CN109163810B - High-temperature rotor radiation temperature measuring device and method - Google Patents
High-temperature rotor radiation temperature measuring device and method Download PDFInfo
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- CN109163810B CN109163810B CN201811196874.3A CN201811196874A CN109163810B CN 109163810 B CN109163810 B CN 109163810B CN 201811196874 A CN201811196874 A CN 201811196874A CN 109163810 B CN109163810 B CN 109163810B
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- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/0022—Radiation pyrometry, e.g. infrared or optical thermometry for sensing the radiation of moving bodies
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- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
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- G01J2005/0033—Wheel
Abstract
The invention relates to a high-temperature rotor radiation temperature measuring device and a method, wherein the temperature measuring device comprises a closed equipment cabin and a heating furnace, and further comprises: the device comprises a medium-wave thermal imager, a shielding device and a transmission mechanism, wherein a heating furnace is arranged in an equipment cabin, a rotor is arranged in the heating furnace, and a through hole is formed in the wall of the heating furnace, so that the shielding device can enter and exit the heating furnace under the driving of the transmission mechanism; the shielding device is of an inner cavity structure, is positioned between the end surface of the first-stage rotor of the rotor and the furnace wall in the heating furnace and has a gap with the end surface of the first-stage rotor and the furnace wall; the medium wave thermal imager is fixed in the equipment cabin, and a detector probe of the medium wave thermal imager is aligned to the inner cavity of the shielding device; and a waveband selection optical filter is arranged between the detector of the medium wave thermal imager and the imaging lens. The invention can realize the accurate measurement of the temperature field in the process of testing the performance of the engine rotor on the basis of the dual-waveband temperature measurement.
Description
Technical Field
The invention relates to the technical field of non-contact temperature measurement, in particular to a high-temperature rotor radiation temperature measuring device and method.
Background
In the performance test of the engine rotor, the rotor temperature in a high-temperature environment needs to be obtained, and reliable data support is provided for the evaluation of the rotor thermal fatigue test.
At present, there are two temperature measurement methods, contact and non-contact. For an engine rotor rotating at a high speed in a high-temperature environment, the severe working environment of the engine rotor limits the use of the contact temperature measuring sensor. Radiation non-contact temperature measurement well makes up the defects of contact temperature measurement due to the advantages of fast response, long service life, non-contact and the like.
The existing non-contact temperature measurement is to utilize infrared detection equipment with a certain selected waveband to acquire data of infrared radiation characteristics of a target surface, then perform radiometric calibration on the infrared detection equipment to obtain quantitative radiation data of the target, and perform inversion by combining an emissivity value of the target, an atmospheric transmission correction parameter and the like to obtain a real temperature of the target. The method can perform accurate inversion to obtain temperature data only after the emissivity value of the target is accurately measured. However, in practical engineering applications, the emissivity of the target in a high temperature environment is not easily and accurately obtained. Firstly, high-temperature emissivity test equipment is heavy, the test flow is complex, and the test can only be carried out in a laboratory; secondly, the laboratory test results are difficult to characterize the real situation of the material on site in many cases; particularly for the performance test of the high-temperature rotor of the engine, the infrared emissivity of the surface of the rotor can be obviously changed due to the effects of oil pollution, oxidation, dust pollution and the like on the inner surface of the heating furnace, at the moment, the emissivity of the surface of the rotor is equivalent to an unknown quantity, and the real temperature of the rotor cannot be obtained by using the inversion method.
Meanwhile, when the existing non-contact temperature measuring equipment is used for measuring the temperature of the rotor, the measurement result is influenced by the reflection/scattering of the environmental radiation in the high-temperature furnace where the engine rotor is located, and a large error is generated. In this case, the energy received by the thermometric equipment is the result of coupling together the rotor itself and the scattered ambient radiation, and only obtaining the rotor's own radiation is a useful physical quantity to invert the true temperature. Therefore, the existing radiation temperature measurement method can invert accurate temperature data only by effectively removing the radiation of the surrounding environment. This process is difficult to achieve accurately.
Therefore, aiming at the defects, a new temperature measurement idea needs to be adopted to obtain the true temperature of the surface of the rotor, so that the influence caused by the fact that the target spectral emissivity cannot be accurately obtained is effectively avoided, and the accurate measurement of the temperature of the rotor is realized.
