CN112462825B - Low-power-consumption high-stability laser temperature closed-loop control system and method - Google Patents
Low-power-consumption high-stability laser temperature closed-loop control system and method Download PDFInfo
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- CN112462825B CN112462825B CN202011292921.1A CN202011292921A CN112462825B CN 112462825 B CN112462825 B CN 112462825B CN 202011292921 A CN202011292921 A CN 202011292921A CN 112462825 B CN112462825 B CN 112462825B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
- G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01S5/00—Semiconductor lasers
- H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
- H01S5/18—Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities
- H01S5/183—Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities having only vertical cavities, e.g. vertical cavity surface-emitting lasers [VCSEL]
Abstract
The invention provides a low-power-consumption high-stability laser temperature closed-loop control system and a method, the system comprises a voice chip, an unbalanced bridge, an instrument amplifier and a power amplifier, the voice chip comprises a first DAC circuit, a double-channel ADC circuit, a second DAC circuit and a DSP (digital signal processor) core processor, the unbalanced bridge is respectively connected with a thermistor and the first DAC circuit, the instrument amplifier is connected with the unbalanced bridge, the double-channel ADC circuit is respectively connected with the first DAC circuit and the instrument amplifier, the DSP core processor calculates and obtains a temperature control voltage signal according to a bridge excitation signal and an amplified bridge output signal, the power amplifier is connected with the second DAC circuit, and the power amplifier is used for amplifying the temperature control voltage signal and exciting an electric heating sheet according to the amplified temperature control voltage signal. By applying the technical scheme of the invention, the technical problems that a laser temperature control system in the prior art has large temperature measurement drift and is not suitable for engineering application environments with low power consumption and low temperature drift are solved.
Description
Technical Field
The invention relates to the technical field of lasers, in particular to a low-power-consumption high-stability laser temperature closed-loop control system and method.
Background
The VCSEL laser is used for atom driving and signal detection of an atom magnetometer and an atom gyro, and the temperature stability of the VCSEL laser directly influences the stability of laser frequency, so that the stability of magnetic field measurement and closed-loop control of a sensor is influenced, and the improvement of the precision of the atom gyro and the magnetometer is restricted.
The alternating current temperature measuring method is characterized in that a single thermistor is used as a temperature sensitive element, and the amplitude change of alternating current voltage caused by the resistance change of the thermistor is differentially detected by using an unbalanced alternating current bridge, so that the temperature is measured; the alternating current heating is driven by a sinusoidal signal with adjustable amplitude. The traditional amplitude demodulation mode adopts a high-speed ADC chip to synchronously sample an electric bridge excitation signal and an output signal, and then realizes demodulation in a processor by using modes such as digital correlation operation and the like; the heating driving signal is a sinusoidal signal with amplitude variation directly generated by a high-speed DAC chip, and then secondary amplification is carried out by a power device, so that the VCSEL laser is heated. But the method has higher requirements on indexes such as the running speed of an ADC chip, a DAC chip and a processor, and has larger power consumption; and because the adopted discrete devices are all discrete devices, the temperature measurement drift of the system is large in high and low temperature environments, and the system is not suitable for engineering application environments with low power consumption and low temperature drift.
Disclosure of Invention
The invention provides a low-power-consumption high-stability laser temperature closed-loop control system and a method, which can solve the technical problems that a laser temperature control system in the prior art has large temperature measurement drift and is not suitable for engineering application environments with low power consumption and low temperature drift.
According to an aspect of the present invention, there is provided a low power consumption high stability laser temperature closed loop control system, including: the voice chip comprises a first DAC circuit, a double-channel ADC circuit, a second DAC circuit and a DSP (digital signal processor) core processor, wherein the first DAC circuit, the double-channel ADC circuit and the second DAC circuit are respectively connected with the DSP core processor, and the first DAC circuit is used for generating a bridge excitation signal; the unbalanced bridge is respectively connected with the thermistor and the first DAC circuit, the thermistor is pasted on the laser, and the unbalanced bridge is used for generating a bridge output signal according to a bridge excitation signal and the resistance value of the thermistor; the instrument amplifier is connected with the unbalanced bridge and used for amplifying bridge output signals of the unbalanced bridge, the double-channel ADC circuit is respectively connected with the first DAC circuit and the instrument amplifier and used for outputting bridge excitation signals and amplified bridge output signals to the DSP core processor, and the DSP core processor completes autocorrelation operation and cross correlation operation according to the bridge excitation signals and the amplified bridge output signals to obtain the temperature of the laser and calculates and obtains temperature control voltage signals according to the temperature of the laser; and the power amplifier is connected with the second DAC circuit, the second DAC circuit is used for outputting the temperature control voltage signal to the power amplifier, and the power amplifier is used for amplifying the temperature control voltage signal and exciting the electric heating plate according to the amplified temperature control voltage signal so as to realize the temperature closed-loop control of the laser.
