CN111521297A - Spectrum-temperature calibration device and method suitable for phosphorescence ratio light intensity method - Google Patents
Spectrum-temperature calibration device and method suitable for phosphorescence ratio light intensity method Download PDFInfo
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- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K15/00—Testing or calibrating of thermometers
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- G01K1/143—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations for measuring surface temperatures
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- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
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- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
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- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
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- G01N21/6402—Atomic fluorescence; Laser induced fluorescence
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Abstract
The invention discloses a spectrum-temperature calibration device and a calibration method suitable for a phosphorescence ratio light intensity method. The spectrum-temperature calibration device comprises: the system comprises a laser light source, a laser transmission system, a bicolor system, a heating system, a radiation light transmission system, a signal acquisition system and a data processing system; the heating system comprises a heating furnace, a sample to be detected and a thermocouple; the sample to be tested is placed on a clamp in a heating furnace; the surface of the sample to be detected is coated with a phosphorescent coating; the thermocouple is welded on the back of the sample to be measured; the heating furnace is provided with an optical window. The invention provides a controllable high-temperature environment and a light path transmission channel for a sample to be measured by utilizing the heating furnace and the matched optical channel thereof, effectively simulates the high-temperature environment of an aero-engine, can measure the change rule of the phosphorescence characteristic of the sample along with the temperature, and provides basic data support for the temperature measurement by a specific light intensity method; and through the ingenious setting of double-colored system, the experimental apparatus has been simplified greatly.
Description
Technical Field
The invention relates to the technical field of non-contact solid surface temperature measurement, in particular to a spectrum-temperature calibration device and a calibration method suitable for a phosphorescence ratio light intensity method.
Background
The turbine front temperature of the aircraft engine directly determines the efficiency and the output work of the whole aircraft engine, so that the turbine front temperature must be increased to improve the thrust and the thermal efficiency of the actual aircraft engine. However, the design of hot end components such as turbine disks and turbine blades is also highly demanding as the turbine front temperature is increased. In the design stage, the safety and the service life of the hot end part are directly determined by the temperature level and the temperature gradient of the hot end part of the aircraft engine, and the temperature level and the temperature gradient depend on the cooling design of the high temperature part and the precision of an engine thermal analysis system, so that the accurate acquisition of the surface temperature of the hot end part cannot be avoided. In the aspects of use and maintenance, the real-time temperature measurement can be used for monitoring the real-time performance of a thermal protection system and key components, troubleshooting is carried out in time, the reliability and the safety of the aircraft engine are improved, and the residual life of key components can be predicted.
However, the accurate acquisition of the surface temperature of high-temperature solids such as turbine blades and turbine discs of aero-engines is a big problem in the current aeronautical measurement technology under the influence of harsh conditions such as complex gas environment, high temperature, high rotating speed and the like. The traditional temperature measurement technology has certain defects. The infrared temperature measurement method is limited by factors such as luminous flame, reflected radiation, surface emissivity change, low cleanness of an optical system and the like, so that the application is very difficult; the thermocouple is affected by the factors of manufacturing cost, interference on the part to be measured, inconvenience for replacement and disassembly, lead wires and the like, and only single-point temperature measurement can be realized.
The phosphorescence thermometry can effectively overcome the problems and is not influenced by the complex fuel gas components of the aircraft engine. The technology is to measure the temperature by utilizing the luminescent characteristic of the ceramic doped with lanthanide along with the temperature change. In order to measure the surface temperature, a layer of such a coating is applied to the surface of a material, irradiated with an excitation light source such as ultraviolet light, and the surface temperature is obtained by measuring the excited light.
The specific light intensity method is one of phosphorescence temperature measurement methods, when a coating is excited, phosphorescence can be radiated, the light intensity distribution of the radiated light changes along with the change of temperature, and the specific function relationship exists between the ratio of the light intensities at two different wavelengths in the radiated light and the temperature. Therefore, in practical application, the corresponding relationship between the light intensity ratio and the temperature needs to be calibrated.
The existing instrument for fluorescence/phosphorescence spectral analysis is mainly a fluorescence spectrophotometer, but the equipment structure is complex, a controllable high-temperature environment cannot be provided for a sample, the change rule of phosphorescence characteristics of the sample along with temperature cannot be obtained, and the fluorescence/phosphorescence spectral analysis is not suitable for measuring temperature by a specific intensity method. Therefore, it is necessary to develop and design a calibration device which can realize controllable sample temperature and higher upper limit temperature and can be suitable for a specific light intensity thermometry method.
