized in that the system is composed of a measuring system probe, a rear end signal amplification module and a computer having a data acquisition card and a Labview software, the measuring system probe is connected with the rear end signal amplification module through a coaxial signal transmission line and a control line, and the rear end signal amplification module is connected with the computer through a data acquisition cable. A scheme that the preposition amplification and the postposition amplification are separately carried out is employed in the utility model, the preposition amplification has an automatic gear shifting function, and the postposition amplification has an amplification factor automatically switching function. The side-spectrum weak-pulse laser energy measuring system responds to wavelengths in a wide scope, and the short wavelength is expanded to the X-ray wave band. According to the utility model, the lowest energy of 10 pJ can be detected. The probe of the system is of small size and light weight. The side-spectrum weak-pulse laser energy measuring system has great using values in the short-wavelength weak-energy measuring field such as harmonic wave pulse energy measuring in a higher harmonic experiment.
Description
Technical field
The present invention relates to pulsed laser energy and measure, particularly the faint pulsed laser energy measuring system of a kind of wide spectrum.
Background technology
Higher hamonic wave technology is synthetic single Ah second (10
-18second) magnitude ultrashort pulse and the main experimental methods that produces water window wave section X ray, because the ultrashort pulse of single Ah's second-time can be used to study the motion of electronics in atom or molecule, and water window wave section X ray is having extremely important effect aspect biology imaging, therefore the research of higher hamonic wave technology is very popular in the world today.
Higher hamonic wave experiment relates to the measurement of harmonic signal, and general way is by X ray CCD(charge-coupled image sensor at present) or MCP(microchannel plate) measure.But the two has individual shortcoming, the signal intensity of acquisition is all the relative intensity between signal, and can not obtain absolute signal intensity.Both at home and abroad higher hamonic wave signal absolute strength being established a capital is really independent, the method for disperseing separately, seldom too much mentions concrete grammar details, and therefore the fields of measurement for higher hamonic wave signal absolute strength very makes up blank in the urgent need to a product.
In higher hamonic wave experiment, harmonic signal measurement has following specific (special) requirements:
First, needing the harmonic signal of measurement is pulsed laser signal.
Secondly, higher hamonic wave signal has covered deep UV to Soft X-Ray Region (121nm – 1nm).
Again, according to the strongest higher hamonic wave signal intensity of known report (document: E.Takahashi et al., Phys.Rev.A66,021802 (R) (2002)), be micro-Jiao (10
-6joule, joule be energy unit) magnitude, so the energy measurement scope of required energy meter or energy gauge is the highest just only has micro-burnt magnitude.
Finally, because higher hamonic wave experiment need to be carried out in vacuum chamber, due to the requirement of experiment vacuum tightness and cost, vacuum chamber can not be too large again, and free space is very limited; Simultaneously because experiment needs energy meter or power meter probe to be arranged on link on miniature precision electric motor controls, thus also need energy meter or energy gauge to pop one's head in weight can not be too large.
For above specific (special) requirements, known product has deficiency in all many-sides at present:
First, it is just that mJ(milli is burnt that energy is measured in current known invention (referring to patent CN200510105535.6, Sun Zhixu), 10
-3joule) magnitude, for feeble signal occasion inapplicable.
Secondly, current known invention (referring to patent CN200910089555.7, in Peng) can be measured faint energy, and measuring accuracy can reach 2.2fJ/cm
2～5
*105fJ/cm
2but, first this laser energy meter is outdoor application, not for using in vacuum chamber, secondly, this energy meter is mainly used in laser guidance, laser ranging field, and will make laser signal can in air, transmit long distance, the general infrared band that adopts, also just says that measuring wave band does not meet the requirement of X ray short-wave band yet.
Again, current known invention is (referring to patent CN200410040820.X, Zhang Pengxiang) its principal character is wide spectral range, pulsed, rapid response type energy meter, but know from patent document, it is 0.19～11 micron that this product is measured wave band, does not cover the measurement range of desired 121nm～1nm.