Further, the temperature of the laser may be based on
To obtain the resistance value R of the thermistor according to
To obtain wherein R0Bridge arm resistance of unbalanced bridge, R1Adjusting the resistance, P, for the amplification of the instrumentation amplifierout1"is the result of the filtered and simplified cross-correlation operation, Pout2"is the result of the filtered and simplified autocorrelation operation.
Further, a DSP core processor
Performing a cross-correlation calculation between the amplified bridge output signal and the bridge excitation signal, wherein VO′UTFor amplified bridge output signal, VINIs the bridge excitation signal, A is the amplitude of the bridge excitation signal, B is the amplitude of the amplified bridge output signal, ωcFor the frequency, theta, of the amplified bridge output signal and bridge excitation signal1Is the phase, θ, of the bridge excitation signal2For the phase of the amplified bridge output signal, Pout1Is the result of the cross-correlation operation.
Further, a DSP core processor
Performing autocorrelation calculation on the bridge excitation signal, wherein Pout2Is the result of the cross-correlation operation.
Further, the DSP core processor is according to VHEAT＝u(k)·VDACOutput temperature control voltage signal VHEAT，
Wherein, VDACIs the standard signal, k, output by the second DAC circuitpIs a proportionality coefficient, kiIs an integral coefficient, kdIs a differential coefficient, k is the current time, k-1 is the previous time, e (k) is the current timeTemperature T and expected value T of lasersetThe difference between e (k-1) and the last time laser temperature T and the expected value TsetThe difference between them.
Furthermore, the laser temperature closed-loop control system further comprises a first second-order low-pass filter and a first second-order high-pass filter, the first DAC circuit, the first second-order low-pass filter, the first second-order high-pass filter and the unbalanced bridge are sequentially connected, the first second-order low-pass filter is used for performing low-pass filtering on a bridge excitation signal output by the first DAC circuit, and the first second-order high-pass filter is used for performing high-pass filtering on the bridge excitation signal subjected to low-pass filtering.
Furthermore, the laser temperature closed-loop control system also comprises an impedance matching circuit, the impedance matching circuit is respectively connected with the instrument amplifier and the double-channel ADC circuit, and the impedance matching circuit is used for improving the impedance matching performance between the amplified bridge output signal and the control circuit of the voice chip.
Furthermore, the laser temperature closed-loop control system further comprises a second-order low-pass filter, the second-order low-pass filter is respectively connected with the impedance matching circuit and the dual-channel ADC circuit, and the second-order low-pass filter is used for performing low-pass filtering on the amplified bridge output signal and the bridge excitation signal.
Furthermore, the laser temperature closed-loop control system further comprises a third second-order low-pass filter and a second-order high-pass filter, the second DAC circuit, the third second-order low-pass filter, the second-order high-pass filter and the power amplifier are sequentially connected, the third second-order low-pass filter is used for performing low-pass filtering on the temperature control voltage signal, and the second-order high-pass filter is used for performing high-pass filtering on the temperature control voltage signal after the low-pass filtering.
