CN104615054A - System and method for power invariability of laser - Google Patents
System and method for power invariability of laser Download PDFInfo
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- CN104615054A CN104615054A CN201510032861.2A CN201510032861A CN104615054A CN 104615054 A CN104615054 A CN 104615054A CN 201510032861 A CN201510032861 A CN 201510032861A CN 104615054 A CN104615054 A CN 104615054A
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- G—PHYSICS
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
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- H—ELECTRICITY
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- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
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Abstract
The invention discloses a system and a method for power invariability of a laser; the system comprises a laser, an optical splitter, a photoelectric converter, a signal converter, a data processor, a temperature detector and a power regulator; the method comprises the steps: the optical splitter divides light signals, emitted by the laser, into two parts at the percentage of A:B; the photoelectric converter converts the light signals, sent by the optical splitter, into electrical signals; the signal converter converts the electrical signals into data and sends the data to the data processor; the data processor calculates the actual power emitted by the laser; the temperature detector accurately detects the real-time temperatures of the photoelectric converter and the outside environment and compares with the temperatures; the power regulator regulates the preset power value in the laser according to the actual power calculated by the data processor and then determines the light emission power of the laser. The system and the method solves the technical problems incapable of realized in the prior art and have the advantages of rational setting, simple operation in the control method, stable light emission power of the laser, low cost and low power in consumption of the laser.
Description
Technical field
The present invention relates to communication test field, specifically, relate to a kind of power invariability system and method for laser instrument.
Background technology
Laser instrument utilizes stimulated radiation principle that light is amplified in some material be stimulated or the device launched that vibrates.During laser works, lasing essential condition is population inversion and the loss of gain serious offense, so requisite ingredient has driving source, has actuating medium two parts of metastable level in device.Excitation is energized into excited state after actuating medium absorbs extraneous energy, creates conditions for realizing and maintaining population inversion.Energisation mode has optical excitation, electric excitation, chemical pumping and nuclear energy excitation etc.
But the luminescence due to different semiconductor laser has very large discreteness, even if same laser instrument luminous power under different temperature, humidity also has difference.In order to address this problem, the general method adopted is, is designed with and adds temperature adjustment, have and add back of the body spy, have and add isolator etc., but due to the problem of device itself, output power can alter a great deal, and cannot meet high precision development & production needs at circuit of light sources.
In addition, the constant method of laser power of the prior art has larger limitation: when increasing temperature and regulating, general is all the temperature variation curve being carried out analog laser by transistor circuit, can only be probably close, can not coincide with the PN junction temperature curve of laser instrument; When the increase back of the body is visited, owing to being the scattered light receiving laser instrument, direction, distance difference, the power difference received is very large, even if receiver is more stable, different laser instruments also has different electric currents and exports, and also has very large difference according to the laser power that such electric current regulates; In addition, if keep the temperature constant of laser instrument, the power stability doing laser instrument is like this reasonable, but the maintenance of temperature can consume very large power, and due to the temperature contrast of other positions on laser component and plank, the temperature of board can be caused unbalanced, affect the overall performance of board.
Patent document 201310600774.3 provides a kind of laser optical power self-adaptation control method based on MCU, MCU control unit is set up with host computer and is communicated, the mode being arranged adaptive control by host computer is that laser bias current regulates or laser optical power regulates, when adopting laser optical power to regulate, MCU control unit is according to the target luminous power value of host computer setting and carry out adaptive control to the actual luminous power value of laser instrument sampling; When adopting laser bias current to regulate, MCU control unit is according to the target bias current value of host computer setting and carry out adaptive control to the actual bias current value of laser instrument sampling.It arranges complexity, can not reach effective control to the power of laser instrument, and its method in control procedure is loaded down with trivial details, troublesome poeration.
Therefore, how to research and develop a kind of power invariability system and method for laser instrument, solve the problem, just become technical matters urgently to be resolved hurrily.
Summary of the invention
The subject matter that the application solves is to provide a kind of power invariability system and method for laser instrument, what cannot realize with solution arranges rationally, control method luminous power simple to operate, that make laser instrument is stable, cost is low, and the technical matters that the power of laser instrument consumption is little.
