JP2017015590A - Temperature distribution measuring method, system, and device, and filament - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a temperature distribution measuring method by which contamination of the measured area can be prevented while ensuring uniformity of fluorescence intensity.SOLUTION: A gas temperature distribution measuring method comprises an irradiation step of irradiating a filament arranged in the measured gas and coated with fluorescent dye with exciting light for exciting the fluorescent dye; a temperature dependence level acquiring step of acquiring at multiple points the temperature dependence level obtained from fluorescence generated by the fluorescent dye and varying with the temperature of the fluorescent dye; and a temperature distribution calculating step of calculating the temperature distribution of the gas from a plurality of the temperature dependence levels on the basis of the relation between the temperature of the fluorescent dye and the temperature dependence level.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a gas temperature distribution measuring method, system, apparatus, and thin wire.

  As a method for measuring the temperature distribution of a gas, there is a method applying the LIF method (Laser Induced Fluorescence).

  For example, in Patent Document 1, a fluorescent dye solution is sprayed onto a gas to be temperature-measured to form a droplet group, which is irradiated with light containing a component in a wavelength region that excites the fluorescent dye, and the fluorescence intensity of the fluorescent dye is determined. The temperature of the gas is measured by measuring and calculating the temperature from the fluorescence intensity.

JP 2013-68499 A

  However, in the method described in Patent Document 1, since a droplet containing a fluorescent dye is sprayed into a gas, the droplet falls, resulting in non-uniformity of fluorescence intensity that can be an error factor. Furthermore, the measurement area is soiled by the sprayed droplets.

  The present invention has been made in view of such circumstances, and provides a temperature distribution measuring method capable of preventing contamination of a measurement region while ensuring uniformity of fluorescence intensity.

  According to the present invention, there is provided a method for measuring a temperature distribution of a gas, the irradiation step of irradiating excitation light for exciting the fluorescent dye on a fine line disposed in the gas to be measured and coated with the fluorescent dye; A temperature-dependent value distribution obtaining step for obtaining temperature-dependent values obtained from the fluorescence generated by the fluorescent dye and changing depending on the temperature of the fluorescent dye at a plurality of points, and a relationship between the temperature and the temperature-dependent value of the fluorescent dye And a temperature distribution calculating step of calculating a temperature distribution of the gas from a plurality of the temperature-dependent values.

  In the temperature distribution measuring method of the present invention, since the fluorescent dye is applied to the thin line, it is possible to reduce the occurrence of non-uniformity of the fluorescence intensity due to the fall of the fluorescent dye. Furthermore, the measurement area is not soiled.

Hereinafter, various embodiments of the present invention will be exemplified. The following embodiments can be combined with each other.
Preferably, the diameter of the thin wire is 5 μm to 60 μm.
Preferably, the temperature dependent value is a ratio of fluorescence intensities of different wavelength components.
Preferably, the thin wire is disposed in a gas having a flow.
Preferably, the thin line is a plurality of thin lines arranged at a predetermined interval, and has a complementing step of complementing the temperature of the gas in the space between the adjacent thin lines based on the temperature of the adjacent thin lines.
Preferably, a plurality of thin wire groups in which a plurality of the thin wires are arranged on the same plane are arranged at positions that do not overlap each other when viewed from the excitation light source in the irradiation step.
Preferably, the interval between the plurality of thin lines is adjusted such that the interval in the region where the gas flow of the measurement target is fast is narrower than the interval in the region where the gas flow of the measurement target is slow.
Preferably, irradiation means for irradiating excitation light that excites the fluorescent dye to a fine wire disposed in the gas to be measured and coated with the fluorescent dye, and obtained from the fluorescence generated by the fluorescent dye and the fluorescent light Temperature-dependent value acquisition means for acquiring temperature-dependent values that change depending on the temperature of the dye at a plurality of points, and based on the relationship between the temperature and the temperature-dependent value of the fluorescent dye, And a temperature distribution calculating unit for calculating a temperature distribution.
Preferably, it is a fine wire having a diameter of 5 μm to 60 μm to which a fluorescent dye is applied.
Preferably, it is a gas temperature distribution measuring device having a fine wire having a diameter of 5 μm to 60 μm coated with a fluorescent dye and a frame for fixing the fine wire.