Disclosure of Invention
The invention aims to provide a spectrum-temperature calibration device and a calibration method suitable for a phosphorescence ratio light intensity method, and aims to solve the problems that the existing instrument for fluorescence/phosphorescence spectrum analysis is complex in structure, cannot provide a controllable high-temperature environment for a sample, cannot obtain the change rule of phosphorescence characteristics of the sample along with temperature, and is not suitable for temperature measurement of the ratio light intensity method.
In order to achieve the purpose, the invention provides the following scheme:
a spectrum-temperature calibration apparatus suitable for the phosphorescence ratio light intensity method, the spectrum-temperature calibration apparatus comprising: the system comprises a laser light source, a laser transmission system, a bicolor system, a heating system, a radiation light transmission system, a signal acquisition system and a data processing system;
the laser light source is used for generating laser for exciting phosphorescence of a sample to be detected; the laser transmission system is positioned on an emergent light path of the laser light source; the two-color system is respectively positioned on a reflection light path of the laser transmission system and an emergent light path of the heating system; the heating system is positioned on a reflection light path of the two-color system; the radiant light transmission system is positioned on a transmission light path of the bicolor system; the signal acquisition system is positioned on an emergent light path of the radiation light transmission system; the signal acquisition system is respectively connected with the laser light source and the data processing system;
the heating system comprises a heating furnace, a sample to be detected and a thermocouple; the sample to be tested is placed on a clamp in the heating furnace; the surface of the sample to be detected is coated with a phosphorescent coating; the thermocouple is welded on the back of the sample to be detected; and an optical window is arranged on one side of the heating furnace facing the bicolor system.
Optionally, the laser transmission system includes a power meter, a beam splitter, and a mirror; the beam splitter is arranged on an emergent light path of the laser light source; the power meter is arranged on a reflected light path of the beam splitter; the reflecting mirror is arranged on a transmission light path of the beam splitter.
Optionally, the dichroic mirror comprises a dichroic mirror; the dichroic mirror is arranged on a reflection light path of the reflecting mirror; the heating furnace is arranged on a reflection light path of the dichroic mirror; and the laser reflected by the dichroic mirror is irradiated on the sample to be measured through the optical window.
Optionally, the radiant light transmission system comprises a long-pass filter and a convex lens; the signal acquisition system comprises a monochromator, a CCD detector and an acquisition card which are connected in sequence;
the dichroic mirror is also arranged on an emergent light path of the heating furnace; the long-pass filter and the convex lens are sequentially arranged on a transmission light path of the dichroic mirror; and after the phosphorescence radiated by the sample to be detected under the induction of the laser is emitted from the optical window, the phosphorescence is transmitted to the long-pass filter through the dichroic mirror and then transmitted to the convex lens through the long-pass filter, and the phosphorescence is focused on the entrance slit of the monochromator through the convex lens.
Optionally, the data processing system comprises a computer; the acquisition card is also respectively connected with the laser light source and the computer;
the monochromator is used for separating monochromatic light signals with single wavelength from the phosphorescent signals and inputting the monochromatic light signals to the CCD detector; the CCD detector converts the monochromatic light signals into analog electric signals and inputs the analog electric signals into the acquisition card; the analog electric signal comprises light intensity information of the monochromatic light signal; the acquisition card converts the analog electric signal input from the CCD detector into a digital light intensity signal and sends the digital light intensity signal to the computer.
Optionally, the monochromator is configured to continuously change the wavelength of the output monochromatic light; the computer is used for acquiring the digital light intensity signal under each wavelength and drawing a spectral characteristic curve according to the wavelength and the corresponding digital light intensity signal; the computer is also connected with the thermocouple and is used for acquiring the temperature of the surface of the sample to be measured; and the computer is also used for generating a change curve of the light intensity ratio along with the temperature as a calibration curve according to the temperature and the corresponding spectral characteristic curve.
A spectrum-temperature calibration method suitable for a phosphorescence ratio light intensity method, wherein the spectrum-temperature calibration method is based on the spectrum-temperature calibration device; the spectrum-temperature calibration method comprises the following steps:
installing and fixing a sample to be detected on a clamp in a heating furnace;
setting the heating temperature of the heating furnace, and starting the heating furnace to heat the sample to be measured;
after the temperature in the heating furnace is stable, starting a laser light source, a laser transmission system, a two-color system, a radiation light transmission system, a signal acquisition system and a data processing system;
the signal acquisition system acquires the phosphorescence signal radiated by the sample to be detected after being triggered by the laser light source, converts the phosphorescence signal into a digital light intensity signal and transmits the digital light intensity signal into the data processing system;
the data processing system integrates and plots digital light intensity signals of the signal acquisition system in a plurality of laser pulses to generate a spectral characteristic curve of phosphorescence light intensity changing along with wavelength;
the thermocouple arranged on the back of the sample to be detected collects the temperature of the surface of the sample to be detected and sends the temperature to the data processing system;
and the data processing system generates a change curve of the light intensity ratio along with the temperature as a calibration curve according to the temperature and the corresponding spectral characteristic curve.