Disclosure of Invention
The invention aims to solve the technical problem that the radiation temperature measuring device and method of the high-temperature rotor can not obtain the real temperature of the rotor due to the fact that the surface emissivity of the rotor can not be accurately obtained and the measured radiation energy is influenced by environmental radiation in the existing radiation temperature measuring of the high-temperature rotor.
In order to solve the technical problem, the invention provides a high-temperature rotor radiation temperature measuring device, which comprises a closed equipment cabin and a heating furnace, and further comprises: a medium wave thermal imager, a shielding device and a transmission mechanism,
the heating furnace is arranged in the equipment cabin, the rotor is arranged in the heating furnace, and the wall of the heating furnace is provided with a through hole, so that the shielding device can enter and exit the heating furnace under the driving of the transmission mechanism; the shielding device is of an inner cavity structure, is positioned between the end surface of the first-stage rotor of the rotor and the furnace wall in the heating furnace and has a gap with the end surface of the first-stage rotor and the furnace wall; the medium wave thermal imager is fixed in the equipment cabin, and a detector probe of the medium wave thermal imager is aligned to the inner cavity of the shielding device; and a waveband selection optical filter is arranged between the detector of the medium wave thermal imager and the imaging lens.
In the high-temperature rotor radiation temperature measuring device, the medium-wave thermal imager is arranged in the low-temperature protection cabin, and the low-temperature protection cabin is provided with the detection holes corresponding to the probe of the detector.
In the high-temperature rotor radiation temperature measuring device, the low-temperature protection cabin is provided with a water-cooling interlayer, and the water-cooling interlayer is connected with the circulating refrigeration water tank through a water-cooling pipeline.
In the high-temperature rotor radiation temperature measuring device, the medium-wave thermal imager is a refrigeration type medium-wave thermal imager.
In the high-temperature rotor radiation temperature measuring device, the medium-wave thermal imager is fixed on a track of an equipment compartment through a support.
In the high-temperature rotor radiation temperature measuring device, the shielding device is provided with an additional interlayer, and the additional interlayer is connected with the circulating refrigeration water tank through an additional water cooling pipeline.
In the high-temperature rotor radiation temperature measuring device, the device further comprises a data processing unit for processing the radiation energy data acquired by the thermal imaging medium wave system to obtain the rotor temperature.
In the high-temperature rotor radiation temperature measuring device, the device also comprises a control unit which is used for carrying out transmission control on the transmission mechanism so that the shielding device can periodically enter and exit the heating furnace; and is used for corresponding data acquisition frequency of the thermal infrared imager in control.
The invention also provides a high-temperature rotor radiation temperature measuring method based on the high-temperature rotor radiation temperature measuring device, which comprises the following steps:
setting the movement period of the shielding device, and controlling the transmission mechanism through the control unit to enable the shielding device to enter and exit the heating furnace according to the movement period;
selecting a narrow band for one time of the band selection optical filter, and controlling the thermal medium wave imager to perform data acquisition on the end face of the rotor rotating at high speed corresponding to the motion period through the control unit;
then, selecting a secondary selection narrow band of the band selection optical filter, and controlling the thermal medium wave imager to carry out data acquisition on the end face of the rotor rotating at high speed corresponding to the motion period through the control unit;
the difference range of the longest wavelength and the shortest wavelength of the primary selection narrow band and the secondary selection narrow band is the same; the difference between the longest wavelength and the shortest wavelength of the once-selected narrow band is at most 0.5 mu m; the difference range of the longest wavelength of the primary selection narrow band and the shortest wavelength of the secondary selection narrow band is between 0.3 and 1.5 mu m;
and processing the data acquired by the medium-wave thermal imager by using a data processing unit, calculating the rotor radiation energy acquired corresponding to the primary selected narrow band and the secondary selected narrow band respectively to obtain a radiation energy ratio, and further calculating to obtain the rotor temperature.
