JP2009122050A - Method and device for measuring object to be measured - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for measuring an object to be measured capable of accurately measuring the distribution of the temperature and/or the pressure of the object to be measured, and to provide a device thereof. <P>SOLUTION: This method for measuring an object to be measured comprises a stage for sensing, by means of an infrared light sensing means 30, infrared light which is radiated from an object 10 to be measured and is reflected by a mirror 20, disposed on a portion around the object 10. The method, further, comprises a stage for calculating the distribution of the temperature and/or pressure of the object 10, based on the infrared light detected. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a measuring object measuring method and apparatus, and more particularly to a measuring object measuring method and apparatus for measuring a temperature or / and pressure distribution of a gas as a measuring object.

  It is important to develop a method for measuring the temperature and pressure distribution of a measurement object, for example, a gas sealed in a container, from the outside without contacting the container. For example, an airbag used in an automobile is expanded and contracted in a short time of about 200 ms, and it is difficult to directly measure the temperature and pressure distribution inside because the deployment involves a large impact. It is. Therefore, in the case of a device such as an air bag that cannot directly measure the temperature and pressure of the container, it is desired to measure it from the outside without contact.

In general, as a method of measuring a distribution such as a three-dimensional distribution of the temperature of combustion gas in a container such as an air bag, an infrared ray radiated from the combustion gas (for example, carbon dioxide gas) and transmitted through the container such as an air bag is used. A method for measuring the intensity and measuring the temperature distribution of the gas in the airbag is known (see, for example, Patent Document 1).
JP 2006-292433 A

  However, the conventional method for measuring the three-dimensional distribution of the temperature of the gas has a problem that it requires a plurality of infrared cameras and is expensive and not economical. In addition, it is necessary to secure a place for installing a plurality of infrared cameras, and there is a problem that a measurement place is limited.

  An object of the present invention is to solve the above-mentioned problems and to provide a measuring object measuring method and apparatus capable of accurately measuring the three-dimensional distribution of temperature and pressure of combustion gas.

  The above object of the present invention is achieved by the following means.

  In the measuring object measuring method of the present invention, an infrared ray radiated from a measuring object and reflected by a mirror disposed around the measuring object is sensed by an infrared sensing means, and the measuring object is based on the sensed infrared ray. It is characterized by calculating the temperature or / and pressure distribution of the object.

  The measuring object measuring apparatus of the present invention is based on a mirror disposed around the measuring object, an infrared detecting means for detecting infrared light emitted from the measuring object and reflected by the mirror, and the detected infrared light. And calculating means for calculating the temperature or / or pressure distribution of the measurement object.

  According to the present invention, a distribution such as a three-dimensional distribution of pressure and temperature of combustion gas can be accurately measured.

  Hereinafter, a measuring object measuring method and apparatus according to the present invention will be described in detail with reference to the drawings. In each embodiment of the present invention, an air bag is taken as an example of an object to be measured, and the three-dimensional distribution of pressure and temperature of carbon dioxide gas that is combustion gas in the air bag is measured.

<First Embodiment>
The measurement object measuring apparatus of the present embodiment uses a mirror disposed around the measurement object and a single infrared camera, and uses the infrared radiation two-color CT method to measure the temperature and pressure in the measurement object. The distribution is measured.

  FIG. 1 is a diagram illustrating a schematic configuration of a measurement object measuring apparatus according to the present embodiment. FIG. 2 is a cross-sectional view taken along line AA in FIG.

  The measurement object measuring apparatus according to the present embodiment images an airbag 10 containing a combustion gas as a measurement object, a mirror 20 disposed around the airbag 10, and infrared rays emitted from the combustion gas 1 And a rotary chopper 40 provided with a filter for passing infrared rays in two wavelength regions, and a computer 50 for calculating infrared intensity and pressure / temperature of combustion gas.