It is a conceptual diagram of the apparatus utilized for the temperature distribution measuring method which concerns on 1st Embodiment, (a) is a front view and the outline | summary of a system, (b) is the figure which represented typically the measurement point in a thin wire | line. . It is a conceptual diagram showing the diameter of a thin wire | line and the behavior of the surrounding air current, (a) is a conceptual diagram in case a diameter is small enough, (b) is a conceptual diagram in case a diameter is large. It is an example of the relationship between the intensity ratio and temperature of different wavelength components of the fluorescent dye. It is a conceptual diagram of the apparatus utilized for the temperature distribution measuring method which concerns on 2nd Embodiment, (a) is the aspect which arrange | positioned the thin wire | line at equal intervals, (b) is a thin wire | line according to the speed of the flow of the gas to be measured. It is a figure showing the aspect which adjusted and arrange | positioned the space | interval. It is a conceptual diagram of the apparatus utilized for the temperature distribution measuring method which concerns on 3rd Embodiment, (a) is vertical and horizontal arrangement | positioning, (b) is a figure which shows diagonal arrangement | positioning. It is a conceptual diagram of the temperature distribution measuring method which concerns on 4th Embodiment. It is the conceptual diagram which looked at FIG. 6 from the AA 'direction. It is a conceptual diagram of inclination correction when a thin line is imaged from an oblique direction. It is a temperature distribution diagram showing an actual measurement result.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Various characteristic items shown in the following embodiments can be combined with each other. In addition, the invention is independently established for each feature.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. The first embodiment is characterized in that the thin wire 5 is arranged in the gas to be measured, and the temperature of the surrounding gas is obtained by calculating the temperature of the thin wire 5. The fine wire 5 arranged in the gas to be measured is given thermal energy from the surrounding gas with the passage of time, and becomes a temperature similar to the temperature of the gas. Therefore, by calculating the temperature of the fine wire 5 The temperature of the gas is measured. Specifically, in order to calculate the temperature of the fine wire 5, a fluorescent dye is applied to the fine wire 5, and the calculated temperature of the fluorescent dye is set as the temperature of the fine wire 5. Thereby, for example, it is possible to measure the distribution of the indoor temperature by the air conditioner, the distribution of the temperature around the engine of the car or motorcycle, and the like.

  FIG. 1 is a conceptual diagram of an apparatus used in the temperature distribution measuring method according to the first embodiment. FIG. 1 (a) shows a front view and an outline of the system, and FIG. 1 (b) shows a measurement point in a thin line 5. It is the figure represented typically. As shown in FIG. 1 (a), the temperature distribution measuring apparatus 100 has a thin wire 5 coated with a fluorescent dye fixed to a frame 1 in which a plurality of scales 3 are engraved.

  As a thin wire of this embodiment, metal wires, such as a copper wire, a gold wire, and a platinum wire, nylon thread, carbon fiber, piano wire, cotton thread, spider thread, etc. can be used, for example. In this embodiment, nylon yarn is used.

  The space | interval of the scale 3 is adjusted suitably, for example, 0.5 mm-10 cm are preferable. More preferably, it is 0.7 mm-5 cm. More preferably, it is 1 mm-1 cm. Thereby, the user can easily adjust the interval between the thin lines 5.

  The thin wire 5 is preferably as small as possible in diameter. This is because if the diameter of the thin wire 5 is large, the viscous force between the gas and the gas decreases, and the Reynolds number expressed by the inertial force / viscous force of the gas increases. As a result, a turbulent flow called Karman vortex is generated, which becomes an error factor in temperature measurement. FIG. 2 is a conceptual diagram showing this, FIG. 2A shows a case where the diameter D of the thin wire 5 is sufficiently small, and FIG. 2B shows a case where D is large. Therefore, the diameter of the thin wire 5 is preferably 5 to 60 μm so that the Reynolds number is set to one digit or less in order to suppress the occurrence of turbulent flow. More preferably, it is 6-20 micrometers. More preferably, it is 7-15 micrometers. Specifically, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 30, 40 , 50, 55, and 60 μm, and may be within a range between any two of the numerical values exemplified here. In the first embodiment, the thin wire 5 having a diameter of about 10 μm is used. Here, the diameter of the fine line means an average value of the diameters measured at a plurality of locations of the fine line.

