CN105258802A - Unstable environment transient-state temperature measuring device based on coarse and fine two-stage light splitting structure - Google Patents
Unstable environment transient-state temperature measuring device based on coarse and fine two-stage light splitting structure Download PDFInfo
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- CN105258802A CN105258802A CN201510735517.XA CN201510735517A CN105258802A CN 105258802 A CN105258802 A CN 105258802A CN 201510735517 A CN201510735517 A CN 201510735517A CN 105258802 A CN105258802 A CN 105258802A
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Abstract
The invention discloses an unstable environment transient-state temperature measuring device based on a coarse and fine two-stage light splitting structure. The temperature measuring device comprises a front optical mechanism, a conducting fiber, a light splitting mechanism and a signal acquiring and processing module. The front optical mechanism transmits a spectrum sent by a target to the light splitting mechanism via the conducting fiber. The light splitting mechanism separates, extracts and sends characteristic spectrum signals to the signal acquiring and processing module. The signal acquiring and processing module generates voltage signals corresponding to strength of the characteristic spectrum signals, and analyzes the voltage signals based on the excitation temperature algorithm mathematic model and the radiation temperature algorithm mathematic model so as to obtain the transient-state temperature of a to-be-measured object. According to the invention, the temperature measuring device is capable of extracting characteristic spectrums of various kinds of elements in a wide spectral region and precisely measures the temperature of the target in the unstable and harsh environment with strong electromagnetic radiation and vibration and rapid temperature change.
Description
Technical field
The invention belongs to optical precision field tests, be specifically related to a kind of non-steady environment transient temperature measuring apparatus based on thick smart secondary light-splitting structure.
Background technology
In many fields such as commercial production, therapeutic treatment, all relate to the detection of temperature, and temperature not keeps constant in many situations, it changes just in time rapidly on the contrary, temperature in this case and transient temperature.To the Real-Time Monitoring of transient temperature, it is the important means understanding internal system instantaneous operating conditions and various parametric interaction in time.
Current temperature survey is classified according to principle, can be divided into contact temperature-measuring and the large class of contactless temperature-measuring two.
Contact temperature-measuring method mainly the temperature-sensing element such as thermopair, optical fiber is directly placed in dut temperature field or medium carrys out measuring tempeature, and this method by the impact of the factor such as blackness, thermal physical property parameter of flame, does not have easy to use, the advantages such as economy and durability.But, burning etc. is had to the object of transient pulse characteristic, contact temperature-measuring method is difficult to the measurement means as real temperature field, main cause is that the dynamic perfromance of contact temperature-measuring device is not ideal enough, measurement has the regular hour delayed, is difficult to the Rapid Variable Design reflecting temperature in time, producing in measuring high temperature, high speed plasma, heat conduction is delayed, be difficult to the Rapid Variable Design reflecting temperature in time, supper-fast transient state thermometric requirement cannot be realized.
In contactless temperature-measuring method, spectroscopic methodology is the measuring radiation temperature method the most accurately and effectively of generally acknowledging at present, therefore the research of recent domestic concentrates on and to improve spectroscopic methodology thus temperature survey under adapting to varying environment, as the spectroscopic temperature measurement method based on laser technology and the spectroscopic temperature measurement method based on multichannel wavelength channel.Spectroscopic temperature measurement method based on laser technology comprises tunable diode laser absorption spectroscopy method, laser is correlated with anti-Stokes-raman scattering spectrum thermometry and the coherent imaging spectroscopic methodology etc. based on Doppler's spectroscopy.Tunable diode laser absorption spectroscopy method (TDLAS) is mainly divided into the direct absorption process of length scanning and wavelength-modulated absorption process.The direct absorption process of length scanning is by scanning selected Absorption Line, utilizes the absorption peak obtained to realize the measurement relevant to absorbing medium; Wavelength-modulated absorption process is the principle based on phase lock-in detecting, can effectively suppress other band noise on the impact of measuring.The major defect of TDLAS method thermometric is that measurement sensistivity is low, is subject to the interference of ground unrest, can not adapt to the requirement to temperature test under rugged surroundings.Laser anti-Stokes-raman scattering spectrum thermometry (CARS) of being correlated with is coherent Raman principle based on nonlinear optics four-wave mixing, it utilizes some gas produced in flame (as CO, NO etc.) absorbing laser some characteristic wavelength after can produce a kind of characteristic spectrum, by carrying out temperature survey to the extraction of this spectrum.But CARS method research is at present also