CN101776478B - Wide-waveband multi-range high-precision low-power consumption portable laser power meter - Google Patents
Wide-waveband multi-range high-precision low-power consumption portable laser power meter Download PDFInfo
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- CN101776478B CN101776478B CN2009102734422A CN200910273442A CN101776478B CN 101776478 B CN101776478 B CN 101776478B CN 2009102734422 A CN2009102734422 A CN 2009102734422A CN 200910273442 A CN200910273442 A CN 200910273442A CN 101776478 B CN101776478 B CN 101776478B
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Abstract
The invention discloses a wide-waveband multi-range high-precision low-power consumption portable laser power meter and relates to a laser power meter in the technical field of laser measurement and communication. The laser power meter comprises a magnetic-shielding metal case 0 and a laser receiving probe 1, wherein an operation panel of the magnetic-shielding metal case 0 is provided with operation and display parts and a functional circuit is arranged in the magnetic-shielding metal case 0; and the laser receiving probe 1, a BNC input interface 2, a front amplifying circuit 5, a zeroing circuit 7, a wavelength set mode switching circuit 10 and a wavelength compensating circuit 12 are connected in sequence, the wavelength compensating circuit 12 is connected with a liquid crystal voltmeter 14 and an analogue communication BNC output interface 15 respectively, and thus, the laser power measurement is realized. The laser power meter has the advantages of wide wavelength application scope, large power measurement scope, high measurement precision, fast response, multiple power supply modes, lower power consumption, small size, light weight, communication and low cost.
Description
Technical field
The present invention relates to the laser powermeter in laser measurement and the communication technical field, relate in particular to a kind of wide-waveband multi-range high-precision low-power consumption portable laser power meter; Can be widely used in each fields relevant such as physics, chemistry, optics, biology, machinery with laser.
Background technology
People such as the nineteen sixty U.S. physicist many Mei Man in Theo develop first ruby laser; People such as Jia Wan had processed helium-neon laser in 1961; 1962 suddenly people such as ear invented the gallium arsenide semiconductor laser instrument, scientists in 1966 has been developed into the organic dye laser that wavelength can be regulated continuously again in a segment limit; After this development of laser instrument is more and more faster, and kind is more and more, and it is also more and more wider to cover wave band.Since all outstanding features that laser instrument possesses, thereby applied to each side such as industry, agricultural, precision measurement, machining, communication and information processing, medical treatment, military affairs very soon, and caused revolutionary breakthrough in a lot of fields.
Along with laser produces and the development of application technology, increasingly high requirement has been proposed also for the measurement of laser technology parameter.As everyone knows, the power of laser (light intensity) is one of most important technical parameter of laser/laser instrument.Not only the absolute watt level of laser is paid close attention to by everybody extensively, and in a lot of most advanced and sophisticated scientific research and technical fields, and the degree of stability of laser power is also had very high requirement.This just needs the instrument of Laser Measurement power to have very high degree of accuracy and accuracy simultaneously.
At present the receiving transducer of laser powermeter is two kinds of thermoelectric pile formula and semiconductor-types.Thermoelectric pile formula probe utilizes the thermal effect of laser, draws measurement result thereby heat energy is changed into electric energy.Its advantage is that the absolute measurement result does not change with the change of optical maser wavelength, but its fatal shortcoming is arranged is exactly when the low light level of milliwatt level is measured, flowing of the fluctuating of environment temperature even air all can cause very big disturbance to measurement result.These characteristics have determined it can't reach very high measuring accuracy and accuracy.Another kind of semiconductor-type probe is to utilize the photovoltaic effect on the semiconductor PN joint that luminous energy is converted into electric signal.This principle of work makes it break away from environment and rises and falls to the disturbance of measurement result, thereby can reach very high measuring accuracy and accuracy.But because the entrained energy difference of the single photon of different wave length/frequency, this has just caused it that different wavelength of laser is had different response characteristics and sensitivity.So need in circuit, increase a compensating unit, proofread and correct its nonlinear response to different wave length.