According to another aspect of the present invention, there is provided a low power consumption high stability laser temperature closed loop control method, the low power consumption high stability laser temperature closed loop control method using the low power consumption high stability laser temperature closed loop control system as described above for temperature closed loop control, the laser temperature closed loop control method comprising: generating a bridge excitation signal by a first DAC circuit of the voice chip; the unbalanced bridge generates a bridge output signal according to the bridge excitation signal and the resistance value of the thermistor; the instrument amplifier amplifies the output signal of the electric bridge; the two-channel ADC circuit of the voice chip outputs the bridge excitation signal and the amplified bridge output signal to a DSP core processor of the voice chip; the DSP core processor completes self-correlation operation and cross-correlation operation according to the bridge excitation signal and the amplified bridge output signal to obtain the temperature of the laser and calculates and obtains a temperature control voltage signal according to the temperature of the laser; the second DAC circuit of the voice chip outputs the temperature control voltage signal to the power amplifier; the power amplifier is used for amplifying the temperature control voltage signal and exciting the electric heating plate according to the amplified temperature control voltage signal so as to realize the temperature closed-loop control of the laser.
The technical scheme of the invention provides a low-power-consumption high-stability laser temperature closed-loop control system, which adopts a temperature demodulation method and heating driving signal control based on a low-power-consumption integrated circuit such as a voice chip and the like to replace the traditional temperature demodulation method and heating driving signal control based on high-speed ADC, high-speed DAC, FPGA and other high-power discrete devices, reduces temperature measurement drift and system power consumption on the basis of ensuring the stability of temperature control, further improves the environmental adaptability of the system, and meets the engineering application requirements of an atomic magnetometer and an atomic gyroscope.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a block diagram illustrating a structure of a low-power consumption high-stability laser temperature closed-loop control system according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating a schematic diagram of a low-power consumption high-stability laser temperature closed-loop control method according to an embodiment of the present invention.
Wherein the figures include the following reference numerals:
10. a voice chip; 11. a first DAC circuit; 12. a dual channel ADC circuit; 13. a second DAC circuit; 14. a DSP core processor; 20. an unbalanced bridge; 30. an instrumentation amplifier; 40. a power amplifier; 50. a first second order low pass filter; 60. a first second order high pass filter; 70. an impedance matching circuit; 80. a second order low pass filter; 90. a third second order low pass filter; 100. a second order high pass filter.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
As shown in fig. 1 and fig. 2, according to an embodiment of the present invention, a low power consumption high stability laser temperature closed loop control system is provided, the low power consumption high stability laser temperature closed loop control system includes a voice chip 10, an unbalanced bridge 20, an instrumentation amplifier 30 and a power amplifier 40, the voice chip 10 includes a first DAC circuit 11, a dual channel ADC circuit 12, a second DAC circuit 13 and a DSP core processor 14, the first DAC circuit 11, the dual channel ADC circuit 12 and the second DAC circuit 13 are respectively connected with the DSP core processor 14, the first DAC circuit 11 is used for generating a bridge excitation signal, the unbalanced bridge 20 is respectively connected with a thermistor and the first DAC circuit 11, the thermistor is attached to the laser, the unbalanced bridge 20 is used for generating a bridge output signal according to the bridge excitation signal and a resistance value of the thermistor, the instrumentation amplifier 30 is connected with the unbalanced bridge 20, the instrumentation amplifier 30 is used for amplifying a bridge output signal of the unbalanced bridge 20, the dual-channel ADC circuit 12 is respectively connected to the first DAC circuit 11 and the instrumentation amplifier 30, the dual-channel ADC circuit 12 is used for outputting a bridge excitation signal and the amplified bridge output signal to the DSP core processor 14, the DSP core processor 14 completes auto-correlation operation and cross-correlation operation according to the bridge excitation signal and the amplified bridge output signal to obtain a temperature of the laser and calculates and obtains a temperature control voltage signal according to the temperature of the laser, the power amplifier 40 is connected to the second DAC circuit 13, the second DAC circuit 13 is used for outputting a temperature control voltage signal to the power amplifier 40, and the power amplifier 40 is used for amplifying the temperature control voltage signal and exciting the electrical heating sheet according to the amplified temperature control voltage signal to realize temperature closed-loop control of the laser.
The temperature closed-loop control system adopts a temperature demodulation method and heating driving signal control based on a low-power-consumption integrated circuit such as a voice chip and the like, replaces the traditional temperature demodulation method and heating driving signal control based on high-power discrete devices such as a high-speed ADC, a high-speed DAC and an FPGA and reduces temperature measurement drift and system power consumption on the basis of ensuring the temperature control stability, thereby improving the environmental adaptability of the system and meeting the engineering application requirements of an atomic magnetometer and an atomic gyroscope.