the starting stage, and its accuracy measured still be can not determine, needs to be studied, therefore cannot meet the requirement of high precision measuring temperature.Coherent imaging spectrum ratio juris based on Doppler's spectroscopy is based on plasma light spectral line shape and with it mainly based on a pair Fourier pair as light source by the interference fringe obtained after interference system, at high temperature producing spectrum widening according to spectrum causes intetference-fit strengthening to decline this physical characteristics, thus recover survey the distribution situation of plasma temperature field.But the shortcoming of the method is, the anti-interference of the factor such as vibration, noise is very poor to external world, and the fluctuation of ambient temperature can make it introduce very large error, and therefore this method cannot adapt to the temperature survey under rugged surroundings equally.Spectroscopic temperature measurement method based on multichannel wavelength channel comprises duochrome method, tri-stimulus etc.Duochrome method is based on the thermal-radiating temp measuring method of solid, its measuring principle is the intensity of radiant light on certain two wavelength gone out by measuring flame emission, then two intensity utilizing radiology to set up and the equation of temperature, one, community represents the unknown factor of radiance, calculates desired temperature.Duochrome method, by the luminous intensity sense temperature of perception measuring object (as flame) self, realizes non-contact measurement, low to optical path requirements, and test is simple.But there are two defects in duochrome method: 1. pair characteristic spectrum location and extract resolution not high, two operating wavelength ranges extracted are wider, greatly affect measuring accuracy; 2. wavelength channel is few, only sets up two wavelength channels to extract two operation wavelengths, the intensity of introducing and the equation of temperature very few, digital simulation precision is too low, is difficult to ensure final measuring accuracy.The color image of the spectrum that tri-stimulus is given off by analysis to measure object obtains its temperature, concrete principle is: the spectrum that measuring object (as combustion flame) gives off has specific color, temperature corresponding to these colors has uniqueness, therefore only need to use method accurately to record the image with these colors, then these images are analyzed, just can obtain temperature and the distribution thereof of measuring object.Light path required for three-color method and optical element less, but when its work, the passage can propagated for thermal radiation optical spectrum must be provided, some severe factors of test environment, as the impact etc. of sootiness, burning ashes, this passage can be made to produce local pollution and cause transmissivity homogeneity to weaken, this reduces thermometric precision.
Except the above duochrome method, tri-stimulus, common spectroscopic temperature measurement method such as the people such as Zhai Yang based on multichannel wavelength channel propose " multispectral transient state thermo detector is used for power emission coefficient flame test " (volume the 4th phase in July, 2011 " applied optics " the 32nd).It discloses a kind of transient state temperature measuring equipment, i.e. multispectral transient state thermo detector, aim at the mark being used for and gather the preposition optical facilities of target optical spectrum signal, be integrated in one with the signal processing system obtaining temperature-measuring results for the treatment of characteristic spectrum signal for separating of the grating beam splitting mechanism extracting multichannel characteristic spectrum signal, the asymmetric C-T formula grating monochromator structure utilizing the spherical reflector of reflective blazed grating and two pieces of asymmetric arrangements to form is as spectrophotometric device, characteristic spectrum under multiple wavelength is extracted, input Computer Analysis after spectral signal process the most at last and obtain temperature test result.The shortcoming of this device is: the precision measurement preposition optical facilities and grating beam splitting mechanism, signal processing system of playing probe effect formed is partly integrated to be assembled together, when actual measurement, the attitude of each for the spectrophotometric device causing debuging in advance optical element, position change by the vibration that test site produces, the accurate extraction of effect characteristics spectrum; The unfavorable factor such as electromagnetic radiation, temperature variation of test site will cause interference to the photoelectric detector of signal processing system, make it can not work under a stable state, bring very large accidental error to measurement result.This device adopts conventional reflector formula blazed grating and two pieces of spherical mirrors to form C-T formula spectrophotometric device, shortcoming is: the diffraction efficiency of reflective blazed grating can only reach about 75%, inadequate to the capacity usage ratio of target optical spectrum, the characteristic spectrum signal that finally collects can be made too faint, increase the difficulty to its detection; In addition, due to utilizing spherical reflector to carry out to collimate, focus on time there is larger aberration, result in the disc of confusion size receiving each characteristic spectrum on target surface larger, if the wavelength of adjacent two characteristic spectrums is separated by nearer, the position of its disc of confusion also can be separated by very near accordingly, the situation