All there is following technological deficiency in present semiconductor light power meter in varying degrees:
1, operation wavelength single or switch inconvenience and measurement range narrow: because the electric current/luminous power characteristic of photodiode changes with wavelength, so most power is counted the single wavelength mode of operation or switched in several specific wavelengths through resistor chain.Versatility is very poor and switch very inconvenient.Present in addition semiconductor laser power meter all adopts single probe to come work, and the probe of processing with any semiconductor material at present all has certain working range, generally is merely 0.6～0.7 μ m.
2, range is single or coarse: because the noise and the performance limitations of optical device and electrical part, deviation can be very big when to use range be the power of power meter measurement milliwatt level laser of watt level, and the power of measurement microwatt level laser then can't be realized at all.And present laser powermeter generally has only single or two or three ranges.Can't solve the contradiction between measurement range and the measuring accuracy at all.
3, zeroing mechanism shortcoming: because photodiode (photoelectric cell) more or less all have certain dark current; Also all there is input bias current in all electronic components such as operational amplifier, and the light in the measurement environment (like the daylight on daytime and the light at night) all can increase the skew of a direct current on the result who measures.If lack mechanism or the imperfection of zeroing then carry out bringing very big deviation can for the result who measures when the low light level is measured.
4, powering mode is single: be mostly the power supply of external DC power supply or internal battery.Single external DC power supply can make power meter forfeiture portability and movability; Single internal battery power supply can make the continuity of measuring process and reliability not ensure.
5, shortage and other acquisition controlling compatibility of apparatus: present light power meter generally only provides LCDs as display terminal, and the port of communicating by letter with miscellaneous equipment.Put to no little inconvenience for like this robotization of total system acquisition controlling.
At present China domestic does not still have have the continuous wavelength compensation simultaneously, zeroing, multirange large-range measuring, the power meter patented product of simulating functions such as output, so the whole dependence on import of the application of high-precision laser power meter.And a large amount of use single-chip microcomputer of external product, the A/D conversion comprises that digital display portion all is that single-chip microcomputer is controlled.The working method of soft or hard combination has greatly increased the labile factor of product on the one hand, has also increased very many production costs on the other hand.
Summary of the invention
The objective of the invention is to overcome the shortcoming and defect that prior art exists; A kind of wide-waveband multi-range high-precision low-power consumption portable laser power meter is provided; It is single to have solved existing laser powermeter operation wavelength, range, powering mode; Problems such as no zeroing mechanism and extensibility have better generality, compatibility, reliability, and higher measuring accuracy.
The objective of the invention is to realize like this:
Testing laser is through decay; By photodiode receive transfer photocurrent to after; Change into voltage signal through pre-amplification circuit, transfer the magnitude of voltage of representing true luminous power to through wavelength compensation circuit and zeroing circuit again, export that voltage table shows to or export by the analogue communication interface; Total system is changeed the power supply of dual power supply one-to-two power circuit by single supply.
Power in respect of 20 μ W-2W totally 6 ranges switch by six throw switches of hilted broadsword on the panel to guarantee measuring accuracy; Build the gain that the sample resistance commutation circuit is selected preposition amplifier with analog switch, adopt logic gate and analog switch to form the position that the radix point positioning circuit is controlled radix point on the voltage table.
1, powering mode and feed circuit
The present invention adopts external direct current power supply and two kinds of powering modes of built-in 9V battery, and front panel powering mode change-over switch adopts external powering mode when pressing, switch to built-in 9V powered battery by time-out.
Adopt single supply commentaries on classics dual power supply and one-to-two power circuit the 9V power supply to be converted into ± the 4.5V dual power supply, to satisfy the most of components and parts needs requirements of one's work under the negative and positive dual power powering mode in the circuit.
2, measurement pattern
Incident laser after the neutral attenuator decay of OD3 (1 ‰) through lens focus to the photodiode of 10mm sensitization diameter, optical power signals is converted into photo-signal.The pre-amplification circuit that this photo-signal is built through the low bias voltage low noise amplifier of low bias current is converted into voltage signal.Before the enlargement factor on discharge road throw range shift switch by front panel hilted broadsword six and drive the sample resistance commutation circuit and sample resistance is switched between 100 Ω, 1K Ω, 10K Ω, 100K Ω, 1M Ω, 10M Ω and realize switching.Photodiode is the S2387-1010R and the G8370-82 of Japanese Hmamatsu company, and the low bias voltage low noise amplifier of low bias current is the TLC2652AIP of American TI Company.
