CN102156016B - Fast-response passive silica optical fiber pressure sensor measurement system for shock wave test - Google Patents
Fast-response passive silica optical fiber pressure sensor measurement system for shock wave test Download PDFInfo
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- CN102156016B CN102156016B CN 201110056186 CN201110056186A CN102156016B CN 102156016 B CN102156016 B CN 102156016B CN 201110056186 CN201110056186 CN 201110056186 CN 201110056186 A CN201110056186 A CN 201110056186A CN 102156016 B CN102156016 B CN 102156016B
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Abstract
The invention provides a fast-response passive silica optical fiber pressure sensor measurement system for a shock wave test. A silica optical fiber pressure sensor of the optical fiber pressure sensor measurement system is partially buried in a sample under test and sends a wide-spectrum optical pulse signal under the action of a shock wave, the optical pulse signal is transmitted to an interference filter through an optical fiber, wherein only the light with a specific wavelength enters a photoelectric conversion system, and the photoelectric conversion system converts the optical pulse to the electrical pulse and transmits the electrical pulse to a oscilloscope for recording. Because the amplitude of the electrical pulse signal has a specific relationship with the shock pressure of the sample under test and the relationship can be calibrated, the shock pressure of the sample under the shock wave test and a curve of the shock pressure, which varies along with time, can be obtained according to the signal sent by the oscilloscope. The silica optical fiber pressure sensor measurement system is suitable for the 30-200GPa shock pressure measurement, can be applied to the filed of the study on the high-pressure physical properties of materials and has wide application prospects in the field of the study on the shock wave physics, the detonation physics, the fluid dynamics and the like.
Description
Technical field
The invention belongs to surge test measurement mechanism technical field, be specifically related to a kind of fast-response passive silica optical fiber pressure sensor measurement system for surge test.
Background technology
Existing surge pressure sensor has manganin gauge and PVDF film, LiNbO
2, piezoelectric sensor and the Active Optical Fiber pressure transducer such as quartz crystal.The manometric higher limit of copper-manganese can only arrive about 20ns at 50GPa and time response the soonest; Quartz crystal, LiNbO
2Though have faster response Deng piezoelectric sensor, when 3GPa～4GPa, to undergo phase transition, limited its usable range; The PVDF piezometer generally be used in 2GPa following fields of measurement; It is Microsecond grade the soonest that the Active Optical Fiber pressure transducer can only be used for following pressure survey and the response time of 0.5GPa, can not satisfy the requirement of surge test.Also there is not at present direct measuring method for the above surge pressure of 50GPa.
American Roeske.F has reported that in 1994 a kind of silica fibre that utilized produces the fast-response optical fiber probe technology of the characteristic work of optical radiation under percussive action, this probe response time is exceedingly fast, can reach subnanosecond, accurately measuring shock waves is to the time of tat probe.But this probe can only be measured and impact the surge pressure that can not measure sample time of arrival.
Summary of the invention
Can't directly measure 50GPa with the deficiency of upward pressure in order to overcome existing pressure transducer, the invention provides the passive quartzy surge pressure sensor measuring system of a kind of fast-response for surge test, pressure sensor measurement system of the present invention not only can be measured 30GPa to the interior surge pressure of 200GPa scope, and the response time is in 10ns.
Fast-response passive silica optical fiber pressure sensor measurement system for surge test of the present invention comprises Fibre Optical Sensor and signal transmission unit, narrow band pass filter, photoelectric commutator, oscillograph.Wherein, an end of Fibre Optical Sensor is imbedded the shock wave that is used for the induction laboratory sample in the laboratory sample, and an other end of Fibre Optical Sensor is connected with an end of transmission unit, and its effect is that the signal that will measure is transferred to photoelectric commutator.Having parasitic light because shock wave and optical fiber interact, therefore, place narrow band pass filter between Transmission Fibers and photoelectric commutator, mainly is for the parasitic light beyond the filtered signal light, the flashlight that the system that extracts is required.One end of narrow band pass filter is connected with an end of transmission unit, and an other end is connected with photoelectric commutator one end, and the Main Function of photoelectric commutator is that the light signal that will measure is converted to electric signal.An other end of photoelectric commutator is connected with oscillograph, and oscillograph is mainly used in the shock wave signal and analyzes.