that the disc of confusion that even there will be different characteristic spectrum overlaps, causes characteristic spectrum to be extracted.When the disc of confusion size of characteristic spectrum is larger, the fiber size being used for extracting characteristic spectrum signal must increase, and correspondingly extracted spectral bandwidth must increase, and so just causes the decline of spectral resolution.In addition, under the system architecture that this device is taked, when the spectral range of incident light is wide, after grating beam splitting, the angle between the light of short wavelength and the light of long wavelength can be very large, and the receiving plane size needed for such second piece of spherical reflector must be very large.The incident light that larger receiving plane size receives wide spectral range can be obtained in theory by the bore increasing by second piece of spherical mirror, but consider that heavy caliber spherical mirror carries out the actual difficulty and the cost that add man-hour, do feasibility so not high.Therefore the size for second piece of spherical mirror in spectrophotometric device limits, and this system architecture only can carry out separation and Extraction to the characteristic spectral line of some elements in narrower wavelength coverage, which limits the scope of its measuring object.
Summary of the invention
The object of the present invention is to provide a kind of non-steady environment transient temperature measuring apparatus based on thick smart secondary light-splitting structure, the characteristic spectrum signal of the object existed in the astable environment of the severe factors such as strong electromagnetic radiation, vibration, difference variation be fast is extracted, and then realizes the measurement to target transient temperature.
The technical solution realizing the object of the invention is: a kind of non-steady environment transient temperature measuring apparatus based on thick smart secondary light-splitting structure, comprise preposition optical facilities, conduction optical fiber, spectrophotometric device and Signal acquiring and processing module, conduction optical fiber one end is connected with preposition optical facilities, the other end is connected with spectrophotometric device, spectrophotometric device again with Signal acquiring and processing model calling;
Described preposition optical facilities comprise collimator objective, spectroscope and CCD, collimator objective and spectroscope is set gradually along optical axis, the spectrum of objective emission, after collimator objective is assembled, enters spectroscope, is divided into reflected light and transmitted light through spectroscope, reflected light enters CCD, the target surface of CCD is positioned at the focal plane place of collimator objective equivalently, and utilize it to observe easily when measuring and to aim at target at a distance, transmitted light enters one end of conduction optical fiber, from the injection of the conduction optical fiber other end, enter spectrophotometric device.
Described spectrophotometric device comprises the first Amici prism, the second Amici prism, the first binary raster, the second binary raster, the 3rd binary raster, the first off-axis parabolic mirror, the second off-axis parabolic mirror, the 3rd off-axis parabolic mirror, the 4th off-axis parabolic mirror, the 5th off-axis parabolic mirror, the 6th off-axis parabolic mirror, first receives target surface, the second reception target surface and the 3rd receives target surface, common optical axis sets gradually conduction optical fiber exit end, first Amici prism second Amici prism, from the light of conduction optical fiber exit end injection, different according to spectral coverage through the first Amici prism, be divided into infrared, first transmitted light of visible spectrum and the first reflected light of ultraviolet light spectral coverage, first reflected light injects the 3rd off-axis parabolic mirror, the second binary raster is injected after the 3rd off-axis parabolic mirror collimation, second binary raster injects the 4th off-axis parabolic mirror after being separated by the spectrum of different wave length, focus on through the 4th off-axis parabolic mirror, receive target surface by second and extract the characteristic spectrum signal after the 4th off-axis parabolic mirror focuses on, first transmitted light injects the second Amici prism, different according to spectral coverage through the second Amici prism, be divided into the second transmitted light of visible spectrum and the second reflected light of infrared light spectral coverage, second reflected light injects the 5th off-axis parabolic mirror, after the 5th off-axis parabolic mirror collimation, inject the 3rd binary raster, 3rd binary raster injects the 6th off-axis parabolic mirror after being separated by the spectrum of different wave length, focus on through the 6th off-axis parabolic mirror, the 3rd receives target surface extracts the characteristic spectrum signal focused on through the 6th off-axis parabolic mirror, second transmitted light injects the first off-axis parabolic mirror, after the first off-axis parabolic mirror collimation, inject the first binary raster, first binary raster injects the second off-axis parabolic mirror after being separated by the spectrum of different wave length, after the second off-axis parabolic mirror focuses on, first receives target surface extracts the characteristic spectrum signal focused on through the second off-axis parabolic mirror, first receive target surface, second receive target surface and the 3rd receive target surface respectively with Signal acquiring and processing model calling.
