CN201680925U - Fluorescence optical fiber temperature sensor based on fluorescence life detection - Google Patents
Fluorescence optical fiber temperature sensor based on fluorescence life detection Download PDFInfo
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- CN201680925U CN201680925U CN2010201934932U CN201020193493U CN201680925U CN 201680925 U CN201680925 U CN 201680925U CN 2010201934932 U CN2010201934932 U CN 2010201934932U CN 201020193493 U CN201020193493 U CN 201020193493U CN 201680925 U CN201680925 U CN 201680925U
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- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The utility model aims at providing a fluorescence optical fiber temperature sensor based on fluorescence life-span detects to solve in the background art traditional optical fiber temperature sensor structure more complicated, measurement accuracy is lower, the strong variation of photic intensity influences big scheduling problem. The fluorescent optical fiber temperature sensor comprises a light source driving circuit, a fluorescent excitation light source, a light path coupling system, a fluorescent optical fiber temperature measuring probe, a fluorescent signal detection processing system and a display system; the fluorescent optical fiber temperature measuring probe consists of a light transmitting optical fiber, a fluorescent material and a protective sleeve, wherein the fluorescent material is adhered to the tail end of the light transmitting optical fiber by epoxy glue, and the fluorescent material and the light transmitting optical fiber are completely wrapped by the protective sleeve as a whole. The utility model has the advantages of simple structure, small volume, light weight, high measurement accuracy, large measurement range, corrosion resistance, strong anti-electromagnetic interference capability and the like.
Description
Technical field
The utility model relates to a kind of fluorescent optical fiber temperature sensor that detects based on fluorescence lifetime, belongs to technical field of optical fiber sensing.
Background technology
Existing optical fiber temperature-measurement technology mainly realizes based on principles such as light reflection, light absorption, the interference of light, light scattering, heat radiations, wherein, based on the fiber-optical grating temperature sensor of light reflection principle realization and the optical Fiber Method pool temperature sensor of interference of light principle realization, all be based on wavelength variations and demodulate temperature information, the optical fiber (FBG) demodulator is made complicated, to used discrete device performance requirement height, the manufacturing cost height, and originally the experience influence of other factorses such as stress of its sensor is also very big, and needing the compensation technique of more complicated just can obtain can practical temperature information; Based on the thermometry of fiber raman scattering, combine technology such as OTDR especially, technical difficulty is bigger, and cost is higher; Based on the heat radiation technology, be applicable to high temperature (more than 1000 ℃) non-cpntact measurement, present technology maturation, cost is low, but application is limited, and market is less; Based on the optic fiber thermometer of light absorption techniques, measuring error is too big, and measurement reproducibility is poor, is subjected to the light intensity variable effect big, is difficult to practicality.
The utility model content
The utility model aims to provide a kind of fluorescent optical fiber temperature sensor that detects based on fluorescence lifetime, and the traditional fiber arrangement of temperature sensor described in the background technology is complicated, measuring accuracy is lower to solve, be subjected to problems such as the light intensity variable effect is big.
The material behavior of rare-earth fluorescent material of being based on temperature-measurement principle of the present utility model realizes, after some rare-earth fluorescent material is subjected to the ultraviolet ray irradiation and excites, launches line-spectra in visible spectrum, i.e. fluorescence and twilight sunset thereof (twilight sunset is excitation luminous after stopping).The fall time constant of phosphorescence afterglow is the single-valued function of temperature, and typical temperature is high more, and time constant is more little.As long as record the value of time constant, just can obtain temperature.Use the great advantage of this method thermometric, it is exactly the time constant that dut temperature only depends on fluorescent material, and it is irrelevant with its dependent variable of system, for example variation of the variation of the intensity of light source, transfer efficiency, degree of coupling etc. does not influence measurement result, than having a clear superiority on light intensity thermometry and the Wavelength demodulation method principle.