In the high temperature rotor radiation thermometry method according to the present invention,
the specific method for processing the data acquired by the thermal imaging system by the data processing unit is as follows:
the data processing unit processes the acquired data to obtain rotor radiation energy corresponding to the once selected narrow waveband
The radiation energy corresponding to the secondarily selected narrow band is
The radiation energy ratio R of the two is as follows:
setting once-selected narrow band lambda1Secondarily selecting a narrow band lambda corresponding to the wavelength range (a, b)2Corresponding to the wavelength range (c, d), there are:
in the formula of1Representing the spectral emissivity of the primary surface of the rotor, epsilon2Representing the spectral emissivity of the secondary surface of the rotor, T representing the temperature of the rotor, c1Denotes a first radiation constant, c2Represents a first radiation constant; a is the lower limit wavelength value of the once selected narrow band, and b is the upper limit wavelength value of the once selected narrow band; c is the lower limit wavelength value of the secondary selection narrow band, d is the upper limit wavelength value of the secondary selection narrow band;
under the conditions of the selected primary selection narrow wave band and the secondary selection narrow wave band, setting the spectral emissivity epsilon of the primary surface of the rotor1And the spectral emissivity epsilon of the secondary surface of the rotor2Similarly, the radiation energy ratio R is then deformed as:
and calculating by adopting a formula of the radiation energy ratio R to obtain the rotor temperature T.
The high-temperature rotor radiation temperature measuring device and the method have the following beneficial effects: in order to solve the problem that the spectral emissivity of the target surface is not easy to accurately obtain, the band selection optical filter is adopted on the medium-wave thermal imager, in the temperature measurement process, two bands can be respectively selected to obtain corresponding radiant energy, and the real temperature of the end face of the primary rotor can be deduced and obtained by calculating according to the ratio of the radiant energy measured twice; the invention effectively avoids the influence brought by the surface spectral emissivity of the rotor in a dual-waveband temperature measurement mode. Meanwhile, in the measuring process of the radiant energy, in order to prevent additional influence caused by coupling of the ambient radiation and the radiation of the rotor, a shielding device is arranged to shield the surrounding environment, so that the influence of the ambient temperature on the thermal medium wave imager in the data acquisition process is small, and the measuring error is further reduced. According to the invention, the wave bands in two-time measurement are reasonably selected according to the dual-wave-band temperature measurement principle and the infrared radiation characteristic of the high-temperature motor rotor, so that the error of the temperature measurement result caused by the change of the surface spectral emissivity of the rotor can be greatly reduced, and the temperature measurement precision is improved.
Drawings
FIG. 1 is an exemplary schematic diagram of a high temperature rotor radiation temperature measurement device according to the present invention;
FIG. 2 is an exemplary schematic view of a medium wave thermal imager disposed within a cryogenic protection chamber, the cryogenic protection chamber being connected to a rail by a support;
FIG. 3 is an exemplary schematic diagram of the connection of the cryopreserved tank to the water cooled piping;
FIG. 4 is an exemplary diagram illustrating a control process of the high temperature rotor radiation temperature measurement method according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In a first embodiment, a first aspect of the present invention provides a high-temperature rotor radiation temperature measuring device, which is shown in fig. 1, and includes a sealed equipment compartment 1 and a heating furnace 2, and further includes: a medium wave thermal imager 4, a shutter 5 and a transmission mechanism 6,
the heating furnace 2 is arranged in the equipment cabin 1, the rotor 3 is arranged in the heating furnace 2, and a through hole is arranged on the wall of the heating furnace 2, so that the shielding device 5 can enter and exit the heating furnace 2 under the drive of the transmission mechanism 6; the shielding device 5 is of an inner cavity structure, and the shielding device 5 is positioned between the end surface of the first-stage rotor of the rotor 3 and the furnace wall in the heating furnace 2 and has a gap with the end surface of the first-stage rotor and the furnace wall; the medium wave thermal imager 4 is fixed in the equipment cabin 1, and a detector probe of the medium wave thermal imager 4 is aligned with an inner cavity of the shielding device 5; and a waveband selection optical filter is arranged between the detector of the medium wave thermal imager 4 and the imaging lens.
The device is used for acquiring the temperature of the end face of the first-stage rotor in the heating furnace 2, and the temperature data cannot be directly acquired, so that the surface temperature of the rotor is obtained by calculation after the radiation energy of the end face of the first-stage rotor is acquired by the medium-wave thermal imager 4. The heating furnace 2 is internally provided with an electric heating wire 2-1, and the rotor 3 is heated at high temperature through the electric heating wire 2-1.
The transmission mechanism 6 may be any driving structure capable of driving the shutter 5 to reciprocate, for example, a motor may be used to realize the reciprocating driving.