This numerical range was calculated from the following calculation. Reynolds number is “Re = ρvL / μ” (v: average velocity relative to the flow of the object (m / s), L: characteristic length (m) (here, diameter of the thin wire 5), μ: viscosity of the fluid Coefficient (kg / m · s), ρ: Density of fluid (kg / m ³ )). Therefore, for example, when the temperature of the measurement target gas is 10 ° C., the density is 1.25 (kg / m ³ ), the viscosity is 17.4 × 10 ⁻⁶ (kg / m · s), and the gas velocity is 1 ( m / s), the condition for the Reynolds number to be 1 or less is “Re (Reynolds number) = 1.25 × 1 × D / 1.75 × 10 ⁻⁶ <1 and D <13. 9.9 × 10 ⁻⁶ m (= 13.9 μm) When the temperature of the measurement target gas is 80 ° C., the density is 0.99 (kg / m ³ ) and the viscosity is 21.5 × 10 ^−6. (Kg / m · s) and the gas velocity is 4 (m / s), the condition for the Reynolds number to be 1 or less is “Re (Reynolds number) = 0.99 × 4 × From D / 21.5 × 10 ⁻⁶ <1, D <54.3 × 10 ⁻⁶ m (= 54.3 μm), and the gas velocity is further increased. In order to stably reduce the Reynolds number to one digit or less even when the speed is high or low, in the present embodiment, the margin is set to 5 to 60 μm. In this case, when the temperature of the measurement target gas is 20 ° C., the kinematic viscosity coefficient is 0.0001512 (m ² / s), and the gas velocity is 5 (m / s), “Re = vL / ν” (v: The average velocity (m / s) relative to the flow of the object, L: the characteristic length (m), the kinematic viscosity coefficient (ν = μ / ρ) (m ² / s), and the diameter D of the thin wire 5 is In the case of 50 μm, Re = 1.653439153. Here, even when Mach 1 (= 330 (m / s)) is assumed as the maximum flow velocity considered in a normal environment, the diameter D of the thin wire 5 is 5 μm. In this case, Re = 10.9127 and the Reynolds number is one digit. Since it is a little over the value, it is not necessary to further reduce the diameter of the fine wire 5. Here, when the diameter of the fine wire 5 is changed, it changes depending on the temperature of the fluorescent dye in the temperature distribution calculating step described later. Therefore, it is possible to cope with the case where the velocity of the gas to be measured is high or low by using the thin wire 5 as much as possible. Is preferably 5 to 60 μm, more preferably 6 to 20 μm, and even more preferably 7 to 15 μm.

  As the fluorescent dye, substances whose fluorescence spectrum is temperature-dependent, such as rhodamine B and rhodamine 110, can be used. Further, as the fluorescent dye, one kind of substance may be used, or two or more kinds of substances may be used. For example, a fluorescent dye obtained by adding rhodamine 110 to rhodamine B may be used.

  Hereinafter, a gas temperature distribution measuring method using the temperature distribution measuring apparatus 100 will be described.

<Irradiation step>
In the irradiation step, the temperature distribution measuring device 100 is arranged in the gas to be measured, and the thin line 5 is irradiated with light (excitation light) including a component in a wavelength region that excites the fluorescent dye.

  An ultraviolet lamp (wavelength: 315 to 400 μm, 20 W) was used as a light source for excitation light. In addition to this, an arbitrary light source (for example, an argon laser) that emits light including a component in a wavelength range for exciting the fluorescent dye can be used.

<Temperature dependent value distribution acquisition step>
In the temperature-dependent value distribution acquisition step, temperature-dependent values that are obtained from the fluorescence generated by the fluorescent dye and change depending on the temperature of the fluorescent dye are acquired at a plurality of points. As a result, a temperature-dependent value distribution (one-dimensional distribution, two-dimensional distribution, or three-dimensional distribution) is obtained. Specifically, the fluorescent dye applied to the thin wire 5 is excited by the excitation light, and fluorescence is emitted from the fluorescent dye. The fluorescence is imaged by the camera 20 which is an imaging device, and an image necessary for the LIF method described later is acquired. Depending on the temperature of the fluorescent dye from the acquired image, the fluorescence spectrum emitted from the fluorescent dye has a temperature dependency (for example, the proportion of the short wavelength component increases with increasing temperature). Change temperature dependent values are obtained at multiple points.

