CN205808544U - A kind of fibre optic hydrophone acceleration sensitivity test system - Google Patents
A kind of fibre optic hydrophone acceleration sensitivity test system Download PDFInfo
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- CN205808544U CN205808544U CN201620525881.3U CN201620525881U CN205808544U CN 205808544 U CN205808544 U CN 205808544U CN 201620525881 U CN201620525881 U CN 201620525881U CN 205808544 U CN205808544 U CN 205808544U
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Abstract
A kind of fibre optic hydrophone acceleration sensitivity test system, including vibration module, signal modulation module, signal acquisition module and rear end demodulation module；Vibration module includes vibration table and the rigid container filling with liquid being arranged on vibration table；Testing fiber hydrophone and standard accelerometer are positioned in rigid container；Signal modulation module includes signal generator, light source and power amplifier；Signal generator exports modulated signal to light source, to vibration table output drive signal；Power amplifier exports the pumping signal to vibration table for amplifying signal generator；Signal acquisition module includes data acquisition card, charge amplifier and photoelectric conversion plate；The outfan of testing fiber hydrophone is connected with the first input end of data acquisition card through photoelectric conversion plate；The outfan of standard accelerometer is connected with the second input of data acquisition card through charge amplifier；The outfan of data acquisition card is connected with rear end demodulation module.This utility model simple in construction, measurement result is accurately and reliably.
Description
Technical field
This utility model relates to a kind of fibre optic hydrophone acceleration sensitivity test system.
Background technology
Fibre optic hydrophone has electromagnetism interference, and volume is little, lightweight, spatial resolution advantages of higher.It is easily achieved light
Fine transmission and remote remote measurement, it is easy to constitute Sensor Network and realize the measurement to multiple spot many reference amounts.Pull linear battle array optical fiber water to listen
Device requires have antivibration, anti-acceleration, the ability of self interference anti-, in order to improve signal to noise ratio and detectivity.Naval vessel is in fortune
Disorder of internal organs makes hydrophone produce acceleration, and this acceleration receives useful signal to hydrophone and generation disturbed.So-called anti-acceleration
Degree, it is simply that making hydrophone only sensitive and insensitive to acceleration signal to sound pressure signal, this is also as towed sonar in modern age
The new important indicator developed and propose.
Therefore, it is necessary to design one can accurately measure fibre optic hydrophone acceleration sensitivity test system.
Utility model content
This utility model is solved the technical problem that to be, for the deficiencies in the prior art, it is provided that a kind of fibre optic hydrophone adds
Velocity sensitivity test system, simple in construction, result is accurately and reliably.
The technical scheme that this utility model is used is:
A kind of fibre optic hydrophone acceleration sensitivity test system, including vibration module, signal modulation module, signals collecting
Module and rear end demodulation module；
Vibration module includes vibration table and the rigid container filling with liquid being arranged on vibration table；
Testing fiber hydrophone and standard accelerometer are positioned in rigid container, are allowed to be in same acceleration field；
Described signal modulation module includes signal generator, light source and power amplifier；
First outfan of signal generator is connected with the modulation of source signal input part of light source, and the light that light source sends passes through
Optical fiber exports testing fiber hydrophone；Second outfan of signal generator is through the pumping signal of power amplifier Yu vibration table
Input is connected；Power amplifier exports the pumping signal to vibration table for amplifying signal generator；
Described signal acquisition module includes data acquisition card, charge amplifier and photoelectric conversion plate；
The outfan of described testing fiber hydrophone is connected with the first input end of data acquisition card through photoelectric conversion plate；
The outfan of described standard accelerometer is connected with the second input of data acquisition card through charge amplifier；Electric charge
Amplifier is for amplifying the magnitude of voltage that standard accelerometer is measured.
The outfan of data acquisition card is connected with rear end demodulation module.
Described rear end demodulation module is provided with PGC demodulation module；PGC demodulation module include a doubler, varactor doubler,
One frequency mixer, the second frequency mixer, the first low pass filter, the second low pass filter, the first differentiator, the second differentiator, first
Multiplier, the second multiplier, subtractor, integrator and high pass filter；
The input of one doubler and doubler all accesses modulation of source signal；
Two inputs of the first frequency mixer connect outfan and the interference signal of a doubler respectively；
Two inputs of the first frequency mixer connect outfan and the interference signal of varactor doubler respectively；
The outfan of the first frequency mixer meets of the first multiplier successively through the first low pass filter and the first differentiator
Input；The outfan of another input termination the second low pass filter of the first multiplier；
The outfan of the second frequency mixer meets of the second multiplier successively through the second low pass filter and the second differentiator
Input；The outfan of another input termination the first low pass filter of the second multiplier；
The outfan of the first multiplier and the second multiplier connects two inputs of subtractor respectively；The outfan of subtractor
Connecing the input of integrator, the input of the output termination high pass filter of integrator, the outfan output of high pass filter solves
Adjust result.