The fluorescent optical fiber temperature sensor that the utility model proposes based on the fluorescence lifetime detection, comprise light source driving circuit, fluorescence excitation light source, light path coupled system, fluorescence optical fiber temperature probe, fluorescence signal detecting processing system and display system, wherein the light path coupled system comprises first coupled lens, second coupled lens, the 3rd coupled lens and filter plate; Described fluorescence excitation light source can produce pulsed light wave; Described light source driving circuit links to each other with the fluorescence excitation light source, on the emitting light path of fluorescence excitation light source formation, be disposed with first coupled lens, filter plate and second coupled lens, emitting light path rear at the second coupled lens place is provided with fibre-optical splice, and fibre-optical splice is connected with the fluorescence optical fiber temperature probe through optical fiber; On the fluorescence reflected light path that the fluorescence optical fiber temperature probe forms, be disposed with the filter plate of second coupled lens, the 3rd coupled lens and half-reflection and half-transmission, be provided with the fluorescent probe that belongs to the fluorescence signal detecting processing system at the fluorescence reflected light path rear at the 3rd coupled lens place; Display system is electrically connected with the fluorescence signal detecting processing system.
The filter plate of above-mentioned half-reflection and half-transmission can be the light wave total reflection of 300～500nm to wavelength, is 500～700 light wave total transmissivity to wavelength.Coupled lens in the light path coupled system can adopt non-spherical lens, globe lens, GRIN Lens or plastic lens, structural member is realized the fixing of filter plate and coupled lens, more need to realize the accurate location of light path Coupling Design requirement, in general filter plate is the miter angle placement on light path, makes second coupled lens and the 3rd coupled lens be arranged in parallel on same axis.
Above-mentioned fluorescence optical fiber temperature probe is formed by passing light optical fiber, fluorescent material and protective sleeve, and fluorescent material is adhered to the end that passes light optical fiber with epoxy glue, and fluorescent material and biography light optical fiber are wrapped in the protective sleeve as a whole.
Above-mentioned biography light optical fiber adopts silica fibre, many components glass optical fiber or plastic optical fiber, and fluorescent material adopts rare-earth trichromatic fluorescent powder, gadolinium oxysulfide terbium or fluogermanic acid magnesium; Protective sleeve adopts high temperature resistant polytetrafluoroethylmaterial material to make, and is coated with silicone resin on the distal end faces of described biography light optical fiber, to improve reflectivity, makes more exciting light turn back to optical fiber.
It is light emitting diode, laser diode or the low pressure mercury lamp of 350～420nm that wavelength is adopted in above-mentioned fluorescence excitation light source.This light emitting diode has little, the little power consumption of light source volume, and the life-span is long, and the light that the while light source sends is easy to advantages such as optical fiber coupling.
Above-mentioned fluorescent probe is a photodiode, and described fluorescence signal detecting processing system also comprises signal amplification circuit, pulse shaping circuit, low-pass filter circuit, is with analog-to-digital single-chip microcomputer, clock circuit.Accept the fluorescence signal that the fluorescence optical fiber temperature probe produces by photodiode, realize opto-electronic conversion, signal amplification circuit carries out this electric signal processing such as processing and amplifying, shaping pulse, filtering, obtains the voltage pulse signal corresponding with the fluorescence decay signal.This potential pulse is passed to single-chip microcomputer, carries out analog to digital conversion, and unison counter picks up counting, and when finding that voltage pulse signal is lower than predetermined voltage, counting stops.Thereby extrapolate fluorescence decay time by the time that counter begins to stop.
Above-mentioned display system is made up of LCDs or photodiode display screen or other digitron display screen, display process circuit, shows probe temperature in real time.
Above-mentioned fluorescence signal detecting processing system and light source driving circuit communicate to connect, and can detect result according to fluorescence signal in the process of measuring in real time the parameter of exciting light source is controlled, and as width modulation etc., thereby temperature detection are continued to optimize.
Above-mentioned light source driving circuit is produced the periodicity electric pulse and is come the driving LED light source by Single-chip Controlling, makes it produce corresponding driving pulse light wave.
Advantage of the present utility model comprises:
The structural design advantages of simple of sensor, low cost of manufacture;
Measurement range is big, can realize the measurement of temperature-50～350 ℃ temperature range, the measuring accuracy height, can realize precision be higher than ± 0.5 ℃;
The temperature probe size is little, pliability is good, high temperature resistant, can realize probe diameter 0.2mm～3mm, the bending radius minimum is below 5mm, temperature probe can exchange, do not need after temperature probe is replaced to proofread and correct, temperature probe does not have metal material, has electrical insulating property completely, be not subjected to the influence of high pressure, strong-electromagnetic field, resist chemical and pollution-free;
Under the thermal cycle that repeats, the material and the structure of sensor are highly stable;
The performance of sensor is insensitive to the variation of light signal strength, long service life;
Can adopt the metering system of contact, also can adopt contactless metering system, but and long-distance transmissions, make the photoelectric device of sensor break away from the thermometric scene, avoided rugged environment.