Further, described Signal acquiring and processing module comprises the photomultiplier, treatment circuit and the computing machine that are connected successively by wire, photomultiplier receives target surface with first respectively by optical fiber again, second reception target surface and the 3rd receives target surface and is connected, first receives target surface, the characteristic spectrum signal that second reception target surface and the 3rd reception target surface extract sends into photomultiplier respectively, detected the luminous energy of characteristic spectrum signal by photomultiplier after, export the current signal corresponding with its intensity, this current signal transforms and is enlarged into voltage signal by treated circuit again, send into computing machine, the transient temperature of measuring object is obtained by excitation temperature algorithm mathematics model and the model analysis of radiation temperature algorithm mathematics.
Further, described light conducting fibre core footpath is greater than the focused spot diameter of collimator objective.
Further, following relational expression is met between the NA value of described conduction optical fiber and the F number of collimator objective: arctan (1/2F) < arcsinNA.
Further, the focus that end equivalence is positioned at the first off-axis parabolic mirror, the 3rd off-axis parabolic mirror and the 5th off-axis parabolic mirror penetrated by described conduction optical fiber.
Further, described first receives the focal plane that target surface is positioned at the second off-axis parabolic mirror, and second receives the focal plane that target surface is positioned at the 4th off-axis parabolic mirror, and the 3rd receives the focal plane that target surface is positioned at the 6th off-axis parabolic mirror.
The present invention compared with prior art, its remarkable advantage is: (1) utilizes conduction preposition optical facilities of Fiber connection and spectrophotometric device, and spectrophotometric device and the Signal acquiring and processing module that is attached thereto can be made below from the impact of the severe factors such as test site strong electromagnetic radiation, vibration, temperature variation be fast.
(2) spectral range wide (wavelength is at 300-2000nm), can extract the characteristic spectral line of ultraviolet to the multiple element in near-infrared band spectral range.
(3) spectrophotometric device uses binary raster as core beam splitter, has higher diffraction efficiency, improves the capacity usage ratio of target optical spectrum signal, be convenient to photodetector and detect characteristic spectrum signal.
(4) spectrophotometric device uses off axis paraboloid mirror as catoptron collimation and focuses on spectrum, effectively can eliminate aberration, make the focal spot of each characteristic spectrum on reception target surface have less physical dimension, improve spectral resolution, and is convenient to gather.
(5) measure element for often kind, three or more narrow-gap channels can be established to extract many Gents and levy spectral signal and set up multiple equation, and suitable equation model target temperature can be chosen as required, be conducive to improving fitting precision, ensure final measuring accuracy.
(6) structure is simple, and volume is little, is easy to carry.
Accompanying drawing explanation
Fig. 1 is the structural representation of the non-steady environment transient temperature measuring apparatus that the present invention is based on thick smart secondary light-splitting structure.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Composition graphs 1, a kind of non-steady environment transient temperature measuring apparatus based on thick smart secondary light-splitting structure, comprise preposition optical facilities, conduction optical fiber 3, spectrophotometric device and Signal acquiring and processing module, conduction optical fiber 3 one end is connected with preposition optical facilities, the other end is connected with spectrophotometric device, spectrophotometric device again with Signal acquiring and processing model calling.