In order to solve the problems of the technologies described above, the invention provides a kind of power invariability system of laser instrument, comprising: laser instrument, optical splitter, photoelectric commutator, signal converter, data processor, temperature detector and power governor, wherein,
Described optical splitter, for the light signal launched in described laser instrument is divided into two parts with the ratio of A:B, and is sent to photoelectric commutator by the light signal of B ratio;
Described photoelectric commutator, converts electric signal to for the light signal sent by described optical splitter, and this electric signal is sent to signal converter;
Described signal converter, is sent to data processor for this electric signal is converted to data;
Described data processor, for receiving the data that described signal converter sends, and calculates the real power that laser instrument sends, and is sent in described power governor by this real power;
Described temperature detector, for accurately detecting the real time temperature of photoelectric commutator and external environment condition, and contrasts with ambient temperature;
Described power governor, according to the real power that data processor calculates, regulates the performance number preset in laser instrument, to determine the luminous power of laser instrument.
Further, wherein, described A:B is 99:1, and the light signal of 1% is sent to described photoelectric commutator.
Further, wherein, described signal converter, comprises further: amplifying circuit, filtering circuit, voltage calibration circuit and analog to digital converter, wherein,
Described amplifying circuit, for amplifying signal, electric current and voltage;
Described filtering circuit, for being connected with described amplifying circuit, filters out effective electric signal, and this effective electric signal is sent to analog to digital converter;
Described voltage calibration circuit, for calibrating the offset voltage variation with temperature in described signal converter;
Described analog to digital converter, for converting described effective electric signal to data, is sent to described data processor.
Further, wherein, described data processor, is: arm processor further.
Further, wherein, described power governor, comprises further: digital to analog converter, current calibration circuit, current control circuit and driving circuit, wherein,
Described digital to analog converter, for described real power value is converted to electric signal, and is sent to current control circuit by this electric signal;
Described current calibration circuit, for providing correcting current curve for described current control circuit;
Described current control circuit, is converted to current value for the electric signal transmitted by digital to analog converter, the theoretical value on this current value and correcting current curve is contrasted, and current value is sent to described driving circuit;
Described driving circuit, for the current value of received current control circuit, and regulates according to the predetermined power value of this current value to laser instrument, determines the luminous power of laser instrument.
Further, wherein, described temperature sensor, is, temperature sensor further.
Further, wherein, described amplifying circuit, comprises trans-impedance amplifier, voltage amplifier and signal amplifier further.
Described filtering circuit, comprises RC wave filter, low-pass filter and bandpass filter further.
The invention also discloses a kind of power invariability method of laser instrument, comprise the following steps:
Step 1: the light signal launched in described laser instrument is divided into two parts with the ratio of A:B by optical splitter, and the light signal of B ratio is sent to photoelectric commutator;
Step 2: photoelectric commutator converts the light signal that described optical splitter sends to electric signal, and this electric signal is sent to signal converter;
Step 3: this electric signal is converted to data and is sent to data processor by signal converter;
Step 4: data processor receives the data that described signal converter sends, and calculate the real power that laser instrument sends, and real power value is sent in described power governor;
Step 5: temperature detector accurately detects the real time temperature of photoelectric commutator and external environment condition, and contrasts with ambient temperature;
Step 6: the real power that power governor calculates according to data processor, regulates the performance number preset in laser instrument, to determine the luminous power of laser instrument.
Further, wherein, described step 3 also comprises:
Step 3.1: signal, electric current and voltage amplify by amplifying circuit;
Step 3.2: filtering circuit and described amplifying circuit connect, and filter out effective electric signal, and this effective electric signal is sent to analog to digital converter;
Step 3.3: voltage calibration circuit is calibrated the offset voltage variation with temperature in described signal converter;
Step 3.4: analog to digital converter converts described effective electric signal to data, is sent to described data processor.
Further, wherein, described step 6 also comprises:
Real power value is converted to electric signal by step 6.1 digital to analog converter, and this electric signal is sent to current control circuit;
Step 6.2: correcting current curve is sent to described current control circuit by current calibration circuit;
Step 6.3: the electric signal that described digital to analog converter transmits is converted to current value by described current control circuit, and the theoretical value on this current value and correcting current curve is contrasted, current value is sent to driving circuit;
The current value of step 6.4 driving circuit received current control circuit, and regulate according to the predetermined power value of this current value to laser instrument, to determine the luminous power of laser instrument.
