CN111323614A - Closed-loop disc type optical fiber accelerometer based on moving coil feedback mechanism - Google Patents
Closed-loop disc type optical fiber accelerometer based on moving coil feedback mechanism Download PDFInfo
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- CN111323614A CN111323614A CN202010203948.2A CN202010203948A CN111323614A CN 111323614 A CN111323614 A CN 111323614A CN 202010203948 A CN202010203948 A CN 202010203948A CN 111323614 A CN111323614 A CN 111323614A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
- G01P15/093—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by photoelectric pick-up
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P1/00—Details of instruments
- G01P1/003—Details of instruments used for damping
Abstract
The invention provides a closed-loop disc type optical fiber accelerometer based on a moving coil feedback mechanism, which comprises an elastic disc, a mass block, a probe shell, a DFB light source, a first optical fiber coupler, an optical fiber ring, a second optical fiber coupler, a photoelectric detector, a data acquisition card, a power amplification circuit, a moving coil feedback mechanism and a computer. And a moving coil feedback mechanism loaded with a feedback electric signal applies a feedback force to the elastic disc to realize an electromagnetic force feedback loop of the disc type optical fiber accelerometer. The invention can widen the working frequency band, increase the dynamic range and reduce the nonlinear distortion for the disc type optical fiber accelerometer, and can be widely used in the fields of earthquake monitoring, underwater acoustic detection and the like.
Description
Technical Field
The invention relates to a closed-loop disc type optical fiber accelerometer based on a moving coil feedback mechanism, and belongs to the field of optical fiber sensing and optical measurement.
Background
Accelerometers have a rather long history, dating back to the last 40 th century. The accelerometer has a wide application range, and is a core device of a guidance system, a hydrophone and a seismometer, and the performance of the instruments is directly determined by the accelerometer.
Accelerometers are widely varied and can be broadly classified into electromechanical, MEMS, optical, and fiber-optic types according to their operating principles. Compared with an electromechanical accelerometer, the optical fiber accelerometer has the advantages of high sensitivity, high response speed, large dynamic range, electromagnetic interference resistance, adverse environment influence resistance and the like.
The feedback technology can effectively improve the measurement precision and the measurement range of the accelerometer, generates a feedback signal according to the result measured by the accelerometer, and loads the feedback signal on the accelerometer. The introduction of feedback makes the accelerometer frequency bandwidth and response type mainly determined by the electronic feedback circuit.
Thus, a fibre-optic accelerometer with a feedback mechanism has several advantages.
In 1990, united states of america, Kevin m.killian et al, disclosed a method for reducing noise by changing optical path through closed-loop feedback of an optical fiber accelerometer [ a Resonant fiber optic interferometer with a noise reduction closed loop feedback to a variable path length, US patent 4900918], which utilizes an electrical signal applied to one interference arm of an optical fiber interferometer to change the refractive index of the fiber core, thereby changing the optical phase, forming a feedback loop, and achieving the purpose of suppressing noise.
In 2013, guo wenzhen, et al, university of zhejiang, discloses a three-axis integrated all-fiber inertial sensing system [ a three-axis integrated all-fiber inertial sensing system, CN patent 102305628B ], which adopts a feedback control circuit to provide a feedback signal to an integrated optical waveguide, so as to change the refractive index of the optical waveguide, further change the phase of the optical signal, and form a closed-loop control circuit.
The feedback modes of the above two patents are that the change of the refractive index of the electricity causes the phase change of the optical signal, and the mechanical vibration amplitude of the accelerometer cannot be changed. The feedback force can change the mechanical vibration amplitude of the accelerometer, and the main implementation modes of the feedback force comprise a PZT driving mode, an electromagnetic driving mode and an electrostatic driving mode.
