CN101093166A - Device for controlling average wavelength of light source in broad spectrum based on monitoring detector - Google Patents

Abstract

A device used for controlling average wavelength of broadband optical source based on monitoring detector consists of SFS optical source, monitoring detector, temperature transducer, microprocessor, optical signal collection circuit, D/A conversion circuit and constant-current source circuit. It is featured as forming said optical signal collection circuit by I/V conversion circuit and voltage comparison circuit, embedding temperature compensation model in said microprocessor and converting 5% of optical signal outputted from SFS optical source by said monitoring detector.

Description

Control device based on the average wavelength of light source in broad spectrum of monitoring detector

Technical field

The present invention relates to a kind of wide spectrum light source of using on the optical fibre gyro that is applicable to, more particularly say, be meant a kind of according to the voltage of monitoring detector output and the relation of average wavelength of light source, utilize negative-feedback principle to adjust the drive current of light source, control the mean wavelength of light source, the present invention adopts the stability that improves average wavelength of light source in broad spectrum based on the control device of the average wavelength of light source in broad spectrum of monitoring detector.

Background technology

Erbium-doped super-fluorescent optical fiber source (SFS, Superfluorescent Fiber Source) be a kind of wideband light source based on amplified spont-aneous emission (ASE) in the Er-doped fiber (EDF), the spectrum that has become in optical device in the dense wavelength division multiplexing system (as EDFA, fiber grating and other optical passive component) test, Fibre Optical Sensor and optical fibre gyro and the Access Network is cut apart the important light source that multi-wavelength system is used.Referring to after the round trip shown in Figure 1 to SFS (band frame of broken lines part), select reverberator 104 to form by pump laser 101, wavelength division multiplexer 102, Er-doped fiber 103, gain flattening filter 105, optical isolator 106, wavelength.Pump laser 101 is the semiconductor laser that has the frequency stabilization grating of 980nm for output wavelength, and gain flattening filter 105 makes the ASE spectrum flatness of output; Optical isolator 106 is used to eliminate the influence of feedback light, can reduce the noise of EDFA simultaneously; Wavelength is selected the light of the required wave band of reverberator 104 reflections, improves Output optical power, improves spectral characteristic.Therefore, be used as the preferred light source of inertial navigation level high-precision optical fiber gyro after the round trip to SFS.Because inertial navigation level high-precision optical fiber gyro operating temperature range very wide (45 ℃～+ 70 ℃), require used average wavelength of light source highly stable, therefore the inventor of present patent application proposes a kind of according to the voltage of monitoring detector output and the variation relation with environment temperature of SFS average wavelength of light source, utilize negative-feedback principle to adjust the drive current of SFS light source, control the mean wavelength of SFS light source, thereby improve the stability of SFS average wavelength of light source.

Summary of the invention

The control device that the purpose of this invention is to provide a kind of average wavelength of light source in broad spectrum based on monitoring detector, mainly contain controlled device SFS light source, temperature sensor, D/A change-over circuit, microprocessor, monitoring detector (MD), I/V change-over circuit, voltage comparator circuit, constant current source driving circuit, I/V change-over circuit and voltage comparator circuit constitute the light signal collection circuit; Be embedded with model of temperature compensation J in the described microprocessor ₀(T).

In the present invention, 5% light signal that monitoring detector is exported light to the SFS light source that receives is changed the acquisition current signal, and described current signal is output voltage signal V after the conversion of I/V change-over circuit ₁Give voltage comparator circuit; Temperature sensor is used to gather the temperature under the SFS light source works environment, and promptly the output environment temperature T is given microprocessor; Microprocessor according to the environment temperature T that receives according to model of temperature compensation J ₀(T) calculate acquisition reference voltage signal V _D, described reference voltage V _DOutput analog voltage signal V after the digital-to-analog conversion of D/A converter B passage ₀Give voltage comparator circuit; The voltage signal V of voltage comparator circuit to receiving ₁With analog voltage signal V ₀Carry out difference and relatively obtain voltage deviation signal V ₂After export to microprocessor; The described voltage deviation signal V of microprocessor to receiving ₂Behind A/D converter, digital filter on the sheet, convert digital voltage signal f to ₀Described then digital voltage signal f ₀Handle back outputting drive voltage signal f by pid control algorithm ₁Give the D/A converter A channel; The drive voltage signal f of D/A converter A channel to receiving ₁Carry out exporting analog voltage signal V after the digital-to-analog conversion _A, described analog voltage signal V _AAct on the control SFS light source through output driving current signal I behind the constant-current source circuit.

The advantage of control device that the present invention is based on the average wavelength of light source in broad spectrum of monitoring detector is:

(1) change and cause the increase of the mean wavelength of Er-Doped superfluorescent fiber source SFS as ambient temperature T, control device then of the present invention can be adjusted drive current according to changing opposite direction with output, and the mean wavelength of SFS is reduced.When ambient temperature changes and causes reducing of Er-Doped superfluorescent fiber source SFS output mean wavelength, control device then of the present invention can be adjusted drive current according to changing opposite direction with output, and SFS output mean wavelength is increased.Thereby guaranteed the stable of output average light wavelength.

(2) control device of the present invention has that temperature controlling range is wide, measurement and control accuracy and integrated level height, has effectively reduced the power consumption of light source and the thermal value of power device, reduces power device to the light source Effect on Performance.

(3) digital control is adopted in negative feedback control, and control mode is versatile and flexible, and it is convenient to improve.