Compared with prior art, the power invariability system and method for a kind of laser instrument described in the application, reaches following effect:
(1) the power invariability system of laser instrument of the present invention, comprise: laser instrument, optical splitter, photoelectric commutator, signal converter, data processor and power governor, arrange simple, thus the power that laser instrument sends is regulated, make that the luminous power of laser instrument is stable, cost is low, and the power that laser instrument consumes is little;
(2) the power invariability system of laser instrument of the present invention, also comprise: temperature detector, this temperature detector can the real time temperature of accurate response photoelectric commutator and external environment, compares, avoid the situation of luminous power instability with ambient temperature;
(3) the power invariability method of laser instrument of the present invention, its step is simple, the luminous power of laser instrument can be made to be controlled effectively, to adopt the method for High Speed Analog amplification and real-time sampling, the power that laser instrument sends can be obtained in time, accurately.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms a part of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the structural drawing of the power invariability system of a kind of laser instrument of the present invention;
Fig. 2 is the structural drawing of the signal converter of the power invariability system of a kind of laser instrument of the present invention;
Fig. 3 is the structural drawing of the power governor of the power invariability system of a kind of laser instrument of the present invention;
Fig. 4 is the system flowchart of the power invariability method of a kind of laser instrument of the present invention;
Fig. 5 is that in prior art, predetermined power value is the current value of 3mw and the relationship change figure of temperature in the laser;
Fig. 6 is after application method of the present invention, the relationship change figure of current value and temperature during different predetermined power value.
Embodiment
As employed some vocabulary to censure specific components in the middle of instructions and claim.Those skilled in the art should understand, and hardware manufacturer may call same assembly with different noun.This specification and claims are not used as with the difference of title the mode distinguishing assembly, but are used as the criterion of differentiation with assembly difference functionally." comprising " as mentioned in the middle of instructions and claim is in the whole text an open language, therefore should be construed to " comprise but be not limited to "." roughly " refer to that in receivable error range, those skilled in the art can solve the technical problem within the scope of certain error, reach described technique effect substantially.In addition, " couple " word and comprise directly any and indirectly electric property coupling means at this.Therefore, if describe a first device in literary composition to be coupled to one second device, then represent described first device and directly can be electrically coupled to described second device, or be indirectly electrically coupled to described second device by other devices or the means that couple.Instructions subsequent descriptions is implement the better embodiment of the application, and right described description is for the purpose of the rule that the application is described, and is not used to the scope limiting the application.The protection domain of the application is when being as the criterion depending on the claims person of defining.
Below in conjunction with accompanying drawing, the application is described in further detail, but not as the restriction to the application.Embodiment 1
As shown in Figure 1, the invention provides a kind of power invariability system of laser instrument, comprising: laser instrument 1, optical splitter 2, photoelectric commutator 3, signal converter 4, data processor 5, temperature detector 7 and power governor 6, wherein,
Described optical splitter 2, for being divided into two parts by the light signal launched in described laser instrument 1 with the ratio of A:B.
Particularly, this light signal of 1% for the light signal launched in described laser instrument 1 is divided into two parts with the ratio of 99:1, and is sent to described photoelectric commutator 3 by the optical splitter 2 of the present embodiment 1; But in concrete enforcement, the light signal launched in laser instrument 1 can be not limited to be divided into two parts with the ratio of 99:1 by described optical splitter 2, can be divided into two parts with arbitrary ratio, such as: 9999:1,999:1,98:2,97:3,96:4, etc., determine according to actual conditions.
Described photoelectric commutator 3, converts electric signal to for the light signal sent by described optical splitter 2, and this electric signal is sent to signal converter 4.
Particularly, described photoelectric commutator 3, for described optical splitter 2 is sent 1% light signal convert electric signal to, and this electric signal is sent to signal converter 4; The light signal taken a morsel, be sent to signal converter, this part selected light signal, according to the change of the electric current of this part light signal, voltage and power, regulate the pre-set current value in laser instrument 1, and then for the power of the part light of light detection in adjustment laser instrument 1.
Preferably, the message transmission rate of described photoelectric commutator 3 reaches 1Gbps, and signal rate reaches 1Ghz, undistorted, and transformation efficiency is high.