The core diameter that is used as the silica fibre of sensor described in the present invention is 50mm～300mm, the centre wavelength of described narrow band pass filter is that 532nm, passband halfwidth are 10nm, described photoelectric commutator adopts photomultiplier, the rise time of photomultiplier is 0.8ns, and spectral response range is 500nm～600nm.
Of the present inventionly need not to add light source for passive silica optical fiber pressure sensor measurement system, it is to utilize silica fibre itself as sensing element, it is imbedded testing sample inside, utilize silica fibre luminous characteristic work under shock wave, obtain the luminous intensity of silica fibre and the relation of surge pressure by demarcation, the signal that then provides by oscillograph just can obtain surge pressure and the time dependent curve thereof of sample in the surge test.
The present invention solves its technical matters like this: adopt the multimode silica fibre of core diameter 50m～300m as senser element, it is imbedded in the testing sample, silica fibre can provide the light pulse signal of a wide spectrum under shock wave, again by centre wavelength 532nm, the interference filter restriction of passband halfwidth 10nm enters the spectral range of photo-translating system, to improve system stability, utilize the photomultiplier of rise time 0.8ns that light pulse is converted to electric pulse, utilize oscillograph that this electric pulse is recorded, provide the relation of signal amplitude and testing sample surge pressure by calibration experiment, then just can obtain surge pressure and the time dependent curve thereof of sample by the electric impulse signal amplitude of oscillograph recording.
Adopt the present invention, can realize 30GPa to the stress measurement of 200GPa, have a response time short, disturb littlely, transmission medium is common silica fibre, can telemeasurement etc. advantage; Simultaneously the present invention only is made of Fibre Optical Sensor, transmission unit, narrow band pass filter, photoelectric commutator and oscillograph, and system architecture is simple, user's easy operating.
Fast-response passive silica optical fiber pressure sensor measurement system for surge test of the present invention has the response time and the very wide pressure measurement range that are exceedingly fast.The present invention is applicable to shock wave physics and hydromechanical research field.
Description of drawings
Fig. 1 fast-response passive silica optical fiber pressure sensor measurement system theory diagram for surge test of the present invention.
The signal amplitude that Fig. 2 fast-response passive silica optical fiber pressure sensor measurement system for surge test of the present invention obtains by calibration experiment and the relation curve of sample surge pressure.
Among the figure, 1. Fibre Optical Sensor 2. transmission units 3. narrow band pass filters 4. photoelectric commutators 5. oscillographs.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
As shown in Figure 1, an end of Fibre Optical Sensor 1 is imbedded the shock wave that is used for the induction laboratory sample in the laboratory sample, and an other end of Fibre Optical Sensor 1 is connected with an end of transmission unit 2, and its function is that the signal that will measure is transferred to photoelectric commutator 4.Because it mainly is for parasitic light being carried out filtering, extracting system's desired signal that shock wave and optical fiber interaction exist parasitic light, narrow band pass filter 3.One end of narrow band pass filter 3 is connected with an end of transmission unit 2, and an other end is connected with photoelectric commutator 4 one ends, and photoelectric commutator 4 Main Functions are that the light signal that will measure is converted to electric signal.An other end of photoelectric commutator 4 is connected with oscillograph 5, and the shock wave signal is analyzed.
The deficiency that has greatly improved conventional pressure sensor for the fast-response passive silica optical fiber pressure sensor measurement system of surge test of the present invention has not only improved the upper limit of gaging pressure, and the response time also greatly improves.
The present invention adopts silica fibre as signal transmission unit, has not only reduced system noise, has improved Signal-to-Noise, and has prolonged signal transmission distance.
The present invention adopts photomultiplier as photoelectric commutator, because this response device time is fast, and it is adjustable to gain, and therefore is the core devices in the system.
