CN1043377C - Optical fiber sensing transient high-temperature measuring instrument - Google Patents
Optical fiber sensing transient high-temperature measuring instrument Download PDFInfo
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- CN1043377C CN1043377C CN 93117453 CN93117453A CN1043377C CN 1043377 C CN1043377 C CN 1043377C CN 93117453 CN93117453 CN 93117453 CN 93117453 A CN93117453 A CN 93117453A CN 1043377 C CN1043377 C CN 1043377C
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- Prior art keywords
- optical
- high pressure
- detector
- temperature
- pressure window
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- 239000013307 optical fiber Substances 0.000 title claims description 18
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Abstract
The device is applied to measuring dynamic temperature under an impact high pressure state (less than or equal to 400MPa), displays the highest temperature (less than or equal to 4000K), can draw the whole process curve at the beginning and the end of an explosion by means of a plotter, provides an important tool for scientific workers to search a physical equation under an impact load, and creates favorable conditions for various occasions such as the research on the characteristics of explosives and powders, the research on the temperature of a rocket wake jet flow field, the research on the temperature of an engine combustion chamber and the like.
Description
The invention belongs under the impulse high voltage state (≤400MPa) utilize the Fibre Optical Sensor mode to measure the device of dynamic temperature.This device adopts dual wavelength arrowband relative method based on Planck (Planck) law, corresponding output R=(λ
2/ λ 1)
5Exp[C
2/ T1/ λ
2-1/ λ
1)) only relevant with temperature T, C
2, λ
1, λ
12Be constant.
Adopt Fibre Optical Sensor to measure the device of impact temperature, known have six Channel Instantaneous Optical Pyrometer (" Chinese Journal Of High Pressure Physics ", Vol2, No3,277～284,1988), and this device is determined the temperature and the emissivity of grey body light source with integration measurement method.It needs the combination of multiple instrument, form huge experimental provision, this device can not show maximum temperature, can not bear the high pressure of 400MPa, this device has adopted six roots of sensation multimode optical fiber as six passages, six roots of sensation fiber bundle together, as No. six light-dividing devices, practice shows that error surpasses 20%, theoretically, because the repeatability of arrangement mode, faces parallel, connection coupling etc. cause changing slightly probe positions, repeatable accuracy is poor.I.e. six road light input, six road light output does not then definitely substitute the input of one road light, the light-dividing device of six road light output.
The objective of the invention is to propose a kind of new optical fibre sensor transient high temperature thermometer, make it to have ability 400MPa high pressure, can directly show maximum temperature, advantages such as volume is small and exquisite, easy to loading and unloading, rational in infrastructure, interchangeability is strong, precision is high, good reproducibility.
The invention is characterized in: it is made up of high pressure window and optical system, dual-wavelength optical-fiber temperature sensor, signal processing system three parts.Optical system includes school zero light source, object lens, Amici prism, graticule and eyepiece, the dual-wavelength optical-fiber temperature sensor is by the 1/4P GRIN Lens, its numerical aperture is 0.17～0.37, diameter is 0.8～2.5mm, and sensor fiber, Y type beam splitter, optical filter, detector moist closet, the simulation of quartzy fuse and the combination of silicone coating amplified and divider combines; Signal processing system by single-chip microcomputer, inside and outside triggering synchronous and correcting circuit, 0-10Vdc interface circuit,
Figure place shows circuit, power supply, microcomputer communication interface composition.