(4) control device adopts the control mode of variable reference, has compensated the influence of environment temperature to the SFS light source, has improved the mean wavelength stability of SFS light source, and environment temperature is under-45 ℃～70 ℃ conditions, and the mean wavelength precision of SFS light source can reach 1 * 10 ^-6/ ℃ below.

(5) employing is based on the control device of the average wavelength of light source in broad spectrum of monitoring detector 3, microprocessor is selected the C8051F060 mixed signal ISP-FLASH microcontroller that Silabs company releases for use in the device, it is integrated on chip piece to constitute a single-chip data sampling or the needed nearly all analog-and digital-peripheral hardware of control system and other functional part, reduced the quantity of peripheral hardware chip, simplify the design of circuit board, reduce cost, and 16 integrated high-speed A/D converters can satisfy the requirement of system accuracy on the sheet.

(6) monitoring detector is selected beam split 5% monitoring detector of PHOTOP company for use in the control device, and the effect of integrated beam split and monitoring light source output power has reduced the influence of environment temperature optical device.

(7) the single wire digital formula temperature sensor DS18B20 that temperature sensor adopts U.S. DALLAS company to produce in the control device, it has microminiaturization, low-power consumption, high-performance, antijamming capability and by force, easily joins advantages such as microprocessor, can directly become serial digital signal to handle temperature inversion.

(8) constant-current source circuit in the control device drives for the high precision adjustable current source, constitute the high-accuracy and constant potential source by high-precision high-speed D/A and mu balanced circuit, by baric flow conversion (being the V-I conversion) circuit, produce the adjustable drive current of high precision, the Current Regulation dynamic range is big, precision is high.

Description of drawings

Fig. 1 is the structured flowchart of control device of the present invention.

Fig. 2 is the interior signal flow block diagram of the sheet of microprocessor.

Fig. 3 A be environment temperature T under-45 ℃～70 ℃ conditions, the mean wavelength λ of SFS light source is with the variation of environment temperature T.

Fig. 3 B be environment temperature T under-45 ℃～70 ℃ conditions, model of temperature compensation J ₀(T) with the variation of environment temperature T.

Fig. 3 C be environment temperature T under-45 ℃～70 ℃ conditions, the mean wavelength λ of the SFS light source after the compensation is with the variation of environment temperature T.

Fig. 4 A is the circuit theory diagrams of microprocessor chip.

Fig. 4 B is the circuit theory diagrams of binary channels D/A converter.

Fig. 4 C is the circuit theory diagrams of power-switching circuit.

Fig. 4 D is the circuit theory diagrams of temperature sensor.

Fig. 4 E is the circuit theory diagrams of constant-current source circuit.

Fig. 4 F is the circuit theory diagrams of light signal collection circuit.

Among the figure: 1. after the round trip to SFS light source 101. pump lasers 102. wavelength division multiplexers 103. Er-doped fibers 104. reverberators 105. wave filters 106. isolators 2. microprocessors 3. monitoring detector 4.I/V change-over circuits 5. temperature sensors 6. voltage comparator circuits 7. constant-current source circuit 8.D/A converter A channel 9.D/A converter B passages

Embodiment

The present invention is described in further detail below in conjunction with drawings and Examples.

Referring to shown in Figure 1, the present invention is a kind of control device of the average wavelength of light source in broad spectrum based on monitoring detector, mainly contain controlled device SFS light source 1, temperature sensor 5, D/A change-over circuit (employing binary channels D/A converter, for convenience of explanation to signal Processing, in the present invention it is divided into D/A converter A channel 8, D/A converter B passage 9, selects the DAC8532 chip for use), microprocessor 2, monitoring detector (MD) 3, I/V change-over circuit 4, voltage comparator circuit 6, constant current source driving circuit 7; I/V change-over circuit 4 and voltage comparator circuit 6 constitute the light signal collection circuit; Be embedded with model of temperature compensation J in the described microprocessor 2 ₀(T).

In the present invention, the tail optical fiber of the fibre optic isolater 106 in the SFS light source 1 and monitoring detector 3 go into fine welding (being used for giving monitoring detector 3) with 5% light signal of SFS light source 1 output light, the tail optical fiber of monitoring detector 3 is connected with spectroanalysis instrument (model AQ6319 spectroanalysis instrument), is used for 95% light signal is tested; Behind monitoring detector 3 current signal of output be treated to following explanation:

5% light signal of the SFS light source 1 output light of 3 pairs of receptions of monitoring detector is changed the acquisition current signal, and described current signal is output voltage signal V after 4 conversions of I/V change-over circuit ₁Give voltage comparator circuit 6;

Temperature sensor 5 is used to gather the temperature under SFS light source 1 working environment, and promptly the output environment temperature T is given microprocessor 2;

Microprocessor 2 according to the environment temperature T that receives according to model of temperature compensation J ₀(T) calculate acquisition reference voltage signal V _D, described reference voltage V _DOutput analog voltage signal V after the digital-to-analog conversion of D/A converter B passage 9 ₀Give voltage comparator circuit 6;

The voltage signal V of 6 pairs of receptions of voltage comparator circuit ₁With analog voltage signal V ₀Carry out difference and relatively obtain voltage deviation signal V ₂After export to microprocessor 2;

The described voltage deviation signal V of 2 pairs of receptions of microprocessor ₂Behind A/D converter, digital filter on the sheet, convert digital voltage signal f to ₀Described then digital voltage signal f ₀Handle back outputting drive voltage signal f by pid control algorithm ₁Give D/A converter A channel 8;

The drive voltage signal f of 8 pairs of receptions of D/A converter A channel ₁Carry out exporting analog voltage signal V after the digital-to-analog conversion _A, described analog voltage signal V _AAct on the control SFS light source 1 through output driving current signal I behind the constant-current source circuit 7.

