CN101149265A - Micro optical peg-top modulation/demodulation and feedback control device - Google Patents
Micro optical peg-top modulation/demodulation and feedback control device Download PDFInfo
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- CN101149265A CN101149265A CNA200710177376XA CN200710177376A CN101149265A CN 101149265 A CN101149265 A CN 101149265A CN A200710177376X A CNA200710177376X A CN A200710177376XA CN 200710177376 A CN200710177376 A CN 200710177376A CN 101149265 A CN101149265 A CN 101149265A
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Abstract
The invention discloses a modulation-demodulation and feedback-controlled device for the micro optical gyro. It is composed of the electrical source unit, the digital signal processor, the signal collection unit A, the signal collection unit B, the triangle generator, the closed loop feedback unit, the frequency controlling unit and temperature controlling unit. The invention uses the double frequency modulation-demodulation and the frequency controlled voltage based on the triangular wave while the temperature feeds back and the controlling mode of heads-and-feet double circuit closed loop detection. The technology makes the beam resonant frequency difference transformed by head-and feet in resonant hollow generated by the carrier angular velocity converse to voltage difference which is easy to detect, so it can measure the angular velocity indirectly by the conversion.
Description
Technical Field
The invention belongs to the technical field of optical gyroscopes, in particular to a modulation-demodulation technology and detection control of a micro-optical gyroscope based on a ring resonant cavity. The modulation and demodulation technology converts the resonant frequency difference of the light beam which propagates clockwise and anticlockwise in the resonant cavity caused by the angular velocity of the carrier into the voltage difference which is easy to measure, and the angular velocity of the carrier is indirectly measured through the conversion.
Background
The resonance type optical gyroscope reflects the frequency difference of two beams of light which propagate clockwise and anticlockwise, and the frequency difference and the rotation angular velocity have the following relationship:wherein A is the closed area of the ring resonator, λ is the wavelength of the light propagating in the resonator at rest, L is the wavelength of the ring resonator, and Ω is the angular velocity of the carrier. The angular velocity of the carrier can be calculated by detecting the frequency difference. It seems not easy to directly measure the frequency difference between the two beams, and the detection accuracy is not too high, so a modulation and demodulation technique is needed to convert the frequency difference into another physical quantity which is easy to measure.
At present, a resonant micro-optical gyroscope is mostly modulated by a dual-frequency sawtooth wave. For a micro-optical gyroscope with an extremely short sensitive ring length, the frequency difference generated by a modulation signal is very high, and if a sawtooth wave simulation mode is adopted, the flyback time of a sawtooth wave seriously influences the modulation effect; if a digital sawtooth wave mode is adopted, the high-frequency digital signal has obvious step effect and can also influence the modulation effect. In order to overcome the defects, the inventor provides a modulation mode based on triangular waves, and the modulation mode has the advantages of large modulation frequency difference, large dynamic range, high precision, good modulation effect and the like. Meanwhile, the stability of closed-loop locking is improved by adopting double-path feedback control, and the influence of environmental noise is not easy to influence.
Disclosure of Invention
The invention aims to provide a modulation-demodulation and detection control device of a micro-optical gyroscope based on a ring resonant cavity, which adopts a dual-frequency modulation-demodulation method based on triangular waves to convert frequency difference signals into voltage difference signals, is easy to realize detection, and can change modulation frequency according to the resonance characteristics of the resonant cavity so as to obtain the maximum detection range or the maximum detection precision. By adopting the detection control method, closed-loop feedback control is realized according to the clockwise light path output signal, the light source emergent light frequency is always locked at the resonant frequency point of the clockwise light path, the output of the gyroscope avoids the influence of factors except the angular velocity of a carrier, and the gyroscope works in the approximate linear range of the light path output by modulating the signal, so that the gyroscope has high detection precision, large dynamic range and good scale factor linearity.
The invention relates to a modulation-demodulation and feedback control device of a micro-optical gyroscope, which consists of a power circuit unit, a digital signal processor, a signal acquisition unit A, a signal acquisition unit B, a triangular wave signal generator, a closed loop feedback unit, a frequency control unit and a temperature control unit.
The signal acquisition unit A acquires a clockwise light path signal f output by the first detector CW-0 After being amplified by the first preamplifier, the digital signal f is converted and output by the A/D converter CW-1 To the digital signal processor;
the signal acquisition unit B acquires the acquired anticlockwise light path signal f output by the second detector CCW-0 After being amplified by the second preamplifier, the digital signal f is converted and output by the analog-to-digital converter B CCW-1 To the digital signal processor;
digital signal processor for receiving digital signal f CW-1 Demodulating and outputting A-path frequency compensation signal f CW-2 For the frequency control unit, the frequency control unit compensates the received A-path frequency compensation signal f CW-2 The voltage signal f is output after passing through a digital-to-analog converter A and a voltage conversion circuit CW-3 A light source;
digital signal processor for receiving digital signal f CCW-1 Demodulating and outputting B-path frequency compensation signal f CCW-2 For closed loop reactionA feedback unit, a closed loop feedback unit for compensating the received B-path frequency signal f CCW-2 Outputs a ramp signal f after passing through a digital-to-analog converter B and an analog amplifier CCW-3 Providing a second phase frequency shifter;
the digital signal processor generates a synchronous clock signal f for system operation FB Sending to a triangular wave signal generator as a triangular wave signal generator to generate a triangular wave modulation signal f SJ With reference to the phase of the generated triangular wave modulation signal f SJ Respectively providing a first phase frequency shifter and a second phase frequency shifter;
the analog-to-digital converter C of the temperature control unit first reads a voltage signal f representing the actual temperature of the light source 0 (simply called actual temperature voltage f) 0 ) And converting it into digital actual temperature voltage signal f D0 (digital temperature voltage f for short) D0 ) Outputting to a digital signal processor; the digital temperature voltage f D0 In a digital signal processor, a contrast signal f is output after adjustment D1 To a digital-to-analog converter C, the comparison signal f D1 After being converted by the D/A converter C, the voltage signal f representing the set temperature is output 1 To the light source.