  The imaging device (camera 20) is, for example, a CCD camera (hereinafter referred to as camera 20) having an RGB filter function. For example, an ISO sensitivity of about 6,400 to 204,800 can be used. In the first embodiment, the camera 20 having an ISO sensitivity of 25,600 is used. Here, the R filter is a filter that selectively transmits light of, for example, 575 to 640 μm, the G filter is, for example, 490 to 575 μm, and the B filter is, for example, 400 to 485 μm. The shutter speed was 1/10 seconds. As a matter of course, these numerical values are merely examples, and are appropriately set according to the diameter of the thin wire 5, the distance between the camera 20 and the thin wire 5, and the like.

  The distance between the camera 20 and the thin wire 5 is appropriately adjusted according to the diameter and interval of the thin wire 5, the resolution of the camera 20, and the like, and preferably 10 cm to 10 m, for example. More preferably, it is 1-5 m. More preferably, it is 1.5-4m.

  As temperature-dependent values, fluorescence intensity of all wavelength components, fluorescence intensity of specific wavelength components, ratio of fluorescence intensity of different wavelength components, etc. can be used, but the absolute value of fluorescence intensity depends on the amount of fluorescent dye applied. Therefore, it is difficult to distinguish whether the difference in fluorescence intensity is caused by the difference in temperature or the difference in coating amount of the fluorescent dye. On the other hand, the ratio of the fluorescence intensities of the different wavelength components does not depend on the amount of the fluorescent dye applied, so the difference in the ratio of the fluorescence intensities can be attributed to the difference in the temperature of the fluorescent dye. Therefore, it is preferable to use a ratio of fluorescence intensities of different wavelength components as the temperature dependent value. For example, the ratio of the fluorescence intensity of the R component to the fluorescence intensity of the G component (R / G) can be used as the ratio of the fluorescence intensity.

  As described above, as the fluorescent dye, one kind of substance may be used, or two or more kinds of substances may be used. By mixing two types of fluorescent dyes having different temperature dependences of the fluorescence spectrum, the temperature dependence of the temperature dependence value may be increased, and the captured image may be easily decomposed into an R component and a G component. . Alternatively, a fluorescent dye that changes the fluorescence intensity of the B component with a change in temperature may be applied to the thin wire 5, and the temperature change of the fluorescence intensity of the B component may be used. Furthermore, instead of the R / G intensity ratio, the temperature change of the intensity of the R component and the intensity of the G component may be used.

<Temperature distribution calculation step>
In the temperature distribution calculation step, based on the relationship between the temperature of the fluorescent dye and the temperature-dependent value, the temperature distribution of the gas to be measured is calculated from the temperature-dependent values at the plurality of points obtained in the above step.

  Examples of the relationship between the temperature of the fluorescent dye and the temperature-dependent value include a diagram, a graph, or a relational expression that represents the relationship between the temperature of the fluorescent dye and the temperature-dependent value. This relationship may be obtained in advance before obtaining the temperature-dependent value, or may be obtained after obtaining the temperature-dependent value.

<Temperature dependent value and temperature distribution measurement system>
The calculation of the temperature dependent value is executed by the temperature dependent value calculating device 30, and the data representing the relationship between the temperature of the fluorescent dye and the temperature dependent value obtained in advance is stored in the storage device 40, and the temperature distribution of the fluorescent dye to be measured is calculated. The calculation is executed by the temperature distribution calculation device 50. Here, these devices and the camera 20 can communicate with each other via the network 60. The camera 20 only needs to be able to communicate with at least the temperature-dependent value calculation device 30, and the communication method may be either wired or wireless. Here, the temperature dependent value calculation device 30, the storage device 40, and the temperature distribution calculation device 50 are a PC, a server, and the like, and each device may be separated or may be configured as a single device. As described above, the processing by the temperature dependent value calculating device 30 corresponds to acquiring temperature dependent values that change depending on the temperature at a plurality of points, and the temperature dependent value calculating device 30 and the temperature distribution calculating device 50 cooperate. Thus, a temperature distribution measurement system is configured.