Summary of the invention
The present invention is intended to solve that above-mentioned signal light wavelength scope is extended to X ray, energy level is weak, power meter volume is limited and light source pulse characteristic issues when being detected, a kind of wide spectrum weak laser energy gauge is provided, and described measuring sonde is also provided with infundibulate cone and advance signal amplifying circuit.The present invention adopts preposition amplification and the rearmounted scheme separately of amplifying, and described preposition amplification has automatic gear change function, and described postposition amplification has automatic switchover enlargement factor function.Response wave length wide ranges of the present invention, shortwave long end has been extended to X ray wave band, and minimum energy of the present invention detects can reach 10pJ, and probe size of the present invention is small and exquisite, and weight is light.The present invention is energy measurement field a little less than short wavelength, and the fields of measurement as harmonic pulse energy in higher hamonic wave experiment, has important use value.In the occasion that relates to above-mentioned special characteristics, there is important using value.
The technology of the present invention solution is:
The faint pulsed laser energy measuring system of a kind of wide spectrum, its feature is this system by measuring system probe, back end signal amplification module and has data collecting card and the computer of Labview software forms, between described measuring system probe and back end signal amplification module, by coaxial signal transmission line, be connected with control line, connected by data acquisition cable between described back end signal amplification module and described computer.
Described measuring system probe comprises photodiode, pre-amplification circuit and the BNC signal derivation port of infundibulate cone successively, wide spectral response, the inside surface of described infundibulate cone has carried out blackening process, before being arranged on setting photodiode, and dip plane is in the face of flashlight, the less one end of bore is closely connected with described photodiode, and described photodiode (102) response wave length scope is 1nm～1100nm.
Described pre-amplification circuit, comprise AD549 type amplifier chip 3 D3, D4, D5, ADG1404 type multiway analog switch chip D2, described amplifier chip D3, No. 2 ports of D4, D5 are respectively connected in series shunt resistance R1, a R2, R3, and three shunt resistance R1, R2, the other end of R3 and the anodes of photodiode connect together; No. 3 ports of described amplifier chip D3, D4, D5 and the negative electrode of photodiode connect together and ground connection; Described amplifier chip D3, No. 5 ports of D4, D5 connect respectively No. 2 ports of slide rheostat R4, R5, R6, simultaneously No. 1 port of three slide rheostat R4, R5, R6 is connected with No. 1 port of amplifier chip D3, D4, D5 respectively, and No. 3 ports of three slide rheostat R4, R5, R6 are connected with No. 4 ports of amplifier chip D3, D4, D5 respectively; No. 4 ports of described amplifier chip D3, D4, D5 connect the negative pole of 5V power supply, and their No. 7 ports connect the positive pole of 5V power supply; The feedback resistance R7 two ends that resistance is 3M Ω and two ends after filter capacitor C1 two ends parallel connection are connected respectively No. 2 ports and No. 6 ports of amplifier chip D3; The feedback resistance R8 two ends that resistance is 20K Ω and two ends after filter capacitor C2 two ends parallel connection are connected respectively No. 2 ports and No. 6 ports of amplifier chip D4; The feedback resistance R9 two ends that resistance is 0.1K Ω and two ends after filter capacitor C3 two ends parallel connection are connected respectively No. 2 ports and No. 6 ports of amplifier chip D5; Described amplifier chip D3, No. 8 port ground connection of D4, D5; The positive pole that No. 2 ports of described analog multichannel switch chip D2, No. 10 ports connect respectively 15V power supply; No. 3 ports of described analog multichannel switch chip D2 connect the negative pole of 15V power supply; No. 7 ports of described analog multichannel switch chip D2, No. 12 ports, No. 13 ports, No. 14 ports, No. 9 port difference ground connection; No. 4 ports of described analog multichannel switch chip D2, No. 5 ports, No. 11 ports connect respectively No. 6 ports of amplifier chip D3, D4, D5; No. 1 port and No. 8 ports of described analog multichannel switch chip D2 are control port, connect described control line; No. 6 ports of described analog multichannel switch chip D2 are signal output port, and the signal port of deriving port with described BNC signal joins.