The invention is based on the dual-frequency modulation technology of the triangular wave, according to the resonance characteristic of the resonant cavity, and through the calculation of the detection range and the detection precision, the waveform parameters of the modulated triangular wave are obtained: frequency and amplitude. A modulating electrode embodied by circuitry and fed to the integrated optical modulator modulates light to be input to the resonant cavity.
The detection control circuit of the invention adopts a temperature scanning mode to enable the light source frequency to reach the resonant frequency of a clockwise light path in the resonant cavity, and then realizes the locking of the clockwise light path through the double-path feedback of the temperature and the PZT voltage, namely, the light source frequency is always at the resonant frequency of the clockwise light path, and the corresponding detector outputs a direct current voltage signal.
The advantages of the modulation and demodulation technology and the detection control circuit of the invention are as follows: (1) The triangular wave with continuously changing amplitude is used as a modulation signal, so that frequent resetting of the modulation signal is avoided, and the modulation effect is improved; (2) Compared with the dual-frequency sawtooth wave, the triangular wave modulation signal can obtain the same modulation frequency difference at the lowest frequency; (3) By analyzing the resonance characteristics of the resonant cavity, the modulation frequency difference required by the maximum corresponding detection range and the highest detection precision can be obtained; (4) The working is in an approximate linear range, and the linearity of the scale factor is good; (5) The problems of small PZT adjusting range and low temperature adjusting precision are solved by adopting double-path feedback control of light source temperature and PZT; (6) The control of the light source emergent light frequency is adopted, so that the light frequency is always at the resonance frequency point of the clockwise light path, the influence of the external environment is small, and the stability and the anti-interference capability are higher.
Drawings
Fig. 1 is a block diagram of the present invention.
Fig. 1A is a schematic diagram of dual frequency modulation based on triangular waves according to the present invention.
Fig. 2 is a circuit schematic of a digital signal processor.
Fig. 2A is a circuit schematic diagram of control program download.
Fig. 3 is a schematic circuit diagram of the signal acquisition unit a.
Fig. 4 is a schematic circuit diagram of a triangular wave signal generator.
Fig. 5 is a schematic diagram of a temperature acquisition and control circuit.
Fig. 6 is a circuit schematic of the frequency control unit.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples.
Referring to fig. 1, the invention relates to a modulation-demodulation and detection control device suitable for a resonant micro-optical gyroscope, which comprises a power circuit unit, a digital signal processor, a signal acquisition unit A, a signal acquisition unit B, a triangular wave signal generator, a closed-loop feedback unit, a frequency control unit and a temperature control unit. In the invention, the digital signal processor adopts Virtex II series FPGA chips produced by Xilinx company.
The signal acquisition unit A consists of a first preamplifier and an analog-to-digital converter A. And the signal acquisition unit B consists of a second preamplifier and an analog-to-digital converter B. The circuit structure of the signal acquisition unit A is the same as that of the signal acquisition unit B.
The frequency control unit is composed of a voltage conversion circuit and a digital-to-analog converter A. The closed loop feedback unit consists of an analog amplifier and a digital-to-analog converter B. The frequency control unit and the closed loop feedback unit have the same circuit structure.
The signal acquisition unit A acquires a clockwise light path signal f output by the first detector CW-0 After being amplified by the first preamplifier, the digital signal f is output after being converted by an analog-to-digital converter A CW-1 To the digital signal processor;
the signal acquisition unit B acquires the acquired anticlockwise light path signal f output by the second detector CCW-0 After being amplified by a second preamplifier, the signal is converted by an analog-to-digital converter B to output a digital signal f CCW-1 To the digital signal processor;
digital signal processor for receiving digital signal f CW-1 Demodulating and outputting A-path frequency compensation signal f CW-2 For the frequency control unit, the frequency control unit compensates the received A-path frequency compensation signal f CW-2 The voltage signal f is output after passing through a digital-to-analog converter A and a voltage conversion circuit CW-3 A light source; output voltage signal f CW-3 Can be used to adjust the frequency of the light emitted by the light source so that the frequency of the clockwise transmitted light is constant at the resonance point.
Digital signal processor for receiving digital signal f CCW-1 Demodulating and outputting B-path frequency compensation signal f CCW-2 To the feedback unit of the closed loop, the feedback unit,closed loop feedback unit compensates signal f for received B path frequency CCW-2 Outputs a ramp signal f after passing through a digital-to-analog converter B and an analog amplifier CCW-3 Providing a second phase frequency shifter; output ramp signal f CCW-3 And adjusting the frequency of the second phase frequency shifter to ensure that the frequency of the counterclockwise transmission light is constant at a resonance point.