<About the LIF method>
Here, the LIF method for temperature measurement used in the first embodiment will be briefly described. In this method, fluorescence emitted from a substance whose fluorescence spectrum is temperature-dependent is imaged, and the temperature is calculated therefrom. For example, in the rhodamine B used in the first embodiment, the ratio of the short wavelength component increases as the temperature increases, and the ratio of the long wavelength component increases as the temperature decreases. Using this property, the temperature of the measurement target gas is measured based on the intensity ratio R / G, which is the ratio of the intensity of the R component and the intensity of the G component at a certain temperature. The method is as follows. For general explanation, the case of measuring the temperature of the liquid is illustrated.

<Preparation>
1. The temperature of the liquid in which rhodamine B is dissolved is measured with an existing thermometer (such as one using a sensor).
2. The rhodamine B at the measured temperature is irradiated with light (laser or the like) having a component in the excitation wavelength region of rhodamine B, the resulting fluorescence is imaged, and the R component and the G component are separated from the image, and the R component And the intensity ratio R / G of the G component is calculated.
3. The temperature is changed, R / G values at a plurality of temperatures are calculated, and the horizontal axis is plotted as the temperature, and the vertical axis is plotted as the R / G value. This is shown in FIG.

<Temperature measurement of measurement target>
1. Rhodamine B is dissolved in the liquid to be measured, and light (laser or the like) having a component in the excitation wavelength region of rhodamine B is irradiated.
2. The generated fluorescence is imaged and separated into an R component and a G component to calculate an intensity ratio R / G.
3. The temperature of rhodamine B dissolved in the liquid to be measured is calculated using the relationship between the calculated R / G value and the temperature-dependent value of the fluorescent dye as shown in FIG. . Thereby, the temperature of the liquid to be measured can be measured.
Note that it is not always necessary to prepare in advance before “2. Image the generated fluorescence and separate the R component and G component to calculate the intensity ratio R / G”, and calculate R / G from the captured image. After that, the relationship between R / G and temperature may be acquired.

  Since the first embodiment is intended to measure the temperature of the gas, the temperature distribution measuring device 100 is placed in the gas to be measured, and the fluorescence generated by being excited by ultraviolet rays is imaged. R / G at the position is obtained. FIG. 1B conceptually shows 12 points, but R / G is obtained for each of these points. Then, assuming that R / G is 0.49, 0.491, 0.492..., 0.501 in order from the left, the temperature is about 50 ° C. from the left to the right from the result of FIG. It can be seen that the temperature changes gently at about 44 ° C. In this way, the temperature and temperature distribution of the gas to be measured can be calculated.

  In the first embodiment, since the thin wire 5 having a diameter of about 10 μm is used, generation of turbulence around the thin wire 5 is suppressed even if it is placed in the gas to be measured, and the movement of the gas around the thin wire 5 is prevented. Since the degree is small, a desired measurement result can be obtained. Further, unlike the method disclosed in Patent Document 1, the position of the fluorescent molecule is fixed on the thin line 5 (excluding the vibration of the molecule, etc.), so that non-uniformity of the fluorescence intensity that may cause an error occurs. Since it is easy to use the relationship between the temperature of the fluorescent dye and the temperature-dependent value, the temperature can be calculated with higher accuracy. Further, since it is fluorescent, it is not affected by irregular reflection compared to reflected light. Furthermore, the measurement area is not soiled.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIG. In the temperature distribution measuring apparatus 100 of the second embodiment, as shown in FIG. 4 (a), a plurality of fine wires 5 coated with a fluorescent dye are provided in parallel at a constant interval with a distance d. And R / G is calculated about each of the some thin wire | line 5 similarly to 1st Embodiment. And the temperature and temperature distribution in the plane (two dimensions) of the gas to be measured can be measured by linearly interpolating the temperature between the adjacent thin wires 5.

  Further, as shown in FIG. 4B, the interval between the thin wires 5 may be narrowed in a region where the gas flow is fast, and the interval between the thin wires 5 may be widened in a region where the gas flow is slow. This is to increase the accuracy of linear interpolation because the temperature distribution is considered to vary greatly in the region where the gas flow is fast. Conversely, since it is considered that the change in temperature distribution is small in a region where the gas flow is slow, linear interpolation is possible even if the interval is wide.