In 2016, Zhangiang et al, Beijing university of aerospace, proposed a micrometer grating accelerometer force feedback system (Zhangiang, Von Lishuang, Zhang Yu, Wangyang. micrometer grating accelerometer force feedback system design, navigation and control, Vol.15, Aug.2016), which adopts an electrostatic force feedback method to realize the force feedback control of a micrometer grating accelerometer and improve the dynamic range of the micrometer grating accelerometer. However, the feedback force generated by electrostatic force feedback is small, and is not suitable for an accelerometer requiring a large feedback force.
In 2010, Geoffrey Bainbridge et al disclose a capacitive seismometer with a moving coil feedback structure (Force-feedback seismometer, US patent 20100226211A 1)]The invention utilizes an electromagnetic coil to apply a feedback force to a pick-up structure of a capacitive seismometer, the feedback force being sufficient to cancel at least 0.2m/s in a predetermined direction of the feedback force2Constant acceleration of the seismic pick-up structure.
Disclosure of Invention
The invention aims to provide a closed-loop disc type optical fiber accelerometer based on a moving coil feedback mechanism in order to realize an electromagnetic force feedback loop of the disc type optical fiber accelerometer.
The purpose of the invention is realized as follows: the optical fiber coupling device comprises an elastic disc 11, a mass block 12, a probe shell 13, a DFB light source 21, a first optical fiber coupler 22, an optical fiber ring 23, a second optical fiber coupler 24, a photoelectric detector 25, a data acquisition card 31, a power amplification circuit 32, a moving coil feedback mechanism 33 and a computer 34, wherein light emitted by the DFB light source 21 is divided into two beams through the first optical fiber coupler 22, enters the second optical fiber coupler 24 through the two optical fiber rings 23 on the two sides of the elastic disc 11 respectively and interferes with the two beams, an interference light signal is converted into an analog electric signal by the photoelectric detector 25, the analog electric signal is acquired by the data acquisition card 31 to obtain a digital electric signal, the digital electric signal is processed by the computer 34 to obtain a digital feedback signal, the digital feedback signal is converted into an analog feedback signal by the data acquisition card 31, the analog feedback signal is loaded onto the moving coil feedback mechanism 33 after being amplified by the power amplification circuit 32, and the moving coil, by controlling the driving current of the DFB light source 21, a sine wave of a specific frequency is applied to the output optical frequency, and the computer 34 demodulates the digital electrical signal output from the data acquisition card 31, thereby forming a phase generation carrier demodulation system.
The invention also includes such structural features:
1. two moving coil feedback structures 33 are respectively arranged on two sides of the elastic disc 11, the two moving coil feedback structures 33 are identical and are symmetrically arranged, each moving coil feedback structure 33 comprises a magnet 14, a magnetic shoe 15, a coil 41 and a supporting cylinder 16, the magnetic shoe 15 is bonded at the center of the shell 13, the magnet 14 is bonded at the center of the magnetic shoe 15, the coil 41 is densely wound and bonded on the supporting cylinder 16, the supporting cylinder 16 is bonded on the mass block 12, and the feedback force exerted by the coil 41 is transmitted to the elastic disc 11 through the supporting cylinder 16 and the mass block 12.
2. If the elastic disc 11 deforms along the axial direction, the optical fiber rings 23 on the two sides of the elastic disc are respectively stretched and compressed, so that the phase difference of optical signals of the two optical fiber rings changes, and the interference light intensity changes and is detected by the photoelectric detector 25;
when the probe shell 13 is subjected to the action of external acceleration, the mass block 12 is subjected to inertia force to drive the elastic disc 11 to move reversely relative to the probe shell 13, the moving coil feedback mechanism 33 applies a feedback force with equal and reverse magnitude to the mass block 12 so as to enable the displacement of the mass block 12 relative to the probe shell 13 to be as small as possible, the feedback force is in direct proportion to the input voltage of the moving coil feedback mechanism 33, the input voltage of the moving coil feedback mechanism 33 is in direct proportion to the external acceleration, and the external acceleration is accurately measured.