Preferably, described photoelectric commutator 3, is further: PIN diode photoelectric commutator, this PIN diode photoelectric commutator, can comprise PIN photodiode and trans-impedance amplifier (TIA amplifier), i.e. PIN-TIA photoelectric commutator, for being converted to electric signal by light signal; PIN-TIA photoelectric commutator is for converting faint light signal to electric signal in optical communication system and signal being carried out the sensitive detection parts of some strength low noise amplification, its principle of work is: when the photosurface of PIN photodiode is penetrated by detection illumination, because p-n junction is in reverse bias, photo-generated carrier produces drift under the effect of electric field, produces photocurrent at external circuit; Photocurrent amplifies output by trans-impedance amplifier, so just achieves the function that light signal converts electric signal to and then tentatively amplified by electric signal.
Described signal converter 4, is sent to data processor 5 for this electric signal is converted to data.
Particularly, described signal converter 4, comprises further: amplifying circuit 401, filtering circuit 402, voltage calibration circuit 404 and analog to digital converter 403, wherein,
Described amplifying circuit 401, for amplifying signal, electric current and voltage;
Described filtering circuit 402, for being connected with described amplifying circuit 401, filters out effective electric signal, and this effective electric signal is sent to analog to digital converter 403;
Described voltage calibration circuit 404, for calibrating the offset voltage variation with temperature in described signal converter 4;
Described analog to digital converter 403, for converting described effective electric signal to data, is sent to described data processor 3.
Preferably, described analog to digital converter 403 is the converters converting the discrete signal represented with binary numeral to through comparing the analog quantity after process with standard volume (or reference quantity), abbreviation ADC or A/D converter.Usual with export digital signal figure place number represent.The figure place of the digital signal that analog to digital converter 403 can accurately export is more, and the ability that expression converter can differentiate input signal is stronger, and the performance of converter is also better.A/D conversion generally will through over-sampling, maintenance, quantification and coding 4 processes.In side circuit, some process merges carries out, and as sampling and maintenance, quantizes and be coded in transfer process to realize simultaneously.
Preferably, described amplifying circuit 401 is the electronic circuit increasing electrical signal amplitude or power.The device that application amplifying circuit 401 realizes amplifying is called amplifier.Its core is electronic active device, as electron tube, transistor etc.The essence of amplification is to output signal the energy trasfer of power supply.The amplifying circuit of the present embodiment, comprises trans-impedance amplifier, voltage amplifier and signal amplifier further.
Described filtering circuit 402, is usually used in the ripple in elimination rectifier output voltage, is generally made up of reactance component, as at pull-up resistor two ends shnt capacitor C, or with load in series inductor L, and by electric capacity, the various compound filtering circuit of inductance composition.Filtering circuit 402 described in the present embodiment, comprises RC wave filter, low-pass filter and bandpass filter further; Described low-pass filter is Butterworth low-pass filter further, and described bandpass filter is Butterworth bandpass filter further.
Signal converter 4 set by the present embodiment 1, when specific works, the electric signal in described signal converter 4 is first through RC wave filter, after carrying out a filtering, be connected with described trans-impedance amplifier, electric signal after the amplification of trans-impedance amplifier, then through low-pass filter secondary filtering; Voltage amplification is carried out through voltage amplifier, then through three filtering of Butterworth bandpass filter, and by voltage calibration circuit 404, the offset voltage variation with temperature in described signal converter 4 is calibrated; Finally carry out signal amplification through signal amplifier again, then through Butterworth LPF four filtering, and by voltage calibration circuit 404, the offset voltage variation with temperature in described signal converter 4 is calibrated; The useful signal filtered out is sent to analog to digital converter 403.
Described data processor 5, for receiving the data that described signal converter 4 sends, and calculates the real power that laser instrument 1 sends, and real power value is sent in described power governor 6;
Preferably, described data processor 5, is: arm processor further, and what select in the present embodiment is arm processor, this arm processor, is a kind of 32 embedded RISC processors.ARM (Advanced RISC Machines) arm processor has multiple register, several groups can be divided into, these registers comprise: general-purpose register and status register, wherein, described general-purpose register, comprise programmable counter (PC pointer), be the register of 32; Described status register, in order to the running status of the duty and program that identify CPU, is also the register of 32; Certainly, the data processor 5 described in the present embodiment 1, is not limited to arm processor, can also be other processor, selects highly preferred data processor 5 according to actual needs.
Described temperature detector 7, for accurately detecting the real time temperature of photoelectric commutator and external environment, and contrasts with ambient temperature.