The control device of the average wavelength of light source in broad spectrum based on monitoring detector of the present invention mainly is the voltage signal V of output current behind I/V change-over circuit 4 according to monitoring detector (MD) 3 ₁Relation with the mean wavelength λ of SFS light source 1 output, change the reference voltage value (with the then also variation thereupon of reference voltage value of variation of environment temperature T) of microprocessor 2 outputs, utilize negative-feedback principle to adjust the drive current I of light source automatically, thus the mean wavelength λ of control SFS light source 1.

In the present invention, according to the responsiveness R=I/p of monitoring detector 3, it has shown the input-output characteristic of monitoring detector 3.Then have:

$R=\frac{I_0}{P}=\frac{N_e}{N_p}\×\frac{\mathrm{\λ}}{\mathrm{hc}}=\frac{\mathrm{\η}}{1248}\×\mathrm{\λ}---\left(1\right)$

V＝K×P×λ＝J×λ (2)

When environment temperature T changes, then have:

V(T)＝K×P(T)×λ＝J(T)×λ (3)

Constant for the mean wavelength that guarantees 1 output of SFS light source, then have:

V+ΔV(T)＝λ(J+ΔJ(T)) (4)

ΔV(T)＝λ×ΔJ(T) (5)

When environment temperature T changes, cause the variation of the mean wavelength λ of SFS light source 1, can change the variation of the mean wavelength of SFS light source 1 in the present invention by the drive current I that changes SFS light source 1.Therefore reflected the variation of SFS light source 1 Output optical power P according to the variation of monitoring detector 3 output voltages, by the temperature characterisitic of monitoring detector 3 as can be known, responsiveness R is directly proportional with environment temperature T, thereby the mean wavelength λ of SFS light source 1 also is directly proportional with environment temperature T.By formula (4), formula (5) as can be known, make the mean wavelength λ of SFS light source 1 keep constant, then should compensate the variation of the feedback voltage that causes because of environment temperature T, so can be by setting up model of temperature compensation J ₀(T), i.e. output voltage signal V after I/V change-over circuit 4 conversions ₁, mean wavelength λ and environment temperature T relation, change the reference voltage V of the output of microprocessor 2 by environment temperature T _D, make reference voltage V _DWith I/V change-over circuit 4 conversion back output voltage signal V ₁Keep constant.

Can draw model of temperature compensation J by above principle ₀(T) establishment step is:

First step: the environment temperature T that is recorded by temperature sensor 5 is under-45 ℃～70 ℃ conditions, and the mean wavelength λ of SFS light source 1 is with the variation relation f (T) of environment temperature T, and being defined as first curved line relation is λ=f (T);

Second step: 5% light signal of 3 pairs of SFS light sources of monitoring detector, 1 output light is output voltage signal V after 4 conversions of I/V change-over circuit ₁, the mean wavelength λ and the described voltage signal V of SFS light source 1 are then arranged ₁Variation relation J (T) with environment temperature T is defined as second curved line relation $J\left(T\right)=\frac{{\mathrm{<figure-callout\; id="1"\; label="V"\; filenames="A20071012013700221.png"\; state="\{\{state\}\}">V</figure-callout>}}_1}{\mathrm{\&lambda;}\left(T\right)};$

Third step: adopt the non-linear method second curved line relation J (T) that fits to fit, obtain model of temperature compensation J ₀(T)=A+BT+CT ², wherein, A represents that first fits coefficient, and B represents that second fits coefficient, and C represents that the 3rd fits coefficient, and first fits coefficient A, second and fit coefficient B, the 3rd to fit the coefficient of coefficient C inequality; First fits coefficient A, second fits coefficient B and the 3rd and fits coefficient C and adopt the match of origin software to obtain;

The 4th step: according to model of temperature compensation J ₀(T)=A+BT+CT ²Calculate offset Δ V _Ref(T)=λ ₀J ₀(T)-V _λ

In the present invention, the C8051F060 mixed signal ISP-FLASH microcontroller that microprocessor 2 selects for use Silabs company to release, it is integrated on chip piece to constitute a single-chip data sampling or the needed nearly all analog-and digital-peripheral hardware of control system and other functional part, reduced the quantity of peripheral hardware chip, simplify the design of circuit board, reduce cost, and 16 integrated high-speed A/D converters can satisfy the requirement of system accuracy on the sheet.Monitoring detector 3 is selected beam split 5% monitoring detector of PHOTOP company for use, the effect of integrated beam split and monitoring light source output power.The single wire digital formula temperature sensor DS18B20 that temperature sensor 5 adopts U.S. DALLAS company to produce, it has microminiaturization, low-power consumption, high-performance, antijamming capability and by force, easily joins advantages such as microprocessor, can directly become serial digital signal to handle temperature inversion, and by standard RS232 interface collecting temperature data.

In the present invention, microprocessor 2 is finished the protection of SFS light source 1, collection, judgement, the setting of reference value and the drive current of control light source of signal.Its system flowchart as shown in Figure 2, the treatment step in microprocessor comprises:

(A) to the initialized step of SFS light source driving circuit;

(B) the protection part of the voltage of unlatching of SFS light source and shutoff and external interference generation, current surge impact;

(C) to the initialized step of light signal collection circuit;

(D) to the initialized step of temperature sensor;

(E) microprocessor carries out the step of digital filtering on the sheet to collecting signal;

(F) step of the reference value that calculates according to model of temperature compensation;

(G) the voltage deviation value is carried out the treatment step of pid control algorithm.