  The airbag 10 is formed of a fabric having uniform air permeability, and the inside thereof is filled with carbon dioxide gas (hereinafter simply “gas”). It is known from experiments that the fabric of the airbag 10 transmits infrared rays. Although not shown, the airbag 10 is provided with an inflator, which is a gas injection device. The gas is filled in the cylindrical cover by the operation of the inflator, and the airbag 10 is instantly developed.

  As shown in FIGS. 1 and 2, the mirror 20 reflects infrared rays transmitted from the airbag 10 and is disposed around the airbag 10. In the present embodiment, eleven plane mirrors 20 are arranged around the airbag 10 at equal intervals. The mirror 20 is not limited to eleven plane mirrors. The number of plane mirrors or the shape of the mirror 20 itself is appropriately determined depending on the size of the airbag 10, the position of an infrared camera to be described later, and the geometric properties such as the maximum viewing angle. Can be changed. In addition, the mirror 20 can also be made into a conical mirror, a parabolic mirror, or a spherical mirror as shapes other than a several plane mirror, for example, as shown in FIGS.

  The infrared camera 30 senses infrared rays and images them, and functions as an infrared sensing means. The infrared camera 30 inputs infrared rays in a specific infrared absorption spectrum band emitted through the fabric of the airbag 10 as an image. Image data input by the infrared camera 30 is sent to the computer 50. Here, the specific infrared absorption spectrum band means that the gas enclosed in the airbag 10 is carbon dioxide, so that the relative energy of carbon dioxide is high, and it is convenient for measuring the temperature distribution. For example, the absorption spectrum band is 4.3 μm. The optical axis of the infrared camera 30 is preferably placed at a position passing through the center of the airbag 30. Since the configuration of the infrared camera 30 is the same as that of a general infrared camera, detailed description thereof is omitted. In the present embodiment, an infrared camera is used as an example of infrared detecting means for detecting infrared rays. However, the present invention is not limited to this, and an infrared sensor capable of detecting infrared rays can be used instead.

  As shown in FIG. 1, the rotary chopper 40 is attached to the infrared camera 30, and includes a first filter 41 that passes an infrared first wavelength band and a second filter 42 that passes an infrared second wavelength band. And a disk-shaped structure in which the and are alternately attached in the rotation direction. The rotating chopper 40 rotates in synchronization with the timing at which infrared rays are sensed, that is, the shutter speed of the infrared camera 30, and picks up infrared rays while switching between the first filter 41 and the second filter 42. Although FIG. 1 shows an example in which there are two regions of the first filter and two regions of the second filter, the present invention is not limited to this, and the number and shape of each filter in the region may be changed as appropriate. Can do.

  The computer 50 calculates a three-dimensional distribution of infrared intensity based on the imaging result captured by the infrared camera 30 and calculates a three-dimensional distribution of gas pressure and temperature from the calculated three-dimensional distribution of infrared intensity. And it is an information processing device. The computer 50 can also control the infrared camera 30 and the rotating chopper 40 at the same time.

  The computer 50 includes components such as a central processing unit (CPU) composed of a microprocessor, a ROM memory, a RAM memory, a nonvolatile memory, and a communication interface coupled to the CPU. In the ROM memory, for example, a program for executing an infrared radiation two-color CT method is stored. The RAM memory is used for temporary storage of data for processing executed by the CPU. The nonvolatile memory stores various set values necessary for calculating the three-dimensional portion of the gas pressure and temperature, such as data representing the relationship between the temperature of infrared rays emitted by carbon dioxide and the radiation intensity. The communication interface connects the infrared camera 30 and the computer 50 so that they can communicate with each other.

  Further, the computer 50 functions as an infrared intensity calculating means for calculating the following three-dimensional distribution of infrared intensity.