  In FIG. 4B, when the upper side of the figure is a region where the gas flow is faster than the lower side, for example, the upper side is near the air outlet of the air conditioner, the distance between the thin wires 5 is d1 (= d / 4) on the upper side. Subsequently, d2 (= d / 2) is set, and d is arranged on the lower side. The linear interpolation is executed by an information processing apparatus connected to the system shown in FIG. 1A or a PC or server (not shown).

(Third embodiment)
Next, a third embodiment will be described with reference to FIG. In the temperature distribution measuring apparatus 100 of the third embodiment, the thin line 5 is arranged vertically and horizontally with respect to the frame 1 as shown in FIG. Thus, by measuring the temperature and temperature distribution of the fine wires 5 in the vertical direction, the accuracy of interpolation between the fine wires 5 in the horizontal direction can be increased. For example, when the r-axis is taken in the vertical direction, it is assumed that the temperature distribution of the leftmost thin line 5 (W1) is approximated by a function f (r). Considering this, the temperature between the thin wires 5 in the horizontal direction intersecting the thin wires 5 (W1) is interpolated. Specifically, assuming that the coordinate of r at point O is 0 and the temperature of the thin line 5 is T1, the point O to point between the uppermost line and the second thin line 5 (W2) and the thin line 5 (W3) from the top. The temperature of the gas in the space between P is calculated by “T1 + f (r)”. Then, the function f (r) is obtained for all the vertical thin lines 5 and is used to interpolate the temperature distribution between the horizontal thin lines 5 so that the temperature and temperature distribution in the plane (two dimensions) can be more accurately determined. It becomes possible to measure. Further, as shown in FIG. 5B, a plurality of thin lines 5 may be arranged in an oblique direction with respect to the frame 1. Even in this case, the temperature and the temperature distribution in the plane (two dimensions) can be measured by interpolating the temperature between the thin wires 5. Note that the calculation of f (r) and linear interpolation using this are executed by an information processing apparatus connected to the system shown in FIG. 1A or a PC or server (not shown).

(Fourth embodiment)
Next, a fourth embodiment will be described with reference to FIG. In the fourth embodiment, the thin wire 5 is directly arranged inside the measurement target region 10 without using the temperature distribution measuring device 100. For example, the thin wire 5 is attached to the wall or the like of the measurement target region 10 with a tape or the like. In the fourth embodiment, as in the second embodiment, a plurality of fine wire groups in which a plurality of fine wires 5 are arranged on the XZ plane are provided in the Y-axis direction. That is, it is set as the structure which arrange | positions the several thin wire | line 5 in a plane (2 dimensions), and arranges it spatially (3 dimensions). For the sake of explanation, the plane (two-dimensional) is shown as the first, second, and third columns in order from the front (negative side of the Y axis).

  The thin wire 5 is irradiated with ultraviolet rays from the front by an ultraviolet lamp (not shown), and the fluorescence emitted from the fluorescent dye is imaged from the front of the thin wire 5 using the camera 20A. Then, R / G of the thin lines 5 in the first, second, and third columns is calculated, and the temperature and temperature distribution of the thin lines 5 in the first to third columns are measured. And the temperature and temperature distribution in the plane (2 dimensions) of the 1st row-the 3rd row can be measured by carrying out linear complement to the Z-axis direction. The temperature and temperature distribution of the gas in the space between the first column, the second column, the second column, and the third column can be obtained by linear interpolation in the Y-axis direction. Thus, in the fourth embodiment, the temperature and temperature distribution in the three-dimensional space can be measured.

  Here, when imaging with the front camera 20A, if the Z-direction coordinates of the thin lines 5 in the first, second, and third columns are the same, the thin lines 5 in the back row cannot be imaged. Therefore, in the fourth embodiment, the positions in the Z direction of the thin lines 5 in the first, second, and third rows are shifted. FIG. 7 shows a conceptual diagram of a state in which the measurement target region 10 is viewed from the AA ′ direction in FIG. With the arrangement as shown in FIG. 7, the fluorescence emitted from the fluorescent dye in the rear row can be imaged by the front camera 20A.

  Furthermore, in addition to the front camera 20A, a camera 20B that captures images from other directions can also be used. For example, when the distance between the thin lines 5 in the Z direction and the Y direction is small, it may be difficult to capture the thin lines 5 in the back row with only the front camera 20A even if the Z coordinates of the thin lines 5 in each row are shifted. is there. At this time, in addition to the front camera 20A, a camera 20B arranged in an oblique direction is also used. The thin lines 5 in the second and third rows are imaged by the camera 20B, and the temperature and temperature distribution of the thin lines 5 in the second and third rows are measured using the images.