Preferably, the temperature detector 7 described in the present embodiment 1, is, temperature sensor further; Described temperature sensor (temperature transducer) refers to can experience temperature and the sensor converting usable output signal to.Contact and contactless two large classes can be divided into by metering system, be divided into thermal resistance and thermopair two class according to sensor material and electron component characteristic.Temperature sensor has four kinds of main Types: thermopair, thermistor, resistance temperature detector (RTD) and IC temperature sensor.Select highly preferred temperature sensor according to specific needs.
Described power governor 6, according to the real power that data processor 5 calculates, regulates the performance number preset in laser instrument 1, to determine the luminous power of laser instrument 1.
Preferably, described power governor 6, comprises further: digital to analog converter 601, current calibration circuit 604, current control circuit 602 and driving circuit 603, wherein,
Described digital to analog converter 601, for described real power value is converted to electric signal, and is sent to current control circuit 602 by this electric signal;
Described current calibration circuit 604, for providing correcting current curve for described current control circuit 602;
Described current control circuit 602, is converted to current value for the electric signal transmitted by digital to analog converter 601, and the theoretical value on this current value and correcting current curve is contrasted, and current value is sent to described driving circuit 603;
Described driving circuit 603, for the current value of received current control circuit 602, and regulates according to the predetermined power value of this current value to laser instrument 1, determines the luminous power of laser instrument 1.
Described digital to analog converter 601, is that a kind of discrete signal by binary digit amount form converts to the converter of standard volume (or reference quantity) analog quantity that is benchmark, also known as D/A converter, is called for short DAC.The digital quantity of parallel binary is mainly converted to DC voltage or DC current by described digital to analog converter 601, and it is commonly used for the output channel of process control computer system, is connected with actuator, realizes the automatic control to production run.
Power governor 6 described in the present embodiment 1, when specific works, described digital to analog converter 601 receives the real power value that data processor 3 transmits, and this real power value is converted to electric signal, is sent to current control circuit 602; Correcting current curve is sent to described current control circuit 602 by current calibration circuit 604; The electric signal that digital to analog converter 601 transmits is converted to current value by this current control circuit 602, and the theoretical value on this current value and correcting current curve is contrasted, then, current value is sent to described driving circuit 603, the current value of described driving circuit 603 received current control circuit 602, regulate according to the predetermined power value of this current value to laser instrument 1, determine the luminous power of laser instrument 1.
Embodiment 2
As shown in Figure 4, the invention discloses a kind of power invariability method of laser instrument, comprise the following steps:
Step 1: the light signal launched in described laser instrument is divided into two parts with the ratio of A:B by optical splitter, and the light signal of B ratio is sent to photoelectric commutator;
Step 2: photoelectric commutator converts the light signal that described optical splitter sends to electric signal, and this electric signal is sent to signal converter;
Step 3: this electric signal is converted to data and is sent to data processor by signal converter;
Step 4: data processor receives the data that described signal converter sends, and calculate the real power that laser instrument sends, and this real power is sent in described power governor;
Step 5: temperature detector detects the real time temperature of photoelectric commutator and external environment condition, and contrasts with ambient temperature;
Step 6: the real power that power governor calculates according to data processor, regulates the performance number preset in laser instrument, to determine the luminous power of laser instrument.
In addition, the invention also discloses the power invariability method of another kind of laser instrument, comprise the following steps:
Step 1: the light signal launched in laser instrument is divided into two parts with the ratio of 99:1 by optical splitter, and this light signal of 1% is sent to described photoelectric commutator;
Step 2: photoelectric commutator described optical splitter is sent 1% light signal convert electric signal to, and this electric signal is sent to signal converter;
Step 3: this electric signal is converted to data and is sent to data processor by signal converter;
Step 4: data processor receives the data that described signal converter sends, and calculate the real power that laser instrument sends, and this real power is sent in described power governor;
Step 5: temperature detector detects the real time temperature of photoelectric commutator and external environment condition, and contrasts with ambient temperature;
Step 6: the real power that power governor calculates according to data processor, regulates the performance number preset in laser instrument, to determine the luminous power of laser instrument.
Preferably, described step 3 also comprises:
Step 3.1: signal, electric current and voltage amplify by amplifying circuit;
Step 3.2: filtering circuit and described amplifying circuit connect, and filter out effective electric signal, and this effective electric signal is sent to analog to digital converter;
Step 3.3: voltage calibration circuit is calibrated the offset voltage variation with temperature in described signal converter;
Step 3.4: analog to digital converter converts described effective electric signal to data, is sent to described data processor.