The voltage signal that pre-amplification circuit produces adds DC offset correction through zeroing circuit, to remove bias light signal (like day light signal and the wigwag at night on daytime) and the dark current signals of photodiode and the leakage current signal of pre-amplification circuit in the measurement environment.The zeroing step must be carried out before laser incident, when promptly not having the photometry of treating incident (identical when keeping ambient lighting) with measurement, and rotation front panel zeroing knob, making the liquid crystal voltage meter reading on the guidance panel is zero.The detailed introduction of zeroing circuit is please referring to the embodiment part.
Voltage signal after proofreading and correct through zeroing circuit gets into the wavelength compensation circuit to carry out the wavelength calibration compensation and multiply by penalty coefficient to specific wavelength to remove difference response and the susceptibility of detector for the incident light of different frequency/wavelength.This penalty coefficient uses the wavelength compensation coefficient settings knob on the guidance panel to set in wavelength set mode, specifically please referring to following wavelength set mode.
On significant figure (not containing scaling position), equaled the real power of incident laser through the voltage signal after the wavelength compensation circuit.This signal is divided into two-way, and one tunnel low power consumption liquid crystal voltage table sent on the front panel shows, the one tunnel outputs to through analogue communication BNC output interface and to treat on the communication Instrument (like oscillograph, data collecting card).The position of radix point is thrown range shift switch by front panel hilted broadsword six and is driven the radix point positioning circuit and on voltage table, show on the voltage table.There have been the voltage significant figure of expression incident light real power to add that correct scaling position just can accurately read real optical power value on voltage table.Measure and accomplish.
3, wavelength set mode
The wavelength compensation coefficient settings is the same with the zeroing step must carry out before measuring.Press front panel wavelength set mode change-over switch, get into wavelength set mode.The input end of wavelength compensation circuit and the output terminal of zeroing circuit break off, and are communicated with the voltage reference of a 1.25V.The numeral that this moment, front panel liquid crystal voltage table showed becomes the magnitude of voltage of 1.25V voltage reference after certain proportion amplifies.This magnification ratio is by the wavelength compensation coefficient settings knob controlling on the guidance panel.This magnitude of voltage just can be used as the relative reference value of wavelength compensation coefficient (different wave length different magnifications).We provide a series of different reference values to different wavelengths, set the setting that correct reference value has just been accomplished penalty coefficient (enlargement factor) correct under this wavelength through wavelength compensation coefficient settings knob.
Specifically:
The present invention includes magnetic shielding metal machine box and laser pick-off probe;
The guidance panel of magnetic shielding metal machine box is provided with operation and display part, in magnetic shielding metal machine box, is provided with functional circuit;
Its annexation is:
Connect successively before and after laser pick-off probe, BNC input interface, pre-amplification circuit, zeroing circuit, wavelength set mode commutation circuit, the wavelength compensation circuit, the wavelength compensation circuit is connected with analogue communication BNC output interface with the liquid crystal voltage table respectively;
Hilted broadsword six is thrown range shift switch and is connected with the radix point positioning circuit with the sample resistance commutation circuit respectively, and the sample resistance commutation circuit is connected with pre-amplification circuit, and the radix point positioning circuit is connected with the liquid crystal voltage table;
The zeroing knob is connected with zeroing circuit;
The wavelength set mode change-over switch is connected with the wavelength set mode commutation circuit respectively with the 1.25V voltage reference circuit;
The external direct current power supply interface is connected with the powering mode change-over switch respectively with interior battery interface, and the powering mode change-over switch is changeed double power supply circuit with single supply respectively with the start button and is connected.
The present invention compares with existing laser powermeter, has the following advantages and good effect:
The applicable wavelengths scope is wide, measure that power bracket is big, measuring accuracy is high, response is fast, many powering modes, low-power consumption volume are little, in light weight, can communicate by letter, cost is low.