Described back end signal amplification module, comprises rearmounted amplifying circuit and BNC receiver port, and the input end of the output terminal of described BNC receiver port and described rearmounted amplifying circuit joins.
Described rearmounted amplifying circuit, comprise first order amplifying circuit, second level amplifying circuit, isolation resistance R1 and multiway analog switch chip, in described first order amplifying circuit, VN port is connected respectively with VP port signal end and the shielding end that signal receives BNC port; In described first order amplifying circuit, VOUT port connects isolation resistance R1, and the other end of this isolation resistance R1 connects the VIN port of second level amplifying circuit; No. 7 ports of described analog multichannel switch (2024), No. 9 ports, No. 11 ports, No. 12 ports, No. 13 ports, No. 14 port difference ground connection; No. 2 ports of described analog multichannel switch, No. 10 ports connect the positive pole of 15V power supply; No. 3 ports of described analog multichannel switch connect the negative pole of the power supply of 15V; No. 1 port, No. 8 ports of described analog multichannel switch are control port, join with two root lines in described data acquisition line concentration; No. 4 ports of described analog multichannel switch connect the VOUT port of first order amplifying circuit; No. 5 ports of described analog multichannel switch connect the VOUT port of second level amplifying circuit; No. 6 ports of described analog multichannel switch are signal output port, join with described data acquisition line concentration.
The course of work of the present invention is:
(1) set probe positions, allow light path central shaft overlap with cone central shaft.
(2) start computer, open Labview user software.
(3) open and treat photometry, allow irradiation to be measured pop one's head in.
(4) reading out data, access data from Labview user software.
Beneficial effect of the present invention is:
The non-constant width of photodiode response wavelength coverage that this energy gauge is used, can measure wavelength coverage is 1nm～1100nm;
It is 10pJ～10 μ J that this measuring system can be measured energy range;
This energy gauge adds adapting amplifier device in probe inside, has effectively avoided signal in post amplifier transmitting procedure, to introduce the problem that causes signal and noise to be difficult to differentiation of disturbing by popping one's head in;
The present invention adopts preposition amplification and the rearmounted scheme separately of amplifying, and described preposition amplification has automatic gear change function, and described postposition amplification has automatic switchover enlargement factor function.This energy gauge range is set automatically, has automatic gear change function, without user, manually adjusts, and pops one's head in like this and need not dismantle adjustment measurement range once installing;
This energy gauge adopts photoelectric method to measure, and removed the use of probe heat radiator from, thereby probe size is small and exquisite, weight is light, uses and is arranged on the limited accurate translation stage of load-carrying and use in the chamber of applicable finite volume;
This energy gauge data access and process and to carry out by computer, data read and secondary easy to use, functions expanding is strong.For example: user can write voluntarily analysis, process other software modules by data that energy system obtains, thereby realize, controls in real time and FEEDBACK CONTROL.
Response wave length wide ranges of the present invention, shortwave long end has been extended to X ray wave band, and minimum energy of the present invention detects can reach 10pJ, and probe size of the present invention is small and exquisite, and weight is light.The present invention is energy measurement field a little less than short wavelength, and the fields of measurement as harmonic pulse energy in higher hamonic wave experiment, has important use value.
Accompanying drawing explanation
Fig. 1 is system and device structural representation of the present invention.
Fig. 2 is pre-amplification circuit figure of the present invention.
Fig. 3 is the rearmounted amplification circuit diagram of the present invention.
Fig. 4 is user side Labview program work process flow diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further illustrated, but should not limit the scope of the invention according to this.