In the present invention, the light signal collection circuit comprises I/V change-over circuit 4 and voltage comparator circuit 6, wherein I/V change-over circuit 4 is a single order low-pass filtering amplifying circuit, because the output signal of monitoring detector 3 is less, have simultaneously the optical noise signal again, therefore the method that adopts filtering to amplify is in the present invention amplified the output signal process of monitoring detector 3, filtering simultaneously, output voltage signal.Voltage comparator circuit 6 is that the collection value of luminous power is compared with reference value, and the output bias value is enlarged into the voltage signal of 0～2.5V with it, gathers so that microprocessor 2 carries out A/D, and wherein reference value is to adjust by the temperature model of setting up.The connection of each terminal is shown in Fig. 4 F, and the inverting input 6 of operational amplifier N2B connects with the light intensity current signal end of monitoring detector 3 outputs in the I/V change-over circuit 4; Resistance R 35 1 ends connect the inverting input 6 of operational amplifier N2B, and the other end connects the output terminal 7 of operational amplifier N2B, and resistance R 35 is the feedback resistance of operational amplifier N2B; Capacitor C 58 1 ends connect the inverting input 6 of operational amplifier N2B, and the other end connects the output terminal 7 of operational amplifier N2B; Resistance R 36 1 ends connect the input end 5 of operational amplifier, resistance R 36 other end analogue grounds; Capacitor C 59 1 ends connect the positive input 5 of operational amplifier, capacitor C 59 other end analogue grounds; The output terminal 7 of operational amplifier N2B connects after resistance R 39 with the inverting input 2 of operational amplifier N2A and connects; The analog control voltage signal end of B passage 9 outputs of D/A converter connects with resistance R 38 1 ends, the reverse input end 2 of operational amplifier N2A in resistance R 38 other ends and the voltage comparator circuit 6 connects, capacitor C 60 1 ends are connected on the analog control voltage signal end of B passage 9 output of D/A converter, capacitor C 60 another terminations simulation ground; The output terminal 1 of operational amplifier N2A connects with resistance R 40 1 ends, and resistance R 40 other ends connect with an end of resistance R 42, and the other end of resistance R 42 connects with capacitor C 61 1 ends, another termination simulation ground of capacitor C 61; One end of resistance R 37 connects the reverse input end 2 of operational amplifier N2A, and resistance R 37 other ends are connected between resistance R 40 and the resistance R 42, and wherein resistance R 37 is the feedback resistance of operational amplifier N2A; The positive pole of stabilivolt V3 connects simulation ground, and negative pole connects with an end of resistance R 40; Capacitor C 56 1 ends connect with the positive power source terminal 8 of operational amplifier N2A, another termination simulation ground; Capacitor C 57 1 ends connect with the negative power end 4 of operational amplifier N2A, another termination simulation ground; One end of resistance R 41 connects with the positive input 3 of operational amplifier N2A, another termination simulation ground of resistance R 41; The output terminal of operational amplifier N2A connects with the end of little process chip D2 18; The positive power source terminal 8 of operational amplifier N2A connects+the 5V power supply, and the negative power end 4 of operational amplifier N2A connects-the 5V power supply.

The single wire digital formula DS18B20 temperature sensor that temperature sensor 5 adopts U.S. DALLAS company to produce, temperature sensor 5 is connected with standard I/O mouth to microprocessor 2, the connection of each terminal is shown in Fig. 4 D, the power end 3 of temperature sensor chip D5 connects with the digital voltage end D3.3 of power-switching circuit V2 output, 1 termination digitally, data output end 2 connects with the end 29 of little process chip D2, be in series with resistance R 26 between data output end 2 and the power end 3, wherein R26 is a pull-up resistor, when bus was idle, its state was a high level.

The D/A change-over circuit adopts 16 binary channels DAC8532 chips and peripheral circuit to form, the D/A change-over circuit converts the digital signal of microprocessor output to simulating signal, the connection of each terminal is shown in Fig. 4 B, the end 8 of binary channels D/A conversion chip D3 connects simulation ground, data input pin 7, input end of clock 6, Enable Pin 5 respectively with the end 41 of microprocessor chip D2, end 40, end 39 connects, D/A output terminal 4 connects with the end 2 of constant current source N5A after resistance R 51, D/A output terminal 3 connects with the reverse input end 2 of operational amplifier N2A after resistance R 38,2 terminations+2.5V voltage, and capacitor C 3, capacitor C 4 be connected in parallel on simulation and 2 ends between, 1 termination+5V voltage, and capacitor C 1, capacitor C 2 is connected in parallel between simulation ground and 1 end.