Optionally, the signal acquisition system acquires the phosphorescence signal radiated by the sample to be detected and converts the phosphorescence signal into a digital light intensity signal, and transmits the digital light intensity signal into the data processing system, and the signal acquisition system specifically includes:
the signal acquisition system comprises a monochromator, a CCD detector and an acquisition card which are connected in sequence;
the monochromator separates monochromatic light signals with single wavelength from the phosphorescent light signals and inputs the monochromatic light signals to the CCD detector;
the CCD detector converts the monochromatic light signals into analog electric signals and inputs the analog electric signals into the acquisition card; the analog electric signal comprises light intensity information of the monochromatic light signal;
the acquisition card converts the analog electric signal input from the CCD detector into a digital light intensity signal and sends the digital light intensity signal to the data processing system.
Optionally, the data processing system generates a variation curve of the light intensity ratio with the temperature according to the temperature and the corresponding spectral characteristic curve as a calibration curve, and specifically includes:
the data processing system calculates the light intensity ratio corresponding to the spectral characteristic curve;
and the data processing system takes the temperature as an abscissa, the light intensity ratio corresponding to the temperature as an ordinate, and a variation curve of the light intensity ratio with the temperature is generated as the calibration curve.
Optionally, the calculating, by the data processing system, a light intensity ratio corresponding to the spectral characteristic curve specifically includes:
the data processing system acquires wavelengths corresponding to two peaks on the spectral characteristic curve, wherein the wavelengths are a first wavelength and a second wavelength respectively;
the data processing system calculates a ratio of the first wavelength and the second wavelength as the light intensity ratio.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a spectrum-temperature calibration device and a calibration method suitable for a phosphorescence ratio light intensity method, wherein the spectrum-temperature calibration device comprises: the system comprises a laser light source, a laser transmission system, a bicolor system, a heating system, a radiation light transmission system, a signal acquisition system and a data processing system; the laser light source is used for generating laser for exciting phosphorescence of a sample to be detected; the laser transmission system is positioned on an emergent light path of the laser light source; the two-color system is respectively positioned on a reflection light path of the laser transmission system and an emergent light path of the heating system; the heating system is positioned on a reflection light path of the two-color system; the radiant light transmission system is positioned on a transmission light path of the bicolor system; the signal acquisition system is positioned on an emergent light path of the radiation light transmission system; the signal acquisition system is respectively connected with the laser light source and the data processing system; the heating system comprises a heating furnace, a sample to be detected and a thermocouple; the sample to be tested is placed on a clamp in the heating furnace; the surface of the sample to be detected is coated with a phosphorescent coating; the thermocouple is welded on the back of the sample to be detected; and an optical window is arranged on one side of the heating furnace facing the bicolor system. The invention provides a controllable high-temperature environment and a light path transmission channel for a sample to be measured by utilizing the heating furnace and the matched optical channel thereof, effectively simulates the high-temperature environment of an aero-engine, can measure the change rule of the phosphorescence characteristic of the sample along with the temperature, and provides basic data support for the temperature measurement by a specific light intensity method; and through the ingenious setting of double-colored system, the experimental apparatus has been simplified greatly.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic diagram of the overall structure of a spectrum-temperature calibration device suitable for the phosphorescence ratio light intensity method provided by the invention;
FIG. 2 is a schematic diagram of a specific structure of a spectrum-temperature calibration device suitable for a phosphorescence ratio light intensity method according to the present invention;
the numbers in the figures are respectively: the device comprises a laser light source 1, a power meter 2, a beam splitter 3, a reflector 4, a sample to be measured 5, a heating furnace 6, an optical window 7 on the heating furnace, a dichroic mirror 8, a long-pass filter 9, a convex lens 10, a monochromator 11, a linear array CCD detector 12, an acquisition card 13, a computer 14 and a thermocouple 15.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a spectrum-temperature calibration device suitable for a phosphorescence ratio light intensity method, which can control the environment temperature of a sample to be tested, effectively simulate the working temperature of an engine under different working conditions and obtain a calibration curve of the phosphorescence characteristics of the sample to be tested; the invention also aims to provide a spectrum-temperature calibration method suitable for a phosphorescence ratio light intensity method, which can measure the spectral characteristic curve of phosphorescence light intensity radiated by a sample to be measured along with the change of wavelength, and can simulate the temperature of an aircraft engine under different working conditions to obtain the change rule of the spectral characteristic curve of the sample to be measured along with the temperature; the problems that the existing instrument for fluorescence/phosphorescence spectrum analysis is complex in structure, cannot provide a controllable high-temperature environment for a sample, cannot obtain the change rule of the phosphorescence characteristics of the sample along with the temperature, and is not suitable for temperature measurement by a specific intensity method are solved.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a schematic diagram of the overall structure of a spectrum-temperature calibration device suitable for the phosphorescence ratio light intensity method provided by the invention. Referring to fig. 1, the present invention provides a spectrum-temperature calibration apparatus suitable for a phosphorescence ratio light intensity method, including: the device comprises a laser light source 1, a laser transmission system, a two-color system, a heating system, a radiation light transmission system, a signal acquisition system and a data processing system.
