CN113655414B - Optical magnetic field sensing system using piezoelectric ceramics to generate resonance frequency band - Google Patents
Optical magnetic field sensing system using piezoelectric ceramics to generate resonance frequency band Download PDFInfo
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- CN113655414B CN113655414B CN202111003930.9A CN202111003930A CN113655414B CN 113655414 B CN113655414 B CN 113655414B CN 202111003930 A CN202111003930 A CN 202111003930A CN 113655414 B CN113655414 B CN 113655414B
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- 239000000919 ceramic Substances 0.000 title claims abstract description 34
- 230000003287 optical effect Effects 0.000 title claims abstract description 34
- 239000013307 optical fiber Substances 0.000 claims abstract description 20
- 230000010287 polarization Effects 0.000 claims abstract description 14
- 230000035945 sensitivity Effects 0.000 claims abstract description 6
- 239000003292 glue Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 claims description 2
- 230000008569 process Effects 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 3
- 230000010354 integration Effects 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 2
- 229910001329 Terfenol-D Inorganic materials 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/032—Measuring direction or magnitude of magnetic fields or magnetic flux using magneto-optic devices, e.g. Faraday or Cotton-Mouton effect
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Measuring Magnetic Variables (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention discloses an optical magnetic field sensing system for generating resonance frequency bands by piezoelectric ceramics, wherein a transmitting end of a tunable laser, an attenuator, a polarization controller and an optical fiber cone are sequentially connected, the optical fiber cone is coupled with the magnetic field sensing system through evanescent waves at an optical fiber cone region, light which is coupled into the magnetic field sensing system is coupled out through the optical fiber cone and then is sent into a photoelectric detector, alternating current/direct current signals are separated through a T-shaped bias device, and are respectively sent into an oscilloscope for display, an electric spectrometer and a network analyzer for display, and are sent into a PID control box for outputting wavelengths of the laser; the piezoelectric ceramic generates the resonance frequency band by generating the ultrasonic wave with the frequency in the middle of the resonance frequency of two mechanical modes of the hollow tube cavity, overcomes the defect of large fluctuation of the system sensitivity along with the change of the detection frequency caused by the over-narrow line width, and has the advantages of small volume, high integration level, low loss, low power consumption and electromagnetic interference resistance.
Description
Technical Field
The invention relates to an optical magnetic field sensing system for generating a resonance frequency band by piezoelectric ceramics, in particular to an optical magnetic field sensing system constructed by the piezoelectric ceramics, magnetostrictive media and an optical resonant cavity, belonging to the optical field.
Background
The magnetic field sensor is widely applied to the fields of digital economy, transportation, life health, national defense and the like, and the implementation modes are various. Compared with the existing magnetic field sensing method, the magnetic field sensing technology based on the optical system has the advantages of high speed, strong electromagnetic interference resistance and the like. The echo wall is a type of cavity which is more explored in recent years, the total internal reflection principle of light is mainly utilized, and light meeting the conditions can be limited in a microcavity when the phase coherent superposition condition is achieved in the cavity, and the size of the cavity can be compared with the wavelength of light waves. Therefore, the device can achieve a higher Q value and a smaller mode volume, and can meet the requirement of device integration, and in the echo wall mode hollow cavity magnetic field sensing system, the mechanical mode is utilized to be close to the frequency of an alternating current magnetic field to be detected so as to generate resonance, so that the method is a preferable scheme for increasing the sensing sensitivity of the echo wall mode hollow cavity magnetic field sensing system. However, since the linewidth of the frequency spectrum line of the mechanical mode is extremely narrow, when the scheme is applied to the operation of the sensing system, if a certain distance exists between the frequency of the alternating current magnetic field to be detected and the frequency of the mechanical mode, the detection sensitivity of the system is reduced, so that the application of the device is limited.
Disclosure of Invention
The invention provides an optical magnetic field sensing system for generating a resonance frequency band by using piezoelectric ceramics, which aims at overcoming the defects of the prior art and belongs to the field of optical devices.