Constant-current source circuit 7 drives for the high precision adjustable current source, constitute the high-accuracy and constant potential source by high-precision high-speed D/A and mu balanced circuit, by baric flow conversion (being the V-I conversion) circuit, produce the adjustable drive current of high precision, for SFS light source 1 provides stable electric current output, make light source output power stable, its electric current adjustable extent is 0～400mA.The connection of each terminal is shown in Fig. 4 E, the input end 2 of voltage transitions chip N4 in the constant-current source circuit connects+the 5V power supply, 4 terminations simulation ground, output terminal 6 output+2.5V voltages are given the positive input 3 of operational amplifier N5A, the output terminal 1 of operational amplifier N5A connects with the reverse input end 6 of operational amplifier N5B after resistance R 54, the output terminal 7 of operational amplifier N5B connects with the base stage of triode V5, the collector of triode V5 connects simulation ground, the emitter of triode V5 connects with resistance R 58 1 ends, resistance R 58 other ends be connected in the SFS light source (1) LD pumping source (101) on, the end 4 of binary channels D/A conversion chip D3 is connected in the reverse input end 2 of operational amplifier N5A after resistance R 51; Capacitor C 62 1 end connection+5V power supplys, capacitor C 62 another termination simulation ground, the positive termination+2.5V of capacitor C 63, capacitor C 63 another termination simulation ground, capacitor C 64 1 terminations+2.5V, capacitor C 64 another termination simulation ground; Resistance R 52 1 ends connect with the inverting input 2 of operational amplifier N5A, and resistance R 52 other ends connect the output terminal 1 of operational amplifier N5B, and resistance R 52 is the feedback resistance of operational amplifier N5A; Resistance R 56 1 ends connect with the inverting input 6 of operational amplifier N5B, and the other end connects the emitter of triode V5, and resistance R 56 is the feedback resistance of operational amplifier N5B; The power end 8 of operational amplifier N5A connects+5V, 4 terminations simulation ground, capacitor C 65 1 end connection+5V power supplys, capacitor C 65 other ends connect simulation ground, resistance R 55 1 terminations+2.5V, the normal phase input end 5 of another termination operational amplifier N5B, the normal phase input end 5 of capacitor C 69 1 termination operational amplifier N5B, capacitor C 69 another termination simulation ground; Resistance R 50 1 ends are connected in the end 4 of binary channels D/A conversion chip D3, another termination simulation ground; Resistance R 53 1 ends connect the reverse input end 2 of operational amplifier N5A, resistance R 53 other ends connect the LD pumping source (101) in the SFS light source (1), capacitor C 67 1 ends connect the LD pumping source (101) in the SFS light source (1), other end connection+5V the power supply of capacitor C 67, positive termination+the 5V of capacitor C 68, the other end of capacitor C 68 connects the LD pumping source (101) in the SFS light source (1), capacitor C 66 positive termination+5V, another termination simulation ground of capacitor C 66.

Power-switching circuit general+5V is converted to+3.3V, the connection of each terminal is shown in Fig. 4 C, power-switching circuit general+5V is converted to+3.3V, the power end 2 connection+5V of power conversion chip V2,1 termination simulation ground, output terminal 3 connects an end of inductance L 3, the other end output digital voltage 3.3V of inductance L 3, output terminal 3 connects an end of inductance L 4, the other end output aanalogvoltage 3.3V of inductance L 4, the output terminal 3 of capacitor C 51 1 end joining power conversion chip V2, capacitor C 51 another termination simulation ground, the analog output voltage 3.3V of the anode joining power conversion chip V2 of capacitor C 52, another termination simulation ground of capacitor C 52.

The connection of each terminal of microprocessor 2 and peripheral circuit thereof is shown in Fig. 4 A, the end 2 of microprocessor chip D2, end 6, end 21 connection+2.5V power supplys, end 3, end 7, end 8, end 10, end 12, end 14, end 15, end 17, end 19, end 20, end 23 connects simulation ground, end 5 connects digitally after capacitor C 42, end 11, end 13, end 16, end 24 meets the aanalogvoltage A3.3 of power-switching circuit output, capacitor C 53 1 termination end 24, capacitor C 53 another termination simulation ground, end 22 connects digitally after capacitor C 41, end 28 meets the digital voltage D3.3 of power-switching circuit output, end 37 meets the digital voltage D3.3 of power-switching circuit output, end 38 connects digitally, and hold 37 and end be connected with capacitor C 45 between 38, end 39, end 40, end 41 is respectively through resistance R 20, resistance R 21, connect after the resistance R 22+the 5V power supply, end 63 connects digitally, end 64 meets the digital voltage D3.3 of power-switching circuit output, and hold 63 and end be connected with capacitor C 44 between 64, end 89 connects digitally, end 90 meets the digital voltage D3.3 of power-switching circuit output, and hold 89 and end be connected with capacitor C 43 between 90, end 96, end 97, end 98, end 99 is as the external debug interface, and hold 97 and the digital voltage D3.3 of power-switching circuit output between be connected with resistance R 24, the end 100 respectively with resistance R 23, capacitor C 39 1 ends connect, capacitor C 39 another terminations digitally, resistance R 23 another termination+5V power supplys, capacitor C 40 are connected in+the 5V power supply and digitally between.

When variation of ambient temperature, digital temperature sensor 5 calculates offset Δ V according to the environment temperature T that records _Ref(T), when environment temperature T was higher than 20 ± 2 ℃ of design temperatures, the mean wavelength λ of SFS light source 1 output light can raise, according to model of temperature compensation J ₀(T) offset value calculation Δ V _Ref(T), offset Δ V is then arranged _Ref(T) reduce; SFS light source 1 is exported light signal after monitoring detector 3 and light signal collection processing of circuit, deviate V _DRaise, by PID control in the sheet of microprocessor 2, then reduce the output of drive current I, thereby increase the mean wavelength λ of SFS light source 1, otherwise, when temperature is lower than setting value, then increase the output of drive current I, reduce the mean wavelength λ of SFS light source 1, make the mean wavelength of SFS light source 1 output light keep stable.