The digital signal processor generates a synchronous clock signal f for system operation FB Sending to a triangular wave signal generator as a triangular wave signal generator to generate a triangular wave modulation signal f SJ With reference to the phase of the generated triangular wave modulation signal f SJ Respectively providing a first phase frequency shifter and a second phase frequency shifter;
the A/D converter C of the temperature control unit first reads a voltage signal f representing the actual temperature of the light source 0 (actual temperature voltage f for short) 0 ) And converting it into actual temperature voltage digital quantity signal f D0 (abbreviated as digital true temperature f D0 ) Outputting to a digital signal processor; the digital actual temperature f D0 The digital signal processor outputs a digital quantity signal f of the set temperature voltage after being adjusted D1 (abbreviation number set temperature f) D1 ) For the D/A converter C, the digital set temperature f D1 After the conversion of the D/A converter C, the voltage signal f representing the set temperature is output 1 To the light source.
In the invention, the power circuit is formed by lapping a conventional chip and a peripheral circuit, and outputs 1.5V, 2.5V, 3V, 3.3V, +5VD, +5V and +/-15V power.
In the present invention, the circuit structures of the signal acquisition unit a and the signal acquisition unit B are the same, and therefore, the description of the circuit connection of the signal acquisition unit B is omitted. The circuit structure of the frequency control unit is the same as that of the closed-loop feedback unit, and therefore, the circuit connection description of the closed-loop feedback unit is omitted. The analog-to-digital converter A and the analog-to-digital converter B adopt 12-bit high-speed A/D of AD series or LTC series; the analog-to-digital converter C adopts AD series or LTC series serial A/D; the digital-to-analog converter A and the digital-to-analog converter B adopt 16-bit D/A of AD series or LTC series; the digital-to-analog converter C adopts AD series or LTC series serial D/A; the first preamplifier, the second preamplifier, the voltage conversion circuit and the analog amplifier all adopt AD series operational amplifiers; the triangular wave generating circuit adopts MAX series general signal generating chip or self-lapping triangular wave generating circuit; the light source adopts a tunable narrow linewidth laser light source, and is provided with a temperature reading and setting port and a PZT adjusting port for controlling the emergent light frequency of the light source.
The connection relationship of the terminals in the circuit schematic diagram is as follows:
referring to fig. 2, a B8 terminal (clock information), an E1 terminal, an E2 terminal, a D1 terminal, a D2 terminal, a C1 terminal, a B4 terminal, a B5 terminal, an A5 terminal, a B6 terminal, an A6 terminal, a B7 terminal, and an A7 terminal (12 data lines) of the FPGA processor U1 are respectively connected to 2 terminals, 7 terminals to 14 terminals, and 17 terminals to 20 terminals (12 data lines) of the digital-to-analog converter a chip U2; the F2 end is connected with the 7 end of a comparator U6 in the signal acquisition unit A; the A9 end (clock information), the A10 end, the B10 end, the A11 end, the B11 end, the A12 end, the B13 end, the C16 end, the D15 end, the D16 end, the E15 end and the E16 end (12 data lines) are connected with a digital-to-analog converter B chip; f16 The end is connected with a comparator in the signal acquisition unit B; an R8 end (clock information), an L1 end, an L2 end, an M1 end, an M2 end, an N1 end, an N2 end, a P1 end, a T3 end, an R4 end, a T4 end, an R5 end, a T5 end, an R6 end, a T6 end, an R7 end and a T7 end (16 data lines) are respectively connected with a 26 end, a 14 end to 1 end, a 28 end and a 27 end (16 data lines) of a digital-to-analog converter A chip U15; a T9 end (clock information), an R9 end, a T10 end, an R10 end, a T11 end, an R11 end, a T12 end, an R13 end, a T14 end, a P16 end, an N15 end, an N16 end, an M15 end, an M16 end, an L15 end and an L16 end (16 data lines) are connected with a digital-to-analog converter B chip; the H1 end, the G1 end, the F1 end and the H2 end are respectively connected with the 13 end, the 15 end, the 2 end and the 1 end of a digital-to-analog converter C chip U11 of the temperature control unit, the R14 end and the G2 end are connected with the 1 end of the digital-to-analog converter C chip U11 of the temperature control unit, and the K1 end, the J1 end and the J2 end are respectively connected with the 5 end, the 4 end and the 7 end of an analog-to-digital converter C chip U14 of the temperature acquisition unit; the P15 end, the C2 end, the A2 end, the P13 end and the T13 end are respectively connected with the 43 end, the 31 end, the 10 end, the 40 end and the 13 end of the download chip U1-1, and the R14 end and the G2 end are connected with the 15 end of the download chip U1-1; the A8 end is connected with the 3 end of the crystal oscillator U1-2; the end T8 is connected with the end 13 of the triangular wave generator chip U7; the K15 end is a gyro information output end; the N13 end, the N4 end, the M12 end, the M5 end, the E12 end, the E5 end, the D13 end and the D4 end are connected with a 1.5V power supply; an end F8, an end F7, an end E8, an end F10, an end F9, an end E9, an end H12, an end H11, an end G11, an end K11, an end J12, an end J11, an end M9, an end L10, an end L9, an end M8, an end L7, an end K6, an end J5, an end H6, an end H5, an end G6, an end B1, an end B16, an end R1 and an end R16 are connected with a 3.3V power supply; the G7 end, the G8 end, the G9 end, the G10 end, the H7 end, the H8 end, the H9 end, the H10 end, the J7 end, the J8 end, the J9 end, the J10 end, the K7 end, the K8 end, the K9 end, the K10 end, the L6 end, the L11 end, the P3 end, the P14 end, the R2 end, the R15 end, the T1 end, the T16 end, the R3 end, the P2 end, the T2 end, the A1 end, the A16 end, the B2 end, the B15 end, the C3 end, the C14 end, the F6 end and the F11 end are grounded in a word.