An optical magnetic field sensing system for generating a resonance frequency band by using piezoelectric ceramics, wherein the sensing system comprises a first signal generator, a second signal generator, a tunable laser, an attenuator, a polarization controller, an optical fiber cone, piezoelectric ceramics, a magnetic field sensing system, a photoelectric detector, a T-shaped biaser, an oscilloscope, a beam splitter, an spectrometer, a network analyzer and a PID control box; the magnetic field sensing system comprises a magnetostriction medium, a hollow tube cavity, a bracket and glue.
One path of signals output by the first signal generator is regulated and controlled by the PID control box and then is sent to a voltage tuning port of the tunable laser, and the other path of signals is sent to the oscilloscope; the second signal generator outputs a signal to the piezoelectric ceramic; the light emergent end of the tunable laser is connected with the input end of the attenuator, the output end of the attenuator is connected with the input end of the polarization controller, and the output end of the polarization controller is connected with the input end of the optical fiber cone; the optical field at the optical fiber cone area enters a hollow tube cavity of the magnetic field sensing system in an evanescent wave coupling mode, the optical field in the hollow tube cavity is coupled and output to a receiving end of a corresponding photoelectric detector through the optical fiber cone, signals output by the photoelectric detector are separated into alternating current/direct current signals through a T-shaped bias device, the direct current signals are sent to an oscilloscope for display, the alternating current signals are sent to an spectrometer and a network analyzer for display through a beam splitter, and meanwhile, signals output by the beam splitter are sent to a PID control box for frequency locking. The hollow cavity is fixed on the bracket by glue, the hollow cavity is fixed with the magnetostriction medium by the glue, and the hollow cavity is fixed with the piezoelectric ceramics by the glue.
The tunable laser, the attenuator, the polarization controller, the optical fiber cone and the photoelectric detector in the test sensing system are all connected by adopting optical fibers; the first signal generator and the PID control box are connected by using an electric cable, and the PID control box is connected with the tunable laser, the first signal generator and the oscilloscope, the second signal generator and the piezoelectric ceramic, the photoelectric detector and the T-shaped biaser, the T-shaped biaser and the oscilloscope, the T-shaped biaser and the beam splitter, the beam splitter and the electric spectrometer, the beam splitter and the network analyzer and the beam splitter and the PID control box.
The relative position of the magnetostrictive medium and the hollow cavity in the magnetic field sensing system is required to ensure that the magnetostrictive medium can drive the hollow cavity to deform when an external magnetic field acts, so that the intensity of transmitted light in the hollow cavity is changed; the magnetostrictive medium is Terfenol-D or other medium which can stretch under the action of a magnetic field.
The piezoelectric ceramic is driven by a signal generator through generating signals with corresponding frequencies, and ultrasonic waves with corresponding frequencies are generated, so that the controlled frequency of the piezoelectric ceramic is in the middle of the resonance frequency of two mechanical modes of the hollow tube cavity, and a resonance frequency band is generated.
Preferably, the hollow cavity is of a hollow structure, the wall thickness is micron-millimeter, the outer diameter is micron-centimeter, the specific wall thickness and the outer diameter size can be determined according to the sensitivity requirement in the practical application process, but the resonance frequency of the mechanical mode of the hollow cavity is ensured not to exceed the maximum ultrasonic frequency which can be generated by the piezoelectric ceramic.
Preferably, the positions of the piezoelectric ceramic and the magnetostrictive medium can be changed. But the vibration reduction effect and the stress of the magnetostrictive medium to the hollow cavity are ensured.
Preferably, the optical fiber is provided to ensure low loss transmission of optical signals within the selected wavelength band.
Preferably, the polarization state of the polarization controller is such that the optical quality factor of the optical mode is the highest.
Preferably, the attenuator is provided to ensure that the optical power reaching the detector is within the acceptable power range of the detector.
The sensing system can perform high-sensitivity magnetic field sensing, has good stability, and simultaneously has the capability of resisting external interference when transmitting signals. In addition, the system is mainly constructed by optical fibers, has small volume and easy integration, and can carry out remote detection of magnetic field information.