Embodiment 1:

According to the connection of carrying out each device shown in Figure 1, the tail optical fiber with monitoring detector 3 is connected with spectroanalysis instrument (model AQ6319 spectroanalysis instrument) then; Between voltage comparator circuit 6 and I/V change-over circuit 4, be connected a multi pass acquisition voltage table (the 34970A voltage table of producing with agilent company), be used to measure the magnitude of voltage of I/V change-over circuit 4 outputs; Gather environment temperature T in real time under-45 ℃～70 ℃ conditions with temperature sensor 5, the mean wavelength λ of SFS light source 1 is with the variation relation f (T) of environment temperature T, and being defined as first curved line relation is λ=f (T), shown in Fig. 3 A; Mean wavelength λ changes between 1.54525 μ m～1.54563 μ m among the figure, and its variable quantity is 2.00 * 10 ^-6/ ℃.The temperature stability of general average wavelength of light source is estimated with the fluctuation amplitude of environment temperature T with mean wavelength, total and range of temperature be 115 ℃, then pass through $\frac{{\mathrm{\&lambda;}}_{\max }-{\mathrm{\&lambda;}}_{\min }}{{\mathrm{\&lambda;}}_{0}T}\&times;100\%$ Obtain the variable quantity of mean wavelength λ, wherein λ with environment temperature T _Max, λ _MinAnd λ ₀Maximal value, minimum value and the environment temperature of representing mean wavelength respectively is 22 ℃ mean wave long value.

5% light signal of 3 pairs of SFS light sources of monitoring detector, 1 output light is output voltage signal V after 4 conversions of I/V change-over circuit ₁, the mean wavelength λ and the described voltage signal V of SFS light source 1 are then arranged ₁Variation relation J (T) with environment temperature T is defined as second curved line relation $J\left(T\right)=\frac{{\mathrm{<figure-callout\; id="1"\; label="V"\; filenames="A20071012013700221.png"\; state="\{\{state\}\}">V</figure-callout>}}_1}{\mathrm{\&lambda;}\left(T\right)},$ Mean wave long value λ is then arranged ₀Be 1.545503 μ m, output voltage values V _λBe 1.798V; Adopt the non-linear method (origin software) that fits that the second curved line relation J (T) is fitted, obtain model of temperature compensation J ₀(T)=A+BT+CT ²=1.16406+2.7237 * 10 ^-6T+1.4244 * 10 ^-8T ², fit curve referring to shown in Fig. 3 B.

According to model of temperature compensation J ₀(T)=A+BT+CT ²=1.16406+2.7237 * 10 ^-6T+1.4244 * 10 ^-8T ²Calculate offset Δ V _Ref(T)=λ ₀J ₀(T)-V _λ=1.545503 * (1.16406+2.7237 * 10 ^-6T+1.4244 * 10 ^-8T ²)-1.798 write this offset in the storer of microprocessor 2 then.According to model of temperature compensation J of the present invention ₀(T) can obtain the curve of the mean wavelength λ of SFS light source 1, shown in Fig. 3 C with environment temperature T variation.Mean wavelength λ changes between 1.54529 μ m～1.54547 μ m among the figure, and its variable quantity is 0.87 * 10 ^-6/ ℃.The temperature stability of general average wavelength of light source is estimated with the fluctuation amplitude of environment temperature T with mean wavelength, total and range of temperature be 115 ℃, then pass through $\frac{{\mathrm{\&lambda;}}_{\max }-{\mathrm{\&lambda;}}_{\min }}{{\mathrm{\&lambda;}}_{0}T}\&times;100\%$ Obtain the variable quantity of mean wavelength λ, wherein λ with environment temperature T _Max, λ _MinAnd λ ₀Maximal value, minimum value and the environment temperature of representing mean wavelength respectively is 22 ℃ mean wave long value.

The physical significance of quotation mark is described as follows table among the present invention:

λ	The mean wavelength of expression SFS light source 1 is abbreviated as mean wavelength.
		λ 0	The mean wave long value of expression SFS light source 1 when 20 ± 2 ℃ of design temperatures.
T	The operating ambient temperature of the SFS light source 1 that the expression temperature sensor collects is abbreviated as environment temperature.
		J 0(T)	Be illustrated under the environment temperature T condition voltage signal V that the current signal of monitoring detector 3 outputs is exported behind I/V change-over circuit 4 1And the relation between the mean wavelength λ is abbreviated as model of temperature compensation.
R	The responsiveness of expression monitoring detector 3.
		I 0	The current value of expression monitoring detector 3 outputs.
P	The luminous power of expression SFS light source 1 output.
		P (T)	The luminous power with environment temperature T variation of expression SFS light source 1 output is abbreviated as the temperature variation luminous power.
N e	The quantity of the electronics that expression monitoring detector 3 produces.
		N P	Expression SFS light source 1 is incident upon the quantity of the photon in the monitoring detector 3.
h	The expression Planck's constant.
		c	The expression ray velocity.
η	The expression quantum efficiency.
		V	The magnitude of voltage of expression I/V change-over circuit 4 outputs.
V λ	Be illustrated in mean wave long value λ 0The time I/V change-over circuit 4 outputs magnitude of voltage.
		V (T)	The magnitude of voltage with environment temperature T variation of expression I/V change-over circuit 4 outputs.