Preposition optical facilities comprise collimator objective 1, spectroscope 2 and CCD20, collimator objective 1 and spectroscope 2 is set gradually along optical axis, the spectrum of objective emission is after collimator objective 1 is assembled, enter spectroscope 2, reflected light and transmitted light is divided into through spectroscope 2, reflected light enters CCD20, the target surface of CCD20 is positioned at the focal plane place of collimator objective 1 equivalently, it is utilized to observe when measuring and to aim at target at a distance, transmitted light enters one end (incidence end as conduction optical fiber 3) of conduction optical fiber 3, from conduction optical fiber 3 other end (exit end as conduction optical fiber 3) injection, enter spectrophotometric device.
Spectrophotometric device comprises the first Amici prism 4, second Amici prism 5, first binary raster 7, second binary raster 13, the 3rd binary raster 17, first off-axis parabolic mirror 6, second off-axis parabolic mirror 8, the 3rd off-axis parabolic mirror 12, the 4th off-axis parabolic mirror 14, the 5th off-axis parabolic mirror 16, the 6th off-axis parabolic mirror 18, first reception target surface 9, second reception target surface 15 and the 3rd reception target surface 19, common optical axis sets gradually conduction optical fiber 3 exit end, first Amici prism 4 and the second Amici prism 5, from the light of conduction optical fiber 3 exit end injection, different according to spectral coverage through the first Amici prism 4, be divided into infrared, first transmitted light of visible spectrum and the first reflected light of ultraviolet light spectral coverage, first reflected light injects the 3rd off-axis parabolic mirror 12, the second binary raster 13 is injected after the 3rd off-axis parabolic mirror 12 collimates, second binary raster 13 injects the 4th off-axis parabolic mirror 14 after being separated by the spectrum of different wave length, focus on through the 4th off-axis parabolic mirror 14, receive target surface 15 by second and extract the characteristic spectrum signal after the 4th off-axis parabolic mirror 14 focuses on, first transmitted light injects the second Amici prism 5, different according to spectral coverage through the second Amici prism 5, be divided into the second transmitted light of visible spectrum and the second reflected light of infrared light spectral coverage, second reflected light injects the 5th off-axis parabolic mirror 16, after the 5th off-axis parabolic mirror 16 collimates, inject the 3rd binary raster 17, 3rd binary raster 17 injects the 6th off-axis parabolic mirror 18 after being separated by the spectrum of different wave length, focus on through the 6th off-axis parabolic mirror 18, 3rd receives target surface 19 extracts the characteristic spectrum signal focused on through the 6th off-axis parabolic mirror 18, second transmitted light injects the first off-axis parabolic mirror 6, after the first off-axis parabolic mirror 6 collimates, inject the first binary raster 7, first binary raster 7 injects the second off-axis parabolic mirror 8 after being separated by the spectrum of different wave length, after the second off-axis parabolic mirror 8 focuses on, first receives target surface 9 extracts the characteristic spectrum signal focused on through the second off-axis parabolic mirror 8, first receive target surface 9, second receive target surface 15 and the 3rd receive target surface 19 respectively with Signal acquiring and processing model calling.
Signal acquiring and processing module comprises the photomultiplier 10, treatment circuit 11 and the computing machine 21 that are connected successively by wire, photomultiplier 10 receives target surface 9 with first respectively by optical fiber 22 again, second reception target surface 15 and the 3rd receives target surface 19 and is connected, first receives target surface 9, the characteristic spectrum signal that second reception target surface 15 and the 3rd reception target surface 19 extract sends into photomultiplier 10 respectively, detected the luminous energy of characteristic spectrum signal by photomultiplier 10 after, export the current signal corresponding with its intensity, this current signal transforms and is enlarged into voltage signal by treated circuit 11 again, then import in computing machine 21, the excitation temperature algorithm mathematics model announced according to volume the 8th phase in " Chinese laser " August the 29th in 2009 " plasma exciatiaon and radiation temperature transient state spectrum test method " literary composition by process software and the model analysis of radiation temperature algorithm mathematics obtain the transient temperature of measuring object.