  The infrared intensity calculating means calculates a three-dimensional distribution of infrared intensity based on the imaging result captured by the infrared camera 30. That is, when calculating the three-dimensional image from the two-dimensional images reflected on the plurality of mirrors 20, the infrared intensity calculating means uses a coordinate transformation formula corresponding to the arrangement and shape of the mirror 20 to calculate CT (computerized tomography). It is possible to obtain a three-dimensional distribution of infrared intensity expressed in a cylindrical coordinate system necessary for calculation. Further, the infrared intensity calculating means of the present embodiment calculates the three-dimensional distribution of each infrared ray in the first wavelength region and the second wavelength region of the infrared imaged through the first filter and the second filter of the rotary chopper 40. To do. The calculation method for acquiring the three-dimensional distribution can be calculated by a conventionally known geometric method such as vector analysis, and thus a detailed description thereof is omitted. Further, when calculating the infrared intensity, it is assumed that the transmittance of infrared rays through the fabric of the airbag 10 is taken into account, and this transmittance is the same as the conventional one, and thus detailed description thereof is omitted.

  Further, the computer 50 functions as a pressure / temperature calculating means for calculating a three-dimensional distribution of gas pressure and temperature as follows.

  The pressure / temperature calculating means calculates a three-dimensional distribution of gas pressure and temperature from the calculated three-dimensional distribution of infrared intensity. Specifically, the pressure / temperature calculating means calculates the pressure and temperature of the gas in the airbag 10 using the infrared radiation two-color CT method. A detailed calculation method of the gas pressure and temperature will be described later.

  Here, the infrared radiation two-color CT method will be briefly described.

  In general, the intensity of the infrared radiation emitted by a gas is a function of the temperature and concentration of the gas. Therefore, it is not possible to separate the temperature and the concentration from only the infrared intensity measured in one wavelength range. The intensity can be used to identify the temperature of the gas that is not affected by concentration.

FIG. 6 shows a conceptual diagram of a measuring apparatus using a general CT method. The calculation region 1 and the gas 2 to be measured are fixed to a stationary coordinate system (xy), and the optical system is fixed to a rotating coordinate system (XY). FIG. 6 shows a state in which the optical axis of the thermometer (parallel to the Y axis) is rotated by θ with respect to the xy coordinate system. After scanning this axis along the X axis, the light is projected to the next projection angle. Rotate the shaft. The radiation energy emitted from the gas 2 reaches the spectroscope 5 while receiving absorption (self-absorption) of the gas in the middle, and after wavelength separation in the first wavelength region and the second wavelength region, detection for each wavelength. Enter into vessel 6. Infrared measurement is performed at various angles θ (the number is the number of projections) and position X (the number is the number of samplings), and the detector is detected along the optical axis of the wavelength ω at the angle θ and the position X. The integral amount of radiation energy incident on the _{light beam} , so-called projection data P _xθ1 and P _xθ2 can be obtained.

FIG. 7 shows the product of the infrared absorption coefficient a _ω (T) [atm ⁻¹ cm ⁻¹ ] of the 4.3 μm band of carbon dioxide and the radiation intensity I _Gω [Wcm ⁻¹ ] of the black body, with the temperature as a parameter. FIG. This value is the energy emitted by the minute gas mass per unit pressure and unit volume, and is an important factor in the infrared radiation two-color CT method. In the figure, Δω1 indicated by an arrow is the first wavelength region, Δω2 is the wavelength width of the second wavelength region, and the center wave number is ωc. Assuming that the infrared absorption coefficient a _{ω in} each wavelength region and the radiation intensity of the black body is I _ω , the infrared radiation two-color CT method uses the radiation intensities a ₁ I ₁ and a ₂ I ₂ obtained from these two wavelength regions. The ratio R can be expressed by the following formula (1).

Therefore, the infrared radiation two-color CT method is a method in which the relationship between R and temperature T is examined in advance and the temperature is determined by comparison with actual measurement values. FIG. 8 shows R as a function of temperature T (K) when ωc = 2200 cm ⁻¹ , Δω1 = 50 cm ⁻¹ , and Δω2 = 50 cm ⁻¹ . If the local R in the gas is measured according to FIG. 8, the temperature T is uniquely determined.