Being provided with comparator in the demodulation module of described rear end, the testing fiber water demodulated for comparing PGC demodulation module is listened
The output signal △ φ [i.e. testing fiber hydrophone acceleration corresponding phase value] of device, and the acceleration that data acquisition card collects
The output voltage V of metera, obtain the acceleration sensitivity of testing fiber hydrophone.
In the demodulation module of rear end, it is known that voltage sensibility M of standard accelerometera0, experiment records the defeated of accelerometer
Going out voltage is Va, the output signal simultaneously measuring testing fiber hydrophone is △ φ, then the acceleration of testing fiber hydrophone
Sensitivity is:
The PGC demodulation module, the comparator that are provided with in the demodulation module of rear end all use existing module to realize, this utility model
The innovation being not related on algorithm.
Being integrated with AD conversion unit and DA converting unit in described data acquisition card, described AD conversion unit is used for gathering defeated
Enter signal.
Described modulation of source signal is the modulated sinusoid signal of frequency stable.
Described vibration table pumping signal is different frequency, the pumping signal of different amplitude.
The fibre optic hydrophone that fibre optic hydrophone acceleration sensitivity is defined as being caused as acceleration movement by a direction is done
The ratio of interferometer two-arm phase contrast △ φ and the acceleration a in the direction, unit be rad/g, g be acceleration of gravity.Its mathematics
Expression formula is:
Or be expressed as acceleration sensitivity level with decibel and be:
M in formulaarIt it is acceleration sensitivity reference value Mar=1rad/g, g are acceleration of gravity.
Voltage sensibility M of known standard accelerometera0, it is V that experiment records the output voltage of accelerometera, survey simultaneously
The output signal measuring testing fiber hydrophone is △ φ, then the acceleration sensitivity of testing fiber hydrophone is:
Acceleration sensitivity level is:
Operation principle of the present utility model is:
Testing fiber hydrophone and standard accelerometer are placed in same hydraulically full rigid container, and are in same
One height.By the DA converting unit outfan of High-Speed Data Acquisition Board, export modulated signal to light source, swash to vibration table output
Encourage signal.Rigid container is vibrated under constant acceleration, and two sensors has identical acceleration.Testing fiber hydrophone
Interference signal through photoelectric conversion plate (by optical signal be converted to can be demodulated the signal of telecommunication), standard accelerometer signal through electricity
Lotus amplifier.Utilize high-speed collection card by two output signal collections to rear end demodulation module, carry out PGC demodulation, interference signal
With a frequency multiplication, two frequency multiplier mixer of modulated light source signal, low-pass filtering, differential multiplication cross, subtracting each other, integration eventually passes height
Logical, complete PGC demodulation, it is possible to well restore testing fiber hydrophone detectable signal, show that testing fiber hydrophone changes
Phase value and standard accelerometer magnitude of voltage.Testing fiber water can be drawn finally by the known quantity recorded and scale operation
Listen the acceleration sensitivity of device.
Beneficial effect:
This utility model can be efficiently applied to the test of testing fiber hydrophone acceleration sensitivity, simple in construction, measures
Result is accurate, stable, reliable.The sensitivity for acceleration signal of the testing fiber hydrophone can be demonstrated intuitively, for
The Performance Evaluation of testing fiber hydrophone has a very big significance with measurement.
High speed information capture card converts analog signals into the digital signal of rear end demodulation module identification, and then can carry out one
Serial instant demodulation process efficiently.Capture card high speed ADC gathers and ensure that the real-time of signal and integrity, and digital demodulation is protected
Precision and the accuracy of data are demonstrate,proved.
Accompanying drawing explanation
Fig. 1 is this utility model theory diagram.
Fig. 2 is signal modulation module composition frame chart.
Fig. 3 is signal acquisition module composition frame chart.
Fig. 4 is PGC demodulation module composition frame chart.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, this utility model is described in more detail.