Description of drawings
Fig. 1 is a block diagram of the present invention;
Fig. 2 is a front panel synoptic diagram of the present invention;
Fig. 3 is a laser pick-off sonde configuration synoptic diagram;
Fig. 4 .1 is the wavelength sensitivity curve map of Si photodiode S2387-1010R;
Fig. 4 .2 is the wavelength sensitivity curve map of GaInAs photodiode G8370-82;
Fig. 5 changes the double power supply circuit schematic diagram for single supply;
Fig. 6 is a sample resistance commutation circuit schematic diagram;
Fig. 7 is the pre-amplification circuit schematic diagram;
Fig. 8 is the zeroing circuit schematic diagram;
Fig. 9 is wavelength set mode commutation circuit, 1.25V voltage reference circuit and wavelength compensation circuit theory diagrams;
Figure 10 is a radix point positioning circuit schematic diagram.
Wherein:
0-magnetic shielding metal machine box;
1-laser pick-off probe;
1.1-metal shell, the neutral attenuator of 1.2-OD3, the 1.3-condenser lens,
1.4-photodiode, 1.5-electromagnetic screen duplex wire, 1.6-BNC joint;
2-laser pick-off probe B NC input interface;
3-hilted broadsword six is thrown range shift switch;
4-sample resistance commutation circuit;
The 5-pre-amplification circuit;
The 6-knob that returns to zero;
The 7-zeroing circuit;
8-wavelength set mode change-over switch;
9-1.25V voltage reference circuit;
10-wavelength set mode commutation circuit;
11-wavelength compensation coefficient settings knob;
12-wavelength compensation circuit;
13-radix point positioning circuit;
14-liquid crystal voltage table;
15-analogue communication BNC output interface;
16-external direct current power supply interface;
The built-in 9V battery interface of 17-;
18-powering mode change-over switch;
The 19-single supply changes double power supply circuit;
The 20-button of starting shooting.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described in detail:
One, overall
Like Fig. 1,3, the present invention includes magnetic shielding metal machine box 0 and laser pick-off probe 1;
The operation and the display part that on the guidance panel of magnetic shielding metal machine box 0, are provided with have: liquid crystal voltage table 14, external direct current power supply interface 16, powering mode change-over switch 18, start button 20, wavelength set mode change-over switch 8, hilted broadsword six are thrown range shift switch 3, wavelength compensation coefficient settings knob 11, zeroing knob 6, laser pick-off probe B NC input interface 2 and analogue communication BNC output interface 15;
The circuit that in magnetic shielding metal machine box 0, is provided with has: single supply changes double power supply circuit 19, sample resistance commutation circuit 4, pre-amplification circuit 5, zeroing circuit 7,1.25V voltage reference circuit 9, wavelength set mode commutation circuit 10, wavelength compensation circuit 12 and radix point positioning circuit 13;
Its annexation is:
Laser pick-off probe 1, BNC input interface 2, pre-amplification circuit 5, zeroing circuit 7, wavelength set mode commutation circuit 10, wavelength compensation circuit 12 front and back connect successively; Wavelength compensation circuit 12 is connected with analogue communication BNC output interface 15 with liquid crystal voltage table 14 respectively, realizes the reception and the opto-electronic conversion of laser;
Hilted broadsword six is thrown range shift switch 3 and is connected with radix point positioning circuit 13 with sample resistance commutation circuit 4 respectively; Sample resistance commutation circuit 4 is connected with pre-amplification circuit 5; Radix point positioning circuit 13 is connected with liquid crystal voltage table 14, realizes that sample resistance and radix point display position switch according to different ranges;
Zeroing knob 6 is connected with zeroing circuit 7, thus the bias light signal in the increase direct current biasing offset measurement environment and the biasing of electronic component self in signal;
Wavelength set mode change-over switch 8 is connected with wavelength set mode commutation circuit 10 respectively with 1.25V voltage reference circuit 9, realizes the switching between measurement pattern and the wavelength compensation coefficient settings pattern;
External direct current power supply interface 16 is connected with powering mode change-over switch 18 respectively with interior battery interface 17; Powering mode change-over switch 18 is changeed double power supply circuit 19 with single supply respectively with start button 20 and is connected; Realize the switching of powering mode between external power supply power supply and internal battery power supply, and general+9V single supply transfer to ± the 4.5V dual power supply is that whole instrument is supplied power.