  The measuring object measuring apparatus of the present embodiment configured as described above performs processing as follows.

  FIG. 9 is a flowchart showing an example of processing contents of the measuring object measuring apparatus of the present embodiment. In the processing shown below, self-absorption where carbon dioxide absorbs infrared rays is not considered.

  As shown in FIG. 9, in the measurement object measuring method in the present embodiment, first, infrared rays in the first wavelength region and the second wavelength region are imaged by the infrared camera 30 (step S100). In order to obtain the infrared intensities in the two wavelength regions used in the infrared radiation two-color CT method, the rotary chopper 40 attached to the infrared camera 30 is rotated in synchronization with the shutter speed of the infrared camera 30, and the first filter 41 and An infrared image is captured while switching the second filter 42. Note that the computer 50 can play a role in controlling the infrared camera 30 and the rotating chopper 40, for example.

Next, projection data P _xθ1 and P _xθ2 in the first wavelength region and the second wavelength region are obtained from the imaging result _captured by the infrared camera 30 using the infrared radiation two-color CT method (step S110).

Next, radiation energy S _xθ1 and S _xθ2 per unit volume is _calculated from the projection data P _xθ1 and P _xθ2 using the following formula (2) (step S120).

Next, the ratio R of the calculated radiation energy S _xθ1 and S _xθ2 per unit volume is calculated by the following equation (3) (step S130).

  Next, the temperature T is calculated by comparing the actually calculated ratio R of the radiation energy with the relationship between R and the temperature T prepared in advance (the relationship shown in FIG. 9) (step S140). The temperature T of carbon dioxide can be generally expressed as a function of the ratio R of radiation energy as shown in the following formula (4).

Next, the gas pressure P can be calculated from the calculated radiation energy per unit volume S _xθ1 , S _xθ2 and the temperature T using the following equation (5) (step S150).

Therefore, the three-dimensional distribution of gas pressure and temperature can be calculated by _{obtaining the} pressure and temperature from the projection data P _xθ1 and P _{xθ2 on} the optical axis of the wavelength ω at various angles θ and position X.

  As described above, according to the measurement object measuring method of the present embodiment, the following effects can be obtained.

  (A) The temperature / pressure distribution of the object can be calculated by disposing a mirror around the object to be measured and providing infrared sensing means only in a specific direction.

  (B) In addition, by arranging a mirror around the measurement object, the temperature of the combustion gas as the object can be measured using the infrared radiation two-color CT method only by photographing once with only one infrared camera.・ Distribution such as three-dimensional pressure distribution can be measured.

  (C) By using an infrared camera as the infrared sensing means, the imaging result is displayed on the display device, so that the distribution of the infrared intensity can be easily grasped visually.

  (D) By sensing a plurality of infrared wavelength regions through a plurality of filters, it is not necessary to use an infrared camera for sensing each of the plurality of wavelength regions, and radiation from a measurement object with one infrared camera. Can detect infrared rays.

  (E) By imaging infrared rays through a first filter that passes the first wavelength region of infrared rays and a second filter that passes the second wavelength region, two wavelengths (4.3 μm, 2.. It is not necessary to prepare an infrared camera capable of simultaneously imaging the 7 μm band), and infrared rays in the two wavelength regions can be easily imaged.

  (F) The rotating chopper rotates in synchronization with the shutter speed of the infrared camera, and picks up infrared rays while switching between the first filter and the second filter. When the infrared radiation two-color CT method is used with one infrared camera, it is necessary to switch the filter for each photographing, but by rotating the rotating chopper in synchronization with the shutter speed of the infrared camera, the filter High-speed shooting is possible while switching.

  (G) By using a plurality of plane mirrors as a mirror, three-dimensional CT can be easily realized with one infrared camera. In addition, by using any one of a conical mirror, a parabolic mirror, and a spherical mirror as a mirror, for example, if the measurement object is spherical, a plurality of plane mirrors are arranged around the measurement object. In comparison, three-dimensional CT can be realized easily and stably with a single infrared camera.