  Here, since the camera 20B captures an image from an oblique direction rather than the front of the thin line 5, the thin line 5 is inclined in the obtained image. In order to correct this, for example, processing as shown in FIG. 8 is performed. As shown in FIG. 8, the thin line 5a actually captured by the camera 20B is inclined. Here, when the thin line 5 is imaged by the front camera 20A, it is assumed that the image is captured as the thin line 5b. When the length of the thin line 5b at this time is L, the length of the actually captured thin line 5a is l, and the angle between the thin line 5a and the thin line 5b is θ, the actually captured thin line 5a is rotated clockwise. It is possible to obtain an image equivalent to that taken from the front by rotating the angle to θ and multiplying the distance by L / l. This is a simple explanation of tilt correction in image processing technology, and various algorithms can be used.

  As described above, in the fourth embodiment, a plurality of thin lines 5 are arranged spatially (three-dimensionally) in the measurement target region 10, and the planes (two-dimensional) of the first column to the third column are processed in the same manner as in the second embodiment. ) And the temperature distribution in the measurement target region 10 can be measured by interpolating between the columns. Here, also in the fourth embodiment, the diameter of the thin wire 5 is set to, for example, 10 μm so that the Reynolds number is one digit or less, so that the occurrence of turbulence in the wake of the thin wire 5 with respect to the air flow is suppressed. In addition, since the degree of obstructing the movement of the gas around the thin wire 5 is small, it is possible to accurately measure the actual temperature of the thin wire 5 in each row by minimizing the measurement error. Further, since the droplets are not sprayed, the measurement target region 10 is not soiled. In addition, since the camera 20 used for imaging needs to be a commercially available one, for example, about 2 to 50,000 yen, the cost required to prepare equipment necessary for temperature measurement can be kept extremely low.

  Calculation of f (r) and linear interpolation and inclination correction using the calculation are executed by an information processing apparatus connected to the system shown in FIG.

(Actual measurement results)
Next, actual measurement results will be described. The measurement conditions are as follows. The X axis, the Y axis, and the Z axis are assumed to be in the directions shown in FIG.
<Measurement conditions>
1. Fluorescent dye: Rhodamine B
2. Fine wire 5: Three wires arranged in parallel in the X-axis direction at positions of 50 μm in diameter and Z = 0, 5, 10 mm Irradiation light: UV lamp with a wavelength of 315 to 400 μm and an output of 20 W Camera 20: Digital SLR camera (ISO 25600)
5. Heat source: Nichrome heater (diameter 5 mm, heat output 30 W) installed at the midpoint of the thin wire 5 in the X-axis direction (X = 0) and Z = -30 mm
Here, the heat source was used to increase the temperature distribution and make it easy to see the experimental results.

  First, the measurement target area 10 was heated for a predetermined time with a nichrome heater, and the measurement target area 10 was imaged with the camera 20. From the obtained image, R / G was calculated for each of the three thin wires 5 arranged at the positions of Z = 0, 5, and 10 mm. And the temperature of gas and temperature distribution in the space of the range of Z = 0-10 mm were complemented by the linear complement mentioned above. This measured the temperature and temperature distribution in a plane (two dimensions). FIG. 9 is a diagram showing a temperature distribution in an actual measurement result. As shown in FIG. 9, the temperature at X = 0 (directly above the heat source) is about 88 ° C. to 75 ° C., and at X = −3 to 3 mm, Z = 0 except for just above the heat source. It is about 45-65 degreeC over 10 mm. And when X = -5-5mm and 3-5mm, it turned out that it is about 10-30 degreeC over Z = 0-10mm.

  In this way, by arranging the thin wire 5 coated with the fluorescent dye in the measurement target region 10, the occurrence of non-uniformity of the fluorescence intensity that can be an error factor is suppressed, and the temperature and temperature are not contaminated. The distribution could be measured. In addition, since the diameter of the thin wire 5 is reduced, generation of turbulence in the wake of the thin wire 5 can be suppressed, and the degree of hindering the movement of gas around the thin wire 5 is small, so that a more accurate temperature can be measured. I think it was.