Conduction optical fiber 3 is utilized preposition optical facilities to be connected with spectrophotometric device.Conduction optical fiber 3 core diameter is greater than the focused spot diameter of collimator objective 1, thus ensures that the spectrum that the target received by collimator objective 1 sends all can enter conduction optical fiber 3; Following relational expression is met: arctan (1/2F) < arcsinNA between the NA value of conduction optical fiber 3 and the F number of collimator objective 1, thus ensure that the target optical spectrum entering conduction optical fiber 3 can all be totally reflected, conduct to the other end in a fiber.The spectrum that target received by preposition optical facilities sends is conducted to spectrophotometric device by such utilization conduction optical fiber 3.The length of conduction optical fiber 3 is between 80-100 rice, concrete length can be selected according to measurement needs, like this when preposition optical facilities are when existing the test site receiving target spectral signal of the interference such as strong electromagnetic radiation, vibration, difference variation be fast, spectrophotometric device (and below connected Signal acquiring and processing module) can be placed on the on-the-spot far place of distance test, from the impact of these severe factors, the temperature of this invention to the target under astable environment is accurately measured.
The spectrum (300-2000nm) with wide spectral range is divided into two spectral coverages by the first Amici prism 4 of spectrophotometric device, and one of them spectral coverage is ultraviolet light spectral coverage (300-400nm), and another spectral coverage is visible ray, infrared light spectral coverage (400-2000nm); Visible ray, infrared light spectral coverage are divided into visible spectrum (400-760nm) and infrared spectral coverage (760-2000nm) by the second Amici prism 5 of spectrophotometric device further.So in advance the incident light spectrum of target is carried out roughing out, thus shorten the spectral wavelength ranges inciding the second off-axis parabolic mirror 8, the 4th off-axis parabolic mirror 14, the 6th off-axis parabolic mirror 18 respectively, reduce the receiving plane size needed for it, reduce its difficulty of processing and cost, the practical feasibility that assurance device is built, enables the present invention to the characteristic spectral line separation and Extraction of multiple element in 300-2000nm wide spectral range.
Spectrophotometric device adopts binary raster as core beam splitter, and diffraction efficiency can reach more than 90%, improves the capacity usage ratio of target optical spectrum signal, enhances extracted characteristic spectrum signal intensity, makes it easy to photodetector detection.
Place the first off-axis parabolic mirror 6, the 3rd off-axis parabolic mirror 12, the 5th off-axis parabolic mirror 16 respectively, what make the equivalence of conduction optical fiber 3 exit end is positioned at its focal position, be the characteristic of directional light as the diverging light collimation that the pointolite being positioned at its focal position can be sent during catoptron for off axis paraboloid mirror, the light that the first off-axis parabolic mirror 6 reflexes to the first binary raster 7, the 3rd off-axis parabolic mirror 12 reflexes to the second binary raster 13, the 5th off-axis parabolic mirror 16 reflexes to the 3rd binary raster 17 is directional light.The light incident direction inciding the different wave length of the 6th off-axis parabolic mirror 18 after inciding the 4th off-axis parabolic mirror 14, the 3rd binary raster 17 light splitting incide the second off-axis parabolic mirror 8, second binary raster 13 light splitting after the first binary raster 7 light splitting after is different, and the light of Same Wavelength is directional light.The characteristic of aberration can be eliminated by reflect focalization incident parallel light as during catoptron for off axis paraboloid mirror, second off-axis parabolic mirror 8 reflect focalization to the first receives target surface 9, the 4th off-axis parabolic mirror 14 reflect focalization to the second receives target surface 15, the 6th off-axis parabolic mirror 18 reflect focalization will reduce greatly to the 3rd characteristic spectrum disc of confusion size received on target surface 19, thus improve the spectral resolution of system, and be convenient to characteristic spectrum signals collecting.
The focal plane that first reception target surface 9 is positioned at the second off-axis parabolic mirror 8 is set, the focal plane that the second reception target surface 15 is positioned at the 4th off-axis parabolic mirror 14 is set, arrange the 3rd and receive the focal plane that target surface 19 is positioned at the 6th off-axis parabolic mirror 18.Receive each characteristic spectrum correspondence position on target surface 9, second reception target surface 15 and the 3rd reception target surface 19 first and passage slit is set, each passage slit connecting fiber 22, the characteristic spectrum signal extracted is sent into photomultiplier 10.The number of passage slit can be set at reception target surface as required, for often kind of element, more than three or three passage slit can be established, many Gents be extracted to it and levies spectral signal, for setting up multiple equation model target temperature.And suitable equation can be chosen as required carry out matching, improve digital simulation precision, thus ensure final measuring accuracy.