Preferably, described step 6 also comprises:
Described data are converted to electric signal by step 6.1 digital to analog converter, and this electric signal is sent to current control circuit;
Step 6.2: correcting current curve is sent to described current control circuit by current calibration circuit;
Step 6.3: the electric signal that digital to analog converter transmits by current control circuit is converted to current value, and the theoretical value on this current value and correcting current curve is contrasted, and current value is sent to described driving circuit;
The current value of step 6.4 driving circuit received current control circuit, and regulate according to the predetermined power value of this current value to laser instrument, determine the luminous power of laser instrument.
Preferably, this light signal of 1% for the light signal launched in described laser instrument 1 is divided into two parts with the ratio of 99:1, and is sent to described photoelectric commutator 3 by the optical splitter 2 of the present embodiment 1; But in concrete enforcement, the light signal launched in laser instrument 1 can be not limited to be divided into two parts with the ratio of 99:1 by described optical splitter 2, can be divided into two parts with arbitrary ratio, such as: 9999:1,999:1,98:2,97:3,96:4, etc., determine according to actual conditions.
Preferably, before this method specific works, the light signal of a lower powered short time transmitting can be set in the laser, the method of the present embodiment 2 is adopted to finely tune laser instrument, to prevent because variation of ambient temperature is comparatively large, there is the situation of luminous power instability when official testing.
Embodiment 3
When carrying out optical tests, default performance number is set to 3mw, after carrying out test a period of time, as shown in Figure 5, real power value in laser instrument will change along with the change of temperature, and then affect current value, make the power of laser instrument no longer constant, the Influence on test result of such testing of alignment is very large;
And adopt the power invariability method of laser instrument of the present invention, as shown in Figure 6, when preset performance number be 3mw time, the current value in laser instrument along with its change of change of temperature very small, therefore its power ratio is more constant; In addition, performance number is also preset as 0.1mw, 0.5mw, 1mw, 5mw, 10mw by the present embodiment 3, as seen from Figure 6, no matter adopt the performance number which kind of is preset, through laser instrument of the present invention power invariability method measure after, the current value in its laser instrument along with the change of temperature very small, because of real power value and current value proportional, thus the change of its actual performance number is also very small, does not affect carrying out continuously of optical tests completely.
Compared with prior art, the power invariability system and method for a kind of laser instrument described in the application, reaches following effect:
(1) the power invariability system of laser instrument of the present invention, comprise: laser instrument, optical splitter, photoelectric commutator, signal converter, data processor and power governor, arrange rationally, thus the power that laser instrument sends is regulated, make that the luminous power of laser instrument is stable, cost is low, and the power that laser instrument consumes is little;
(2) the power invariability system of laser instrument of the present invention, also comprise: temperature detector, this temperature detector can the real time temperature of accurate response photoelectric commutator and external environment condition, compares, avoid the situation of luminous power instability with ambient temperature;
(3) the power invariability method of laser instrument of the present invention, its step is simple, the luminous power of laser instrument can be made to be controlled effectively, to adopt the method for High Speed Analog amplification and real-time sampling, the power that laser instrument sends can be obtained in time, accurately.
Because method part has been described in detail the embodiment of the present application, the expansion of the System and method for corresponding part related in embodiment is described omit here, repeat no more.Description for particular content in system can the content of reference method embodiment, no longer specifically limits here.
Above-mentioned explanation illustrate and describes some preferred embodiments of the application, but as previously mentioned, be to be understood that the application is not limited to the form disclosed by this paper, should not regard the eliminating to other embodiments as, and can be used for other combinations various, amendment and environment, and can in application contemplated scope described herein, changed by the technology of above-mentioned instruction or association area or knowledge.And the change that those skilled in the art carry out and change do not depart from the spirit and scope of the application, then all should in the protection domain of the application's claims.