  As described above, the temperature distribution measuring methods described in the various embodiments can provide all necessary devices at a low cost, and can easily measure the temperature and temperature distribution of the measurement target region 10 even without a skilled engineer. It can be done.

  Further, the arrangement of the thin wires 5 is appropriately adjusted. For example, a plurality of fine wires 5 may be provided in the longitudinal (Z-axis) direction instead of the arrangement shown in FIG. In this case, the thin wire 5 may be attached to the ceiling and floor of the room that is the measurement target region 10 with a tape. In addition to the arrangement shown in FIG. 6, the plurality of fine wires 5 may be provided in the front-rear (Y-axis) direction or in an oblique direction. In these cases, when the temperature between the thin wires 5 is complemented, the same complement as in the third embodiment can be performed using the thin wires 5 provided in the Z-axis, Y-axis, and oblique directions. Furthermore, a string may be tied to the temperature distribution measuring device 100 in the first to third embodiments and hung from the measurement target region 10.

  Further, the camera 20 that captures only the R component and the camera 20 that captures only the G component may be used in combination. Furthermore, when the imaging range is insufficient with one camera 20, a plurality of cameras 20 may be used in combination to expand the imaging range.

  Further, data representing the distribution of R / G obtained by irradiating the thin line with excitation light and performing a process up to the process of obtaining the R / G distribution from the fluorescence emitted from the fluorescent dye. May be transmitted to a laboratory located at a remote location, and the temperature distribution may be calculated in the laboratory.

1: frame, 3: scale, 5: fine line, 5a: fine line actually picked up, 5b: thin line when picked up from the front, 10: measurement target region, 20: camera, 30: temperature dependent value calculation device, 40 : Storage device, 50: temperature distribution calculation device, 60: network, 100: temperature distribution measurement device

Claims (10)

A gas temperature distribution measuring method,
An irradiation step of irradiating excitation light that excites the fluorescent dye on a fine wire disposed in a gas to be measured and coated with the fluorescent dye;
A temperature-dependent value distribution obtaining step for obtaining temperature-dependent values obtained from the fluorescence generated by the fluorescent dye and changing depending on the temperature of the fluorescent dye at a plurality of points;
Based on the relationship between the temperature of the fluorescent dye and the temperature dependent value, a temperature distribution calculating step for calculating a temperature distribution of the gas from a plurality of the temperature dependent values;
Method for measuring temperature distribution of gas having The diameter of the thin wire is 5 μm to 60 μm,
The temperature distribution measuring method according to claim 1.   The temperature distribution measuring method according to claim 1 or 2, wherein the temperature dependent value is a ratio of fluorescence intensities of different wavelength components.   The temperature distribution measuring method according to any one of claims 1 to 3, wherein the thin line is arranged in a gas having a flow. The fine lines are a plurality of fine lines arranged at a predetermined interval,
The temperature distribution measuring method according to any one of claims 1 to 4, further comprising a complementing step of complementing a gas temperature in a space between the adjacent thin lines based on a temperature of the adjacent thin lines. A plurality of fine wire groups in which a plurality of fine wires are arranged on the same plane are arranged at positions that do not overlap each other when viewed from the light source of the excitation light in the irradiation step.
The temperature distribution measuring method according to claim 5. The interval between the plurality of fine lines is adjusted so that the interval in the region where the gas flow of the measurement target is fast is narrower than the interval in the region where the gas flow of the measurement target is slow,
The temperature distribution measuring method according to claim 5 or 6. Irradiation means for irradiating excitation light that excites the fluorescent dye with respect to a fine wire disposed in the gas to be measured and coated with the fluorescent dye;
Temperature-dependent value acquisition means for acquiring temperature-dependent values obtained from the fluorescence generated by the fluorescent dye and changing depending on the temperature of the fluorescent dye at a plurality of points;
Based on the relationship between the temperature and the temperature dependent value of the fluorescent dye, a temperature distribution calculating means for calculating a temperature distribution of the gas from a plurality of the temperature dependent values;
A gas temperature distribution measuring system having   A fine wire having a diameter of 5 μm to 60 μm to which a fluorescent dye is applied. A thin wire according to claim 9;
A frame for fixing the thin wire;
An apparatus for measuring a temperature distribution of a gas.