In the invention, the thermistor is pasted on the laser, the resistance value of the thermistor is closely related to the temperature, the change of the resistance value can cause the change of the output amplitude of the unbalanced alternating current bridge, and the temperature demodulation can be realized by measuring the amplitude. Specifically, in order to realize the closed-loop control of the laser temperature, a path of sinusoidal bridge excitation signal is generated by a 24-bit first DAC circuit 11 (i.e., a DA conversion circuit, a digital-to-analog conversion circuit) integrated in the voice chip 10; then, a double-channel 24-bit ADC chip circuit 12 (namely an AD conversion circuit) integrated in the voice chip 10 simultaneously acquires the excitation signal and the bridge output signal, directly calculates a voltage signal representing the output amplitude of the bridge in a DSP core processor 14 of the voice chip, and calculates a temperature value; then PID operation is carried out in the DSP core processor 14, and a second DAC circuit 13 integrated in the other path of the voice chip 10 is driven to generate a heating driving signal with variable amplitude; finally, the laser is amplified for the second stage by a power amplifier 40, and the heating sheet is driven to realize the temperature control of the laser.
Further, in the present invention, in order to improve the signal-to-noise ratio of the signal, the bridge excitation signal output by the first DAC circuit may be filtered. Specifically, in the present invention, the laser temperature closed-loop control system further includes a first second-order low-pass filter 50 and a first second-order high-pass filter 60, the first DAC circuit 11, the first second-order low-pass filter 50, the first second-order high-pass filter 60, and the unbalanced bridge 20 are connected in sequence, the first second-order low-pass filter 50 is configured to perform low-pass filtering on the bridge excitation signal output by the first DAC circuit 11, and the first second-order high-pass filter 60 is configured to perform high-pass filtering on the bridge excitation signal after the low-pass filtering.
In addition, in order to further improve the signal quality, the laser temperature closed-loop control system may be configured to further include an impedance matching circuit 70, the impedance matching circuit 70 is respectively connected to the instrumentation amplifier 30 and the dual-channel ADC circuit 12, and the impedance matching circuit 70 is configured to improve the impedance matching performance between the amplified bridge output signal and the control circuit of the voice chip 10.
By applying the configuration mode, the impedance matching circuit is configured in the laser temperature closed-loop control system, has the characteristics of high input impedance and low output impedance, can isolate the influence between the front stage and the rear stage, reduces the loss of the output signal of the instrumentation amplifier on a lead during long-distance transmission, improves the impedance matching performance between the output of the instrumentation amplifier and the voice chip control circuit, and improves the signal quality.
Further, in order to improve the signal-to-noise ratio of the signal, the laser temperature closed-loop control system may be configured to further include a second-order low-pass filter 80, where the second-order low-pass filter 80 is connected to the impedance matching circuit 70 and the dual-channel ADC circuit 12, respectively, and the second-order low-pass filter 80 is configured to perform low-pass filtering on the amplified bridge output signal and the bridge excitation signal.
In addition, in the present invention, in order to improve the signal-to-noise ratio of the temperature control voltage signal, the laser temperature closed-loop control system may be configured to further include a third second-order low-pass filter 90 and a second-order high-pass filter 100, the second DAC circuit 13, the third second-order low-pass filter 90, the second-order high-pass filter 100, and the power amplifier 40 are sequentially connected, the third second-order low-pass filter 90 is configured to perform low-pass filtering on the temperature control voltage signal, and the second-order high-pass filter 100 is configured to perform high-pass filtering on the temperature control voltage signal after low-pass filtering.