Referring to fig. 2A, terminals 6, 18, 28 and 41 are respectively connected to a digital ground, terminals 8, 16, 17, 26, 35, 36 and 38 are respectively connected to a 3.3V power supply, terminal 31 is connected to the 3.3V power supply through a resistor R74, a resistor R89 is connected in series between terminals 8 and 13, and a resistor R88 is connected in series between terminals 8 and 15.
Referring to fig. 3, a light intensity signal output by the first detector is connected to the end 3 of the operational amplifier U3 after passing through the filter circuit, the filter circuit is composed of a capacitor C40, a resistor R26, a resistor R20, and a capacitor C48, one end of the capacitor C40 is connected to the output end of the first detector, the other end of the capacitor C40 is connected to the end 2 of the resistor R26, the end 1 of the resistor R26 is connected to analog ground, the end 2 of the resistor R26 is connected to the end 1 of the resistor R20, the end 2 of the resistor R20 is connected to the end 1 of the resistor R21, the end 2 of the resistor R21 is connected to the end 3 of the operational amplifier U3, the capacitor C48 is connected between the end 2 of the resistor R20 and the end 1 of the resistor R21, and the other end of the capacitor C48 is connected to analog ground; the 1 end of the operational amplifier U3 is connected with the 1 end of the differential operational amplifier U4 through a resistor R13, the 2 end is connected with the analog ground through a resistor R25, and the capacitor C50 and the resistor R7 are connected in parallel and then connected between the 1 end and the 2 end; the 4 end is connected with a-5V power supply; the 8 end is connected with a +5V power supply;
the 2 end of the differential operational amplifier U4 is connected with the analog ground through a resistor R13 and a resistor R19 in sequence; the 2 end is connected with the 24 end of a chip U2 of the analog-digital converter A; the 8 end is connected with an analog ground after passing through a resistor R4; the 3 end is connected with a +5V power supply; the 5 end is connected with the 30 end of a chip U2 of the analog-to-digital converter A after passing through a resistor R8, and a capacitor C2 is connected between the 8 end and the 5 end after being connected with a resistor R3 in parallel; the 4 end is connected with the 29 end of the chip U2 of the analog-to-digital converter A through a resistor R15, and the capacitor C43 and the resistor R18 are connected in parallel and then connected between the 4 end and the 1 end; the 6 end is connected with a-5V power supply;
the 4 end of the chip U2 of the analog-to-digital converter A is connected with an analog ground after passing through a resistor R27; the 15 end is connected with a digital ground, and the 16 end is connected with a 2.5V power supply; the 22 terminal is connected with the analog ground through a resistor R2 and is connected with a 3V power supply through a resistor R1; 23 terminating the analog ground; the 25 end is connected with the analog ground after passing through the capacitor C5, the 26 end is connected with the analog ground after passing through the capacitor C17, and the capacitor C15 is connected between the 25 end and the 26 end after being connected with the capacitor C16 in parallel; 27 ends a 3V power supply and 28 ends an analog ground; 31. terminated at analog ground, 32 terminated at 3V.
Referring to fig. 4, the 1 end of the triangular wave signal generating chip U7 is connected to the 10 end through a resistor R53; 8. the end is connected with the end 12, and the resistor R54 is connected with the capacitor C171 in series and then connected with the resistor R73 between the end 8 and the analog ground; the 5 terminal is connected with the analog ground through a capacitor C166; 2, 4, 6, 7, 9, 11 and 18 ends are connected with an analog ground; 15 terminates with digital ground; the 19 end is connected with the 2 end of the primary operational amplifier U9 through a resistor R70; the 20 end is connected with a-5V power supply; the 3 end and the 17 end are connected with a +5V power supply; the 16 end is connected with a digital power supply +5 VD;
the 3 end of the primary operational amplifier U9 is connected with the analog ground through a resistor R68; the resistor R72 is connected between the end 1 and the end 2, and the capacitor C160 is connected with the resistor R51 in series and then connected with the end R69 in parallel and connected with the end 1 and the end 2 of the second-stage operational amplifier; the 4 end is connected with a-5V power supply; the 8 end is connected with a +5V power supply;
the 2 end of the secondary operational amplifier U8 is connected with the 6 end through a resistor R52, and the modulation signals are respectively output to the first phase modulator and the second phase modulator through the 6 end; the 3 end is connected with the analog ground through a resistor R71; the 4 end is connected with a-15V power supply; and the 7 terminal is connected with a +15V power supply.
Referring to fig. 5, the 2 end of the dc regulator chip U10 is connected to a +5V power supply; 4, connecting the analog ground; 6. the end is connected with the end 7 and the end 8 of the digital-to-analog converter C chip U11, and the end 6 is connected with the end 1 of the analog-to-digital converter C chip U14;
the 4 end of the D/A converter C chip U11 is connected with the 3 end of the operational amplifier A chip U12 through a resistor R57; the 5 end is connected with the 3 end of the operational amplifier B chip U13 through a resistor R58; the resistor R63 and the capacitor C124 are connected between the terminal 11 and the analog ground in series; the 3 end and the 10 end are connected with a +5V power supply; 9 ends and 12 ends are connected with an analog ground; the temperature control signal output by the digital-to-analog converter C is sent to the light source through the end 6;
the 3 end of the operational amplifier A chip U12 is connected with the analog ground through a capacitor C112; the 2 end is connected with analog ground through a resistor R61, and a resistor R59 is connected between the 2 end and the 1 end after being connected with a capacitor C120 in parallel; the 1 end is connected with the 16 end of a digital-to-analog converter A chip U15 through a resistor R22, and a capacitor C46 and a capacitor C47 are connected between the 1 end and the analog ground in parallel; the 4 end is connected with a-5V power supply; the 8 end is connected with a +5V power supply;
the 3 end of the operational amplifier B chip U13 is connected with the analog ground through a capacitor C113; the 2 end is connected with the analog ground through a resistor R62, and a resistor R60 and a capacitor C121 are connected between the 2 end and the 1 end in parallel; the 1 end is connected with a digital-to-analog converter B chip; the 4 end is connected with a-5V power supply; the 8 end is connected with a +5V power supply;
the 2 end of the analog-to-digital converter C chip U14 is connected with the light source, and the 3 end is connected with the analog ground; 6, the digital ground is terminated; 8. the terminal is connected with a +5V power supply.