The band selection filter is a key component capable of obtaining dual-band data in the disclosure, and the selection of the band can be realized by changing the filter in a mode of rotating the filter wheel. The selection of the filter band requires a reasonable selection in combination with the actual temperature range of the rotor and the radiation peak band thereof, for example: when the working temperature of the rotor is 600-800 ℃, the characteristic is that the radiation peak value is in the wave band range of 3-5 μm of the medium wave, so when the wave band of the optical filter is selected, the selection in the wave band range of 3-5 μm of the medium wave is preferentially considered, and higher signal-to-noise ratio can be obtained; and in the wave band, selecting according to the selection principle of primary narrow wave band selection and secondary narrow wave band selection.
The selection principle of the primary narrow band selection and the secondary narrow band selection is as follows: the difference range of the longest wavelength and the shortest wavelength of the primary selection narrow band and the secondary selection narrow band is the same; the difference between the longest wavelength and the shortest wavelength of the once-selected narrow band is at most 0.5 mu m; the difference range of the longest wavelength of the primary selection narrow waveband and the shortest wavelength of the secondary selection narrow waveband is between 0.3 and 1.5 mu m.
Because the equipment cabin 1 is in a high-temperature environment, in order to ensure accurate measurement of the medium wave thermal imager 4, a black body can be arranged in the equipment cabin 1, and the medium wave thermal imager 4 is calibrated before each use.
The shielding device 5 is used as an environmental radiation control part, effectively shields the radiation of the surrounding environment after entering the heating furnace 2, and is close to the end face of the rotor as much as possible on the premise of not influencing the operation of other mechanisms, but cannot be in contact with the end face of the rotor so as to avoid the influence of the high temperature of the end face of the rotor.
As shown in fig. 2, because the temperature inside the equipment compartment 1 where the medium wave thermal imager 4 operates is 100 ℃ and the low pressure is 100Pa, in order to ensure that the thermal imager can operate normally, the medium wave thermal imager 4 needs to be specially protected, for example, the medium wave thermal imager 4 may be disposed inside the low-temperature protection compartment 8, and the low-temperature protection compartment 8 is provided with a detection hole corresponding to the position of the detector probe. The low-temperature protection cabin 8 is adopted to provide a reliable working environment for the medium-wave thermal imager 4, and the accuracy of a test result can be improved.
Still further, with reference to fig. 3, a specific method for realizing the low-temperature environment in the low-temperature protection cabin 8 may be:
and a water-cooling interlayer is arranged on the side wall of the low-temperature protection cabin, and then the water-cooling interlayer is connected with a circulating refrigeration water tank through a water-cooling pipeline 11. The circulating refrigeration water tank can be arranged outside the equipment cabin 1 and provides a refrigeration water source for the water-cooling interlayer.
In parallel with the low-temperature protection cabin 8, the medium-wave thermal imager 4 can be a refrigeration type medium-wave thermal imager, and then the stable operation in the high-temperature environment is ensured by utilizing the refrigeration function of the medium-wave thermal imager.
As an example, as shown in connection with fig. 2, the thermal medium wave imager 4 may be fixed on a rail 10 of the equipment bay 1 by means of a bracket 9. The medium wave thermal imager 4 is arranged at a fixed position in the equipment cabin 1, a detector probe of the medium wave thermal imager needs to acquire data of the end face of the rotor through an interference-free environment isolated by an inner cavity of the shielding device 5, and the fixed mode and the position of the medium wave thermal imager can just correspond to the position of the shielding device 5.
As an example, in connection with fig. 3, in order to avoid introducing new radiation disturbances into the furnace 2, the shutter 5 needs to be kept relatively low temperature entry. The shielding device 5 may be water-cooled, for example, an additional interlayer is disposed on the side wall of the shielding device 5, and the additional interlayer is connected to the circulating cooling water tank through an additional water-cooling pipeline, so as to form a circulating cooling channel with the external circulating cooling water tank. The shielding device 5 and the low-temperature protection cabin 8 can adopt the same refrigeration principle, for example, the two can be respectively connected with an external circulating refrigeration water tank through pipelines to realize synchronous refrigeration. The water-cooling design of the shielding device 5 may be such that a water tank is formed inside and connected to the circulating cooling water tank through a hose.
As an example, the shutter 5 may be made of a copper alloy.