Principle of work of the present invention is:
Laser pick-off probe 1 links to each other with the input end of pre-amplification circuit 5 through laser pick-off probe B NC input interface 2; The sample resistance commutation circuit 4 that hilted broadsword six is thrown range shift switch 3 drivings also links to each other with pre-amplification circuit 5, to realize its switching between different gains;
The output terminal of pre-amplification circuit 5 links to each other with the input end of zeroing circuit 7, and the size of zeroing biasing is set by zeroing knob 6; Wavelength set mode change-over switch 8 driving wavelength set mode commutation circuits 10 are switched at the output terminal of zeroing circuit 7 input end of wavelength compensation circuit 12 with between the output terminal of 1.25V voltage reference circuit 9, to realize the switching of power meter between wavelength set mode and power measurement mode;
The wavelength compensation coefficient is set by wavelength compensation coefficient settings knob 11; At last, the output terminal of wavelength compensation circuit 12 links to each other with the input end of analogue communication BNC output interface 15 with liquid crystal voltage table 14, realizes the output of measurement result;
The radix point positioning circuit 13 that hilted broadsword six is thrown range shift switch 3 drivings links to each other with the radix point control interface of liquid crystal voltage table 14, to realize the accurate location of radix point;
Total system is changeed double power supply circuit 19 power supplies by single supply, and powering mode change-over switch 18 is coupled, to realize that powering mode switches between external direct current power supply 16 and built-in 9V battery 17.
Two, functional part
* magnetic shielding metal machine box 0
Magnetic shielding metal machine box 0 is selected 18 * 16 * 8cm pig-casting machine box commonly used for use.
* the laser pick-off probe 1
Like Fig. 3, laser pick-off probe 1 comprises the 1st laser pick-off probe and the 2nd laser pick-off probe;
Its structure is: in metal shell 1.1, from front to back, be disposed with the neutral attenuator 1.2 of OD3, lens 1.3 and photodiode 1.4; Photodiode 1.4, characteristic impedance 50 Ω electromagnetic screen duplex wires 1.5 are connected with BNC connector 1.6 front and back successively.
Laser focuses on through neutral attenuator 1.2 decay and lens 1.3, converts electric signal into through photodiode 1.4 again, again through characteristic impedance 50 Ω electromagnetic screen duplex wires 1.5 and BNC connector 1.6 outputs.
Like Fig. 4 .1,4.2, the wavelength response range of Si photodiode is 0.3-1.1 μ m, and the responding range of GaInAs photodiode is 0.9-1.7 μ m, just can realize doubling of wavelength measurement scope through complementation;
So the probe of the laser pick-off among the present invention 1 comprises two laser pick-off probes,
1st, its photodiode 1.4 of 2 laser pick-ofves probe is respectively silicon photoelectric diode S2387-1010R and Gallium indium arsenide photodiode G8370-82.
When measuring the wavelength of 0.3-1 μ m, use the 1st laser pick-off probe; When measuring the wavelength of 1-1.7 μ m, use the 2nd laser pick-off probe; Thereby realize from the seamless continuous coverage between 0.3-1.7 μ m.
* the BNC input interface 2
* hilted broadsword six is thrown range shift switch 3
Hilted broadsword six is thrown range shift switch 3 and is selected universal standard part for use.
* the sample resistance commutation circuit 4
Like Fig. 6, sample resistance commutation circuit 4 selects 1 analog switch chip 74HC4053 to build by 23 the tunnel 2; Have 6 groups of sample resistances from 100 Ω to 10M Ω and be connected on 6 groups of input ends respectively, the connect together output terminal (6 pin) of the main amplifier of receiving pre-amplification circuit 5 of 6 groups of output terminals; 6 groups of corresponding control ends respectively with front panel on hilted broadsword six throw range shift switch 3 20 μ W-2W totally 6 output terminals is connected, throw range shift switch 3 by a hilted broadsword six on the guidance panel and realize switchings.Which gear is this change-over switch get to, and which control end high level just sends into, thereby corresponding sample resistance is linked in the middle of the pre-amplification circuit 4, and the gain that realizes pre-amplification circuit is with the switching of measuring range.