The laser light source 1 is used for generating laser for exciting phosphorescence of a sample to be detected, and the wavelength of the laser light is not more than 532 nm.
The laser transmission system is positioned on an emergent light path of the laser light source. The laser transmission system can efficiently transmit laser light to the two-color system. Optionally, the laser transmission system may monitor power fluctuation of the laser in real time.
The two-color system is respectively positioned on a reflection light path of the laser transmission system and an emergent light path of the heating system. The two-color system can reflect laser to form an optical channel through which the laser irradiates on a sample to be detected; and the radiation light can be effectively transmitted, and the radiation light can be ensured to enter the radiation light transmission system.
The heating system is positioned on a reflection light path of the two-color system. The heating system comprises a heating furnace, a sample to be detected (sample for short) and a thermocouple. The sample to be tested is placed on a clamp in the heating furnace; the surface of the sample to be detected is coated with a phosphorescent coating; the thermocouple is welded on the back of the sample to be detected; and an optical window is arranged on one side of the heating furnace facing the bicolor system. The heating furnace can control the temperature of the environment where the sample is located, an optical channel is arranged on the furnace wall of the heating furnace, and a clamp for placing the sample is arranged in the cavity. Optionally, the controllable temperature range of the heating furnace is from room temperature to 1400K, so as to better simulate the working environment of the turbine of the aircraft engine.
The radiant light delivery system is located on a light transmission path of the bi-color system. The signal acquisition system is positioned on an emergent light path of the radiation light transmission system. The signal acquisition system is respectively connected with the laser light source and the data processing system.
The radiant light transmission system is capable of receiving the radiant light passing through the two-color system and transmitting it to the signal acquisition system.
The signal acquisition system can receive the trigger signal of the laser light source 1, so that the radiation light signal is converted into an electric signal, light intensity values at two different wavelengths of the radiation light are obtained, and finally, the light intensity values are transmitted into the data processing system in a digital signal mode.
The data processing system can draw the digital signal of the light intensity into a spectral characteristic curve of the light intensity changing along with the wavelength, and can compare and analyze the spectral characteristic curves obtained at different temperatures.
Fig. 2 is a schematic structural diagram of a spectrum-temperature calibration device suitable for the phosphorescence ratio light intensity method according to the present invention. Referring to fig. 2, the laser transmission system is formed by a power meter 2, a beam splitter 3 and a reflecting mirror 4. Dichroic mirror 8 is a dichroic system selected in this embodiment. The long-pass filter 9 and the convex lens 10 constitute the radiation light transmission system. The signal acquisition system is composed of a monochromator 11, a CCD detector 12 (preferably a linear array CCD detector is adopted in the invention) and an acquisition card 13 which are connected in sequence. Computer 14 is the data processing system of choice in this embodiment. The acquisition card 13 is respectively connected with the laser light source 1 and the computer 14.
The beam splitter 3 is arranged on an emergent light path of the laser light source 1; the power meter 2 is arranged on a reflection light path of the beam splitter 3; the mirror 4 is disposed on the transmission light path of the beam splitter 3. The dichroic mirror 8 is arranged on a reflection light path of the reflecting mirror 4; the heating furnace 6 is arranged on a reflection light path of the dichroic mirror 8; the laser light reflected by the dichroic mirror 8 is irradiated onto the sample 5 to be measured through the optical window 7.