As an example, as shown in fig. 4, since the direct measurement data of the radiation thermometry device in the present disclosure is the radiation energy of the rotor end face, which is not the temperature data to be finally obtained, the data needs to be subsequently processed to obtain the rotor temperature. For example, a data processing unit may be used to process the radiation energy data acquired by the thermal imaging medium 4 to obtain the rotor temperature. The data processing unit may be embedded in a computer, as shown in fig. 1, and the data processing unit receives data output by the thermal medium wave imager 4 through a data transmission line and then processes the data. The data transmission lines and power lines of various parts in the equipment cabin 1 can pass through the equipment cabin 1 from inside to outside through flanges 7 arranged on the cabin wall of the equipment cabin 1.
As an example, referring to fig. 4, the apparatus further includes a control unit for controlling the transmission mechanism 6 to periodically move the shutter 5 into and out of the heating furnace 2; and is used to correspond to the data acquisition frequency of the thermal imager 4 under control.
The data processing unit processes the data as follows:
firstly, combining with Planck's formula, the radiation energy M of target at temperature T and wavelength lambda can be calculatedλ：
Where ε is the spectral emissivity of the target surface, c1Is the first radiation constant, c2Is a second radiation constant;
if two different wavelengths are selected, the mathematical expression of the radiation energy ratio corresponding to the two wavelengths is as follows:
in practical situations, due to the spectral continuity, infrared light of a single wavelength cannot be obtained even if an optical filter is selected, and therefore, a narrow-band optical filter is selected, so that radiation energy in a band as narrow as possible reaches the thermal medium-wave imager 4. And (3) calculating the total radiation energy in the narrow bands (a, b), (c, d) by adopting an energy integration theory, wherein the energy ratio mathematical expression is as follows:
in the invention, because the two selected wave bands (a, b), (c, d) are very close, the average surface spectral emissivity in the difference value Delta lambda of the two narrow wave bands can be considered to be almost the same, the atmospheric attenuation is basically the same, and the radiation energy ratio can not be influenced, namely, the epsilon can be considered at the moment1(λ1，T)＝ε2(λ2T), and obtaining the energy ratio expression as follows:
the rotor temperature T can be obtained by the functional relation between the radiation energy ratio R and the rotor temperature T and by derivation of the formula.
After the temperature measuring device disclosed by the invention is used for carrying out data test on the corresponding position of the end face of the rotor, the radial temperature distribution of the end face of the first-stage rotor can be obtained through data processing and temperature inversion, and reliable temperature data support can be provided for the thermal fatigue test process of the engine rotor.
In a second embodiment, as shown in fig. 4, another aspect of the present invention further provides a high-temperature rotor radiation temperature measurement method based on the high-temperature rotor radiation temperature measurement device, including:
setting the movement period of the shielding device 5, and controlling the transmission mechanism 6 through the control unit to enable the shielding device 5 to enter and exit the heating furnace 2 according to the movement period;
selecting a narrow band for one time of the band selection optical filter, and controlling the thermal medium wave imager 4 to collect data of the end face of the rotor rotating at high speed corresponding to the motion period through the control unit;
then, selecting a secondary selection narrow band of the band selection optical filter, and controlling the thermal medium wave imager 4 to acquire data of the end face of the rotor rotating at a high speed corresponding to the motion period through the control unit;
the selection principle of the primary narrow band selection and the secondary narrow band selection is as follows: the difference range of the longest wavelength and the shortest wavelength of the primary selection narrow band and the secondary selection narrow band is the same; the difference between the longest wavelength and the shortest wavelength of the once-selected narrow band is at most 0.5 mu m; the difference range of the longest wavelength of the primary selection narrow band and the shortest wavelength of the secondary selection narrow band is between 0.3 and 1.5 mu m;
for example, the following steps are carried out: assuming that the working temperature of the rotor is 600-800 ℃, the characteristic is that the radiation peak value is in the wave band range of 3-5 μm of the medium wave, the first selected narrow wave band can be selected to be 3-3.5 μm, the second selected narrow wave band can be selected to be 4-4.5 μm, and the difference value between the longest wavelength of the first selected narrow wave band and the shortest wavelength of the second selected narrow wave band is 0.5 μm.
And processing the data acquired by the thermal imaging system 4 by using a data processing unit, calculating the radiation energy ratio by using the rotor radiation energy acquired respectively corresponding to the primary selected narrow band and the secondary selected narrow band, and further calculating to acquire the rotor temperature.