3. The computer 34 processes the digital electrical signals output by the data acquisition card 31 by using a PID control algorithm, wherein the PID control algorithm performs laplace transform as follows:
where U(s) is the output term, KpIs a proportionality coefficient, KiIs an integral coefficient, KdIs the differential coefficient, e(s) is the error term.
4. The power amplifying circuit 32 satisfies the following conditions:
1) a power operational amplifier is used as a core device;
2) the power is supplied by +/-15V double ends, the maximum output voltage is 12V, and the maximum output current is 5A.
Compared with the prior art, the invention has the beneficial effects that: the invention discloses a closed-loop disc type optical fiber accelerometer based on a moving coil feedback mechanism. The coil loaded with the feedback electric signal enables the mass block of the disc type optical fiber accelerometer to be acted by the feedback force to form a closed loop control circuit. The feedback structure directly provides mechanical feedback force, can inhibit the vibration amplitude of the disc type optical fiber accelerometer at the resonant frequency, improves the stability of the accelerometer, widens the available frequency band and increases the dynamic range.
(1) The working frequency band is widened, and the response conditions at low frequency and high frequency are improved;
(2) the dynamic range is increased, so that the disc type optical fiber accelerometer can measure larger acceleration in a small mechanical frame;
(3) the linearity of the acceleration response is improved, and the nonlinear distortion of the measured signal is reduced.
Drawings
FIG. 1 is a schematic diagram of a disc-type fiber optic accelerometer system;
FIG. 2 is a schematic diagram of the internal structure of a disc type optical fiber acceleration probe;
FIG. 3 is a schematic diagram of a closed-loop disc-type fiber optic accelerometer system based on a moving coil feedback mechanism;
FIG. 4 is a schematic diagram of a closed-loop disc type fiber optic accelerometer probe based on a moving coil feedback mechanism;
FIG. 5 is a theoretically derived amplitude-frequency response curve and phase-frequency response curve of an accelerometer.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
With reference to fig. 1 to 5, the present invention includes an elastic disc 11, a mass block 12, a probe housing 13, a DFB light source 21, a first fiber coupler 22, a fiber ring 23, a second fiber coupler 24, a photodetector 25, a data acquisition card 31, a power amplification circuit 32, a moving coil feedback mechanism 33, and a computer 34, wherein a line a1 is provided between the DFB light source 21 and the first fiber coupler 22, lines a2 and a3 are provided between the fiber ring 23 and the first fiber coupler 22, and lines b1 and b2 are provided between the fiber ring 23 and the second fiber coupler 24.
1) Light emitted by the DFB light source 21 is divided into two beams through the first optical fiber coupler 22, the two beams enter the second optical fiber coupler 24 through the two optical fiber rings 23 on the two sides of the elastic disc 11 respectively and interfere with each other, interference light signals are converted into analog electric signals by the photoelectric detector 25, the analog electric signals are acquired by the data acquisition card 31 to obtain digital electric signals, the digital electric signals are processed by the computer 34 to obtain digital feedback signals, the digital feedback signals are converted into analog feedback signals by the data acquisition card 31, the analog feedback signals are amplified by the power amplification circuit 32 and then loaded onto the moving coil feedback mechanism 33, and the moving coil feedback mechanism 33 applies feedback force to the mass block 12;
2) if the elastic disc 11 deforms along the axial direction, the optical fiber rings 23 on the two sides of the elastic disc are respectively stretched and compressed, so that the phase difference of optical signals of the two optical fiber rings changes, and the interference light intensity changes and is detected by the photoelectric detector 25;
3) when the probe shell 13 is subjected to the action of external acceleration, the mass block 12 is subjected to inertia force to drive the elastic disc 11 to move reversely relative to the probe shell 13, the moving coil feedback mechanism 33 applies equal and reverse feedback force to the mass block 12 to enable the displacement of the mass block 12 relative to the probe shell 13 to be as small as possible, and because the inertia force sensed by the elastic disc 11 and the mass block 12 is in direct proportion to the external acceleration and the feedback force is in direct proportion to the input voltage of the moving coil feedback mechanism 33, the input voltage of the moving coil feedback mechanism 33 is in direct proportion to the external acceleration, and the external acceleration can be accurately measured.