The utility model discloses a kind of fibre optic hydrophone acceleration sensitivity test system, including vibration module, signal
Modulation module, signal acquisition module and rear end demodulation module, as shown in Figure 1；
Vibration module includes vibration table and the rigid container filling with liquid being arranged on vibration table；
Testing fiber hydrophone and standard accelerometer are positioned in rigid container, are allowed to be in same acceleration field；
Described signal modulation module includes signal generator, light source and power amplifier；As shown in Figure 2；
First outfan of signal generator is connected with the modulation of source signal input part of light source, and the light that light source sends passes through
Optical fiber exports testing fiber hydrophone；Second outfan of signal generator is through the pumping signal of power amplifier Yu vibration table
Input is connected；Power amplifier exports the pumping signal to vibration table for amplifying signal generator；
Described signal acquisition module includes data acquisition card, charge amplifier and photoelectric conversion plate；As shown in Figure 3；
The outfan of described testing fiber hydrophone is connected with the first input end of data acquisition card through photoelectric conversion plate；
The outfan of described standard accelerometer is connected with the second input of data acquisition card through charge amplifier；Electric charge
Amplifier is for amplifying the magnitude of voltage that standard accelerometer is measured.
The outfan of data acquisition card is connected with rear end demodulation module.
Described rear end demodulation module is provided with PGC demodulation module；PGC demodulation module include a doubler, varactor doubler,
One frequency mixer, the second frequency mixer, the first low pass filter, the second low pass filter, the first differentiator, the second differentiator, first
Multiplier, the second multiplier, subtractor, integrator and high pass filter；As shown in Figure 4；
The input of one doubler and doubler all accesses modulation of source signal；
Two inputs of the first frequency mixer connect outfan and the interference signal of a doubler respectively；
Two inputs of the first frequency mixer connect outfan and the interference signal of varactor doubler respectively；
The outfan of the first frequency mixer meets of the first multiplier successively through the first low pass filter and the first differentiator
Input；The outfan of another input termination the second low pass filter of the first multiplier；
The outfan of the second frequency mixer meets of the second multiplier successively through the second low pass filter and the second differentiator
Input；The outfan of another input termination the first low pass filter of the second multiplier；
The outfan of the first multiplier and the second multiplier connects two inputs of subtractor respectively；The outfan of subtractor
Connecing the input of integrator, the input of the output termination high pass filter of integrator, the outfan output of high pass filter solves
Adjust result.
Being provided with comparator in the demodulation module of described rear end, the testing fiber water demodulated for comparing PGC demodulation module is listened
The output signal △ φ of device, and the output voltage V of accelerometer that data acquisition card collectsa, obtain testing fiber hydrophone
Acceleration sensitivity.
In the demodulation module of rear end, it is known that voltage sensibility M of standard accelerometera0, experiment records the defeated of accelerometer
Going out voltage is Va, the output signal simultaneously measuring fibre optic hydrophone is △ φ, then the acceleration of testing fiber hydrophone is sensitive
Degree is:
Being integrated with AD conversion unit and DA converting unit in described data acquisition card, described AD conversion unit is used for gathering defeated
Enter signal.
Described modulation of source signal is the modulated sinusoid signal of frequency stable.
Described vibration table pumping signal is different frequency, the pumping signal of different amplitude.
Fibre optic hydrophone acceleration sensitivity method of testing is:
1, testing fiber hydrophone and standard accelerometer are together placed in hydraulically full rigid container, and guarantee two
Detector is in same level height.
2, by signal generator to the stable modulated sinusoid signal of source output frequency, and difference is applied to vibration table
Frequency, the pumping signal of different amplitude.
3, signal carries out PGC demodulation via in High-Speed Data Acquisition Board collection to rear end demodulation module, draws testing fiber
Hydrophone phase value.And calculate testing fiber hydrophone acceleration sensitivity by standard accelerometer magnitude of voltage.
Claims (3)
1. a fibre optic hydrophone acceleration sensitivity test system, it is characterised in that include vibration module, signal modulation mould
Block, signal acquisition module and rear end demodulation module；
Vibration module includes vibration table and the rigid container filling with liquid being arranged on vibration table；
Testing fiber hydrophone and standard accelerometer are positioned in rigid container；
Described signal modulation module includes signal generator, light source and power amplifier；
First outfan of signal generator is connected with the modulation of source signal input part of light source, and the light that light source sends passes through optical fiber
Output is to testing fiber hydrophone；Second outfan of signal generator is through the pumping signal input of power amplifier with vibration table
End is connected；Power amplifier exports the pumping signal to vibration table for amplifying signal generator；
Described signal acquisition module includes data acquisition card, charge amplifier and photoelectric conversion plate；
The outfan of described testing fiber hydrophone is connected with the first input end of data acquisition card through photoelectric conversion plate；
The outfan of described standard accelerometer is connected with the second input of data acquisition card through charge amplifier；
The outfan of data acquisition card is connected with rear end demodulation module.