According to another aspect of the present invention, there is provided a low power consumption high stability laser temperature closed loop control method, which performs temperature closed loop control using the low power consumption high stability laser temperature closed loop control system as described above, the laser temperature closed loop control method including: generating a bridge excitation signal by a first DAC circuit 11 of the voice chip 10; the unbalanced bridge 20 generates a bridge output signal according to the bridge excitation signal and the resistance value of the thermistor; the instrumentation amplifier 30 amplifies the bridge output signal; the two-channel ADC circuit 12 of the voice chip 10 outputs the bridge excitation signal and the amplified bridge output signal to the DSP core processor 14 of the voice chip 10; the DSP core processor 14 completes autocorrelation operation and cross correlation operation according to the bridge excitation signal and the amplified bridge output signal to obtain the temperature of the laser and calculates and obtains a temperature control voltage signal according to the temperature of the laser; the second DAC circuit 13 of the voice chip 10 outputs the temperature control voltage signal to the power amplifier 40; the power amplifier 40 is used for amplifying the temperature control voltage signal and exciting the electric heating plate according to the amplified temperature control voltage signal to realize the temperature closed-loop control of the laser.
By applying the configuration mode, the temperature closed-loop control method of the low-power-consumption high-stability laser is provided, the temperature closed-loop control method of the low-power-consumption high-stability laser uses the temperature closed-loop control system of the low-power-consumption high-stability laser to carry out temperature closed-loop control, the temperature closed-loop control method adopts a temperature demodulation method and heating driving signal control based on a low-power-consumption integrated circuit such as a voice chip and the like to replace the traditional temperature demodulation method and heating driving signal control based on high-power discrete devices such as a high-speed ADC, a high-speed DAC and an FPGA, temperature measurement drift is reduced on the basis of ensuring temperature control stability, system power consumption is reduced, the environmental adaptability of the system is further improved, and the engineering application requirements of an atomic magnetometer and an atomic gyroscope are met.
Further, in order to improve the signal-to-noise ratio of signal transmission and improve the signal quality, after the first DAC circuit 11 generates the bridge excitation signal, the bridge excitation signal is filtered by the first second-order low-pass filter 50 and the first second-order high-pass filter 60, and then enters the unbalanced bridge 20 and the impedance matching circuit 70, the instrumentation amplifier 30 outputs the amplified bridge output signal to the impedance matching circuit 70 to improve the impedance matching performance between the instrumentation amplifier output and the voice chip control circuit, and improve the signal quality. The signal output by the impedance matching circuit 70 enters the dual-channel ADC circuit 12 after being filtered by the second-order low-pass filter 80, the dual-channel ADC circuit 12 outputs the bridge excitation signal and the amplified bridge output signal to the DSP core processor 14 of the voice chip 10, and the DSP core processor 14 completes autocorrelation operation and cross correlation operation according to the bridge excitation signal and the amplified bridge output signal to obtain the temperature of the laser and calculate the temperature control voltage signal according to the temperature of the laser; the second DAC circuit 13 of the voice chip 10 outputs the temperature control voltage signal to the power amplifier 40 after being filtered by the third second-order low-pass filter 90 and the second-order high-pass filter 100.
For further understanding of the present invention, the following describes the low power consumption high stability laser temperature closed loop control system and method provided by the present invention with reference to fig. 1 and 2.
As shown in fig. 1 and fig. 2, according to an embodiment of the present invention, a low power consumption high stability laser temperature closed loop control system is provided, the system includes a voice chip 10, an unbalanced bridge 20, an instrumentation amplifier 30, a power amplifier 40, a first second-order low pass filter 50, a first second-order high pass filter 60, an impedance matching circuit 70, a second-order low pass filter 80, a third second-order low pass filter 90, and a second-order high pass filter 100, the voice chip 10 includes a first DAC circuit 11, a dual-channel ADC circuit 12, a second DAC circuit 13, and a DSP core processor 14, the first DAC circuit 11, the dual-channel ADC circuit 12, and the second DAC circuit 13 are respectively connected to the DSP core processor 14, the first DAC circuit 11 is used for generating a bridge excitation signal, the first DAC circuit 11, the first second-order low pass filter 50, the first second-order high pass filter 60, and the unbalanced bridge 20 are sequentially connected, the instrumentation amplifier 30 is respectively connected with the unbalanced bridge 20 and the impedance matching circuit 70, the impedance matching circuit 70 is connected with the dual-channel ADC circuit 12 after passing through the second-order low-pass filter 80, and the second DAC circuit 13, the third second-order low-pass filter 90, the second-order high-pass filter 100 and the power amplifier 40 are sequentially connected. In order to realize the closed-loop control of the laser temperature, the temperature closed-loop control system provided by the present invention needs to be used for laser temperature adjustment, and the specific flow of the closed-loop control of the temperature is specifically described below with reference to fig. 2.