The present invention at first will solve high pressure resistant problem, because closed bomb vessel has the pressure tap of a φ 5mm, if sensing head directly is arranged in this hole, very easily damages after the ignition, therefore, needs to stop up this hole, makes bridge material can see through λ again
1And λ
2Ripple, what the present invention adopted is the secondary blouing ﹠ melting quartz.Because stishovite glass repeatedly, its surface is bombarded and cracked, and this is a fallible component, needs often to change.In order to make its ability 400MPa high pressure, during design it is made a cone, cone angle 2 α=18 °～24 °, this angle should be considered the desired visual field of object lens, consider that again pressure is as far as possible little, garden post lateral area is big as far as possible, makes pressure distribution on the side, for this reason, awl major part in garden is of a size of φ 6mm.Because the high pressure window is under repeatedly impacting, the stress that the side produces can be increasing, will inevitably cause the transmitance error that stress birefrin brings, for fear of this point, the present invention is divided into two sections with the quartz glass cone, depend on the into about 3mm of this section of major part thickness, doing disposable replacing uses, the about 12mm of back one segment length, doing sealed-for-life uses, so not only reduced cost, and the quartz crystal of 3～5mm thickness will cause the variation of light velocity penetration speed with the difference of surge pressure, thereby reach the purpose of thermometric and pressure measurement.The two train wave λ that penetrate from the closed bomb vessel width of cloth
1And λ
2To the GRIN Lens end face,, carry out opto-electronic conversion respectively after entering interference filter through the high pressure window by being divided into two-way behind the optic fibre guide, electric signal enters the ratio circuit, sends into storer by the single-chip microcomputer correction, and is clear after transient process is finished, with optical cable connector portion and signal processing, installation promptly finishes.The present invention adopts standard sources school zero, is because the distance difference that optical cable is arranged is eliminated the added losses that cause therefrom on the one hand; On the other hand, when using continuously, high pressure window front end face is contaminated, eliminates the transmitance that causes therefrom and reduces error.This device can be united use with multiple instruments such as instantaneous state recorder, microcomputer, plotting apparatus, frequency of signal generators, but and internal trigger is synchronous, external trigger is synchronous.Components and parts of the present invention select to be based upon λ
1, λ
2Wavelength determine, and then have or not the peak wavelength 0.9 μ m of absorption peak, detector (photoelectric commutator) to consider from thermal source scope 1500-4000K, optical fiber window, for this reason, determine λ
1Be between 0.82～0.93 μ m; λ
2Be between 0.5～0.53 μ m.The scaling method that the present invention adopts is: 1000-3000K calibrates with blackbody furnace, and 3000-4000K is extended by calibration curve, least square fitting.
The present invention adopts dual wavelength arrowband relative method, and some disturbing factors such as influences such as transmitance, surface contamination are cancelled out each other, and reaching does not influence the purpose that output power changes.This arrowband relative method further improves instrumental sensitivity, resolution, is the comparatively practical method of detection of dynamic.The present invention adopts the full-optical fiber optical formula, and promptly sensor head does not have the electronic devices and components relevant with input signal, has improved anti-electromagnetic interference capability, can online detection under high-frequency electric field, magnetic field.This device adopts GRIN Lens to be connected with optical fiber, has improved the stability of signal output.Because radiation light-wave focuses on the lens front end face of 1/4P, constitute a telescopic system, increased distance coefficient.The present invention has also adopted the mixing cable, and promptly optical cable and cable coexist in the cable.And the optical fiber core diameter reaches 400 μ m, and the silicone coating is made covering, and the light signal higher mode is decayed rapidly, as adds a distributed smooth hurdle, makes device stability improve good reproducibility.The present invention also adopts the two photosurface detectors of compound interference optical filter and same substrate, makes the temperature phenomenon of wafing controlled.Make device stability improve good reproducibility.The present invention also adopts the two photosurface detectors of compound interference optical filter and same substrate, makes the temperature phenomenon of wafing controlled.
Figure one is the designed optical fibre sensor transient high temperature thermometer structured flowchart of the present invention.