The moving coil feedback structure 33 is composed of a magnet 14, a magnetic shoe 15, a coil 41 and a supporting cylinder 16,
1) two sides of the elastic disc 11 are respectively provided with a moving coil feedback structure 33, and the two moving coil feedback structures 33 are the same and are symmetrically arranged;
2) the magnetic shoe 15 is adhered to the center of the shell 13, the magnet 14 is adhered to the center of the magnetic shoe 15, the coil 41 is densely wound and adhered to the supporting cylinder 16, the supporting cylinder 16 is adhered to the mass block 12, and the feedback force exerted by the coil 41 is transmitted to the elastic disc 11 through the supporting cylinder 16 and the mass block 12;
3) the magnet 14 is a rare earth magnet, and can provide a magnetic field with higher strength compared with a common magnet, and can generate larger acting force on a coil loaded with the same current;
4) the magnetic shoe 15 can restrain the magnetic field of the magnet 14 inside the magnetic shoe 15, increase the magnetic field strength at the coil 41, and make the direction of the magnetic field perpendicular to the axial direction of the coil 41, thereby maximizing the acting force applied on the coil 41.
The computer 34 processes the digital electrical signals output by the data acquisition card 31 by adopting a PID control algorithm, and the PID control algorithm performs Laplace transform as follows:
where U(s) is the output term, KpIs a proportionality coefficient, KiIs an integral coefficient, KdIs the differential coefficient, e(s) is the error term, and s is the frequency.
The power amplifying circuit 32 adopts a power operational amplifier as a core device, adopts +/-15V double-end power supply, and has the maximum output voltage of 12V and the maximum output current of 5A.
The drive current of the DFB light source (21) is controlled to load sine waves with specific frequency on the output light frequency, and the computer (34) demodulates the digital electric signals output by the data acquisition card (31) to form a phase generation carrier demodulation system.
The moving coil motor is one kind of linear motor and has the advantages of no lag, high response, high precision, etc. The magnetic circuit formed by the magnet 14 and the magnetic shoe 15 provides a substantially uniform magnetic field B over the stroke of the coil 41 of the moving coil motor. When the coil 41 inputs the current I, the voltage balance equation of the moving coil motor is as follows:
in the formula, U is coil voltage, R is coil resistance, L is coil inductance, N is the number of coil turns, L is the length of each coil turn, and v is the speed of the coil cutting magnetic induction line.
The coil 41 is acted by electromagnetic force in the magnetic field, and the magnitude and direction of the electromagnetic force applied to the coil 41 of the moving coil motor can be changed by changing the magnitude and direction of the input current I of the coil 41. The stress magnitude can be obtained by an electromagnetic force calculation formula: when the moving coil motor actually works, the coil 41 overcomes the damping and the elastic force of the elastic disc 11 to enable the mass block 12 to perform acceleration and deceleration movement, and the dynamic balance equation of the moving coil motor is as follows:
where x is the axial displacement of coil 41 relative to probe housing 13, m is the mass of mass 12, c is the damping coefficient of puck 11, and k is the spring coefficient of puck 11.
The electromechanical coupling mathematical model of the accelerometer based on the moving coil motor can be obtained by the formulas (2) and (3) as follows:
the invention relates to a technical improvement of a disc type optical fiber accelerometer. The working principle of the disc type optical fiber accelerometer is shown in fig. 1. Light emitted by the DFB light source 21 is divided into two beams by the first optical fiber coupler 22, the two beams enter the second optical fiber coupler 24 through the two optical fiber rings on the two sides of the elastic disc 11 respectively and interfere with each other, interference optical signals are converted into analog electric signals by the photoelectric detector 25, and the data acquisition card 31 acquires the analog electric signals to generate digital electric signals and transmits the digital electric signals to the computer 34. When the external acceleration acts on the elastic disc 11, the mass block 12 drives the elastic disc 11 to displace along the axial direction, the optical fiber rings 23 on the two sides of the elastic disc are stretched and compressed respectively, so that the phase difference of optical signals of the two optical fiber rings is changed, the interference light intensity is changed and is detected by the photoelectric detector 25, and the external acceleration can be obtained.