The dichroic mirror 8 is also arranged on an emergent light path of the heating furnace 6; the long-pass filter 9 and the convex lens 10 are sequentially arranged on a transmission light path of the dichroic mirror 8; phosphorescence emitted by the sample 5 to be measured under the induction of laser is emitted from the optical window 7, then is transmitted to the long-pass filter 9 through the dichroic mirror 8, and is transmitted to the convex lens 10 through the long-pass filter 9, and the phosphorescence is focused on an entrance slit of the monochromator 11 through the convex lens 10.
The monochromator 11 is used for separating monochromatic light signals with single wavelength from the phosphorescent signals and inputting the monochromatic light signals into the linear array CCD detector 12; the linear array CCD detector 12 converts the monochromatic light signal into an analog electrical signal and inputs the analog electrical signal to the acquisition card 13; the analog electric signal comprises light intensity information of the monochromatic light signal. The acquisition card 13 converts the analog electrical signal input from the linear array CCD detector 12 into a digital light intensity signal and sends the digital light intensity signal to the computer 14.
The monochromator 11 may be used to continuously vary the wavelength of the output monochromatic light. The computer 14 is configured to obtain the digital light intensity signal at each wavelength, and draw a spectral characteristic curve according to the wavelength and the corresponding digital light intensity signal. The computer 14 is further connected with the thermocouple 15, and is configured to obtain the temperature of the surface of the sample 5 to be measured. The computer 14 is further configured to generate a variation curve of the light intensity ratio with the temperature as a calibration curve according to the temperature and the corresponding spectral characteristic curve.
Specifically, the laser light source 1 can provide a pulse laser for exciting phosphorescence of a sample to be detected, and the wavelength of the pulse laser is preferably 266nm and the frequency of the pulse laser is 20 Hz.
The power meter 2 can measure the optical power of the laser in real time, so as to monitor the power fluctuation of the laser.
The beam splitter 3 can transmit laser with a specific proportion and reflect the rest of the laser, the reflected laser enters the power meter 2, and the transmitted laser enters the reflector 4.
The dichroic mirror 8 can reflect the laser light, create an optical channel for the laser light to enter the heating furnace 6, and also does not affect the transmission of the radiation light with longer wavelength. In the spectral-temperature calibration device of the present invention, the light radiated by the sample is phosphorescence. The center wavelength of the radiated light (i.e., the phosphorescence) is 442nm, and the transmission range is 350-700 nm.
The heating furnace 6 is capable of providing the sample 5 with a temperature from room temperature to 1400K, and is equipped with a circular optical window 7 having a diameter of 50mm for the entrance of laser light and the exit of irradiation light. The heating furnace 6 is also internally provided with a clamp for placing a sample 5 to be measured, the sample 5 to be measured is a disc with the diameter of 30mm, and the back surface of the disc is welded with a thermocouple 15 for measuring the temperature of the sample, preferably a K-type thermocouple. The thermocouple 15 is connected to the computer 14, and transmits the measured temperature value to the computer 14 in real time.
The long-pass filter 9 has a standard wavelength of 270nm, and can transmit the radiation light and reflect the laser light, so as to further eliminate the interference of the laser light on the experimental result.
The focal length of the convex lens 10 is just enough to focus the radiation light emitted by the sample 5 to be measured on the entrance slit of the monochromator 11.
The monochromator 11 is used for separating "monochromatic light" from the radiated light having a complicated spectral composition, by which is meant light having a wavelength range so narrow as to be regarded as only a single wavelength with respect to the spectral composition of the radiated light. The monochromator 11 is provided with an adjusting mechanism and can output radiation monochromatic light of 300-700 nm.
The linear array CCD detector 12 can detect the light intensities corresponding to the radiation lights with different wavelengths, convert the light intensity signals into electrical signals, and transmit the measured electrical signals to the acquisition card 13.
The acquisition card 13 is connected to the linear array CCD detector 12, the laser light source 1 and the computer 14, and is capable of receiving a start signal from the laser light source 1 to trigger the linear array CCD detector 12, receiving an analog electrical signal from the linear array CCD detector 12, converting the analog electrical signal into a digital light intensity signal, and transmitting the digital light intensity signal to the computer 14 for subsequent processing.
Based on the spectrum-temperature calibration device, the invention also provides a spectrum-temperature calibration method suitable for a phosphorescence ratio light intensity method, and the spectrum-temperature calibration method comprises the following steps:
step 1: and installing and fixing the sample to be tested on a clamp in the heating furnace.
And welding a thermocouple 15 on the back surface of the sample 5 to be detected, and installing and fixing the sample on a fixture in the heating furnace 6.
