CN103453997A - Broad-spectrum weak pulse laser energy measuring system - Google Patents
Broad-spectrum weak pulse laser energy measuring system Download PDFInfo
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- CN103453997A CN103453997A CN2013103977911A CN201310397791A CN103453997A CN 103453997 A CN103453997 A CN 103453997A CN 2013103977911 A CN2013103977911 A CN 2013103977911A CN 201310397791 A CN201310397791 A CN 201310397791A CN 103453997 A CN103453997 A CN 103453997A
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Abstract
The invention discloses a broad-spectrum weak pulse laser energy measuring system which is characterized by being composed of a measuring system probe, a rear end signal amplifying module and a computer with a data collecting card and Labview software. The measuring system probe is connected with the rear end signal amplifying module through a coaxial signal transmission line and a control line. The rear end signal amplifying module is connected with the computer through a data collecting cable. According to the broad-spectrum weak pulse laser energy measuring system, the scheme that pre-amplification and post-amplification are separated is adopted, pre-amplification has an automatic gear shifting function, and post-amplification has an automatic amplification time switching function. According to the broad-spectrum weak pulse laser energy measuring system, the wavelength responding range is wide, a short wavelength end is expanded to an X-ray waveband, and minimum energy detection can reach 10pJ. The broad-spectrum weak pulse laser energy measuring system is small in size and light in weight. The broad-spectrum weak pulse laser energy measuring system has important use value in the field of short wavelength weak energy measurement and the field of harmonic pulse energy measurement in higher harmonic tests.
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
The 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 the biology imaging, therefore the research of higher hamonic wave technology is very popular in the world today.
The 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 the 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 really is independent, the method for disperseing separately, seldom too much mentions the 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 the higher hamonic wave experiment, the harmonic signal measurement has following specific (special) requirements:
At first, needing the harmonic signal of measurement is pulsed laser signal.
Secondly, the 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 the 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; Be arranged on miniature precision electric motor because experiment needs energy meter or power meter probe the control that links, therefore also needing energy meter or energy gauge to pop one's head in weight can not be too large simultaneously.
For above specific (special) requirements, known product has deficiency in all many-sides at present:
At first, it is just that the 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, at 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 say 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 the signal light wavelength scope is extended to X ray, energy level is weak, the power meter volume is limited and the light source pulse characteristic issues when being detected, a kind of wide spectrum weak laser energy gauge is provided, and described measuring sonde also is 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 rearmounted the amplification has automatic switchover enlargement factor function.Response wave length wide ranges of the present invention, the shortwave long end has been extended to the 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 the energy measurement field a little less than the short wavelength, and the fields of measurement as harmonic pulse energy in the higher hamonic wave experiment, have important use value.In the occasion that relates to above-mentioned special characteristics, important using value is arranged.
The technology of the present invention solution is:
The faint pulsed laser energy measuring system of a kind of wide spectrum, its characteristics are this system by measuring system probe, back end signal amplification module and have data collecting card and the computer of Labview software forms, between described measuring system probe and back end signal amplification module, by the coaxial signal transmission line, with control line, be connected, connected by the 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 the setting photodiode, and dip plane is in the face of flashlight, the less end of bore closely is 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, No. 2 ports of described amplifier chip D3, D4, D5 respectively are 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; No. 5 ports of described amplifier chip D3, 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; No. 8 port ground connection of described amplifier chip D3, D4, D5; No. 2 ports of described analog multichannel switch chip D2, No. 10 ports connect respectively the positive pole of 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, comprise rearmounted amplifying circuit and BNC receiver port, and the output terminal of described BNC receiver port and the input end of described rearmounted amplifying circuit join.
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, the VN port is connected respectively with the VP port signal end and the shielding end that signal receives the BNC port; In described first order amplifying circuit, the 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, with two root lines in described data acquisition line concentration, join; 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, with described data acquisition line concentration, join.
The course of work of the present invention is:
(1) set probe positions, allow the light path central shaft overlap with the cone central shaft.
(2) start computer, open the 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 the 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 to introduce the problem that causes signal and noise to be difficult to differentiation of disturbing by probe in the post amplifier transmitting procedure;
The present invention adopts preposition amplification and the rearmounted scheme separately of amplifying, and described preposition amplification has automatic gear change function, and described rearmounted the amplification has automatic switchover enlargement factor function.This energy gauge range is set automatically, has automatic gear change function, without the user, manually adjusts, and pops one's head in like this and need not dismantle the 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 in the chamber of applicable finite volume and use;
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: the user can write voluntarily analysis, process other software modules by data that energy system obtains, thereby realizes controlling in real time and FEEDBACK CONTROL.
Response wave length wide ranges of the present invention, the shortwave long end has been extended to the 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 the energy measurement field a little less than the short wavelength, and the fields of measurement as harmonic pulse energy in the higher hamonic wave experiment, have important use value.