Referring to fig. 6, the terminal 19 of the digital-to-analog converter a is connected to the terminal 3 of the first-stage operational amplifier U16 through a resistor R10, and is connected to analog ground through a resistor R5; the 20 end is connected with the 2 end of the primary operational amplifier U16 through a resistor R14 and is connected with an analog ground through a resistor R17; capacitor C33 is coupled between terminals 19 and 20; 24 ends a digital ground; ends 17 and 18 are connected with an analog ground; the 15 terminal is connected with the analog ground through a capacitor C45; the 21 end is connected with a-5V power supply through a capacitor C9; the 22 end is connected with a-5V power supply through a capacitor C8; the 23 end is connected with a-5V power supply; the 25 end is connected with a +5V power supply;
the 3 end of the primary operational amplifier U16 is connected with the analog ground through a resistor R6; the 5 terminal is connected with the analog ground through a resistor R9; the resistor R23 is connected between the end 2 and the end 1; the resistor R12 is connected between the end 1 and the end 6; the resistor R24 is connected between the 6 terminal and the 7 terminal; the 7 end is connected with the 2 end of a secondary operational amplifier U17 through a resistor R11; 4 ends are connected with a-5V power supply; 8 ends are connected with a +5V power supply;
the 3 end of the second-stage operational amplifier U17 is connected with the analog ground through a resistor R16; the resistor R55 is connected between the 2 end and the 6 end; the end 6 is connected with a light source; the 4 terminal is connected with a-15V power supply; and the 7 terminal is connected with a +15V power supply.
The invention adopts a double-frequency modulation and demodulation and frequency control voltage and temperature simultaneous feedback based on triangular waves, and a clockwise and anticlockwise double-path closed-loop detection control mode. The detailed function of each unit is as follows:
triangular wave signal generator
The triangular wave signal generator mainly generates the required triangular wave modulation signal. A triangular wave modulated signal is generated in phase with the reference signal based on a phase reference provided by a digital signal processor. Because the resonant cavity of the micro-optical gyroscope is very short, the free spectral line width and the full width at half maximum of a resonance valley in the resonance characteristic curve of the micro-optical gyroscope are both very large, and in order to obtain a better modulation effect, the invention adopts a modulation mode of simulating triangular waves (see fig. 1A). The required triangular wave signal can be generated by an integrating circuit or an existing signal generating chip. The resonance characteristic of the micro-optical gyro resonant cavity, the detection precision and the detection range of the gyro determine the waveform parameters of the modulated triangular wave signal.
Signal acquisition unit
The signal acquisition unit comprises a signal acquisition unit A and a signal acquisition unit B, the circuit structures of the two parts are the same, and the two parts are both composed of a preamplifier and an AD converter. The main function of the preamplifier is to convert the current signal after photoelectric conversion into a voltage signal and perform low-noise amplification, so as to meet the requirements of A/D conversion. The preamplifier is designed with attention to the characteristics of the detector output signal and the choice of the gain and bandwidth of the preamplifier. The resonant cavity of the micro-optical gyroscope is short, so that the requirement on modulation frequency is high, and the whole detection control circuit needs to have higher working frequency, so that the point needs to be considered when AD and DA are selected. In order to improve the detection accuracy, the AD conversion is of a differential input type, and therefore a single-input-to-differential-output chip is required before the AD conversion. And D, sending the digital quantity after AD conversion to the FPGA.
Digital signal processor circuit
The invention adopts a method of locking a clockwise light path in a closed loop and detecting the closed loop feedback quantity of a counterclockwise light path to obtain a frequency difference signal so as to obtain the output rotation angular velocity. The time sequences of the triangular wave modulation, AD acquisition and demodulation processes are required to be strictly synchronous, and the conversion delay of each chip is particularly required to be considered during design. The digital signal processor generates a synchronous clock signal of system operation, the synchronous clock signal is sent to the modulation signal generating unit and used as a phase reference of the triangular wave modulation signal, and the generated triangular wave modulation signal is simultaneously sent to the first phase frequency shifter and the second phase frequency shifter.
The digital signal processor gives the working time sequence of each part of the circuit, and comprises a modulation signal reference clock, two paths of signal sampling clocks, a DA conversion clock of the feedback control unit and a sampling and conversion clock of the temperature control part. The reference frequency signal generated by the crystal oscillator generates a conversion clock of a DA converter of a feedback control unit and a sampling clock of an AD converter of a signal acquisition unit through frequency division and frequency multiplication of a DCM (clock management system) in the digital signal processor, and simultaneously controls a demodulation process.