Please first consult Fig. 1, Fig. 1 is the faint pulsed laser energy measuring system of the wide spectrum of the present invention apparatus structure schematic diagram, as seen from the figure, the faint pulsed laser energy measuring system of the wide spectrum of the present invention, this system is by measuring system probe 1, back end signal amplification module 2 and have data collecting card and the computer of Labview software 3 forms, between described measuring system probe 1 and back end signal amplification module 2, by coaxial signal transmission line 4, be connected with control line 5, connected by data acquisition cable 6 between described back end signal amplification module 2 and described computer 3.
The described measuring system probe 1 infundibulate cone 101 comprising successively, the photodiode 102 of wide spectral response, pre-amplification circuit 103 and BNC signal are derived port one 04, the inside surface of described infundibulate cone 101 has carried out blackening process, before being arranged on setting photodiode 102, and dip plane is in the face of flashlight, the less one end of bore is connected with described photodiode tight 102, the non-constant width of response spectrum scope of described photodiode 102, significant response scope is 1nm～1100nm, model is the AXUV100G type photodiode that American I RD company (International Radiation Detectors) produces, this photodiode sensitivity is very high, be applicable to very much faint energy detection, specific performance index can be referring to official's databook.
Described preposition I～V amplifying circuit (103), physical circuit figure is referring to Fig. 2, comprise AD549 type amplifier chip 3 D3, D4, D5, an ADG1404 type multiway analog switch chip D2(note: this instructions chips port numbers is with consistent on chip official databook).Described amplifier chip D3, No. 2 ports of D4, D5 are respectively connected in series shunt resistance R1, a R2, R3, and the anode of three shunt resistance R1, R2, the R3 other end and photodiodes 102 connects together simultaneously; Described amplifier chip D3, D4, D5, the negative electrode of their No. 3 ports and photodiode 102 connects together and ground connection; Described amplifier chip D3, D4, D5, their No. 5 ports connect respectively slide rheostat R4, the R5 that an omnidistance resistance is 10K Ω, No. 2 ports of R6, simultaneously No. 1 port of three slide rheostat R4, R5, R6 is connected with No. 1 port of amplifier chip D3, D4, D5 respectively, and No. 3 ports of three slide rheostat R4, R5, R6 are connected with No. 4 ports of amplifier chip D3, D4, D5 respectively; The power supply of described amplifier chip D3, No. 4 port connection-5V of D4, D5, their No. 7 ports connect the positive pole of the power supply of 5V; A resistance size is that the feedback resistance R7 two ends of 3M Ω and the filter capacitor C1 two ends of 10pf are in parallel, and rear two ends in parallel connect respectively No. 2 ports and No. 6 ports of amplifier chip D3; A resistance size is No. 2 ports and No. 6 ports that after the feedback resistance R8 two ends of 20K Ω and the filter capacitor C2 two ends parallel connection of 10pf, two ends are connected respectively amplifier chip D4; The feedback resistance R9 two ends that resistance is 0.1K Ω and two ends after the filter capacitor C3 two ends parallel connection of 10pf are connected respectively No. 2 ports and No. 6 ports of amplifier chip D5; Described amplifier chip D3, D4, D5, their No. 8 port ground connection; The positive pole that No. 2 ports of described analog multichannel switch chip D2, No. 10 ports connect respectively 15V power supply; No. 3 ports of described analog multichannel switch chip D2 connect the negative pole of the power supply of 15V; No. 7 ports of described analog multichannel switch chip D2, No. 12 ports, No. 13 ports, No. 14 ports, No. 9 port difference ground connection; No. 4 ports of described analog multichannel switch chip D2, No. 5 ports, No. 11 ports connect respectively No. 6 ports of amplifier chip D3, D4, D5; No. 1 port and No. 8 ports of described analog multichannel switch chip D2 are control port, welding control line 5; No. 6 ports of described analog multichannel switch chip D2 are signal output port, and welding BNC signal is derived the signal port of port one 04.