Be not limited only to the orientation survey of body surface, its probe can also insert in the solid matter, immerse in the liquid or in the introducing equipment, arrives the specific region.
The utility model is particularly useful for that the hot(test)-spot temperature of the temperature monitoring, power transformer monitoring temperature, the temperature survey of primary cut-out arc-chutes of high voltage component, big motor stator, bearing shell, the monitoring of end collector ring equitemperature, big motor/transformer/high pressure equipment such as mutual inductor winding is directly monitored, the hydraulic generator stator winding temperature is measured, the electrical equipment temperature online is monitored in real time; The temperature survey of chemical process such as high corrosion environment or electrochemical treatment process, the safe thermometric under the carry out microwave radiation heating situation; Temperature survey in biological and medical domain such as the surgical procedure, the research of physiological reaction etc. under the electromagnetic radiation.
Description of drawings
The fibre optic temperature sensor that the fluorescence lifetime that is based on Fig. 1 detects is formed synoptic diagram.
Fig. 2 is a kind of fluorescence optical fiber temperature probe structural representation.
Drawing reference numeral explanation: 1-fluorescence optical fiber temperature probe, 2-optical fiber, 3-light path coupled system; the 4-light source driving circuit, 5-fluorescence signal detection circuit, 6-signal demodulation process system; the 7-display system, 11-fluorescent material, 12-protective sleeve; the 31-fibre-optical splice, 32-second coupled lens, 33-filter plate; 34-first coupled lens; 35-fluorescence excitation light source, 36-the 3rd coupled lens, 37-detector.
Embodiment
As shown in Figure 1, a kind of fluorescent optical fiber temperature sensor that detects based on fluorescence lifetime comprises light source driving circuit 4, light path coupled system 3, optical fiber 2, fluorescence optical fiber temperature probe 1, fluorescence signal detection circuit 5 and signal demodulation process system 6 and display system 7 etc.Light source driving circuit 4 links to each other with fluorescence excitation light source 35, produces pulse fluorescence excitation light source by fluorescence excitation light source 35, and fluorescence excitation light source 35 selects for use the purple ultra-high brightness LED as exciting light source, wavelength 400～410nm, and working current is in 200mA.Exciting light source 35 can also can be laser diode (LD) or low pressure mercury lamp etc.The light that this exciting light source sends reflexes to second coupled lens 32 through first coupled lens 34 and filter plate 33, focuses on coupling by second coupled lens 32.Exciting light after the coupling will couple light in the optical fiber 2 by fibre-optical splice 31 again, and the termination of optical fiber 2 is a fluorescence optical fiber temperature probe 1.The fluorescence excitation light source is under the effect of fluorescence optical fiber temperature probe 1, and (wavelength is approximately 630～670nm) and also passes light path coupled system 3 back by optical fiber 2 after the reflection generation fluorescence at this moment, is coupled to detector 37 by the 3rd coupled lens 36 again through behind the filter plate 33.Detector 37 is a photodiode, and it is corresponding with the photoluminescence peak wavelength that fluorescent probe is produced to survey peak wavelength, to improve detection sensitivity.Detector 37 changes into electric signal to the fluorescence light signal, carry out signal amplification, Filtering Processing by fluorescence signal detection circuit 5 again, carry out digital signal processing such as analog to digital conversion, signal demodulation again by signal demodulation process system 6, signal demodulation process system 6 outputting standard RSS232 rs 232 serial interface signals, offer display system 7, show in real time by display system 7 and measure temperature information; Can control light source driving circuit 4 simultaneously, with parameters such as the pulsewidth of regulating fluorescence excitation light source 35, amplitudes according to the data that signal demodulation process system 6 obtains.
As shown in Figure 2, fluorescence optical fiber temperature probe 1 is one of core of fibre optic temperature sensor, usually fluorescent material 11 is coated in the end face of optical fiber 2, fluorescent material 11 can adopt fluogermanic acid magnesium or other rare earth luminescent material, fluorescent material 11 usefulness epoxy glues are bonded on the end face that passes light optical fiber 2, the SC resin makes more exciting light turn back to optical fiber 2 to improve reflectivity again.Reach complicated outer jointing jacket 12 to increase physical strength and stability with optical cement simultaneously.