The oscillograph bandwidth 500MHz that the present invention adopts, sampling rate 1GSa/s, record length 10M, 4 passages.The core diameter that is used as the silica fibre of sensor described in the present invention is the arbitrary numerical value among 50mm～300mm; The centre wavelength of described narrow band pass filter is that 532nm, passband halfwidth are 10nm.The rise time of described photomultiplier is 0.8ns, and spectral response range is the arbitrary numerical value among 500nm～600nm.
Fig. 1 is principle of the invention figure.As can be seen from the figure, stress measurement when test, need to beat on the surface of testing sample the aperture that diameter and used optical fiber are complementary, will pack in the aperture as the silica fibre of sensor, and fix with glue.During test, the pulsed optical signals that Fibre Optical Sensor 1 provides is transferred in the narrow band pass filter 3 that passband is 532nm ± 5nm by the transmission unit 2 that the optical fiber with the Fibre Optical Sensor same model consists of, be input in the photomultiplier of rise time less than 1ns, the electric signal transmission that photomultiplier provides is to oscillograph 5 records of analog bandwidth 500MHz, sampling rate 1GSa/s again.The signal amplitude that provides in conjunction with Fig. 2 again and the relation curve of surge pressure just can calculate the sample strain of this test.
Claims (4)
1. fast-response passive silica optical fiber pressure sensor measurement system that is used for surge test is characterized in that: described passive silica optical fiber pressure sensor measurement system comprises Fibre Optical Sensor and signal transmission unit, narrow band pass filter, photoelectric commutator, oscillograph; Wherein adopt silica fibre itself as senser element; Described Fibre Optical Sensor is connected with transmission unit, be used for surveying shock wave pressure, the output terminal of transmission unit is connected with narrow band pass filter, an other end of narrow band pass filter is connected with photoelectric commutator, photoelectric commutator is converted to electric signal with the light signal of narrow band pass filter output, be used for the shock wave pressure signal and analyze, the output terminal of photoelectric commutator is connected with oscillograph, and oscillograph is used for gathering the output electrical signals of photoelectric commutator.
2. fast-response passive silica optical fiber pressure sensor measurement system according to claim 1, it is characterized in that: the core diameter of the silica fibre of described fast-response passive silica optical fiber is 50mm～300mm.
3. fast-response passive silica optical fiber pressure sensor measurement system according to claim 1, it is characterized in that: the centre wavelength of described narrow band pass filter is that 532nm, passband halfwidth are 10nm.
4. fast-response passive silica optical fiber pressure sensor measurement system according to claim 1 is characterized in that: described photoelectric commutator adopts photomultiplier, and the rise time of photomultiplier is 0.8ns, and spectral response range is 500nm～600nm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104864961A (en) * | 2015-05-15 | 2015-08-26 | 西北核技术研究所 | Multichannel pulse spectral measurement device and method based on fiber array |
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| CN102944696B (en) * | 2012-11-28 | 2014-04-02 | 中国工程物理研究院流体物理研究所 | Chirped fiber grating sensor and processing method |
| CN103411718B (en) * | 2013-08-12 | 2015-06-10 | 江苏大学 | Method for measuring shock pressure of flyer under high strain rate and device thereof |
| CN103900622A (en) * | 2014-04-04 | 2014-07-02 | 中国工程物理研究院流体物理研究所 | Photoelectric integrated probe |
| CN103983309B (en) * | 2014-06-06 | 2016-05-25 | 中国工程物理研究院流体物理研究所 | A kind of three-in-one photoelectric probe for impact and explosion experiment |
| CN111707566B (en) * | 2020-06-24 | 2023-07-07 | 太原理工大学 | Experimental system for researching dynamic response of structure under impact load and application method |
| CN113188696B (en) * | 2021-04-10 | 2023-03-17 | 西安交通大学 | Impact pressure testing device and method based on mechanoluminescence material |
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| 李春花等.光纤探针技术在冲击波参量测量中的应用.《光纤探针技术在冲击波参量测量中的应用》.2007,第44卷(第11期),第37页，第38页右栏,第39页、图1. * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104864961A (en) * | 2015-05-15 | 2015-08-26 | 西北核技术研究所 | Multichannel pulse spectral measurement device and method based on fiber array |
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