The weak current signal being transformed by photodiode 102 is divided into 3 tunnels by 3 100 Ω shunt resistance R1, R2, R3, and enter respectively 3 amplifier D3, D4, D5, the voltage signal of 3 amplifiers output corresponds respectively to marking current 10nA～1uA, 1uA～100uA, the 100uA～10mA(of third gear range by diode response curve, and estimating signal 10pJ～10uJ within the scope of, the marking current scope of generation is: 10nA～10mA).Third gear range signal is connected to respectively 4,5, No. 11 ports of analog multichannel switch D2 through D3, D4, No. 6 output ports of D5 amplifier, output to No. 6 port outputs of analog multichannel switch D2 in order to gating.The concrete gating of third gear range signal which determine to analog multichannel switch Control Line digital signal by control line 5.In preposition I～V amplifying circuit 103, C1, C2, C3 electric capacity are for filtering, and slide rheostat R1, R2, R3 are used for regulating D3, D4, the biasing of D5 amplifier, and concrete control method can be referring to official of AD company databook.
The signal that probe is selected is derived port one 04 for BNC port, signal is derived the signal end of port one 04 and shielding end and is welded on respectively measuring system and pops one's head on the OUT port and ground wire of 1 pre-amplification circuit 103, the coaxial signal transmission line 4 of other end connecting band BNC head, to resist to greatest extent the undesired signal in environment.
Described 4 liang of end connectors of coaxial signal transmission cable are all bnc interface, and one end connects the BNC signal of measuring system probe 1 derives port one 04, and the other end connects the signal input port 201 of postsignal amplification module 2.Adopt coaxial signal transmission cable can suppress preferably the undesired signal in environment, improve signal to noise ratio (S/N ratio).
The Control Line other end that described control line 5 one end connect pre-amplification circuit 103 analog multichannel switch D2 extends in rearmounted amplifying circuit, to merge and be finally connected with computer 3 by data acquisition line concentration 6 with rearmounted amplifying circuit control line.
Described rearmounted amplification module 2, includes signal and receives BNC port 201, rearmounted amplifying circuit 202.It is to gather voltage range (this example is selected the DAQPad-6016 of NI company type data collecting card, gathers voltage range to be ± 0.05V～± 10V) in order to mate 3 li of data collecting card A/D of computer that rearmounted amplification module is set, and improves acquisition precision.
Described signal receives BNC port 201, and signal end and shielding end are welded on respectively VN end and VP end on rearmounted amplifying circuit 202, the voltage signal transmitting for receiver module 1.
Described rearmounted amplifying circuit 202, referring to Fig. 3, comprises 2022, one isolation resistance R12023 of 2021, second level amplifying circuits of a first order amplifying circuit, a multiway analog switch chip 2024 that model is ADG1404.Described first order amplifying circuit 2021 and second level amplifying circuit 2022 are taken from the application of document 1(electronic devices and components, design and the realization of burst pulse small-signal operational amplification circuit, Yin Li etc., 2011.9) first order amplifying circuit and second level amplifying circuit scheme in; In described first order amplifying circuit 2021, VN port, VP port, VOUT port are respectively corresponding to first order amplifying circuit Vn port, Vp port, Vout port in document 1; In described second level amplifying circuit 2022, VIN port, VOUT port are respectively corresponding to second level amplifying circuit Vin port, Vout port in document 1; In described first order amplifying circuit 2021, VN port is connected respectively with VP port signal end and the shielding end that signal receives BNC port 201; In described first order amplifying circuit 2021, VOUT port connects isolation resistance R12023 one end, and the other end of isolation resistance R12023 connects the VIN port of second level amplifying circuit 2022; No. 7 ports of described analog multichannel switch 2024, No. 9 ports, No. 11 ports, No. 12 ports, No. 13 ports, No. 14 port difference ground connection; No. 2 ports of described analog multichannel switch 2024, No. 10 ports connect the positive pole of 15V power supply; No. 3 ports of described analog multichannel switch 2024 connect the negative pole of the power supply of 15V; No. 1 port, No. 8 ports of described analog multichannel switch 2024 are control port, two root lines in welding data collecting line 6; No. 4 ports of described analog multichannel switch 2024 connect the VOUT port of first order amplifying circuit 2021; No. 5 ports of described analog multichannel switch 2024 connect the VOUT port of second level amplifying circuit 2022; No. 6 ports of described analog multichannel switch 2024 are a root line in signal output port welding data collecting line 6.