The method comprises the steps that a laser light source, a laser transmission system, a heating system, a two-color system, a radiation light transmission system, a signal acquisition system and a data processing system are connected to form a spectrum-temperature calibration device suitable for phosphorescence temperature measurement, the spectrum-temperature calibration device is utilized to simulate high-temperature environments in different application scenes, the change rule of phosphorescence characteristics of a sample 5 to be measured under the induction of laser along with temperature is obtained, and basic data are provided for a specific light intensity method of phosphorescence temperature measurement.
Step 2: and setting the heating temperature of the heating furnace, and starting the heating furnace to heat the sample to be detected.
And starting the heating furnace 6 to heat the sample 5, and setting the temperature of the heating furnace 6 to provide a specific temperature condition for the calibration experiment.
And step 3: and after the temperature in the heating furnace is stable, starting a laser light source, a laser transmission system, a two-color system, a radiation light transmission system, a signal acquisition system and a data processing system.
After the temperature of the heating furnace 6 is stabilized, other devices are started, the linear array CCD detector 12 starts to acquire the light intensity signal of the radiation light and converts the light intensity signal into a digital signal, and the acquisition card 13 acquires the light intensity signal of the linear array CCD detector 12 according to the trigger signal triggered by the laser light source 1 and transmits the digital light intensity signal to the computer 14.
And 4, step 4: and the signal acquisition system acquires the phosphorescence signal radiated by the sample to be detected after being triggered by the laser light source, converts the phosphorescence signal into a digital light intensity signal and transmits the digital light intensity signal into the data processing system.
The monochromator 11 separates monochromatic light signals with single wavelength from the phosphorescent signals and inputs the monochromatic light signals to the linear array CCD detector 12; the linear array CCD detector 12 converts the monochromatic light signal into an analog electrical signal and inputs the analog electrical signal to the acquisition card 13; the analog electric signal comprises light intensity information of the monochromatic light signal; the acquisition card 13 converts the analog electrical signal input from the linear array CCD detector 12 into a digital light intensity signal and sends the digital light intensity signal to the data processing system 14.
And 5: and the data processing system integrates and plots the digital light intensity signals of the signal acquisition system in a plurality of laser pulses to generate a spectral characteristic curve of phosphorescence light intensity changing along with wavelength.
The computer 14 integrates the light intensity signal transmitted from the acquisition card 13 in a plurality of laser pulses and plots the light intensity signal to obtain a spectral characteristic curve of the phosphorescence light intensity along with the wavelength change. The abscissa of the spectral characteristic curve is the wavelength of phosphorescence, and the ordinate is the phosphorescence intensity.
Specifically, phosphorescence emitted from the sample 5 is dispersed into monochromatic light with a single wavelength by the monochromator 11 and is input to the linear array CCD detector 12, the linear array CCD detector 12 converts an optical signal into an electrical signal and inputs the electrical signal to the acquisition card 13, the electrical signal contains light intensity information of the monochromatic light, and the acquisition card 13 converts an analog signal input from the linear array CCD detector 12 into a digital signal and inputs the digital signal to the computer 14 for storage and analysis, so as to obtain light intensity data at the wavelength. The monochromator 11 can continuously change the wavelength of the outputted monochromatic light, the light with each wavelength is subjected to the above process, so that the light intensity data under each wavelength in the range of 300-700nm can be obtained, and the spectral characteristic curve can be drawn by setting the wavelength and the corresponding light intensity as the abscissa and the ordinate respectively.
Step 6: and the thermocouple arranged on the back of the sample to be detected collects the temperature of the surface of the sample to be detected and sends the temperature to the data processing system.
The set temperature of the heating furnace 6 is changed every time, and after the temperature of the heating furnace 6 is stabilized, the thermocouple 15 installed on the back of the sample 5 to be measured is used for collecting the temperature of the surface of the sample 5 to be measured and sending the temperature to the computer 14.
And 7: and the data processing system generates a change curve of the light intensity ratio along with the temperature as a calibration curve according to the temperature and the corresponding spectral characteristic curve.
And (4) changing the set temperature of the heating furnace 6, repeating the steps 4-6 after the temperature of the heating furnace 6 is stabilized again, and obtaining the change rule of the phosphorescence spectral characteristic curve along with the temperature. The spectrum-temperature calibration device can obtain a phosphorescence spectrum characteristic curve and a corresponding table of wavelength data and light intensity data at each temperature, draws the curve at each temperature on the same graph, integrates the tables together and stores the tables, and then the change rule of the phosphorescence spectrum characteristic curve along with the temperature can be obtained.