In the actual use process of the present embodiment, even if the optical filter is selected, the infrared light with a single wavelength cannot be obtained due to the spectral continuity, so the narrow-band optical filter is selected. For the subsequent calculation requirements, the wavelength ranges of the primary narrow band and the secondary narrow band are closer to each other, so that the accuracy of the calculation process is not affected.
The shielding device 5 periodically enters and exits the heating furnace 2, so that the spaced shielding of the environmental radiation in the equipment cabin 1 is realized, and the modulation of the rotor radiation signal is realized, namely when the shielding device 5 enters the heating furnace 2, the medium wave thermal imager 4 obtains an effective test signal, when the shielding device 5 moves out of the heating furnace 2, the signal obtained by the medium wave thermal imager 4 contains the environmental radiation signal, and the screening can be performed according to the movement period when the data processing is performed.
In the embodiment, the calculation can be performed only by selecting the data acquired by the medium wave thermal imager 4 corresponding to the narrow band for one time and the data acquired by the medium wave thermal imager 4 corresponding to the narrow band for the second time according to at least two test results, and finally the rotor temperature is obtained.
Still further, as an example, a specific method for processing the data acquired by the thermal medium wave imager 4 by the data processing unit is as follows:
the data processing unit processes the acquired data to obtain rotor radiation energy corresponding to the once selected narrow waveband
The radiation energy corresponding to the secondarily selected narrow band is
The radiation energy ratio R of the two is as follows:
setting once-selected narrow band lambda1Secondarily selecting a narrow band lambda corresponding to the wavelength range (a, b)2Corresponding to the wavelength range (c, d), there are:
in the formula of1Representing the spectral emissivity of the primary surface of the rotor, epsilon2Representing the spectral emissivity of the secondary surface of the rotor, T representing the temperature of the rotor, c1Denotes a first radiation constant, c2Represents a first radiation constant; a is the lower limit wavelength value of the once selected narrow band, and b is the upper limit wavelength value of the once selected narrow band; c is the lower limit wavelength value of the secondary selection narrow band, d is the upper limit wavelength value of the secondary selection narrow band;
under the condition of the selected primary selection narrow band and the secondary selection narrow band, because the two selected bands are very close, the average surface spectral emissivity in the narrow band delta lambda is almost the same, the atmospheric attenuation is basically the same, the ratio cannot be influenced, and the primary surface spectral emissivity epsilon of the rotor at the moment can be considered to be the same1And the spectral emissivity epsilon of the secondary surface of the rotor2Similarly, the radiation energy ratio R is then deformed as:
the radiant energy ratio R is obtained from the radiant energy data collected by the medium wave thermal imager 4, and then the rotor temperature T is obtained by calculating according to the formula.
In conclusion, on the basis of dual-band temperature measurement, the problem that environmental radiation scattering influences temperature measurement precision in traditional radiation temperature measurement is solved, accurate measurement of a temperature field in the performance test process of an engine rotor can be achieved, and reliable temperature data support is provided for thermal fatigue test evaluation.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. The utility model provides a high temperature rotor radiation temperature measuring device, includes inclosed equipment cabin (1) and heating furnace (2), its characterized in that still includes: a medium wave thermal imager (4), a shielding device (5) and a transmission mechanism (6),
the heating furnace (2) is arranged in the equipment cabin (1), the rotor (3) is arranged in the heating furnace (2), and a through hole is arranged on the wall of the heating furnace (2), so that the shielding device (5) can be driven by the transmission mechanism (6) to enter and exit the heating furnace (2); the shielding device (5) is of an inner cavity structure, and the shielding device (5) is positioned between the end surface of the first-stage rotor of the rotor (3) and the furnace wall in the heating furnace (2) and has a gap with the end surface of the first-stage rotor and the furnace wall; the shielding device (5) is provided with an additional interlayer, and the additional interlayer is connected with the circulating refrigeration water tank through an additional water cooling pipeline; the medium wave thermal imager (4) is fixed in the equipment cabin (1), and a detector probe of the medium wave thermal imager (4) is aligned to an inner cavity of the shielding device (5); a waveband selection optical filter is arranged between a detector of the medium wave thermal imager (4) and the imaging lens; the medium-wave thermal imager (4) is arranged in the low-temperature protection cabin (8), and the low-temperature protection cabin (8) is provided with a detection hole corresponding to the position of the detector probe;
the device also comprises a data processing unit, a data processing unit and a data processing unit, wherein the data processing unit is used for processing the radiation energy data acquired by the medium wave thermal imager (4) to obtain the temperature of the rotor;
the device also comprises a control unit, which is used for carrying out transmission control on the transmission mechanism (6) so that the shielding device (5) can periodically enter and exit the heating furnace (2); and is used for corresponding to the data acquisition frequency of the thermal infrared imager (4) in control.