The digital signal processor program calculates a feedback value for controlling the change of the emergent light frequency of the light source according to the voltage signal output by the signal acquisition unit A, and generates a control voltage to be sent to a PZT voltage control end of the light source; meanwhile, temperature control is started, the fact that the fed back PZT voltage cannot reach the edge of a control range is guaranteed, jump of the light source emergent light frequency caused by sudden change of the feedback voltage is avoided, and finally the frequency of clockwise propagating light deviates from a resonance point. And a correction value of the feedback oblique wave is calculated by the voltage signal output by the signal acquisition unit B and is sent to the second phase frequency shifter to control the frequency change of the anticlockwise propagation light so that the frequency change is kept at the resonance frequency point of the anticlockwise light path.
Closed loop feedback unit and frequency control unit
The closed loop feedback unit and the frequency control unit comprise a light source PZT voltage conversion circuit and a ramp wave generation circuit. The input digital signal of the light source PZT voltage conversion circuit is generated by a digital signal processor, and the output current signal of a DA converter is converted into a voltage signal through an amplifier and amplified for controlling the frequency change of the emergent light of the light source. The ramp generating circuit is the same as the light source PZT voltage conversion circuit, and the input signal is a feedback digital ramp signal, is converted into an analog ramp signal and then is sent to the second phase frequency shifter to control the frequency change of the anticlockwise propagation light.
Temperature control unit
The temperature control unit comprises a light source actual temperature acquisition circuit and a light source set temperature output circuit. Because the frequency of light emitted by the light source is greatly influenced by the ambient temperature, the temperature of the light source needs to be controlled to ensure stable operation. Firstly, the voltage which reflects the actual temperature and is given by the light source is converted into digital quantity after AD conversion and then is sent to a digital signal processor, the digital quantity of the set temperature of the light source is solved according to the feedback quantity of the current PZT voltage of the light source through the corresponding conversion relation, and the digital quantity is converted into a voltage value through a DA converter and then is sent to a temperature control end of the light source.
Claims (3)
1. A modulation-demodulation and feedback control device of micro-optical gyroscope is characterized in that: the device consists of a power circuit unit, a digital signal processor, a signal acquisition unit A, a signal acquisition unit B, a triangular wave signal generator, a closed loop feedback unit, a frequency control unit and a temperature control unit;
the signal acquisition unit A acquires the acquired clockwise light path signal f output by the first detector CW-0 After being amplified by the first preamplifier, the digital signal f is converted and output by the A/D converter CW-1 To the digital signal processor;
the signal acquisition unit B acquires the acquired anticlockwise light path signal f output by the second detector CCW-0 After being amplified by the second preamplifier, the digital signal f is converted and output by the analog-to-digital converter B CCW-1 To the digital signal processor;
digital signal processor for receiving digital signal f CW-1 Demodulating and outputting A-path frequency compensation signal f CW-2 For the frequency control unit, the frequency control unit compensates the received A-channel frequency signal f CW-2 The voltage signal f is output after passing through a digital-to-analog converter A and a voltage conversion circuit CW-3 A light source;
digital signal processor for receiving digital signal f CCW-1 Demodulating and outputting B-path frequency compensation signal f CCW-2 For the closed-loop feedback unit, the closed-loop feedback unit compensates the received B-path frequency signal f CCW-2 Outputs a ramp signal f after passing through a digital-to-analog converter B and an analog amplifier CCW-3 Providing a second phase frequency shifter;
the digital signal processor generates a synchronous clock signal f for system operation FB Sending to a triangular wave signal generator as a triangular wave signal generator to generate a triangular wave modulation signal f SJ The generated triangular wave modulation signal f SJ Respectively providing a first phase frequency shifter and a second phase frequency shifter;
the analog-to-digital converter C of the temperature control unit first reads a voltage signal f representing the actual temperature of the light source 0 (simply called actual temperature voltage f) 0 ) And converting it into digital actual temperature voltage signal f D0 (digital temperature voltage f for short) D0 ) Outputting to a digital signal processor; the digital temperature voltage f D0 In the digital signal processor, the output contrast signal f is adjusted D1 To a digital-to-analog converter C, the comparison signal f D1 The voltage representing the set temperature is output after being converted by the digital-to-analog converter CSignal f 1 To the light source.