Drawings
FIG. 1 is a schematic diagram of an inventive optical magnetic field sensing system using piezoelectric ceramics to generate resonance frequency bands.
Detailed Description
The essential features and significant developments of the invention are further elucidated with the aid of the following specific embodiments, to which, however, the context of the invention is not limited:
The first embodiment is as follows: as shown in fig. 1, in the optical magnetic field sensing system using piezoelectric ceramics to generate resonance frequency band according to the present embodiment, two paths of signals output by the first signal generator 1 are regulated and controlled by the PID control box 15, and then sent to the voltage tuning port of the tunable laser 3, and one path of signals is sent to the oscilloscope 11; the second signal generator 2 outputs a signal to the piezoelectric ceramic 7; the light emergent end of the tunable laser 3 is connected with the input end of the attenuator 4, the output end of the attenuator 4 is connected with the input end of the polarization controller 5, and the output end of the polarization controller 5 is connected with the input end of the optical fiber cone 6; the optical field at the cone region of the optical fiber cone 6 enters the hollow tube cavity of the magnetic field sensing system 8 in an evanescent wave coupling mode, the optical field in the hollow tube cavity is coupled and output to the receiving end of the corresponding photoelectric detector 9 through the optical fiber cone 6, the output port of the photoelectric detector 9 is connected with the T-shaped biaser 10, the T-shaped biaser 10 is respectively connected with the oscilloscope 11 and the beam splitter 12, and the beam splitter 12 is connected with the spectrometer 13, the network analyzer 14 and the PID control box 15. And then obtaining a mechanical mode spectral line of the magnetic field sensing system through an electric spectrometer under the condition of no alternating current magnetic field to be detected, and then starting the piezoelectric ceramic 7 after finding out a target formant, and setting the working frequency between two formant frequencies. When the alternating current magnetic field to be detected appears and the working frequency is in the resonance frequency band, the system can be used for detecting the alternating current magnetic field with high sensitivity.
Claims (7)
1. An optical magnetic field sensing system using piezoelectric ceramics to generate resonance frequency band, characterized in that: the device comprises a first signal generator (1), a second signal generator (2), a tunable laser (3), an attenuator (4), a polarization controller (5), an optical fiber cone (6), piezoelectric ceramics (7), a magnetic field sensing system (8), a photoelectric detector (9), a T-shaped biaser (10), an oscilloscope (11), a beam splitter (12), a spectrometer (13), a network analyzer (14) and a PID control box (15);
The magnetic field sensing system (8) comprises a magnetostriction medium, a hollow cavity, a bracket and glue; the hollow cavity is fixed on the bracket by glue, the hollow cavity is fixed with the magnetostriction medium by the glue, and the hollow cavity is fixed with the piezoelectric ceramics (7) by the glue;
One path of two paths of signals output by the first signal generator (1) is regulated and controlled by a PID control box (15) and then is sent to a voltage tuning port of the tunable laser (3), and the other path of signals is sent to an oscilloscope (11); the second signal generator (2) outputs a signal to the piezoelectric ceramic (7); the light emergent end of the tunable laser (3) is connected with the input end of the attenuator (4), the output end of the attenuator (4) is connected with the input end of the polarization controller (5), and the output end of the polarization controller (5) is connected with the input end of the optical fiber cone (6); the optical field at the cone region of the optical fiber cone (6) enters a hollow tube cavity of the magnetic field sensing system (8) in an evanescent wave coupling mode, the optical field in the hollow tube cavity is coupled and output to a receiving end of a corresponding photoelectric detector (9) through the optical fiber cone (6), signals output by the photoelectric detector (9) are separated into alternating current/direct current signals through a T-shaped biaser (10), the direct current signals are sent to an oscilloscope (11) for display, and the alternating current signals are sent to an spectrometer (13), a network analyzer (14) and a PID control box (15) through a beam splitter (12) for signal display and frequency locking; the piezoelectric ceramic is driven by a signal generator through generating signals with corresponding frequencies, and ultrasonic waves with corresponding frequencies are generated, so that the controlled frequency of the piezoelectric ceramic is in the middle of the resonance frequency of two mechanical modes of the hollow tube cavity, and a resonance frequency band is generated.