The signal importing into through signal reception BNC port 201 obtains one-level amplifying signals through first order amplifying circuit 2021, and this example first order amplifying circuit enlargement factor is set to G
1=3; One-level amplifying signal obtains secondary amplifying signal again after isolation resistance R12023 after second level amplifying circuit amplifies, and this example second level amplifying circuit enlargement factor is set to G
2=10, be also that one-level amplifying signal enlargement factor is G=G
1, secondary amplifying signal enlargement factor is G=G
1g
2; Then one-level amplifying signal and secondary amplifying signal access respectively gating port 4 and No. 5 ports of multiway analog switch (2024), in order to multiway analog switch 2024 control end Control Line gating outputs.
One end of described data acquisition line concentration 6 connects data collecting card in computer module (3); Each sub-line of the other end connects respectively control line 5, analog multichannel switch 2024 No. 1 port, No. 8 ports, No. 6 ports in rearmounted amplifying circuit, rearmounted amplifying circuit 202 ground wires.
Described computer module 3, is provided with data collecting card and the Labview program (software version number is 8.6.1) of usb bus interface type.Data collecting card is selected the DAQPad-6016 of NI company, and this data collecting card precision is 16, gathers voltage range to be ± 0.05V～± 10V, and the DAQmx providing by official drives and realizes communicating by letter between data collecting card and computing machine Labview program.
For clearer self shifter of the present invention and automatic enlargement factor handoff procedure, next Labview user program flow process is introduced.
Please refer to Fig. 4, this figure is Labview program work process flow diagram of the present invention, comprises the following steps:
1, initialization and process choosing.
Initialization: S=1, A=1, V
min=0.3, V
max=3, V
store=0.Process choosing comprises measuring process and calibration process, if measuring process F=0, if calibration process F=1.
S value is respectively 1,2,3 o'clock, and each is respectively 3M Ω, 20K Ω, 100 Ω shelves corresponding to preposition amplification feedback resistance; A value is respectively 1,2 o'clock, and each is output as one-level amplifying signal and secondary amplifying signal corresponding to rearmounted amplifying circuit; V
storefor buffer memory magnitude of voltage, for calculating net result; V
minand V
maxbe respectively the effective minimum value of collection signal and maximal value, be used for demarcating pre-amplification circuit gearshift and rearmounted amplifying circuit and switch enlargement factor; F value is respectively each measurement corresponding to system in 0,1 o'clock and uses the process of standard sources (energy and wavelength known luminaire) calibration, for various process F value initialization, is corresponding value.
Complete after this step execution step 2;
Whether 2, judgement S>3 or A>2, set up:
If two conditions have an establishment, show the out-of-bounds of current test signal, exceed measurement range, jump to step 12, finish this collection;
If two conditions are all false, execution step 3;
3, the final voltage signal values V of data collecting card collection
out.
4, judgement V
out<V
minwhether set up:
If condition is true, jump to step 6;
If condition is false, perform step 5;
5, judgement V
out>V
maxwhether set up:
If condition is true, jump to step 7;
If condition is false, perform step 8;
6, A=A+1, also postposition is amplified switching signal enlargement factor, completes after this step execution step 2.