<Second Embodiment>
Next, the measuring object measuring method of the second embodiment of the present invention will be described in detail.

  Unlike the first embodiment, the measurement object measuring method of the second embodiment is calculated in consideration of the fact that infrared rays are self-absorbed by the CO2 gas in the airbag.

Hereinafter, a different point from the first embodiment, that is, a method for calculating the radiation energy S _xθ1 and S _xθ2 per unit volume will be described in detail.

Considering that the infrared rays are self-absorbed by the gas in the airbag, the formula (2) used in the first embodiment is replaced with the following formula (6). Here, _fθω represents the ratio of energy absorbed in the gas (<0).

S _xθω and f _θω in Expression (6) are expressed by a differential term of pressure P _xy , blackbody radiation intensity I _ωT and absorption coefficient ε, and are solved by a nonlinear least square method.

P _xθ is obtained from infrared projection data, and a _ω (T _xy ), c (T _xy ), and I _Gω are obtained using a library such as a calculation code RADCAL, for example. By using Equation (7) as a calculation formula of the nonlinear term and solving the simultaneous equations of Equation (8) that is reduced to the least square method using the Levenberg-Marquart method, the temperature that is an unknown constant of each pixel is obtained. The pressure can be derived.

  As described above, according to the measuring object measuring method of the second embodiment, the following effect (h) is obtained in addition to the effects (a) to (g) of the first embodiment.

(H) The self-absorption due to the infrared combustion gas is corrected, and there is no problem of divergence such as convergence calculation, and the temperature and pressure of the measurement object can be accurately measured.
<Third Embodiment>
Next, the measuring object measuring method of the third embodiment of the present invention will be described in detail.

  The measurement object measuring method according to the present embodiment realizes a three-dimensional CT from a projection image reflected on a finite number of mirrors, and therefore a finite series, for example, a Zernike series expansion, for a three-dimensional distribution of temperature and pressure. To reduce the number of solutions to be solved and solve the above nonlinear equation.

  Hereinafter, a method for calculating temperature and pressure by performing Zernike series expansion as an example of a finite series for a three-dimensional distribution of temperature and pressure, which is different from the second embodiment, will be described in detail.

When the airbag 10, the plane mirror 20, and the infrared camera 30, which are measurement objects, are arranged as shown in FIG. 10, a complete side projection view of the measurement object appears in the infrared camera 30. That is, infrared projection data P _xθ on the tomographic plane in the plan view of the airbag 10 is obtained as it is.

  In order to solve the simultaneous equations of Equation (8) by the least square method, 2 (Nx × Ny) infrared cameras (number of mirrors) are required. Here, Nx is the length per pixel and element length in the X-axis direction, and Ny is the length per pixel and element length in the Y-axis direction.

  Therefore, in the measurement object measuring method of this embodiment, a Zernike series expansion is performed on the three-dimensional distribution of temperature and pressure, and the number of solutions to be obtained is reduced, so that a finite number (at most a dozen or so) plane mirrors. Another object is to obtain a three-dimensional distribution of pressure and temperature from an infrared camera image. Furthermore, an initial value is set with an average value obtained on the assumption that the pressure and temperature distribution is uniform, thereby suppressing the occurrence of a local solution.

  Hereinafter, the reason why the Zernike series expansion is performed and a continuous three-dimensional distribution can be obtained with at most a dozen mirrors will be described. The physical quantity distribution φ to be identified is developed into a Zernike polynomial as shown in the following formula (9).

Here, r and θ represent polar coordinate components in a two-dimensional space. W _j is a Zernike basis function, and z _j is a Zernike coefficient. In Expression (9), the first-order and higher-order terms are ignored, and the vector expression of the distribution of the physical quantity to be identified is Expression (10) below.