The internal structure of the disc type optical fiber accelerometer probe is shown in fig. 2, and the elastic disc type structure can be equivalent to a model that a mass block is connected with an external frame through a damper and a spring. The transfer function of this system is:
where Y(s) is the displacement of the mass relative to the housing and W(s) is the acceleration of the housing.
The moving coil feedback mechanism 33 added on the disc type optical fiber accelerometer is a negative feedback system, the computer 34 processes the electric signal by adopting a PID control algorithm and obtains a feedback signal, and the transfer function of the whole system after the feedback system is added becomes:
wherein P is NBl, K1Is the open loop gain factor.
Considering only the proportional term of the PID control algorithm, it can be obtained that the system resonance frequency is increased from
Become into
System gain reduction factor of
It can be seen that with the addition of feedback, the passband response drops by 40lg (x) dB if the upper frequency limit of the system becomes x times the original.
Fig. 5 is an amplitude-frequency response curve and a phase-frequency response curve of the transfer function of the accelerometer system with and without feedback, and the proportional coefficient of the set PID algorithm is 5, the integral coefficient is 0.3, and the differential coefficient is 0.04. It can be seen that the disc fibre-optic accelerometer has a wider operating frequency band when a suitable feedback signal is introduced.
The invention is described with reference to specific parameters:
as shown in fig. 3, the closed-loop disc-type fiber optic accelerometer based on the moving coil feedback mechanism has the following device selection and parameters:
(1) the wavelength tuning range 1530-1570nm of the DFB light source 21 and the output power 10 mW;
(2) the first optical fiber coupler 22 and the second optical fiber coupler 24 adopt 3dB optical fiber couplers;
(3) the photodetector 25 employs a photodiode;
(4) the data acquisition card 31 adopts a 16-bit high-speed acquisition card;
(5) the power amplifying circuit 32 adopts a power operational amplifier as a core device, adopts +/-15V double-end power supply, and has the maximum output voltage of 12V and the maximum output current of 5A.
The closed-loop disc type fiber optic accelerometer probe is shown in fig. 4, and the device selection and parameters are as follows:
(1) the probe shell 13 is made of aluminum alloy;
(2) the magnetic shoe 15 is made of silicon steel with excellent magnetic conductivity;
(3) the magnet 14 is a neodymium iron boron magnet;
(4) the coil 41 is wound by adopting an enameled wire, and 3 layers of the enameled wire are densely wound on the supporting cylinder 16, wherein each layer is 80 circles;
(5) the supporting cylinder 16 is made of aluminum alloy;
(6) the mass block 12 is made of stainless steel and has a mass of 100 g;
(7) the outer radius of the elastic disc 11 is 50mm, the inner radius thereof is 8mm, and the thickness thereof is 1 mm.
The working process of the closed-loop disc type optical fiber accelerometer is as follows:
light emitted by the light source 21 is divided into two beams through the first optical fiber coupler 22, the two beams enter two optical fiber rings on two sides of the elastic disc 11 respectively, the two beams enter the second optical fiber coupler 24 after passing through the optical fiber ring 23 to generate interference, the photoelectric detector 25 converts an interference light signal into an electric signal, the electric signal is collected through the data acquisition card 31 and then transmitted to the computer 34, the computer 34 processes the data to obtain a digital feedback signal and transmits the digital feedback signal back to the data acquisition card 31, the data acquisition card 31 converts the digital feedback signal into an analog feedback signal, the analog feedback signal is amplified through the power amplification circuit 32 and then loaded onto the coil 41, and the coil 41 applies a feedback force to the mass block 12.