In a graph in which the phosphorescence spectral characteristics at different temperatures are integrated, wavelengths corresponding to two peaks are selected, the wavelengths corresponding to the two peaks satisfying the following relationship:
wherein I1And I2Light intensities, I, corresponding to two wavelengths respectively1/I2Is the ratio of light intensity corresponding to two wavelengths, Δ E is the energy gap of the excited state electron energy level corresponding to two wavelengths, T is the absolute temperature, kBIs the boltzmann constant.
The light intensity of the two wavelengths at each temperature is subjected to ratio, and a change curve of the light intensity ratio along with the temperature is obtained.
That is, the step 7 specifically includes:
the data processing system calculates a light intensity ratio corresponding to the spectral characteristic curve, and specifically includes: the data processing system acquires wavelengths corresponding to two peaks on the spectral characteristic curve, wherein the wavelengths are a first wavelength and a second wavelength respectively; the data processing system calculates a ratio of the first wavelength and the second wavelength as the light intensity ratio;
and the data processing system takes the temperature as an abscissa, the light intensity ratio corresponding to the temperature as an ordinate, and a variation curve of the light intensity ratio with the temperature is generated as the calibration curve.
In practical application, the spectral characteristic curve of the phosphorescent coating can be obtained only by replacing the heating system in the spectral-temperature calibration device of the invention with a high-temperature part of an aeroengine and coating the high-temperature part with the phosphorescent coating. And selecting the light intensity ratio of two wavelengths corresponding to two peak values in the spectral characteristic curve, and interpolating the light intensity ratio with the calibration curve measured by the method to obtain the coating temperature, namely obtaining the surface temperature of the high-temperature component.
The phosphorescence temperature measurement technology can measure the temperature of the rotating assembly, has low requirement on the cleanliness of the environment, has no relation between the luminescence and the blackbody radiation and the surface emissivity, and is more suitable for the non-contact measurement of the temperature of the high-temperature environment compared with the existing temperature measurement technology. The invention provides a spectrum-temperature calibration device and a spectrum-temperature calibration method for a specific light intensity method of a phosphorescence temperature measurement technology, which utilize a heating furnace 6 to provide a specific temperature environment for a sample 5, integrate response signals of a signal acquisition system in a plurality of laser pulses, effectively obtain the change rule of a spectral characteristic curve of the sample 5 to be measured along with the temperature, and provide calibration data for phosphorescence temperature measurement. In addition, the invention can provide a light path transmission channel for the sample 5 by only installing one optical window 7 on the heating furnace 6 through the application of the bicolor system, simplify the scheme and save the cost in the experiment, eliminate the errors caused by the different angles of the incident light and the emergent light relative to the sample, and improve the data calibration precision.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. A spectrum-temperature calibration apparatus suitable for phosphorescence ratio light intensity method, wherein the spectrum-temperature calibration apparatus comprises: the system comprises a laser light source, a laser transmission system, a bicolor system, a heating system, a radiation light transmission system, a signal acquisition system and a data processing system;
the laser light source is used for generating laser for exciting phosphorescence of a sample to be detected; the laser transmission system is positioned on an emergent light path of the laser light source; the two-color system is respectively positioned on a reflection light path of the laser transmission system and an emergent light path of the heating system; the heating system is positioned on a reflection light path of the two-color system; the radiant light transmission system is positioned on a transmission light path of the bicolor system; the signal acquisition system is positioned on an emergent light path of the radiation light transmission system; the signal acquisition system is respectively connected with the laser light source and the data processing system;
the heating system comprises a heating furnace, a sample to be detected and a thermocouple; the sample to be tested is placed on a clamp in the heating furnace; the surface of the sample to be detected is coated with a phosphorescent coating; the thermocouple is welded on the back of the sample to be detected; and an optical window is arranged on one side of the heating furnace facing the bicolor system.
2. The spectrum-temperature calibration apparatus according to claim 1, wherein the laser transmission system comprises a power meter, a beam splitter and a mirror; the beam splitter is arranged on an emergent light path of the laser light source; the power meter is arranged on a reflected light path of the beam splitter; the reflecting mirror is arranged on a transmission light path of the beam splitter.
3. The spectrum-temperature calibration apparatus according to claim 2, wherein the two-color system comprises a dichroic mirror; the dichroic mirror is arranged on a reflection light path of the reflecting mirror; the heating furnace is arranged on a reflection light path of the dichroic mirror; and the laser reflected by the dichroic mirror is irradiated on the sample to be measured through the optical window.