Step one, a 24-bit first DAC circuit 11 integrated in the voice chip 10 generates a bridge excitation signal with a signal frequency of 7.3kHz, and the bridge excitation signal is filtered by a first second-order low-pass filter 50 and a first second-order high-pass filter 60 to excite an unbalanced bridge 20, so that the output V of the unbalanced bridge 20 is outputOUTCan be represented by the following formula:
wherein, VINIs the bridge excitation signal, R is the resistance of the thermistor, R0Resistance of the arm resistance of the unbalanced bridge 20, and bridge output V of the unbalanced bridge 20OUTAnd bridge excitation VINAnd the frequency is the same.
And step two, amplifying the bridge output signal of the unbalanced bridge 20 by using the instrumentation amplifier 30 so as to improve the resolution of temperature measurement.
Bridge output V of instrumentation amplifier 30o′utCan be represented by the following formula:
wherein R is1Is an instrument amplifier 30 amplification factor adjusting resistor with the amplification factor of
Step three, synchronously acquiring an amplified bridge output signal V 'by using a double-channel 24-bit ADC chip circuit 12 (aiming at converting an analog signal into a digital signal) integrated in the voice chip 10'out(i.e., the output of instrumentation amplifier 30) and bridge excitation signal VINAnd is divided intoAnd performing autocorrelation operation and cross-correlation operation in a DSP core processor.
DSP core processor 14
(equation one) performing cross-correlation calculation between the amplified bridge output signal and the bridge excitation signal, wherein V'OUTFor amplified bridge output signal, VINIs the bridge excitation signal, A is the amplitude of the bridge excitation signal, B is the amplitude of the amplified bridge output signal, ωcFor the frequency, theta, of the amplified bridge output signal and bridge excitation signal1Is the phase, θ, of the bridge excitation signal2For the phase of the amplified bridge output signal, Pout1Is the result of the cross-correlation operation.
DSP core processor 14
(formula II) performing autocorrelation calculation on the bridge excitation signal, wherein Pout2Is the result of the cross-correlation operation.
Filtering out high frequency components in the first formula and the second formula output results by a digital low pass filter in the DSP core processor 14 to obtain an operation result Pout1′、Pout2' may become:
wherein, due to VINAnd V'OUTThe phase difference between the two signals is small, theta1≈θ2Then, equation three and equation four can be expressed as:
v 'can be obtained according to the formula I to the formula IV'OUTCan be made of VINAmplitude a represents:
then there are:
resistor R is adjusted due to the amplification factor of instrumentation amplifier 301And the arm resistance R of the unbalanced bridge 200The isoparameters are all set values, so that the result P of the cross-correlation operation after filtering and simplification is only needed to be solvedout1"and the result P of the filtered and simplified autocorrelation operationout2"the ratio of the resistance value R to the resistance value R of the thermistor, the calculation formula and the excitation signal VINIs independent of the amplitude of the signal, the temperature resolving drift and fluctuation caused by the change of the signal amplitude are reduced.
And step four, utilizing the resistance value of the thermistor to further solve the temperature of the VCSEL laser. In this embodiment, the sensor used in the temperature closed-loop control system is an NTC thermistor, and the conversion formula of the resistance R and the temperature T can be expressed as:
and comparing the temperature information of the VCSEL laser calculated in the formula nine with an expected value, introducing the difference into a digital PID closed-loop control algorithm to obtain the temperature variation, and changing the amplitude of the heating driving signal, thereby realizing the temperature closed-loop control of the VCSEL laser.
Specifically, T in the formula nine is compared with the expected value TsetAnd subtracting to obtain a difference value e (t) between the expected temperature and the actual temperature, and controlling the amplitude of the voltage signal output by the second DAC circuit 13 integrated in the other path of the voice chip 10 through a PID controller in the DSP core processor 14.
The output expression of the PID controller is as follows:
wherein k ispIs a proportionality coefficient, kiIs an integral coefficient, kdIs a differential coefficient, k is the current time, k-1 is the previous time, e (k) is the laser temperature T and the expected value T at the current timesetThe difference between e (k-1) and the last time laser temperature T and the expected value TsetThe difference between them.