The 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, with control line 5, be connected, 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 comprised 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 end of bore is connected with described photodiode tight 102, the non-constant width of response spectrum scope of described photodiode 102, the 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, the 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, ADG1404 type multiway analog switch chip D2(annotates: this instructions chips port numbers is with consistent on chip official databook).No. 2 ports of described amplifier chip D3, D4, D5 respectively are 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 No. 4 port connection-5V of described amplifier chip D3, D4, D5, their No. 7 ports connect the positive pole of the power supply of 5V; The feedback resistance R7 two ends that resistance size is 3M Ω are in parallel with the filter capacitor C1 two ends of 10pf, in parallel after two ends connect respectively No. 2 ports and No. 6 ports of amplifier chip D3; The feedback resistance R8 two ends that resistance size is 20K Ω and two ends after the filter capacitor C2 two ends parallel connection of 10pf 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 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; No. 2 ports of described analog multichannel switch chip D2, No. 10 ports connect respectively the positive pole of 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 be 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 the diode response curve, and the marking current scope produced in estimating signal 10pJ～10uJ scope 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 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 the 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.
4 liang of end connectors of described coaxial signal transmission cable are all bnc interface, and an 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 the 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 ends connect pre-amplification circuit 103 analog multichannel switch D2 extends in rearmounted amplifying circuit, in order to merge and finally be connected with computer 3 by data acquisition line concentration 6 with rearmounted amplifying circuit control line.
Described rearmounted amplification module 2, include signal and receive BNC port 201, rearmounted amplifying circuit 202.Rearmounted amplification module be set be for mate computer 3 mileages according to capture card A/D gather voltage range (this example is selected the DAQPad-6016 of NI company type data collecting card, gather voltage range be ± 0.05V～± 10V), the raising 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 transmitted for receiver module 1.
Described rearmounted amplifying circuit 202, referring to Fig. 3, comprise 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, the VN port is connected respectively with the VP port signal end and the shielding end that signal receives BNC port 201; In described first order amplifying circuit 2021, the VOUT port connects isolation resistance R12023 mono-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 imported into through signal reception BNC port 201 obtains the 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; The one-level amplifying signal through obtaining the secondary amplifying signal after second level amplifying circuit amplifies again after isolation resistance R12023, 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, be equipped 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, gather voltage range to be ± 0.05V～± 10V, the DAQmx provided 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.
The 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; The 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 the 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 switching enlargement factor; The F value is respectively the process of each measurement corresponding to system in 0,1 o'clock and Application standard light source (energy and wavelength known luminaire) calibration, for various process F value initialization, is corresponding value.
After completing this step, perform step 2;
2, the judgement S 3 or A 2, whether set up:
If two conditions have an establishment, show the out-of-bounds of current test signal, exceed the measurement range, jump to step 12, finish this collection;
If two conditions all are false, perform 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
outv
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 the switching signal enlargement factor, after completing this step, performs 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 the one-level amplifying signal, stores the signal value of current collection simultaneously, in order to step 8, calculates and uses.
After completing this step, perform step 2.
8, use formula
Calculate the final signal current value.
In formula: G is the current enlargement factor of rearmounted amplifying circuit: during A=1, being first order enlargement factor, is that the two-stage enlargement factor is long-pending during A=2), R
fuse the feedback resistance of shelves for pre-amplification circuit is current, 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 the 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, perform 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, perform 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, perform step 12.
12, demonstration, event memory, finish this measurement.
It should be noted in the discussion above that this energy gauge need to be used the standard sources of 1nm～1100nm wave band to complete the storing process of conversion coefficient before executive signal is measured, use during in order to measurement.
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), with control line (5), be connected, 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 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, No. 2 ports of described amplifier chip D3, D4, D5 respectively are 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; No. 5 ports of described amplifier chip D3, 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; No. 8 port ground connection of described amplifier chip D3, D4, D5; No. 2 ports of described analog multichannel switch chip D2, No. 10 ports connect respectively the positive pole of 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), the VN port is connected respectively with the 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, with two root lines in described data acquisition line concentration (6), join; 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, with described data acquisition line concentration (6), join.
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| CN106908145A (en) * | 2017-02-27 | 2017-06-30 | 清华大学 | A kind of analogue type photo detector signal method for automatic measurement based on serial ports |
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| CN1614368A (en) * | 2004-10-09 | 2005-05-11 | 昆明理工大学 | Laser energy meter with quick responded and wide spectrum band impulsives |
| CN1740761A (en) * | 2005-09-27 | 2006-03-01 | 中国计量科学研究院 | Laser energy meter |
| CN101603859A (en) * | 2009-07-23 | 2009-12-16 | 北京理工大学 | A kind of little energy meter of burnt level laser that flies |
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