If the elastic disc 11 deforms along the axial direction, the optical fiber rings 23 on the two sides of the elastic disc are stretched and compressed respectively, so that the phase difference of the optical signals of the two optical fiber rings changes, and the interference light intensity changes and is detected by the photoelectric detector 25. When the probe shell 13 is subjected to external acceleration, the mass block 12 is subjected to inertia force to drive the elastic disc 11 to move reversely relative to the probe shell 13, and the moving coil feedback mechanism 33 applies a feedback force with equal magnitude and reverse direction to the mass block 12 so as to ensure that the displacement of the mass block 12 relative to the probe shell 13 is as small as possible. Since the inertial force sensed by the elastic disc 11 and the mass block 12 is proportional to the external acceleration, and the feedback force is proportional to the input voltage of the moving coil feedback mechanism 33, the input voltage of the moving coil feedback mechanism 33 is proportional to the external acceleration.
In summary, the present invention provides a closed-loop disc type fiber optic accelerometer based on a moving coil feedback mechanism, which includes an elastic disc, a mass block, a probe housing, a DFB light source, a first fiber coupler, a fiber ring, a second fiber coupler, a photodetector, a data acquisition card, a power amplification circuit, a moving coil feedback mechanism, and a computer. And a moving coil feedback mechanism loaded with a feedback electric signal applies a feedback force to the elastic disc to realize an electromagnetic force feedback loop of the disc type optical fiber accelerometer. The invention can widen the working frequency band, increase the dynamic range and reduce the nonlinear distortion for the disc type optical fiber accelerometer, and can be widely used in the fields of earthquake monitoring, underwater acoustic detection and the like.
Claims (9)
1. A closed-loop disc type optical fiber accelerometer based on a moving coil feedback mechanism is characterized in that: the optical fiber sensor comprises an elastic disc (11), a mass block (12), a probe shell (13), a DFB light source (21), a first optical fiber coupler (22), an optical fiber ring (23), a second optical fiber coupler (24), a photoelectric detector (25), a data acquisition card (31), a power amplification circuit (32), a moving coil feedback mechanism (33) and a computer (34), wherein light emitted by the DFB light source (21) is divided into two beams through the first optical fiber coupler (22), the two beams enter the second optical fiber coupler (24) through the two optical fiber rings (23) on the two sides of the elastic disc (11) respectively and interfere with each other, an interference light signal is converted into an analog electric signal by the photoelectric detector (25), the analog electric signal is acquired through the data acquisition card (31) to obtain a digital electric signal, the digital electric signal is processed by the computer (34) to obtain a digital feedback signal, and the digital feedback signal is converted into an analog feedback signal by the data acquisition card (, the analog feedback signal is amplified by the power amplifying circuit (32) and then loaded on the moving coil feedback mechanism (33), the moving coil feedback mechanism (33) applies feedback force to the mass block (12), sine waves with specific frequency are loaded on the output light frequency by controlling the driving current of the DFB light source (21), and the computer (34) demodulates the digital electric signals output by the data acquisition card (31) to form a phase generation carrier demodulation system.
2. A closed-loop disc-type fibre-optic accelerometer based on a moving-coil feedback mechanism according to claim 1, characterized in that: the two moving coil feedback structures (33) are respectively arranged on two sides of the elastic disc (11), the two moving coil feedback structures (33) are identical and symmetrically arranged, each moving coil feedback structure (33) comprises a magnet (14), a magnetic shoe (15), a coil (41) and a supporting cylinder (16), the magnetic shoe (15) is bonded at the center of the shell (13), the magnet (14) is bonded at the center of the magnetic shoe (15), the coil (41) is densely wound and bonded on the supporting cylinder (16), the supporting cylinder (16) is bonded on the mass block (12), and the feedback force applied by the coil (41) is transmitted to the elastic disc (11) through the supporting cylinder (16) and the mass block (12).