  Here, [W] is a matrix in which vectors obtained by discretizing Zernike basis functions are arranged horizontally. Z is a vector composed of one Zernike coefficient. In this embodiment, when the distribution of the physical quantity to be identified is smooth, the higher order terms after the first order are ignored, and the distribution is expressed by about 30 to 70 terms of the lower order Zernike series. That is, when the distribution is expanded to a low-order Zernike series, the distribution can be obtained simply by identifying 30 to 70 unknowns. In the present invention, the physical quantity at each discretized point is not directly identified, but the distribution is expanded in series, for example, expanded in a low-order series as shown in Equation (10), and a small number of expansion coefficients are set. I try to identify.

  That is, in this embodiment, the design variable is a series expansion coefficient (Zernike coefficient in this example), and a nonlinear optimization problem having an evaluation function expressed by Equation (11) (hereinafter also referred to as a second nonlinear optimization problem). The distribution of the physical quantity to be identified is identified by solving the second nonlinear optimization problem. Thereby, the solution of the second nonlinear optimization problem can be obtained accurately and stably, and the amount of calculation can be greatly reduced.

Here, for example, without using the method of the present embodiment, if the design variables are T _xy and p _xy and the nonlinear optimization problem having the evaluation function expressed by the following equation (12) is solved, each point It is necessary to identify the temperature T _xy and the pressure p _xy at.

  For example, even when the distribution of the temperature T and the pressure p is identified with a coarse resolution of 30 × 30, the unknown to be identified is twice the target number n, and 2n = 30 × 30 × 2 = 1800. In such a case, the nonlinear minimization problem having the evaluation function expressed by the mathematical formula (12) becomes an unfavorable condition, resulting in a problem that the solution is not stable or the calculation amount is enormous. In the present embodiment, the case where the temperature / pressure distribution is expanded in the Zernike series as an example of a finite series has been described. It goes without saying that series expansion, expansion by a spline function, or expansion by a Bessel function can be used.

  As described above, according to the measuring object measuring method of the third embodiment, in addition to the effects (a) to (g) of the first embodiment, the following effects can be obtained.

  (I) Three-dimensional CT can be realized from projection data of a finite number of plane mirrors.

  The preferred embodiments of the present invention have been described above. However, the present invention should not be limited to the above embodiments, and does not depart from the spirit and scope expressed in the claims. Various modifications, additions, and omissions are possible by those skilled in the art.

  For example, in the present embodiment, a method of measuring the temperature or / and pressure of a measurement object using one infrared camera and a rotating chopper has been described as an example. However, the present invention is not limited to this, and different infrared wavelengths are used. By preparing a plurality of infrared cameras equipped with filters that pass through the region, the temperature or / and pressure of the measurement object can be measured.

  In the present embodiment, the case where infrared rays in the first wavelength region and the second wavelength region are acquired by an infrared camera in the 4.3 μm band using a rotating chopper has been described as an example. Of course, this can be done with one infrared camera capable of simultaneously imaging two wavelengths (4.3 μm and 2.7 μm bands).

  Furthermore, as in the present embodiment, it is desirable to use a rotating chopper for high-speed imaging, but the present invention is not limited to this. For example, the first filter and the second filter are manually used for each imaging without using the rotating chopper. May be switched.

  Furthermore, in the present embodiment, the method using the infrared radiation two-color CT method using two filters of the first filter and the second filter has been described. However, the present invention is not limited to this, and two filters using a plurality of filters are used. The temperature or pressure of the measurement object can be used from the above infrared wavelength range. In addition, when multiple filters are used, a plurality of filters are also sequentially arranged for the rotating chopper, and the rotating chopper is rotated in synchronization with the timing sensed by the infrared sensing means, and infrared rays are sensed while switching the multiple filters. You can also.

  Furthermore, in the present embodiment, the case where the three-dimensional distribution of the temperature or / and pressure of the measurement object is measured is exemplified, but the present invention is not limited to this, for example, the distribution such as the two-dimensional cross-sectional distribution of temperature or / and pressure. Can also be measured by the conventional CT method.