Claims (4)

1, a kind of control device of the average wavelength of light source in broad spectrum based on monitoring detector, include SFS light source (1), monitoring detector (3), it is characterized in that: also include microprocessor (2), temperature sensor (5), light signal collection circuit, D/A change-over circuit, constant-current source circuit, described light signal collection circuit is made of I/V change-over circuit (4) and voltage comparator circuit (6), and described microprocessor is embedded with model of temperature compensation J in (2) ₀(T);

5% light signal that monitoring detector (3) is exported light to the SFS light source (1) that receives is changed the acquisition current signal, and described current signal is output voltage signal V after I/V change-over circuit (4) conversion ₁Give voltage comparator circuit (6);

Temperature sensor (5) is used to gather the temperature under SFS light source (1) working environment, and promptly the output environment temperature T is given microprocessor (2);

Microprocessor (2) according to the environment temperature T that receives according to model of temperature compensation J ₀(T) calculate acquisition reference voltage signal V _D, described reference voltage V _DOutput analog voltage signal V after the digital-to-analog conversion of D/A converter B passage (9) ₀Give voltage comparator circuit (6);

The voltage signal V of voltage comparator circuit (6) to receiving ₁With analog voltage signal V ₀Carry out difference and relatively obtain voltage deviation signal V ₂After export to microprocessor (2);

The described voltage deviation signal V of microprocessor (2) to receiving ₂Behind A/D converter, digital filter on the sheet, convert digital voltage signal f to ₀Described then digital voltage signal f ₀Handle back outputting drive voltage signal f by pid control algorithm ₁Give D/A converter A channel (8);

The drive voltage signal f of D/A converter A channel (8) to receiving ₁Carry out exporting analog voltage signal V after the digital-to-analog conversion _A, described analog voltage signal V _AAct on the control SFS light source (1) through output driving current signal I behind the constant-current source circuit (7).

2, the control device of average wavelength of light source in broad spectrum according to claim 1 is characterized in that model of temperature compensation J ₀(T) establishment step is:

First step: the environment temperature T that is recorded by temperature sensor (5) is under-45 ℃～70 ℃ conditions, and the mean wavelength λ of SFS light source (1) is with the variation relation f (T) of environment temperature T, and being defined as first curved line relation is λ=f (T);

Second step: monitoring detector (3) is to 5% light signal output voltage signal V after I/V change-over circuit (4) conversion of SFS light source (1) output light ₁, the mean wavelength λ and the described voltage signal V of SFS light source (1) are then arranged ₁Variation relation J (T) with environment temperature T is defined as second curved line relation $J\left(T\right)=\frac{V_1}{\mathrm{\&lambda;}\left(T\right)};$

Third step: adopt the non-linear method that fits that the second curved line relation J (T) is fitted, obtain model of temperature compensation J ₀(T)=A+BT+CT ², wherein, A represents that first fits coefficient, and B represents that second fits coefficient, and C represents that the 3rd fits coefficient, and first fits coefficient A, second and fit coefficient B, the 3rd to fit the coefficient of coefficient C inequality;

The 4th step: according to model of temperature compensation J ₀(T)=A+BT+CT ²Calculate offset Δ V _Ref(T)=λ ₀J ₀(T)-V _λ, in the formula, λ ₀The mean wave long value of expression SFS light source (1) in the time of 20 ± 2 ℃, Δ V _Ref(T) expression is with the reference voltage value of environment temperature T variation, V ₂Be illustrated in mean wave long value λ ₀The time through the voltage of I/V change-over circuit (4) output.

3, the control device of average wavelength of light source in broad spectrum according to claim 1, it is characterized in that: microprocessor (2) is selected the C8051F060 chip for use, it is 5% monitoring detector that monitoring detector (3) is selected splitting ratio for use, binary channels D/A converter in the D/A change-over circuit adopts the DAC8532 chip, and temperature sensor (5) is selected single wire digital formula DS18B20 temperature sensor for use.

4, the control device of average wavelength of light source in broad spectrum according to claim 1 is characterized in that the connection of hardware circuit is:

The inverting input 6 of operational amplifier N2B connects with the light intensity current signal end of monitoring detector (3) output in the I/V change-over circuit (4); Resistance R 35 1 ends connect the inverting input 6 of operational amplifier N2B, and the other end connects the output terminal 7 of operational amplifier N2B, and resistance R 35 is the feedback resistance of operational amplifier N2B; Capacitor C 58 1 ends connect the inverting input 6 of operational amplifier N2B, and the other end connects the output terminal 7 of operational amplifier N2B; Resistance R 36 1 ends connect the input end 5 of operational amplifier, resistance R 36 other end analogue grounds; Capacitor C 59 1 ends connect the positive input 5 of operational amplifier, capacitor C 59 other end analogue grounds; The output terminal 7 of operational amplifier N2B connects after resistance R 39 with the inverting input 2 of operational amplifier N2A and connects; The analog control voltage signal end of B passage (9) output of D/A converter connects with resistance R 38 1 ends, the reverse input end 2 of operational amplifier N2A in resistance R 38 other ends and the voltage comparator circuit (6) connects, capacitor C 60 1 ends are connected on the analog control voltage signal end of B passage (9) output of D/A converter, capacitor C 60 another terminations simulation ground; The output terminal 1 of operational amplifier N2A connects with resistance R 40 1 ends, and resistance R 40 other ends connect with an end of resistance R 42, and the other end of resistance R 42 connects with capacitor C 61 1 ends, another termination simulation ground of capacitor C 61; One end of resistance R 37 connects the reverse input end 2 of operational amplifier N2A, and resistance R 37 other ends are connected between resistance R 40 and the resistance R 42, and wherein resistance R 37 is the feedback resistance of operational amplifier N2A; The positive pole of stabilivolt V3 connects simulation ground, and negative pole connects with an end of resistance R 40; Capacitor C 56 1 ends connect with the positive power source terminal 8 of operational amplifier N2A, another termination simulation ground; Capacitor C 57 1 ends connect with the negative power end 4 of operational amplifier N2A, another termination simulation ground; One end of resistance R 41 connects with the positive input 3 of operational amplifier N2A, another termination simulation ground of resistance R 41; The output terminal of operational amplifier N2A connects with the end of little process chip D2 18; The positive power source terminal 8 of operational amplifier N2A connects+the 5V power supply, and the negative power end 4 of operational amplifier N2A connects-the 5V power supply;