In figure one, 1 is airtight detonation device, and this device is made by special steel material, and an end has portfire, and the other end is the luminous energy transmitting aperture, and the copper washer sealing is all adopted at two ends, and it is above air tight to require pressure to reach 400MPa; 2 is the high pressure window; 3 are school small incidental expenses standard sources; 4 is object lens, its focal distance f=50mm, and the adjusting object lens can be observed the little end surface of high pressure window and are imaged on the graticule, and 5 is Amici prism; 6 is graticule; 7 is eyepiece; 8 is GRIN Lens, from two train wave λ of airtight detonation device
1, λ
2Be focused on the GRIN Lens through the high pressure window, these lens and object lens constitute a telescopic system; 9 is composite cable, and plain conductor and optical fiber are composed a cable, and length can be decided according to the installation site, optical cable transmitting optical signal wherein, and plain conductor is a kind of multiply flexible cord, and it is connected with standard sources, and its effect is school zero; 10 is Y type beam splitter; 11 is optical filter; 12 is the detector moist closet, is made in the box 10,11,12, replaces Y type beam splitters with two photosurface PIN high-speed response detectors, λ
1, λ
2Make the composite filter sheet, respectively account for 50% denomination, half-band width 120A～200A, be in the constant temperature enclosure, the greenhouse heater element is 4 of the resistance of 2W, and temperature-sensing element (device) is AD590, when preheating makes the greenhouse be higher than environment temperature to reach 50 ℃ before using, AD590 sends a signal, cuts off heating resistor automatically, has stablized received signal like this; 13 are simulation amplification and divider; 14 is Single Chip Microcomputer (SCM) system, and the present invention adopts 51 series, and matches with high-speed a/d, and general mould/number conversion is adopted more than 10; 15 is inside and outside triggering synchronous and correcting circuit; 16 is the 0-10Vdc interface circuit; 17 are
Figure place shows circuit; 18 is power supply; 19 is the microcomputer communication interface.
Claims (4)
1. optical fibre sensor transient high temperature thermometer, form by the airtight detonation device, optical system, dual-wavelength optical-fiber temperature sensor, the signal processing system that have the high pressure window, it is characterized in that, described high pressure window is a cone, cone angle 2 α=18 °～24 ° adopt the secondary blouing ﹠ melting quartz to make; The structure of described optical system is, light can be by the eyepiece observation that is provided with thereafter by pressing the window end face to divide two the tunnel, the one tunnel high pressure window end face imaged in graticule by regulating object lens through Amici prism light; Another road is connected to the dual-wavelength optical-fiber temperature sensor, and is outside equipped with school small incidental expenses standard sources at the optical axis of object lens front end, makes it to shine in high pressure window end face; The structure of described dual-wavelength optical-fiber temperature sensor is, object lens constitute a telescopic system in the 1/4P of sensor front end setting GRIN Lens and optical system, make the radiated wave in the airtight detonation device converge at GRIN Lens, optical fiber cable by coupling is transferred to Y type beam splitter, light divide two the tunnel after filtration mating plate two bundle light become λ
1And λ
2, λ
1And λ
2Enter the detector moist closet respectively and convert electric signal to, amplify with the divider processing by simulation again signal is defeated by signal processing system by detector.
2. measuring instrument according to claim 1 is characterized in that, described cone high pressure window is two sections, and one section of close major part is replaceable body.
3. measuring instrument according to claim 2, it is characterized in that, Y type beam splitter, optical filter, detector moist closet can be made of one, be to replace Y type beam splitter with two photosurface PIN detectors, two optical filters are made a composite filter sheet, its correspondence is affixed on two photosurfaces of detector and realizes.
4. according to claim 1 or 2 or 3 described measuring instruments, it is characterized in that the wavelength X that described optical filter can pass through
1Be 0.82～0.93 μ m, λ
2Be 0.5～0.53 μ m; Described optical fiber cable is a composite cable, is provided with plain conductor therein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93117453 CN1043377C (en) | 1993-09-09 | 1993-09-09 | Optical fiber sensing transient high-temperature measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93117453 CN1043377C (en) | 1993-09-09 | 1993-09-09 | Optical fiber sensing transient high-temperature measuring instrument |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1084965A CN1084965A (en) | 1994-04-06 |
| CN1043377C true CN1043377C (en) | 1999-05-12 |
Family
ID=4992010
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93117453 Expired - Fee Related CN1043377C (en) | 1993-09-09 | 1993-09-09 | Optical fiber sensing transient high-temperature measuring instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1043377C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8432440B2 (en) * | 2009-02-27 | 2013-04-30 | General Electric Company | System and method for adjusting engine parameters based on flame visualization |
| CN101915618A (en) * | 2010-07-20 | 2010-12-15 | 南昌航空大学 | Device and method for calibrating emissivity of high-temperature fuel gas |
-
1993
- 1993-09-09 CN CN 93117453 patent/CN1043377C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1084965A (en) | 1994-04-06 |
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