Output signal V of the second DAC circuit 13HEATCan be expressed as:
VHEAT＝u(k)·VDAC(formula eleven)
Wherein, VDACIs the standard signal output by the second DAC circuit.
The signal output by the second DAC circuit is then two-stage amplified by a power amplifier 40 to provide heating power.
V′HEAT＝k·VHEAT(formula twelve)
Wherein k is the amplification factor of the power amplifier.
And adjusting PID parameters, controlling the amplitude of an electric heating driving signal, exciting an electric heating sheet, and controlling the difference e (t) between the expected temperature and the actual temperature to be zero to realize the temperature closed-loop control of the VCSEL laser.
In summary, the present invention provides a low power consumption high stability laser temperature closed-loop control system and method, which realize low power consumption high stability temperature closed-loop control of VCSEL laser, and are suitable for VCSEL laser temperature closed-loop control of atomic magnetometer and atomic gyroscope. Compared with the traditional temperature demodulation method and heating driving signal control method based on high-power devices such as a high-speed ADC (analog-to-digital converter), a high-speed DAC (digital-to-analog converter) and an FPGA (field programmable gate array), the temperature closed-loop control system and method based on the low-power integrated circuit such as the voice chip and the like greatly reduce the power consumption and temperature drift of the system on the basis of ensuring the temperature control stability of the VCSEL laser, further improve the environmental adaptability of the system and meet the engineering application requirements.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The temperature closed-loop control system of the low-power-consumption high-stability laser is characterized by comprising:
a voice chip (10), wherein the voice chip (10) comprises a first DAC circuit (11), a two-channel ADC circuit (12), a second DAC circuit (13) and a DSP core processor (14), the first DAC circuit (11), the two-channel ADC circuit (12) and the second DAC circuit (13) are respectively connected with the DSP core processor (14), and the first DAC circuit (11) is used for generating a bridge excitation signal;
the unbalanced bridge (20), the said unbalanced bridge (20) is connected with thermistor and said first DAC circuit (11) respectively, the said thermistor is pasted on laser, the said unbalanced bridge (20) is used for stimulating the signal and generating the bridge output signal according to the resistance value of the thermistor of the signal of said bridge;
the instrumentation amplifier (30) is connected with the unbalanced bridge (20), the instrumentation amplifier (30) is used for amplifying a bridge output signal of the unbalanced bridge (20), the dual-channel ADC circuit (12) is respectively connected with the first DAC circuit (11) and the instrumentation amplifier (30), the dual-channel ADC circuit (12) is used for outputting the bridge excitation signal and the amplified bridge output signal to the DSP core processor (14), and the DSP core processor (14) completes self-correlation operation and cross-correlation operation according to the bridge excitation signal and the amplified bridge output signal to obtain the temperature of the laser and calculates and obtains a temperature control voltage signal according to the temperature of the laser;
a power amplifier (40), the power amplifier (40) being connected to the second DAC circuit (13), the second DAC circuit (13) being configured to output the temperature control voltage signal to the power amplifier (40), the power amplifier (40) being configured to amplify the temperature control voltage signal and to energize an electrical heater chip in accordance with the amplified temperature control voltage signal to achieve closed loop control of the temperature of the laser;
the temperature of the laser can be determined
Can be obtained, the resistance value R of the thermistor can be obtained according to
To obtain wherein R0Is the leg resistance, R, of the unbalanced bridge (20)1Adjusting the resistance, P, for the amplification of the instrumentation amplifier (30)out1"is the result of the filtered and simplified cross-correlation operation, Pout2"is the result of the filtered and simplified autocorrelation operation.
2. The low-power consumption high-stability laser temperature closed-loop control system according to claim 1, wherein the DSP core processor (14) is based on
Performing a cross-correlation calculation between the amplified bridge output signal and the bridge excitation signal, wherein V'OUTFor the amplified output signal of the bridge, VINIs the bridge excitation signal, A is the amplitude of the bridge excitation signal, B is the amplitude of the amplified bridge output signal, ωcFor the amplified frequencies of the bridge output signal and the bridge excitation signal, θ1Is the phase, θ, of the bridge excitation signal2For the phase of the amplified output signal of the bridge, Pout1T is the time, which is the result of the cross-correlation operation.