7, S=S+1; While A=1; Storage V
outvalue, V
store=V
out;
That is to say that pre-amplification circuit switches to next shelves, rearmounted amplifying circuit output is initialized as one-level amplifying signal, stores the signal value of current collection simultaneously, in order to step 8, calculates and uses.
Complete after this step execution step 2.
8, use formula
calculate final signal current value.
In formula: G is the current enlargement factor of rearmounted amplifying circuit: being the first order enlargement factor during A=1, is that two-stage enlargement factor is long-pending during A=2), R
ffor pre-amplification circuit is current, use the feedback resistance of shelves, C is conversion coefficient (using first grade of this value of pre-amplification circuit is 3, and using this value of second gear is 2, and using this value of third gear is 1), V
storefor buffer memory magnitude of voltage, G1 is rearmounted amplifying circuit first order enlargement factor, R
f' be the current feedback resistance that uses upper one grade of shelves of pre-amplification circuit.
Execute this step, execution step 9.
9, judge whether F=0 sets up.
If condition is set up, perform step 11.
If condition is false, perform step 10.
10, calculate conversion coefficient T (λ).
Computing formula is:
wherein E0 (λ) is the energy value size of the wavelength standard sources that is λ, and I is the current value size that step 8 calculates.
Execute this step, execution step 12.
11, calculate the energy value E (λ) of this measurement.
Computing formula is: E (λ)=T (λ) I,
Wherein, T (λ) is the flashlight conversion coefficient that the wavelength of storage is λ, and I is the current value size that step 8 calculates.
Execute this step, execution step 12.
12, demonstration, event memory, finish this measurement.
It should be noted in the discussion above that before executive signal is measured, this energy gauge need to be used the standard sources of 1nm～1100nm wave band to complete the storing process of conversion coefficient, during in order to measurement, uses.
Claims (5)
1. the faint pulsed laser energy measuring system of wide spectrum, it is characterized in that this system by measuring system probe (1), back end signal amplification module (2) and there is data collecting card and the computer of Labview software (3) forms, between described measuring system probe (1) and back end signal amplification module (2), by coaxial signal transmission line (4), be connected with control line (5), connected by data acquisition cable (6) between described back end signal amplification module (2) and described computer (3).
2. the faint pulsed laser energy measuring system of wide spectrum according to claim 1, it is characterized in that described measuring system probe (1) comprises infundibulate cone (101) successively, the photodiode of wide spectral response (102), pre-amplification circuit (103) and BNC signal are derived port (104), the inside surface of described infundibulate cone (101) has carried out blackening process, be arranged on and set photodiode (102) before, and dip plane is in the face of flashlight, the less one end of bore is connected with described photodiode tight (102), described photodiode (102) response wave length scope is 1nm～1100nm.
3. the faint pulsed laser energy measuring system of wide spectrum according to claim 2, it is characterized in that described pre-amplification circuit (103), comprise AD549 type amplifier chip 3 D3, D4, D5, ADG1404 type multiway analog switch chip D2, described amplifier chip D3, No. 2 ports of D4, D5 are respectively connected in series shunt resistance R1, a R2, R3, and three shunt resistance R1, R2, the other end of R3 and the anodes of photodiode (102) connect together; No. 3 ports of described amplifier chip D3, D4, D5 and the negative electrode of photodiode (102) connect together and ground connection; Described amplifier chip D3, No. 5 ports of D4, D5 connect respectively No. 2 ports of slide rheostat R4, R5, R6, simultaneously No. 1 port of three slide rheostat R4, R5, R6 is connected with No. 1 port of amplifier chip D3, D4, D5 respectively, and No. 3 ports of three slide rheostat R4, R5, R6 are connected with No. 4 ports of amplifier chip D3, D4, D5 respectively; No. 4 ports of described amplifier chip D3, D4, D5 connect the negative pole of 5V power supply, and their No. 7 ports connect the positive