Fibre optic hydrophone acceleration sensitivity the most according to claim 1 test system, it is characterised in that described rear end solves
Mode transfer block is provided with PGC demodulation module；PGC demodulation module includes a doubler, varactor doubler, the first frequency mixer, the second mixing
Device, the first low pass filter, the second low pass filter, the first differentiator, the second differentiator, the first multiplier, the second multiplier,
Subtractor, integrator and high pass filter；
The input of one doubler and doubler all accesses modulation of source signal；
Two inputs of the first frequency mixer connect outfan and the interference signal of a doubler respectively；
Two inputs of the first frequency mixer connect outfan and the interference signal of varactor doubler respectively；
The outfan of the first frequency mixer connects an input of the first multiplier successively through the first low pass filter and the first differentiator
End；The outfan of another input termination the second low pass filter of the first multiplier；
The outfan of the second frequency mixer connects an input of the second multiplier successively through the second low pass filter and the second differentiator
End；The outfan of another input termination the first low pass filter of the second multiplier；
The outfan of the first multiplier and the second multiplier connects two inputs of subtractor respectively；The output termination of subtractor is long-pending
Dividing the input of device, the input of the output termination high pass filter of integrator, the outfan output demodulation of high pass filter is tied
Really.
Fibre optic hydrophone acceleration sensitivity the most according to claim 2 test system, it is characterised in that described rear end solves
Mode transfer block is provided with comparator, for comparing the output signal Δ φ of the testing fiber hydrophone that PGC demodulation module demodulates, and
The output voltage V of the accelerometer that data acquisition card collectsa, obtain the acceleration sensitivity of testing fiber hydrophone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620525881.3U CN205808544U (en) | 2016-06-02 | 2016-06-02 | A kind of fibre optic hydrophone acceleration sensitivity test system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620525881.3U CN205808544U (en) | 2016-06-02 | 2016-06-02 | A kind of fibre optic hydrophone acceleration sensitivity test system |
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| CN205808544U true CN205808544U (en) | 2016-12-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201620525881.3U Expired - Fee Related CN205808544U (en) | 2016-06-02 | 2016-06-02 | A kind of fibre optic hydrophone acceleration sensitivity test system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107104740A (en) * | 2017-01-16 | 2017-08-29 | 中国科学院声学研究所 | A kind of signal processing method and system |
| CN113466492A (en) * | 2021-06-11 | 2021-10-01 | 华中科技大学 | Device and method for measuring sensitivity of magnetic vector of accelerometer model parameter |
-
2016
- 2016-06-02 CN CN201620525881.3U patent/CN205808544U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107104740A (en) * | 2017-01-16 | 2017-08-29 | 中国科学院声学研究所 | A kind of signal processing method and system |
| CN113466492A (en) * | 2021-06-11 | 2021-10-01 | 华中科技大学 | Device and method for measuring sensitivity of magnetic vector of accelerometer model parameter |
| CN113466492B (en) * | 2021-06-11 | 2022-07-19 | 华中科技大学 | Device and method for measuring accelerometer model parameter magnetic vector sensitivity |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 410100 5 East three road, Changsha Economic Development Zone, Hunan Co-patentee after: Hunan the Great Wall Hai Dun Optical Fiber Technology Co., Ltd. Patentee after: Changsha HCC HIDEN Technology Co., Ltd. Address before: 410100 5 East three road, Changsha Economic Development Zone, Hunan Co-patentee before: Hunan Haidun Optical Fiber Sensing Technology Engineering Laboratory Co., Ltd. Patentee before: Changsha HCC HIDEN Technology Co., Ltd. |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190423 Address after: 410100 Zhongdian Software Building A076, 39 Jianshan Road, Changsha High-tech Development Zone, Hunan Province Patentee after: Hunan the Great Wall Hai Dun Optical Fiber Technology Co., Ltd. Address before: 410100 5 East three road, Changsha Economic Development Zone, Hunan Co-patentee before: Hunan the Great Wall Hai Dun Optical Fiber Technology Co., Ltd. Patentee before: Changsha HCC HIDEN Technology Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161214 Termination date: 20190602 |