The advantage of the non-steady environment transient temperature measuring apparatus based on thick smart secondary light-splitting structure of the present invention is, utilize conduction preposition optical facilities of Fiber connection and spectrophotometric device, spectrophotometric device and the Signal acquiring and processing module that is attached thereto can be made below from the impact of the severe factors such as test site strong electromagnetic radiation, vibration, temperature variation be fast.Spectral range wide (wavelength is at 300-2000nm), can extract the characteristic spectral line of ultraviolet to the multiple element in near-infrared band spectral range.Spectrophotometric device uses binary raster as core beam splitter, has higher diffraction efficiency, improves the capacity usage ratio of target optical spectrum signal, be convenient to photodetector and detect characteristic spectrum signal.Spectrophotometric device uses off axis paraboloid mirror as catoptron collimation and focuses on spectrum, effectively can eliminate aberration, make the focal spot of each characteristic spectrum on reception target surface have less physical dimension, improve spectral resolution, and is convenient to gather.Measure element for often kind, three or more narrow-gap channels can be established to extract many Gents and levy spectral signal and set up multiple equation, and suitable equation model target temperature can be chosen as required, be conducive to improving fitting precision, ensure final measuring accuracy.Structure is simple, and volume is little, is easy to carry.
Claims (6)
1. the non-steady environment transient temperature measuring apparatus based on thick smart secondary light-splitting structure, it is characterized in that: comprise preposition optical facilities, conduction optical fiber (3), spectrophotometric device and Signal acquiring and processing module, conduction optical fiber (3) one end is connected with preposition optical facilities, the other end is connected with spectrophotometric device, spectrophotometric device again with Signal acquiring and processing model calling;
Described preposition optical facilities comprise collimator objective (1), spectroscope (2) and CCD(20), collimator objective (1) and spectroscope (2) is set gradually along optical axis, the spectrum of objective emission is after collimator objective (1) is assembled, enter spectroscope (2), reflected light and transmitted light is divided into through spectroscope (2), reflected light enters CCD(20), CCD(20) target surface is positioned at the focal plane place of collimator objective (1) equivalently, it is utilized to observe easily when measuring and to aim at target at a distance, transmitted light enters one end of conduction optical fiber (3), from the injection of conduction optical fiber (3) other end, enter spectrophotometric device,
Described spectrophotometric device comprises the first Amici prism (4), second Amici prism (5), first binary raster (7), second binary raster (13), 3rd binary raster (17), first off-axis parabolic mirror (6), second off-axis parabolic mirror (8), 3rd off-axis parabolic mirror (12), 4th off-axis parabolic mirror (14), 5th off-axis parabolic mirror (16), 6th off-axis parabolic mirror (18), first receives target surface (9), second receives target surface (15) and the 3rd receives target surface (19), common optical axis sets gradually conduction optical fiber (3) exit end, first Amici prism (4) and the second Amici prism (5), from the light of conduction optical fiber (3) exit end injection, different according to spectral coverage through the first Amici prism (4), be divided into infrared, first transmitted light of visible spectrum and the first reflected light of ultraviolet light spectral coverage, first reflected light injects the 3rd off-axis parabolic mirror (12), the second binary raster (13) is injected after the 3rd off-axis parabolic mirror (12) collimation, second binary raster (13) injects the 4th off-axis parabolic mirror (14) after being separated by the spectrum of different wave length, focus on through the 4th off-axis parabolic mirror (14), receive target surface (15) by second and extract the characteristic spectrum signal after the 4th off-axis parabolic mirror (14) focuses on, first transmitted light injects the second Amici prism (5), different according to spectral coverage through the second Amici prism (5), be divided into the second transmitted light of visible spectrum and the second reflected light of infrared light spectral coverage, second reflected light injects the 5th off-axis parabolic mirror (16), after the 5th off-axis parabolic mirror (16) collimation, inject the 3rd binary raster (17), 3rd binary raster (17) injects the 6th off-axis parabolic mirror (18) after being separated by the spectrum of different wave length, focus on through the 6th off-axis parabolic mirror (18), 3rd receives target surface (19) extracts the characteristic spectrum signal focused on through the 6th off-axis parabolic mirror (18), second transmitted light injects the first off-axis parabolic mirror (6), after the first off-axis parabolic mirror (6) collimation, inject the first binary raster (7), first binary raster (7) injects the second off-axis parabolic mirror (8) after being separated by the spectrum of different wave length, after the second off-axis parabolic mirror (8) focuses on, first receives target surface (9) extracts the characteristic spectrum signal focused on through the second off-axis parabolic mirror (8), first receive target surface (9), second receive target surface (15) and the 3rd reception target surface (19) respectively with Signal acquiring and processing model calling.