* pre-amplification circuit 5
Like Fig. 1, at first pass through by sample resistance commutation circuit 4 driving pre-amplification circuits 5 by the photo-signal that laser pick-off probe 1 produces.
Like Fig. 7, its main amplifier is that TI (Texas Instrument) manufactured model is TLC2652AIP, and input bias current has only 2pA, and bias voltage has only 0.5 μ V, can guarantee when measuring the atomic low light level signal amplification quality to atomic low light level current signal effectively; Its gain is confirmed by the switching of sample resistance commutation circuit 4 between 6 grades of sample resistances.
* knob 6 returns to zero
Zeroing knob 6 is selected Bourns 359010K multiturn potentiometer for use.
* zeroing circuit 7
Like Fig. 1, amplify voltage signal afterwards at first through zeroing circuit 7 by pre-amplification circuit 5;
Like Fig. 8, zeroing circuit 7 is adding circuits, and the amplitude of biasing is by 6 controls of zeroing knob; Its function is the adjustable direct current biasing of voltage signal increase for input, to remove bias light signal (like day light signal and the wigwag at night on daytime) and the dark current signals of photodiode and the leakage current signal of pre-amplification circuit 5 in the measurement environment.
* the wavelength set mode change-over switch 8
Wavelength set mode change-over switch 8 is selected the straight key self-lock switch of general DPDT for use.
* the 1.25V voltage reference circuit 9
Like Fig. 9,1.25V voltage reference circuit 9 uses the 1.25V voltage reference LM385-1.2 of National Semiconductor to build;
* the wavelength set mode commutation circuit 10
Like Fig. 9, wavelength set mode commutation circuit 10 selects 1 analog switch chip 74HC4053 to build by one 3 the tunnel 2;
The control end of two paths of signals connects together among the 74HC4053, and switches between 4.5V high level and 0V low level through wavelength set mode change-over switch 8; 4.5V power supply is connected on the input end that the first via 2 is selected 1 switch, this road output terminal links to each other with the power end of 1.25V voltage reference circuit 9; The output terminal of the output terminal of zeroing circuit 7 and 1.25V voltage reference circuit 9 be connected on respectively the second the tunnel 2 select 1 switch two input ends, this road output terminal links to each other with the input end of wavelength compensation circuit 12.
The function that wavelength set mode commutation circuit 10 realizes is: when wavelength set mode change-over switch 8 was pressed, the power end of 1.25V voltage reference circuit 9 was communicated with the 4.5V power supply and starts working; The output terminal of while 1.25V voltage reference circuit 9 is communicated with the input end of wavelength compensation circuit 12 goes forward side by side into wavelength set mode.When wavelength set mode change-over switch 8 was broken off, the power end of 1.25V voltage reference circuit 9 and 4.5V dump also quit work; Simultaneously the output terminal of zeroing circuit 7 is communicated with the input end of wavelength compensation circuit 12 and gets into measurement pattern.
* wavelength compensation coefficient settings knob 11
Wavelength compensation coefficient settings knob 11 is selected Bourns 3590100K multiturn potentiometer for use.
* the wavelength compensation circuit 12
Like Fig. 9, wavelength compensation circuit 12 is the reverse amplification circuits that enlargement factor is variable, and enlargement factor is by 11 controls of wavelength compensation knob.Its output terminal links to each other with the input end of liquid crystal voltage table 14 and analogue communication BNC output interface 15.
* the radix point positioning circuit 13
Like Figure 10, radix point positioning circuit 13 selects 1 analog switch chip 74HC4053 to form by one 4 road or door chip 74HC32 and one 3 tunnel 2;
Hilted broadsword six on the front panel is thrown 20 μ W of range shift switch 3 and three groups or six input ends of door that 20mW, 200 μ W and 200mW, 2mW and 2W output terminal are connected on 74HC32 respectively; Three output terminals of three groups or door are connected on three control ends of 74HC4053 respectively, and three groups of output terminals of 74HC4053 are connected with three radix point control ends of liquid crystal voltage table 14 respectively.Thereby realize the positioning function of radix point in the liquid crystal voltage table 14.