3. A closed-loop disc-type fibre-optic accelerometer based on a moving-coil feedback mechanism according to claim 1 or 2, wherein: if the elastic disc (11) deforms along the axial direction, the optical fiber rings (23) on the two sides of the elastic disc are stretched and compressed respectively, so that the phase difference of optical signals of the two optical fiber rings is changed, the interference light intensity is changed and is detected by the photoelectric detector (25);
when the probe shell (13) is acted by external acceleration, the mass block (12) is acted by inertia force to drive the elastic disc (11) to move reversely relative to the probe shell (13), the moving coil feedback mechanism (33) applies equal and reverse feedback force to the mass block (12) so as to enable the displacement of the mass block (12) relative to the probe shell (13) to be as small as possible, the feedback force is in direct proportion to the input voltage of the moving coil feedback mechanism (33), the input voltage of the moving coil feedback mechanism (33) is in direct proportion to the external acceleration, and the external acceleration is accurately measured.
4. A closed-loop disc-type fibre-optic accelerometer based on a moving-coil feedback mechanism according to claim 1 or 2, wherein: the computer (34) processes the digital electric signals output by the data acquisition card (31) by adopting a PID control algorithm, and the PID control algorithm carries out Laplace transform as follows:
where U(s) is the output term, KpIs a proportionality coefficient, KiIs an integral coefficient, KdIs the differential coefficient, e(s) is the error term.
5. A closed-loop disc-type fibre-optic accelerometer based on a moving-coil feedback mechanism according to claim 3, wherein: the computer (34) processes the digital electric signals output by the data acquisition card (31) by adopting a PID control algorithm, and the PID control algorithm carries out Laplace transform as follows:
where U(s) is the output term, KpIs a proportionality coefficient, KiIs an integral coefficient, KdIs the differential coefficient, e(s) is the error term.
6. A closed-loop disc-type fibre-optic accelerometer based on a moving-coil feedback mechanism according to claim 1 or 2, wherein: the power amplification circuit (32) satisfies the following conditions:
1) a power operational amplifier is used as a core device;
2) the power is supplied by +/-15V double ends, the maximum output voltage is 12V, and the maximum output current is 5A.
7. A closed-loop disc-type fibre-optic accelerometer based on a moving-coil feedback mechanism according to claim 3, wherein: the power amplification circuit (32) satisfies the following conditions:
1) a power operational amplifier is used as a core device;
2) the power is supplied by +/-15V double ends, the maximum output voltage is 12V, and the maximum output current is 5A.
8. A closed-loop disc type optical fiber accelerometer based on moving coil feedback mechanism according to claim 4, characterized in that: the power amplification circuit (32) satisfies the following conditions:
1) a power operational amplifier is used as a core device;
2) the power is supplied by +/-15V double ends, the maximum output voltage is 12V, and the maximum output current is 5A.
9. A closed-loop disc type optical fiber accelerometer based on moving coil feedback mechanism according to claim 5, characterized in that: the power amplification circuit (32) satisfies the following conditions:
1) a power operational amplifier is used as a core device;
2) the power is supplied by +/-15V double ends, the maximum output voltage is 12V, and the maximum output current is 5A.
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| CN112698384A (en) * | 2021-01-26 | 2021-04-23 | 哈尔滨工程大学 | Low-frequency large dynamic optical fiber seismometer device based on double closed-loop feedback |
| CN112924720A (en) * | 2021-01-26 | 2021-06-08 | 东南大学 | MOEMS accelerometer signal extraction device based on light source fluctuation suppression technology |
| CN112946730A (en) * | 2021-01-26 | 2021-06-11 | 哈尔滨工程大学 | Low-frequency large dynamic double closed-loop feedback method for optical fiber seismometer |
| CN113466929A (en) * | 2021-06-04 | 2021-10-01 | 中国地质大学（武汉） | Three-component optical fiber type seismic accelerometer based on quantum weak value amplification |
| EP4116722A4 (en) * | 2021-05-24 | 2023-10-04 | Honor Device Co., Ltd. | Motor damping measurement methods and system |
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