The digital voltage end D3.3 of the power end 3 of temperature sensor chip D5 and power-switching circuit V2 output connects, 1 termination digitally, data output end 2 connects with the end 29 of little process chip D2, is in series with resistance R 26 between data output end 2 and the power end 3;

The end 8 of binary channels D/A conversion chip D3 connects simulation ground, data input pin 7, input end of clock 6, Enable Pin 5 connect with end 41, end 40, the end 39 of microprocessor chip D2 respectively, D/A output terminal 4 connects with the end 2 of constant current source N5A after resistance R 51, D/A output terminal 3 connects with the reverse input end 2 of operational amplifier N2A after resistance R 38,2 terminations+2.5V voltage, and capacitor C 3, capacitor C 4 be connected in parallel on simulation and 2 ends between, 1 termination+5V voltage, and capacitor C 1, capacitor C 2 are connected in parallel between simulation ground and 1 end;

The input end 2 of voltage transitions chip N4 in the constant-current source circuit connects+the 5V power supply, 4 terminations simulation ground, output terminal 6 output+2.5V voltages are given the positive input 3 of operational amplifier N5A, the output terminal 1 of operational amplifier N5A connects with the reverse input end 6 of operational amplifier N5B after resistance R 54, the output terminal 7 of operational amplifier N5B connects with the base stage of triode V5, the collector of triode V5 connects simulation ground, the emitter of triode V5 connects with resistance R 58 1 ends, resistance R 58 other ends be connected in the SFS light source (1) LD pumping source (101) on, the end 4 of binary channels D/A conversion chip D3 is connected in the reverse input end 2 of operational amplifier N5A after resistance R 51; Capacitor C 62 1 end connection+5V power supplys, capacitor C 62 another termination simulation ground, the positive termination+2.5V of capacitor C 63, capacitor C 63 another termination simulation ground, capacitor C 64 1 terminations+2.5V, capacitor C 64 another termination simulation ground; Resistance R 52 1 ends connect with the inverting input 2 of operational amplifier N5A, and resistance R 52 other ends connect the output terminal 1 of operational amplifier N5B, and resistance R 52 is the feedback resistance of operational amplifier N5A; Resistance R 56 1 ends connect with the inverting input 6 of operational amplifier N5B, and the other end connects the emitter of triode V5, and resistance R 56 is the feedback resistance of operational amplifier N5B; The power end 8 of operational amplifier N5A connects+5V, 4 terminations simulation ground, capacitor C 65 1 end connection+5V power supplys, capacitor C 65 other ends connect simulation ground, resistance R 55 1 terminations+2.5V, the normal phase input end 5 of another termination operational amplifier N5B, the normal phase input end 5 of capacitor C 69 1 termination operational amplifier N5B, capacitor C 69 another termination simulation ground; Resistance R 50 1 ends are connected in the end 4 of binary channels D/A conversion chip D3, another termination simulation ground; Resistance R 53 1 ends connect the reverse input end 2 of operational amplifier N5A, resistance R 53 other ends connect the LD pumping source (101) in the SFS light source (1), capacitor C 67 1 ends connect the LD pumping source (101) in the SFS light source (1), other end connection+5V the power supply of capacitor C 67, positive termination+the 5V of capacitor C 68, the other end of capacitor C 68 connects the LD pumping source (101) in the SFS light source (1), capacitor C 66 positive termination+5V, another termination simulation ground of capacitor C 66;

Power-switching circuit general+5V is converted to+3.3V, the power end 2 connection+5V of power conversion chip V2,1 termination simulation ground, output terminal 3 connects an end of inductance L 3, the other end output digital voltage 3.3V of inductance L 3, output terminal 3 connects an end of inductance L 4, the other end output aanalogvoltage 3.3V of inductance L 4, the output terminal 3 of capacitor C 51 1 end joining power conversion chip V2, capacitor C 51 another termination simulation ground, the analog output voltage 3.3V of the anode joining power conversion chip V2 of capacitor C 52, another termination simulation ground of capacitor C 52;

The end 2 of microprocessor chip D2, end 6, end 21 connection+2.5V power supplys, end 3, end 7, end 8, end 10, end 12, end 14, end 15, end 17, end 19, end 20, end 23 connects simulation ground, end 5 connects digitally after capacitor C 42, end 11, end 13, end 16, end 24 meets the aanalogvoltage A3.3 of power-switching circuit output, capacitor C 53 1 termination end 24, capacitor C 53 another termination simulation ground, end 22 connects digitally after capacitor C 41, end 28 meets the digital voltage D3.3 of power-switching circuit output, end 37 meets the digital voltage D3.3 of power-switching circuit output, end 38 connects digitally, and hold 37 and end be connected with capacitor C 45 between 38, end 39, end 40, end 41 is respectively through resistance R 20, resistance R 21, connect after the resistance R 22+the 5V power supply, end 63 connects digitally, end 64 meets the digital voltage D3.3 of power-switching circuit output, and hold 63 and end be connected with capacitor C 44 between 64, end 89 connects digitally, end 90 meets the digital voltage D3.3 of power-switching circuit output, and hold 89 and end be connected with capacitor C 43 between 90, end 96, end 97, end 98, end 99 is as the external debug interface, and hold 97 and the digital voltage D3.3 of power-switching circuit output between be connected with resistance R 24, the end 100 respectively with resistance R 23, capacitor C 39 1 ends connect, capacitor C 39 another terminations digitally, resistance R 23 another termination+5V power supplys, capacitor C 40 are connected in+the 5V power supply and digitally between.

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