4. The spectrum-temperature calibration apparatus of claim 3, wherein the radiant light transmission system comprises a long-pass filter and a convex lens; the signal acquisition system comprises a monochromator, a CCD detector and an acquisition card which are connected in sequence;
the dichroic mirror is also arranged on an emergent light path of the heating furnace; the long-pass filter and the convex lens are sequentially arranged on a transmission light path of the dichroic mirror; and after the phosphorescence radiated by the sample to be detected under the induction of the laser is emitted from the optical window, the phosphorescence is transmitted to the long-pass filter through the dichroic mirror and then transmitted to the convex lens through the long-pass filter, and the phosphorescence is focused on the entrance slit of the monochromator through the convex lens.
5. The spectrum-temperature calibration apparatus according to claim 4, wherein the data processing system comprises a computer; the acquisition card is also respectively connected with the laser light source and the computer;
the monochromator is used for separating monochromatic light signals with single wavelength from the phosphorescent signals and inputting the monochromatic light signals to the CCD detector; the CCD detector converts the monochromatic light signals into analog electric signals and inputs the analog electric signals into the acquisition card; the analog electric signal comprises light intensity information of the monochromatic light signal; the acquisition card converts the analog electric signal input from the CCD detector into a digital light intensity signal and sends the digital light intensity signal to the computer.
6. The spectrum-temperature calibration device according to claim 5, wherein the monochromator is configured to continuously vary the wavelength of the outputted monochromatic light; the computer is used for acquiring the digital light intensity signal under each wavelength and drawing a spectral characteristic curve according to the wavelength and the corresponding digital light intensity signal; the computer is also connected with the thermocouple and is used for acquiring the temperature of the surface of the sample to be measured; and the computer is also used for generating a change curve of the light intensity ratio along with the temperature as a calibration curve according to the temperature and the corresponding spectral characteristic curve.
7. A spectrum-temperature calibration method suitable for a phosphorescence ratio light intensity method, wherein the spectrum-temperature calibration method is based on the spectrum-temperature calibration apparatus according to claim 1; the spectrum-temperature calibration method comprises the following steps:
installing and fixing a sample to be detected on a clamp in a heating furnace;
setting the heating temperature of the heating furnace, and starting the heating furnace to heat the sample to be measured;
after the temperature in the heating furnace is stable, starting a laser light source, a laser transmission system, a two-color system, a radiation light transmission system, a signal acquisition system and a data processing system;
the signal acquisition system acquires the phosphorescence signal radiated by the sample to be detected after being triggered by the laser light source, converts the phosphorescence signal into a digital light intensity signal and transmits the digital light intensity signal into the data processing system;
the data processing system integrates and plots digital light intensity signals of the signal acquisition system in a plurality of laser pulses to generate a spectral characteristic curve of phosphorescence light intensity changing along with wavelength;
the thermocouple arranged on the back of the sample to be detected collects the temperature of the surface of the sample to be detected and sends the temperature to the data processing system;
and the data processing system generates a change curve of the light intensity ratio along with the temperature as a calibration curve according to the temperature and the corresponding spectral characteristic curve.
8. The spectrum-temperature calibration method according to claim 7, wherein the signal acquisition system acquires the phosphorescence signal emitted from the sample to be measured, converts the phosphorescence signal into a digital light intensity signal, and transmits the digital light intensity signal to the data processing system, and specifically comprises:
the signal acquisition system comprises a monochromator, a CCD detector and an acquisition card which are connected in sequence;
the monochromator separates monochromatic light signals with single wavelength from the phosphorescent light signals and inputs the monochromatic light signals to the CCD detector;
the CCD detector converts the monochromatic light signals into analog electric signals and inputs the analog electric signals into the acquisition card; the analog electric signal comprises light intensity information of the monochromatic light signal;
the acquisition card converts the analog electric signal input from the CCD detector into a digital light intensity signal and sends the digital light intensity signal to the data processing system.
9. The method according to claim 8, wherein the data processing system generates a variation curve of the light intensity ratio with temperature as a calibration curve according to the temperature and the corresponding spectral characteristic curve, and specifically comprises:
the data processing system calculates the light intensity ratio corresponding to the spectral characteristic curve;
and the data processing system takes the temperature as an abscissa, the light intensity ratio corresponding to the temperature as an ordinate, and a variation curve of the light intensity ratio with the temperature is generated as the calibration curve.
10. The method for spectrum-temperature calibration according to claim 9, wherein the calculating, by the data processing system, the light intensity ratio corresponding to the spectral characteristic curve specifically comprises:
the data processing system acquires wavelengths corresponding to two peaks on the spectral characteristic curve, wherein the wavelengths are a first wavelength and a second wavelength respectively;
the data processing system calculates a ratio of the first wavelength and the second wavelength as the light intensity ratio.
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