Claims (10)
1. a power invariability system for laser instrument, is characterized in that, comprising: laser instrument, optical splitter, photoelectric commutator, signal converter, data processor, temperature detector and power governor, wherein,
Described optical splitter, for the light signal launched in described laser instrument is divided into two parts with the ratio of A:B, and is sent to photoelectric commutator by the light signal of B ratio;
Described photoelectric commutator, converts electric signal to for the light signal sent by described optical splitter, and this electric signal is sent to signal converter;
Described signal converter, is sent to data processor for this electric signal is converted to data;
Described data processor, for receiving the data that described signal converter sends, and calculates the real power that laser instrument sends, and is sent in described power governor by this real power;
Described temperature detector, for accurately detecting the real time temperature of photoelectric commutator and external environment condition, and contrasts with ambient temperature;
Described power governor, according to the real power that data processor calculates, regulates the performance number preset in laser instrument, to determine the luminous power of laser instrument.
2. the power invariability system of laser instrument according to claim 1, is characterized in that, described A:B is 99:1, and the light signal of 1% is sent to described photoelectric commutator.
3. the power invariability system of laser instrument according to claim 1, is characterized in that, described signal converter, comprises further: amplifying circuit, filtering circuit, voltage calibration circuit and analog to digital converter, wherein,
Described amplifying circuit, for amplifying signal, electric current and voltage;
Described filtering circuit, for being connected with described amplifying circuit, filters out effective electric signal, and this effective electric signal is sent to analog to digital converter;
Described voltage calibration circuit, for calibrating the offset voltage variation with temperature in described signal converter;
Described analog to digital converter, for converting described effective electric signal to data, is sent to described data processor.
4. the power invariability system of laser instrument according to claim 1, is characterized in that, described data processor is: arm processor further.
5. the power invariability system of laser instrument according to claim 1, is characterized in that, described power governor, comprises further: digital to analog converter, current calibration circuit, current control circuit and driving circuit, wherein,
Described digital to analog converter, for described real power value is converted to electric signal, and is sent to current control circuit by this electric signal;
Described current calibration circuit, for providing correcting current curve for described current control circuit;
Described current control circuit, is converted to current value for the electric signal transmitted by digital to analog converter, the theoretical value on this current value and correcting current curve is contrasted, and current value is sent to described driving circuit;
Described driving circuit, for the current value of received current control circuit, and regulates according to the predetermined power value of this current value to laser instrument, determines the luminous power of laser instrument.
6. the power invariability system of laser instrument according to claim 1, is characterized in that, described temperature sensor is, temperature sensor further.
7. the power invariability system of laser instrument according to claim 3, is characterized in that, described amplifying circuit comprises trans-impedance amplifier, voltage amplifier and signal amplifier further.
Described filtering circuit, comprises RC wave filter, low-pass filter and bandpass filter further.
8. a power invariability method for laser instrument, is characterized in that, comprise the following steps:
Step 1: the light signal launched in described laser instrument is divided into two parts with the ratio of A:B by optical splitter, and the light signal of B ratio is sent to photoelectric commutator;
Step 2: photoelectric commutator converts the light signal that described optical splitter sends to electric signal, and this electric signal is sent to signal converter;
Step 3: this electric signal is converted to data and is sent to data processor by signal converter;
Step 4: data processor receives the data that described signal converter sends, and calculate the real power that laser instrument sends, and real power value is sent in described power governor;
Step 5: temperature detector accurately detects the real time temperature of photoelectric commutator and external environment condition, and contrasts with ambient temperature;
Step 6: the real power that power governor calculates according to data processor, regulates the performance number preset in laser instrument, to determine the luminous power of laser instrument.
9. the power invariability method of laser instrument according to claim 8, is characterized in that, described step 3 also comprises:
Step 3.1: signal, electric current and voltage amplify by amplifying circuit;
Step 3.2: filtering circuit and described amplifying circuit connect, and filter out effective electric signal, and this effective electric signal is sent to analog to digital converter;
Step 3.3: voltage calibration circuit is calibrated the offset voltage variation with temperature in described signal converter;
Step 3.4: analog to digital converter converts described effective electric signal to data, is sent to described data processor.
10. the power invariability method of laser instrument according to claim 8, is characterized in that, described step 6 also comprises:
Real power value is converted to electric signal by step 6.1 digital to analog converter, and this electric signal is sent to current control circuit;
Step 6.2: correcting current curve is sent to described current control circuit by current calibration circuit;
Step 6.3: the electric signal that described digital to analog converter transmits is converted to current value by described current control circuit, and the theoretical value on this current value and correcting current curve is contrasted, current value is sent to driving circuit;
The current value of step 6.4 driving circuit received current control circuit, and regulate according to the predetermined power value of this current value to laser instrument, to determine the luminous power of laser instrument.
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