Claims (8)
1. fluorescent optical fiber temperature sensor that detects based on fluorescence lifetime, it is characterized in that: this fluorescent optical fiber temperature sensor comprises light source driving circuit, fluorescence excitation light source, light path coupled system, fluorescence optical fiber temperature probe, fluorescence signal detecting processing system and display system, and wherein the light path coupled system comprises the filter plate of first coupled lens, second coupled lens, the 3rd coupled lens and half-reflection and half-transmission; Described fluorescence excitation light source can produce pulsed light wave; Described light source driving circuit links to each other with the fluorescence excitation light source, on the emitting light path of fluorescence excitation light source formation, be disposed with first coupled lens, filter plate and second coupled lens, emitting light path rear at the second coupled lens place is provided with fibre-optical splice, and fibre-optical splice is connected with the fluorescence optical fiber temperature probe through optical fiber; On the fluorescence reflected light path that the fluorescence optical fiber temperature probe forms, be disposed with the filter plate of second coupled lens, the 3rd coupled lens and half-reflection and half-transmission, be provided with the fluorescent probe that belongs to the fluorescence signal detecting processing system at the fluorescence reflected light path rear at the 3rd coupled lens place; Display system is electrically connected with the fluorescence signal detecting processing system.
2. fluorescent optical fiber temperature sensor according to claim 1 is characterized in that: the filter plate of described half-reflection and half-transmission can be the light wave total reflection of 300～500nm to wavelength, is 500～700 light wave total transmissivity to wavelength.
3. fluorescent optical fiber temperature sensor according to claim 2; it is characterized in that: described fluorescence optical fiber temperature probe is formed by passing light optical fiber, fluorescent material and protective sleeve; fluorescent material is adhered to the end that passes light optical fiber with epoxy glue, and fluorescent material and biography light optical fiber are wrapped in the protective sleeve as a whole.
4. fluorescent optical fiber temperature sensor according to claim 3, it is characterized in that: described biography light optical fiber adopts silica fibre, many components glass optical fiber or plastic optical fiber, fluorescent material adopts rare-earth trichromatic fluorescent powder, gadolinium oxysulfide terbium or fluogermanic acid magnesium, and protective sleeve adopts high temperature resistant polytetrafluoroethylmaterial material to make; Be coated with silicone resin on the distal end faces of described biography light optical fiber.
5. according to the arbitrary described fluorescent optical fiber temperature sensor of claim 1 to 4, it is characterized in that: it is light emitting diode, laser diode or the low pressure mercury lamp of 350～420nm that wavelength is adopted in the fluorescence excitation light source.
6. fluorescent optical fiber temperature sensor according to claim 5, it is characterized in that: described fluorescent probe is a photodiode, and described fluorescence signal detecting processing system also comprises signal amplification circuit, pulse shaping circuit, low-pass filter circuit, is with analog-to-digital single-chip microcomputer, clock circuit.
7. fluorescent optical fiber temperature sensor according to claim 6 is characterized in that: described fluorescence signal detecting processing system and light source driving circuit communicate to connect.
8. fluorescent optical fiber temperature sensor according to claim 7 is characterized in that: described light source driving circuit is produced the periodicity electric pulse and is come the driving LED light source by Single-chip Controlling, makes it produce corresponding driving pulse light wave.
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Cited By (24)
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| CN102401703A (en) * | 2011-08-23 | 2012-04-04 | 北京东方锐择科技有限公司 | Microwave temperature measurement system based on fluorescence fiber temperature measurement |
| CN102435347A (en) * | 2011-11-15 | 2012-05-02 | 清华大学 | Method for real-time measurement of multipoint temperatures based on fluorescence optical fiber temperature sensor |
| CN102508090A (en) * | 2011-09-23 | 2012-06-20 | 中国兵器工业第二〇五研究所 | On-off automatic detection device for loops of collector ring |
| CN103134833A (en) * | 2013-01-30 | 2013-06-05 | 南京五石金传感技术有限公司 | Material heat conduction analysis device based on fluorescence method |
| CN103403515A (en) * | 2011-02-15 | 2013-11-20 | 维斯塔斯风力系统集团公司 | System and method for detecting damage to a wind turbine blade |
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- 2010-05-18 CN CN2010201934932U patent/CN201680925U/en not_active Expired - Lifetime
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