2. the non-steady environment transient temperature measuring apparatus based on thick smart secondary light-splitting structure according to claim 1, is characterized in that: described Signal acquiring and processing module comprises the photomultiplier (10), treatment circuit (11) and the computing machine (21) that are connected successively by wire, photomultiplier (10) receives target surface (9) with first respectively by optical fiber (22) again, second reception target surface (15) and the 3rd receives target surface (19) and is connected, first receives target surface (9), the characteristic spectrum signal that second reception target surface (15) and the 3rd reception target surface (19) are extracted sends into photomultiplier (10) respectively, after detecting the luminous energy of characteristic spectrum signal by photomultiplier (10), export the current signal corresponding with its intensity, this current signal transforms and is enlarged into voltage signal by treated circuit (11) again, send into computing machine (21), the transient temperature of measuring object is obtained by excitation temperature algorithm mathematics model and the model analysis of radiation temperature algorithm mathematics.
3. the non-steady environment transient temperature measuring apparatus based on thick smart secondary light-splitting structure according to claim 1, is characterized in that: described conduction optical fiber (3) core diameter is greater than the focused spot diameter of collimator objective (1).
4. the non-steady environment transient temperature measuring apparatus based on thick smart secondary light-splitting structure according to claim 1, is characterized in that: meet following relational expression between the NA value of described conduction optical fiber (3) and the F number of collimator objective (1): arctan (1/2F) < arcsinNA.
5. the non-steady environment transient temperature measuring apparatus based on thick smart secondary light-splitting structure according to claim 1, is characterized in that: the exit end equivalence of described conduction optical fiber (3) is positioned at the focus of the first off-axis parabolic mirror (6), the 3rd off-axis parabolic mirror (12) and the 5th off-axis parabolic mirror (16).
6. the non-steady environment transient temperature measuring apparatus based on thick smart secondary light-splitting structure according to claim 1, it is characterized in that: described first receives the focal plane that target surface (9) is positioned at the second off-axis parabolic mirror (8), second receives the focal plane that target surface (15) is positioned at the 4th off-axis parabolic mirror (14), and the 3rd receives the focal plane that target surface (19) is positioned at the 6th off-axis parabolic mirror (18).
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105806726A (en) * | 2016-03-14 | 2016-07-27 | 中国科学院力学研究所 | In-place transient state temperature measurement device for high-speed cutting |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105806726A (en) * | 2016-03-14 | 2016-07-27 | 中国科学院力学研究所 | In-place transient state temperature measurement device for high-speed cutting |
| CN105806726B (en) * | 2016-03-14 | 2019-12-27 | 中国科学院力学研究所 | High-speed cutting in-place transient temperature measuring device |
| TWI565321B (en) * | 2016-03-23 | 2017-01-01 | Image and temperature coaxial measurement and display device | |
| CN109425434A (en) * | 2017-09-04 | 2019-03-05 | 南京理工大学 | A kind of plasma three dimensional temperature field measurement device for eliminating emissivity error |
| CN111795745A (en) * | 2020-05-29 | 2020-10-20 | 红鼎互联(广州)信息科技有限公司 | Temperature calibration processing method for infrared image |
| CN113074828A (en) * | 2021-03-23 | 2021-07-06 | 西安晶淼光电科技有限公司 | Explosion flame light splitting unit, spectrum light splitting temperature measuring system and method |
| CN114509166A (en) * | 2022-01-27 | 2022-05-17 | 重庆大学 | High transient high temperature plasma temperature measurement system |
| CN114509166B (en) * | 2022-01-27 | 2024-02-23 | 重庆大学 | High-transient high-temperature plasma temperature measurement system |
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