2. The modem and feedback control device of claim 1, wherein: the circuit structures of the signal acquisition unit A and the signal acquisition unit B are the same, and the circuit structure of the frequency control unit is the same as that of the closed-loop feedback unit; the connection of the circuit is as follows: the B8 end, the E1 end, the E2 end, the D1 end, the D2 end, the C1 end, the B4 end, the B5 end, the A5 end, the B6 end, the A6 end, the B7 end and the A7 end of the FPGA processor U1 are respectively connected with the 2 end, the 7 end to the 14 end and the 17 end to the 20 end of a digital-to-analog converter A chip U2; the F2 end is connected with the 7 end of a comparator U6 in the signal acquisition unit A; the A9 end, the A10 end, the B10 end, the A11 end, the B11 end, the A12 end, the B13 end, the C16 end, the D15 end, the D16 end, the E15 end and the E16 end are connected with a digital-to-analog converter B chip; the F16 end is connected with a comparator in the signal acquisition unit B; the R8 end, the L1 end, the L2 end, the M1 end, the M2 end, the N1 end, the N2 end, the P1 end, the T3 end, the R4 end, the T4 end, the R5 end, the T5 end, the R6 end, the T6 end, the R7 end and the T7 end are respectively connected with the 26 end, the 14 end to the 1 end, the 28 end and the 27 end of a digital-to-analog converter A chip U15; a T9 end, an R9 end, a T10 end, an R10 end, a T11 end, an R11 end, a T12 end, an R13 end, a T14 end, a P16 end, an N15 end, an N16 end, an M15 end, an M16 end, an L15 end and an L16 end are connected with a digital-to-analog converter B chip; the H1 end, the G1 end, the F1 end and the H2 end are respectively connected with the 13 end, the 15 end, the 2 end and the 14 end of a digital-to-analog converter C chip U11 of the temperature control unit, the R14 end and the G2 end are connected with the 1 end of the digital-to-analog converter C chip U11 of the temperature control unit, and the K1 end, the J1 end and the J2 end are respectively connected with the 5 end, the 4 end and the 7 end of the digital-to-analog converter C chip U14 of the temperature acquisition unit; the P15 end, the C2 end, the A2 end, the P13 end and the T13 end are respectively connected with the 43 end, the 31 end, the 10 end, the 40 end and the 13 end of the download chip U1-1, and the R14 end and the G2 end are connected with the 15 end of the download chip U1-1; the A8 end is connected with the 3 end of the crystal oscillator U1-2; the end T8 is connected with the end 13 of the triple-angle generator chip U7; the K15 end is a gyro information output end; the N13 end, the N4 end, the M12 end, the M5 end, the E12 end, the E5 end, the D13 end and the D4 end are connected with a 1.5V power supply; an end F8, an end F7, an end E8, an end F10, an end F9, an end E9, an end H12, an end H11, an end G11, an end K11, an end J12, an end J11, an end M9, an end L10, an end L9, an end M8, an end L7, an end K6, an end J5, an end H6, an end H5, an end G6, an end B1, an end B16, an end R1 and an end R16 are connected with a 3.3V power supply; the G7 end, the G8 end, the G9 end, the G10 end, the H7 end, the H8 end, the H9 end, the H10 end, the J7 end, the J8 end, the J9 end, the J10 end, the K7 end, the K8 end, the K9 end, the K10 end, the L6 end, the L11 end, the P3 end, the P14 end, the R2 end, the R15 end, the T1 end, the T16 end, the R3 end, the P2 end, the T2 end, the A1 end, the A16 end, the B2 end, the B15 end, the C3 end, the C14 end, the F6 end and the F11 end are grounded in a digit manner; the 6 terminal, 18 terminal, 28 terminal, 41 terminal are connected with the digital ground, the 8 terminal, 16 terminal, 17 terminal, 26 terminal, 35 terminal, 36 terminal, 38 terminal are connected with the 3.3V power supply, the 31 terminal is connected with the 3.3V power supply through the resistor R74, the resistor R89 is connected in series between the 8 terminal and 13 terminal, the resistor R88 is connected in series between the 8 terminal and 15 terminal;
the light intensity signal output by the first detector is connected with the end 3 of the operational amplifier U3 after passing through a filter circuit, the filter circuit is composed of a capacitor C40, a resistor R26, a resistor R20 and a capacitor C48, one end of the capacitor C40 is connected with the output end of the first detector, the other end of the capacitor C40 is connected with the end 2 of the resistor R26, the end 1 of the resistor R26 is connected with an analog ground, the end 2 of the resistor R26 is connected with the end 1 of the resistor R20, the end 2 of the resistor R20 is connected with the end 1 of the resistor R21, the end 2 of the resistor R21 is connected with the end 3 of the operational amplifier U3, the capacitor C48 is connected between the end 2 of the resistor R20 and the end 1 of the resistor R21, and the other end of the capacitor C48 is connected with the analog ground; the 1 end of the operational amplifier U3 is connected with the 1 end of the differential operational amplifier U4 through a resistor R13, the 2 end is connected with the analog ground through a resistor R25, and the capacitor C50 and the resistor R7 are connected between the 1 end and the 2 end in parallel; the 4 end is connected with a-5V power supply; the 8 end is connected with a +5V power supply; the 2 end of the differential operational amplifier U4 is connected with the analog ground through a resistor R13 and a resistor R19 in sequence; the end 2 is connected with the end 24 of a chip U2 of the analog-to-digital converter A; the 8 end is connected with an analog ground after passing through a resistor R4; the 3 end is connected with a +5V power supply; the 5 end is connected with the 30 end of a chip U2 of the analog-to-digital converter A after passing through a resistor R8, and a capacitor C2 is connected between the 8 end and the 5 end after being connected with a resistor R3 in parallel; the 4 end is connected with the 29 end of the chip U2 of the analog-to-digital converter A through a resistor R15, and the capacitor C43 and the resistor R18 are connected in parallel and then connected between the 4 end and the 1 end; the 6 end is connected with a-5V power supply; the 4 end of the chip U2 of the analog-to-digital converter A is connected with an analog ground through a resistor R27; 15 ends a digital ground, 16 ends a 2.5V power supply; the 22 terminal is connected with the analog ground through a resistor R2 and is connected with a 3V power supply through a resistor R1; 23, terminating an analog ground; the 25 end is connected with the analog ground after passing through the capacitor C5, the 26 end is connected with the analog ground after passing through the capacitor C17, and the capacitor C15 is connected between the 25 end and the 26 end after being connected with the capacitor C16 in parallel; 27 ends a 3V power supply and 28 ends an analog ground; 31 ends with analog ground, and 32 ends with 3V;