2. The high temperature rotor radiation temperature measuring device of claim 1, wherein: the low-temperature protection cabin is provided with a water-cooling interlayer, and the water-cooling interlayer is connected with the circulating refrigeration water tank through a water-cooling pipeline (11).
3. The high temperature rotor radiation temperature measuring device of claim 1, wherein:
the medium wave thermal imager (4) is a refrigeration type medium wave thermal imager.
4. A high temperature rotor radiation thermometric apparatus according to any one of claims 1 to 3, wherein: the medium wave thermal imager (4) is fixed on a track (10) of the equipment cabin (1) through a support (9).
5. A high-temperature rotor radiation temperature measurement method based on the high-temperature rotor radiation temperature measurement device of claim 1, which is characterized by comprising the following steps:
setting the movement period of the shielding device (5), and controlling the transmission mechanism (6) through the control unit to enable the shielding device (5) to enter and exit the heating furnace (2) according to the movement period;
selecting a narrow band for one time of the band selection optical filter, and controlling a thermal medium wave imager (4) to acquire data of the end face of the rotor rotating at a high speed corresponding to the motion period through the control unit;
then, selecting a secondary selection narrow band of the band selection optical filter, and controlling a medium-wave thermal imager (4) to acquire data of the end face of the rotor rotating at a high speed corresponding to the motion period through the control unit;
the difference range of the longest wavelength and the shortest wavelength of the primary selection narrow band and the secondary selection narrow band is the same; the difference between the longest wavelength and the shortest wavelength of the once-selected narrow band is at most 0.5 mu m; the difference range of the longest wavelength of the primary selection narrow band and the shortest wavelength of the secondary selection narrow band is between 0.3 and 1.5 mu m;
and processing the data acquired by the medium wave thermal imager (4) by using a data processing unit, calculating the radiation energy ratio by using the rotor radiation energy acquired respectively corresponding to the primary selected narrow band and the secondary selected narrow band, and further calculating to obtain the rotor temperature.
6. The method for measuring the temperature of the high-temperature rotor by radiation according to claim 5, wherein:
the specific method for processing the data collected by the medium wave thermal imager (4) by the data processing unit is as follows:
the data processing unit processes the acquired data to obtain rotor radiation energy corresponding to the once selected narrow waveband
The radiation energy corresponding to the secondarily selected narrow band is
The radiation energy ratio R of the two is as follows:
setting once-selected narrow band lambda1Secondarily selecting a narrow band lambda corresponding to the wavelength range (a, b)2Corresponding to the wavelength range (c, d), there are:
in the formula of1Representing the spectral emissivity of the primary surface of the rotor, epsilon2Representing the spectral emissivity of the secondary surface of the rotor, T representing the temperature of the rotor, c1Denotes a first radiation constant, c2Represents a first radiation constant; a is the lower limit wavelength value of the once selected narrow band, and b is the upper limit wavelength value of the once selected narrow band; c is the lower limit wavelength value of the secondary selection narrow band, d is the upper limit wavelength value of the secondary selection narrow band;
setting the primary surface spectral emission of the rotor under the selected primary and secondary selection narrow wave bandsRefractive index epsilon1And the spectral emissivity epsilon of the secondary surface of the rotor2Similarly, the radiation energy ratio R is then deformed as:
and calculating by adopting a formula of the radiation energy ratio R to obtain the rotor temperature T.
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| CN113686450B (en) * | 2021-09-03 | 2023-08-01 | 合肥师范学院 | High-temperature target surface temperature measuring instrument convenient for temperature inspection in furnace |
| CN114323098A (en) * | 2021-12-21 | 2022-04-12 | 北京科技大学 | Space protection cabin detection system and detection method |
| CN114320989B (en) * | 2021-12-31 | 2022-12-02 | 北京中科科仪股份有限公司 | Molecular pump temperature measuring device, temperature measuring method and temperature measuring device of running part |
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