2. The optical magnetic field sensing system for generating a resonance frequency band with piezoelectric ceramics according to claim 1, wherein: the frequency of the alternating current magnetic field to be measured and the mechanical mode resonance frequency of the hollow tube cavity in the magnetic field sensing system are not more than the maximum ultrasonic frequency which can be driven by the piezoelectric ceramics.
3. The optical magnetic field sensing system for generating a resonance frequency band with piezoelectric ceramics according to claim 1, wherein: the piezoelectric ceramic is arranged on a bracket of the magnetic field sensing system and can drive the hollow cavity to generate forced vibration; meanwhile, the hollow tube cavity is also subjected to the action of magnetostriction medium, so that the magnetic field response capability of the hollow tube cavity is ensured; the specific installation position is not required to be strictly required, and only the requirement of the application can be met.
4. The optical magnetic field sensing system for generating a resonance frequency band with piezoelectric ceramics according to claim 1, wherein: the hollow tube cavity is of a hollow structure, the wall thickness is 1 micron-1 mm, the outer diameter is 100 microns-5 cm, and the specific wall thickness and the outer diameter size can be determined according to the sensitivity and the frequency requirement in the practical application process.
5. The optical magnetic field sensing system for generating a resonance frequency band with piezoelectric ceramics according to claim 1, wherein: the polarization state of the polarization controller is required to ensure that the optical quality factor of the optical mode is the highest.
6. The optical magnetic field sensing system for generating a resonance frequency band with piezoelectric ceramics according to claim 1, wherein: the optical fiber ensures low loss transmission of optical signals within the selected wavelength band.
7. The optical magnetic field sensing system for generating a resonance frequency band with piezoelectric ceramics according to claim 1, wherein: the attenuator is described to ensure that the optical power reaching the detector is within the acceptable power range of the detector.
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| CN202111003930.9A CN113655414B (en) | 2021-08-30 | 2021-08-30 | Optical magnetic field sensing system using piezoelectric ceramics to generate resonance frequency band |
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| CN113655414B true CN113655414B (en) | 2024-05-07 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1678133A (en) * | 2004-03-31 | 2005-10-05 | 三洋电机株式会社 | Transmitting apparatus, sound sensor and autonomous traveling vehicle |
| CN101051030A (en) * | 2006-04-04 | 2007-10-10 | 株式会社东芝 | Magnetic resonance imaging apparatus and imaging condition enactment method for the same |
| CN110412486A (en) * | 2019-07-10 | 2019-11-05 | 杭州电子科技大学 | Optical Hollow Lumen Magnetic Field Sensing System with Optimum Sensitivity Frequency and Position Tunable |
| CN111580024A (en) * | 2020-04-30 | 2020-08-25 | 杭州电子科技大学 | An optical resonant magnetic field sensor with wide frequency band in high sensitivity region |
| CN112415443A (en) * | 2020-10-14 | 2021-02-26 | 杭州电子科技大学 | System for enhancing low-band magnetic field detection performance by mechanical mode resonance frequency band |
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- 2021-08-30 CN CN202111003930.9A patent/CN113655414B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1678133A (en) * | 2004-03-31 | 2005-10-05 | 三洋电机株式会社 | Transmitting apparatus, sound sensor and autonomous traveling vehicle |
| CN101051030A (en) * | 2006-04-04 | 2007-10-10 | 株式会社东芝 | Magnetic resonance imaging apparatus and imaging condition enactment method for the same |
| CN110412486A (en) * | 2019-07-10 | 2019-11-05 | 杭州电子科技大学 | Optical Hollow Lumen Magnetic Field Sensing System with Optimum Sensitivity Frequency and Position Tunable |
| CN111580024A (en) * | 2020-04-30 | 2020-08-25 | 杭州电子科技大学 | An optical resonant magnetic field sensor with wide frequency band in high sensitivity region |
| CN112415443A (en) * | 2020-10-14 | 2021-02-26 | 杭州电子科技大学 | System for enhancing low-band magnetic field detection performance by mechanical mode resonance frequency band |
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