the 1 end of the triangular wave signal generating chip U7 is connected with the 10 end through a resistor R53; the 8 terminal is connected with the 12 terminal, and the resistor R54 is connected with the capacitor C171 in series and then connected with the resistor R73 between the 8 terminal and the analog ground; the 5 terminal is connected with the analog ground through a capacitor C166; 2, 4, 6, 7, 9, 11 and 18 ends are connected with an analog ground; 15. terminating the digital ground; the 19 end is connected with the 2 end of the primary operational amplifier U9 through a resistor R70; the 20 end is connected with a-5V power supply; the 3 end and the 17 end are connected with a +5V power supply; the 16 end is connected with a digital power supply +5 VD; the 3 end of the primary operational amplifier U9 is connected with the analog ground through a resistor R68; the resistor R72 is connected between the end 1 and the end 2, and the capacitor C160 is connected with the resistor R51 in series and then connected with the end R69 in parallel and connected with the end 1 and the end 2 of the second-stage operational amplifier; 4. the end is connected with a-5V power supply; the 8 end is connected with a +5V power supply; the 2 end of the second-stage operational amplifier U8 is connected with the 6 end through a resistor R52, and the modulation signals are respectively output to the first phase modulator and the second phase modulator through the 6 end; 3. the end is connected with the analog ground through a resistor R71; the 4 end is connected with a-15V power supply; the 7 end is connected with a +15V power supply;
the 2 end of the direct current voltage stabilizing chip U10 is connected with a +5V power supply; 4, connecting the analog ground; the 6 end is connected with the 7 end and the 8 end of the digital-to-analog converter C chip U11, and the 6 end is connected with the 1 end of the analog-to-digital converter C chip U14; the 4 end of the D/A converter C chip U11 is connected with the 3 end of the operational amplifier A chip U12 through a resistor R57; 5. the end is connected with the 3 end of the operational amplifier B chip U13 through a resistor R58; the resistor R63 and the capacitor C124 are connected between the terminal 11 and the analog ground in series; the 3 end and the 10 end are connected with a +5V power supply; 9 ends and 12 ends are connected with an analog ground; the temperature control signal output by the digital-analog converter C is sent to the light source through the 6 terminal; the 3 end of the operational amplifier A chip U12 is connected with the analog ground through a capacitor C112; the 2 end is connected with analog ground through a resistor R61, and a resistor R59 is connected between the 2 end and the 1 end after being connected with a capacitor C120 in parallel; the 1 end is connected with the 16 end of a digital-to-analog converter A chip U15 through a resistor R22, and a capacitor C46 and a capacitor C47 are connected between the 1 end and the analog ground in parallel; the 4 end is connected with a-5V power supply; the 8 end is connected with a +5V power supply; the 3 end of the operational amplifier B chip U13 is connected with the analog ground through a capacitor C113; the 2 end is connected with the analog ground through a resistor R62, and a resistor R60 and a capacitor C121 are connected between the 2 end and the 1 end in parallel; the 1 end is connected with a digital-to-analog converter B chip; the 4 end is connected with a-5V power supply; the 8 end is connected with a +5V power supply; the 2 end of the analog-to-digital converter C chip U14 is connected with the light source, and the 3 end is connected with the analog ground; 6, the digital ground is terminated; the 8 end is connected with a +5V power supply;
the 19 end of the digital-to-analog converter A is connected with the 3 end of the first-stage operational amplifier U16 through a resistor R10 and is connected with an analog ground through a resistor R5; the 20 end is connected with the 2 end of the primary operational amplifier U16 through a resistor R14 and is connected with an analog ground through a resistor R17; capacitor C33 is coupled between terminals 19 and 20; 24 terminates with a digital ground; ends 17 and 18 are connected with an analog ground; the 15 end is connected with the analog ground through a capacitor C45; the 21 end is connected with a-5V power supply through a capacitor C9; the 22 end is connected with a-5V power supply through a capacitor C8; the 23 end is connected with a-5V power supply; the 25 end is connected with a +5V power supply; the 3 end of the primary operational amplifier U16 is connected with the analog ground through a resistor R6; the 5 end is connected with the analog ground through a resistor R9; the resistor R23 is connected between the end 2 and the end 1; the resistor R12 is connected between the end 1 and the end 6; the resistor R24 is connected between the 6 terminal and the 7 terminal; the 7 end is connected with the 2 end of a secondary operational amplifier U17 through a resistor R11; 4 ends are connected with a-5V power supply; 8 ends are connected with a +5V power supply; the 3 end of the second-stage operational amplifier U17 is connected with the analog ground through a resistor R16; the resistor R55 is connected between the 2 end and the 6 end; the end 6 is connected with a light source; the 4 terminal is connected with a-15V power supply; and the 7 terminal is connected with a +15V power supply.
3. The modem and feedback control device of claim 1, wherein:
the analog-to-digital converter A and the analog-to-digital converter B adopt 12-bit high-speed A/D of AD series or LTC series; the analog-digital converter C adopts AD series or LTC series serial A/D;
the digital-to-analog converter A and the digital-to-analog converter B adopt 16-bit D/A of AD series or LTC series; the digital-to-analog converter C adopts AD series or LTC series serial D/A;
the first preamplifier, the second preamplifier, the voltage conversion circuit and the analog amplifier all adopt AD series operational amplifiers;
the triangular wave generating circuit adopts an MAX series general signal generating chip or a self-lapping triangular wave generating circuit;
the light source adopts a tunable narrow linewidth laser light source, and is provided with a temperature reading and setting port and a PZT adjusting port for controlling the emergent light frequency of the light source.
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