Illustrate: when hilted broadsword six is thrown range shift switch 3 and got to 20 μ W or 20mW shelves; Or the 1 tunnel output high level (3 pin) of door chip is to the Y road control end (B pin) of analog switch chip; Thereby make Y road output high level light last second radix point of LCD, show example 19.99.When should hilted broadsword six throwing range shift switch 3 and get to 200 μ W or 200mW shelves, the 3rd radix point lighted on the liquid crystal voltage table 14, shows example 199.9.When hilted broadsword six was thrown range shift switch 3 and got to 2mW or 2W shelves, first radix point was lighted on the liquid crystal voltage table 14, showed example 1.999.
* liquid crystal voltage table 14
Liquid crystal voltage table 14 adopts homemade universal 2V voltage table, and model is UP5035.
Full scale shows 1999,3 input pins is arranged to confirm the display position of radix point, and like 1 pin high level, radix point is presented at 1.999; 2 pin high level are presented at 19.99; The high-low level of these three pin distributes by 13 controls of radix point positioning circuit.
15, analogue communication BNC output interface 15
Analogue communication BNC output interface 15 is selected Q9 working standard spare for use.
16, the external direct current power supply interface 16
External direct current power supply interface 16 is selected 2.5mm working standard spare for use.
17, built-in 9V battery interface 17
Built-in 9V battery interface 17 is selected working standard spare for use.
18, the powering mode change-over switch 18
Powering mode change-over switch 18 is selected DPDT self-locking uni-directional push-button switch for use.
19, single supply changes double power supply circuit 19
Like Fig. 5, it is a kind of power circuits commonly used that single supply changes double power supply circuit 19;
At first make the intermediate value zero potential, import the voltage follow module that general amplifier OP07 builds, form power amplifier module via two triode 2N3904,2N3906 again and make earth potential by resistance resistance R 01, R02 such as two.Thereby realized by the conversion of+9V power supply to ± 4.5V power supply.
20, start button 20
Three, the resulting parameter of actual measurement is following:
Applicable wavelengths scope: 0.3-1.7 μ m
Measure power bracket: 10nW-1.99W
Highest measurement precision: 0.5 ‰ (six ranges all satisfy)
Response speed:＜30 μ s
Powering mode: built-in 9V battery or external 9V direct supply
Power consumption:＜0.5W
Battery serviceable life:＞50 hours (1 joint 9V battery)
Volume (not containing probe): 18cm * 16cm * 8cm
Weight (not containing probe): 500g
This shows that the present invention has realized the described laser powermeter with series of advantages such as wavelength coverage is wide, power bracket is big, measuring accuracy is high, response is fast, many powering modes, the low-power consumption volume are little, in light weight, cost is low of a kind of preamble.