It is a figure which shows schematic structure of the measuring object measuring apparatus which concerns on this embodiment. It is sectional drawing cut | disconnected along the AA 'line of FIG. It is sectional drawing cut | disconnected along the AA 'line of FIG. 1, Comprising: It is a figure at the time of using a conical mirror as a mirror. It is sectional drawing cut | disconnected along the AA 'line of FIG. 1, Comprising: It is a figure at the time of using a parabolic mirror as a mirror. It is sectional drawing cut | disconnected along the AA 'line of FIG. 1, Comprising: It is a figure at the time of using a spherical mirror as a mirror. It is a conceptual diagram of the measuring apparatus by a general CT method. It is the figure which showed the product of the infrared absorption coefficient of the 4.3 micrometer band of carbon dioxide, and the radiation intensity of the black body, using temperature as a parameter. It is the figure which showed ratio R of the radiation energy in two wavelength ranges as a function of temperature. It is a flowchart which shows the processing content of the measuring object measuring apparatus of this embodiment. It is a figure which shows the positional relationship of a measuring object, a plane mirror, and an infrared camera.

Explanation of symbols

10 Airbag,
20 mirrors,
30 Infrared camera,
40 rotating chopper,
50 computers.

Claims (12)

Infrared sensing step of sensing infrared radiation emitted from the measurement object and reflected by a mirror disposed around the measurement object with an infrared sensing means;
Calculating a temperature or / and pressure distribution of the measurement object based on the sensed infrared rays;
The measuring object measuring method characterized by having.   The measuring object measuring method according to claim 1, wherein the infrared detecting means is an infrared camera. The infrared sensing step includes
2. The measuring object measuring method according to claim 1, wherein the infrared light is sensed by the infrared light sensing means through a plurality of filters that respectively pass the plurality of wavelength bands of the infrared light. The infrared sensing means is attached with a rotating chopper in which the plurality of filters are sequentially arranged in the rotation direction,
The infrared sensing step includes
4. The measuring object measuring method according to claim 3, wherein the rotating chopper rotates in synchronization with the timing sensed by the infrared sensing means, and senses the infrared while switching the plurality of filters. The infrared sensing step includes
Sensing the infrared radiation through a first filter that passes the first wavelength range of the infrared radiation;
Sensing the infrared ray through a second filter that passes the infrared second wavelength range; and
The calculating step includes
4. The measurement object measuring method according to claim 3, wherein a pressure or / a pressure distribution of the measurement object is calculated based on infrared rays sensed in the first wavelength band and the second wavelength band. . The infrared sensing means is attached with a rotating chopper in which the first filter and the second filter are sequentially arranged in the rotation direction,
The infrared sensing step includes
6. The measuring object according to claim 5, wherein the rotating chopper rotates in synchronization with a timing sensed by the infrared sensing means, and images the infrared while switching between the first filter and the second filter. Measuring method. The calculating step includes
Calculating an infrared intensity distribution based on the sensed infrared;
A calculation step of calculating a temperature or / and pressure distribution of the measurement object from the infrared intensity distribution;
The measurement object measuring method according to claim 1, comprising: The step of calculating the infrared intensity distribution includes:
8. The measuring object measuring method according to claim 7, wherein the infrared intensity is calculated based on the sensed infrared light and the amount of infrared light absorbed by the measuring object.   The measuring object measuring method according to claim 1, wherein the mirror is a plurality of plane mirrors.   The measuring object measuring method according to claim 1, wherein the mirror is a conical mirror, a parabolic mirror, or a spherical mirror. The calculating step includes
The measurement object measuring method according to claim 9, wherein a finite series expansion is performed to calculate a continuous distribution of temperature or / and pressure of the measurement object. A mirror placed around the object to be measured;
Infrared sensing means for sensing infrared radiation emitted from the measurement object and reflected by the mirror;
Calculating means for calculating a temperature or / and pressure distribution of the measurement object based on the sensed infrared rays;
A measuring object measuring apparatus comprising:

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