JPH0784B2 - Heat pattern measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention provides various heat distributions generated in an object constituted by a surface layer portion and a deep portion located inside the surface layer portion and through which liquid flows. The present invention relates to a heat pattern calculation device for calculation.

For example, the surface layer corresponds to the skin of an animal body, and the liquid corresponds to blood, but is not limited to these.

[Conventional technology]

Referring to FIG. 1, in general, in an object that is composed of a surface layer portion 1 and a deep portion 2 that is located inside the surface layer portion 1 and through which liquid flows, the amount of heat carried by the liquid flowing from the deep portion 2 into the surface layer portion 1. Q _b , heat quantity Q _c due to conduction from the deep part 2 to the surface part 1, and internally generated heat Q _m generated inside the surface part 1.
The sum Q _b + Q _c + Q _m of the heat loss Q _r lost by radiation from the surface layer 1 to the outside, the heat loss Q _e lost by evaporation of the liquid in the surface layer 1 and the convection from the surface layer 1 to the outside. It is equal to the sum _Qr + Q _e + Q _f of the generated heat Q _f . That is, the sum Q _b + Q _c +
There is a relation of Q _m = Q _r + Q _e + Q _f . Where Q _b = αρcV _s (T _b -T _s ) t _s Q _r = K _r (T _s ⁴ -T _w ⁴ ). Q _f = K _f D ^-0.25 (T _s -T _a ) ^1.25 Where α is the counter current rate of the liquid ρ is the density of the liquid c is the heat capacity of the liquid V _s is the flow rate of the liquid T _b is the temperature of the liquid T _s is the surface temperature of the surface layer 1 _ts is the thickness of the surface layer 1 _r is a constant T _w is the background of the object For example, the temperature of the wall K _c is the conductivity coefficient between the depth 2 and the surface layer 1 T _c is the temperature of the depth 2 K _f is the constant D is the diameter of the object _Ta is the surface layer 1 The ambient temperature _Mo of the constant _Tm is the average temperature in the surface layer 1 (see Iwatani et al.,
"Skin blood flow measurement method using thermography and its clinical application knowledge" The 13th Japanese Medical Biology Thermography Study Group
(Abstracts of the papers of the Annual Meeting, published June 20, 1981).

The above-mentioned counter current rate is a countercurrent distribution in heat exchange, and the blood flow between the hot artery (sending side) and the cold vein (returning) blood vessel should be estimated at the periphery of the target. It represents the rate of heat exchange of temperature before blood flow reaches it. This value is almost anatomically and thermophysiologically determined by each part of the body. For example, when estimating peripheral blood flow in the extremities, a warm environment (25
The temperature is 0.8 in the case of (° C to 31 ° C), is about 0.2 in a low temperature environment (15 ° C or less), and is 0.1 or less in the blood flow estimation of the duck's watering.

It has already been proposed by the same inventors to obtain a flow rate distribution of a liquid from the distribution of the surface temperature T _s of the surface layer portion 1 and the ambient temperature T _a measured by the infrared imaging device and display the pattern using the above relationship. Has been done.

[Problems to be Solved by the Invention]

However, in the above-mentioned proposal, a plurality of arithmetic means are required to arithmetically process the above-mentioned values Q _b , Q _r , Q _c , Q _f , and Q _m .

[Means for Solving the Problems]

According to the present invention, in the apparatus for measuring the heat pattern of the surface layer portion and the deep portion which is located inside the surface layer portion and in which the liquid flows, the distribution of the surface temperature T _s of the surface layer portion and the an infrared video storage means for measuring and storing the distribution of the ambient temperature T _a of the surface layer portion, the heat distribution by the liquid _{Q b = αρcV s (T b} -T s) t s, however, alpha, [rho, c , V _s , T _b , t _s respectively represent the counter current rate of the liquid, the density of the liquid, the heat capacity of the liquid, the flow rate of the liquid, the temperature of the liquid, the thickness of the surface layer portion, Radiant heat distribution Q _r = K _r (T _s ⁴ -T _w ⁴ ), where K _r is a constant and T _w is the background temperature of the object. However, α, K _c , and T _c are the counter current rate of the liquid, the conduction coefficient between the deep portion and the surface portion, respectively.
Convective heat distribution Q _f = K _f · D ^-0.25 (T _s -T _a ) ^1.25 indicating the temperature of the deep portion, where K _f is a constant and D is equivalent to the diameter of the body. Generated heat distribution However, M _o is a constant, T _m is equivalent to the average temperature in the surface layer of the object, t _s is the thickness of the surface layer, the calculation means for calculating, and the heat distribution obtained by the calculation means. A heat pattern measuring device is provided, which comprises:

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 is a block diagram showing an embodiment of the thermal pattern calculation device according to the present invention. In FIG. 3, reference numeral 10 denotes a storage and arithmetic unit, which is constituted by a microcomputer, for example. Reference numeral 11 is an infrared imaging device, 12 is a keyboard, 13 is a CRT terminal device, and 14 is a CRT.