Claims (5)
1. wide-waveband multi-range high-precision low-power consumption portable laser power meter is characterized in that:
The present invention includes magnetic shielding metal machine box and laser pick-off probe;
The guidance panel of magnetic shielding metal machine box is provided with operation and display part, in magnetic shielding metal machine box, is provided with functional circuit;
Its annexation is:
Connect successively before and after laser pick-off probe (1), BNC input interface (2), pre-amplification circuit (5), zeroing circuit (7), wavelength set mode commutation circuit (10), the wavelength compensation circuit (12); Wavelength compensation circuit (12) is connected with analogue communication BNC output interface (15) with liquid crystal voltage table (14) respectively, realizes the reception and the opto-electronic conversion of laser;
Hilted broadsword six is thrown range shift switch (3) and is connected with radix point positioning circuit (13) with sample resistance commutation circuit (4) respectively; Sample resistance commutation circuit (4) is connected with pre-amplification circuit (5); Radix point positioning circuit (13) is connected with liquid crystal voltage table (14), realizes that sample resistance and radix point display position switch according to different ranges;
Zeroing knob (6) is connected with zeroing circuit (7), thus the bias light signal in the increase direct current biasing offset measurement environment and the biasing of electronic component self in signal;
Wavelength set mode change-over switch (8) is connected with wavelength set mode commutation circuit (10) respectively with 1.25V voltage reference circuit (9), realizes the switching between measurement pattern and the wavelength compensation coefficient settings pattern;
External direct current power supply interface (16) is connected with powering mode change-over switch (18) respectively with interior battery interface (17); Powering mode change-over switch (18) is changeed double power supply circuit (19) with single supply respectively with start button (20) and is connected; Realize the switching of powering mode between external power supply power supply and internal battery power supply, and general+9V single supply transfer to ± the 4.5V dual power supply is that whole instrument is supplied power;
Described laser pick-off probe (1) comprises the 1st laser pick-off probe and the 2nd laser pick-off probe; 1st, 2 laser pick-ofves its photodiodes of probe (1.4) are respectively silicon photoelectric diode and Gallium indium arsenide photodiode; When measuring the wavelength of 0.3-1 μ m, use the 1st laser pick-off probe; When measuring the wavelength of 1-1.7 μ m, use the 2nd laser pick-off probe.
2. by the described laser powermeter of claim 1, it is characterized in that the structure of laser pick-off probe (1) is:
In metal shell (1.1), from front to back, be disposed with the neutral attenuator (1.2) of OD3, lens (1.3) and photodiode (1.4); Be connected successively before and after photodiode (1.4), characteristic impedance 50 Ω electromagnetic screen duplex wires (1.5) and the BNC connector (1.6).
3. by the described laser powermeter of claim 1, it is characterized in that:
Sample resistance commutation circuit (4) selects 1 analog switch chip 74HC4053 to build by 23 the tunnel 2;
Have 6 groups of sample resistances from 100 Ω to 10M Ω and be connected on 6 groups of input ends respectively, connect together output terminal 6 pin of the main amplifier of receiving pre-amplification circuit 5 of 6 groups of output terminals; 6 groups of corresponding control ends respectively with front panel on hilted broadsword six throw range shift switch (3) 20 μ W-2W totally 6 output terminals is connected, realize the switching of the gain of pre-amplification circuit with the measurement range.
4. by the described laser powermeter of claim 1, it is characterized in that:
Wavelength set mode commutation circuit (10) selects 1 analog switch chip 74HC4053 to build by one 3 the tunnel 2;
The control end of two paths of signals connects together among the 74HC4053, and switches between 4.5V high level and 0V low level through wavelength set mode change-over switch (8); 4.5V power supply is connected on the input end that the first via 2 is selected 1 switch, this road output terminal links to each other with the power end of 1.25V voltage reference circuit (9); The output terminal of the output terminal of zeroing circuit (7) and 1.25V voltage reference circuit (9) be connected on respectively the second the tunnel 2 select 1 switch two input ends, this road output terminal links to each other with the input end of wavelength compensation circuit (12).
5. by the described laser powermeter of claim 1, it is characterized in that:
Radix point positioning circuit (13) selects 1 analog switch chip 74HC4053 to form by one 4 road or door chip 74HC32 and one 3 tunnel 2;
Hilted broadsword six on the front panel is thrown 20 μ W of range shift switch (3) and three groups or six input ends of door that 20mW, 200 μ W and 200mW, 2mW and 2W output terminal are connected on 74HC32 respectively; Three output terminals of three groups or door are connected on three control ends of 74HC4053 respectively; Three groups of output terminals of 74HC4053 are connected with three radix point control ends of liquid crystal voltage table (14) respectively, realize the positioning function of radix point in the liquid crystal voltage table (14).
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| CN104266751B (en) * | 2014-10-15 | 2016-04-06 | 江玉柱 | Multi-wavelength laser power calibrating instrument and calibration method thereof |
| CN115464246B (en) * | 2022-09-26 | 2023-12-22 | 河北众航高能科技有限公司 | Electron beam focusing magnetic lens driving circuit and electron beam welding equipment thereof |
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