pole of 5V power supply; The feedback resistance R7 two ends that resistance is 3M Ω and two ends after filter capacitor C1 two ends parallel connection are connected respectively No. 2 ports and No. 6 ports of amplifier chip D3; The feedback resistance R8 two ends that resistance is 20K Ω and two ends after filter capacitor C2 two ends parallel connection are connected respectively No. 2 ports and No. 6 ports of amplifier chip D4; The feedback resistance R9 two ends that resistance is 0.1K Ω and two ends after filter capacitor C3 two ends parallel connection are connected respectively No. 2 ports and No. 6 ports of amplifier chip D5; Described amplifier chip D3, No. 8 port ground connection of D4, D5; The positive pole that No. 2 ports of described analog multichannel switch chip D2, No. 10 ports connect respectively 15V power supply; No. 3 ports of described analog multichannel switch chip D2 connect the negative pole of 15V power supply; No. 7 ports of described analog multichannel switch chip D2, No. 12 ports, No. 13 ports, No. 14 ports, No. 9 port difference ground connection; No. 4 ports of described analog multichannel switch chip D2, No. 5 ports, No. 11 ports connect respectively No. 6 ports of amplifier chip D3, D4, D5; No. 1 port and No. 8 ports of described analog multichannel switch chip D2 are control port, connect described control line (5); No. 6 ports of described analog multichannel switch chip D2 are signal output port, and the signal port of deriving port (104) with described BNC signal joins.
4. the faint pulsed laser energy measuring system of wide spectrum according to claim 1, it is characterized in that described back end signal amplification module (2), comprise rearmounted amplifying circuit (202) and BNC receiver port (201), the input end of the output terminal of described BNC receiver port (201) and described rearmounted amplifying circuit (202) joins.
5. the faint pulsed laser energy measuring system of wide spectrum according to claim 4, it is characterized in that described rearmounted amplifying circuit (202), comprise first order amplifying circuit (2021), second level amplifying circuit (2022), isolation resistance R1(2023) and multiway analog switch chip (2024), in described first order amplifying circuit (2021), VN port is connected respectively with VP port signal end and the shielding end that signal receives BNC port (201); VOUT port connection isolation resistance R1(2023 in described first order amplifying circuit (2021)), the other end this isolation resistance R1(2023) connects the VIN port of second level amplifying circuit (2022); No. 7 ports of described analog multichannel switch (2024), No. 9 ports, No. 11 ports, No. 12 ports, No. 13 ports, No. 14 port difference ground connection; No. 2 ports of described analog multichannel switch (2024), No. 10 ports connect the positive pole of 15V power supply; No. 3 ports of described analog multichannel switch (2024) connect the negative pole of the power supply of 15V; No. 1 port, No. 8 ports of described analog multichannel switch (2024) are control port, join with two root lines in described data acquisition line concentration (6); No. 4 ports of described analog multichannel switch (2024) connect the VOUT port of first order amplifying circuit (2021); No. 5 ports of described analog multichannel switch (2024) connect the VOUT port of second level amplifying circuit (2022); No. 6 ports of described analog multichannel switch (2024) are signal output port, join with described data acquisition line concentration (6).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320548173.8U CN203519172U (en) | 2013-09-04 | 2013-09-04 | Wide-spectrum weak-pulse laser energy measuring system |
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| CN201320548173.8U CN203519172U (en) | 2013-09-04 | 2013-09-04 | Wide-spectrum weak-pulse laser energy measuring system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103453997A (en) * | 2013-09-04 | 2013-12-18 | 中国科学院上海光学精密机械研究所 | Broad-spectrum weak pulse laser energy measuring system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103453997A (en) * | 2013-09-04 | 2013-12-18 | 中国科学院上海光学精密机械研究所 | Broad-spectrum weak pulse laser energy measuring system |
| CN103453997B (en) * | 2013-09-04 | 2016-09-21 | 中国科学院上海光学精密机械研究所 | Wide spectrum weak pulse measurement of laser energy system |
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