3. The low-power consumption high-stability laser temperature closed-loop control system according to claim 2, wherein the DSP core processor (14) is based on
Performing an autocorrelation calculation on the bridge excitation signal, wherein Pout2Is the result of the autocorrelation operation.
4. The low power consumption high stability laser of claim 3Closed loop control system for temperature of a device, characterized in that the DSP core processor (14) is based on VHEAT＝u(k)·VDACOutput temperature control voltage signal VHEAT，
Wherein, VDACIs the standard signal, k, output by the second DAC circuitpIs a proportionality coefficient, kiIs an integral coefficient, kdIs a differential coefficient, k is the current time, k-1 is the previous time, e (k) is the laser temperature T and the expected value T at the current timesetThe difference between e (k-1) and the last time laser temperature T and the expected value TsetThe difference between them.
5. The low power consumption high stability laser temperature closed loop control system according to any one of claims 1 to 4, further comprising a first second order low pass filter (50) and a first second order high pass filter (60), wherein the first DAC circuit (11), the first second order low pass filter (50), the first second order high pass filter (60) and the unbalanced bridge (20) are connected in sequence, the first second order low pass filter (50) is used for low pass filtering the bridge excitation signal output by the first DAC circuit (11), and the first second order high pass filter (60) is used for high pass filtering the low pass filtered bridge excitation signal.
6. The low-power-consumption high-stability laser temperature closed-loop control system according to claim 5, further comprising an impedance matching circuit (70), wherein the impedance matching circuit (70) is respectively connected with the instrumentation amplifier (30) and the dual-channel ADC circuit (12), and the impedance matching circuit (70) is configured to improve impedance matching performance between the amplified bridge output signal and a control circuit of the voice chip (10); the impedance matching circuit (70) is further connected to the first second order high pass filter (60).
7. The low-power consumption high-stability laser temperature closed-loop control system according to claim 6, further comprising a second-order low-pass filter (80), wherein the second-order low-pass filter (80) is respectively connected to the impedance matching circuit (70) and the dual-channel ADC circuit (12), and the second-order low-pass filter (80) is used for low-pass filtering the amplified bridge output signal and the bridge excitation signal.
8. The low-power-consumption high-stability laser temperature closed-loop control system according to claim 7, further comprising a third second-order low-pass filter (90) and a second-order high-pass filter (100), wherein the second DAC circuit (13), the third second-order low-pass filter (90), the second-order high-pass filter (100) and the power amplifier (40) are sequentially connected, the third second-order low-pass filter (90) is used for low-pass filtering the temperature control voltage signal, and the second-order high-pass filter (100) is used for high-pass filtering the low-pass filtered temperature control voltage signal.
9. A low-power consumption high-stability laser temperature closed-loop control method, wherein the low-power consumption high-stability laser temperature closed-loop control method uses the low-power consumption high-stability laser temperature closed-loop control system according to any one of claims 1 to 8 for temperature closed-loop control, and the laser temperature closed-loop control method comprises:
generating a bridge excitation signal by a first DAC circuit (11) of a voice chip (10);
the unbalanced bridge (20) generates a bridge output signal according to the bridge excitation signal and the resistance value of the thermistor;
an instrumentation amplifier (30) amplifies the bridge output signal;
a double-channel ADC circuit (12) of the voice chip (10) outputs the bridge excitation signal and the amplified bridge output signal to a DSP (digital signal processor) core processor (14) of the voice chip (10);
the DSP core processor (14) completes autocorrelation operation and cross correlation operation according to the bridge excitation signal and the amplified bridge output signal to acquire the temperature of the laser and calculates and acquires a temperature control voltage signal according to the temperature of the laser;
the second DAC circuit (13) of the voice chip (10) outputs the temperature control voltage signal to a power amplifier (40);
the power amplifier (40) is used for amplifying the temperature control voltage signal and exciting the electric heating plate according to the amplified temperature control voltage signal so as to realize the temperature closed-loop control of the laser.
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