In the microcomputer 10, the deep temperature T _c , the background temperature T _w, etc. are supplied from an unillustrated thermometer to the A / D converter 101 with a built-in analog multiplexer. Infrared imaging device 11
Each digital signal indicating the surface temperature T _s and the ambient temperature T _a obtained by the above is supplied to a predetermined position of the input interface 102, and the digital signal from the keyboard 12 is also supplied to a predetermined position of the input interface 102.
The keyboard 12 is used to input various command start instructions and constant parameters that are not connected to the A / D converter 101, such as α, ρ, c, ...

A / D converter 101 and input interface common bus 103
It is connected to the CPU 104, RAM 105, ROM 106, and output interface 107 via.

The RAM 105 stores constant parameters from the A / D converter 101 and the keyboard 12 and calculation results of various heat patterns.

The RAM 106 stores programs such as an initial routine and various heat pattern calculation routines, fixed data necessary for these, and the like.

A CRT terminal device 13 for controlling display of the CRT 14 is connected to a predetermined position of the output interface 107.

The operation of the microcomputer shown in FIG. 3 will be described.

First, in the initial routine, the deep temperature T _c and the background temperature T _w are fetched from the A / D converter 101 and stored in a predetermined area of the RAM 105, and other necessary constant parameters are stored in the RAM 105 using the keyboard 12. Stored in a predetermined area.

The infrared imaging device 11 scans the surface layer 1 of the object and its surroundings, A / D-converts the infrared intensity emitted from each part, and outputs it. That is, the infrared imaging device 11 outputs each digital signal indicating the surface temperature T _s and the ambient temperature T _a of the surface layer portion 1 to the input interface 102 together with the scanning address. As a result, the CPU 104 sets the surface temperature T _s and the ambient temperature T _a to the RAM1.
Store in the area corresponding to the 05 scan address. Therefore,
The pattern of the surface temperature T _{s and} the pattern of the ambient temperature T _a are formed in the RAM 105. The ambient temperature T _a is within a measurement (imaging) range, for example, on a thin black paper or a thin metal piece such as aluminum (the heat capacity is small so that it can respond to the ambient temperature change in a short time, and the surface is black and matte). Therefore, it can be measured by placing a device with a high emissivity.

When the calculation routine of the heat distribution Q _b by the liquid is started by the command of the keyboard 12, the CPU 104 reads the surface temperature T _s corresponding to one scanning address from the RAM 105, and RA
M105 from constant parameter _{α, ρ, c, V s} , reads the T _b, calculates the _{Q b = αρcV s (T b} -T s) t s, the calculation result is again stored in the RAM105 a predetermined area . This operation is repeated for all scan addresses and ends.

When the calculation routine of the radiant heat distribution Q _r is started by the instruction of the keyboard 12, the CPU 104 reads the surface temperature T _s corresponding to one scanning address from the RAM 105, and also reads the constant parameters K _r and T _w from the RAM 105. , Q _r = K _r (T _s ⁴ −T _w ⁴ ) is calculated, and the calculation result is stored again in a predetermined area of the RAM 105. This operation is repeated for all scan addresses and ends.

When the calculation routine of the conduction heat distribution Q _c is started by the instruction of the keyboard 12, the CPU 104 reads the surface temperature T _s corresponding to one scanning address from the RAM 105, and the constant parameters α, K _c , T _c , from the RAM 105. Read Is calculated, and the calculation result is stored again in a predetermined area of the RAM 105. This operation is repeated for all scan addresses and ends.

When the operation routine of the convection heat distribution Q _f is started by the instruction of the keyboard 12, the CPU 104 reads the surface temperature T _s and the ambient temperature T _a corresponding to one scanning address from the RAM 105, and the constant parameter K _f , D is read and calculates the ^{_{Q f = K f D -0.25 (}} T s -T a) 1.25, the operation result is again stored in the RAM105 a predetermined area. This operation is repeated for all scan addresses and ends.

When the calculation routine of the internally generated heat distribution Q _m is started by the command of the keyboard 12, the CPU 104 reads the surface temperature T _s corresponding to one scanning address from the RAM 105, and the RAM 1
Read the constant parameters M _o , T _m , t _s from 05, Is calculated, and the calculation result is stored again in a predetermined area of the RAM 105. This operation is repeated for all scan addresses and ends.

Each heat distribution Q _b , Q calculated as above and stored in RAM 105
_{The r} , Q _c , Q _f , Q _m will be displayed on the CRT 14 according to the display routine selected by the keyboard 12. For example, the CRT 14 is displayed as a pattern in shades or colors.

The parameters having different values depending on the body part can be separately obtained in advance and stored in the memory as parameters. Although these parameters have different values depending on the body part, they may be considered to be constant when measuring a specific part within one screen.
The same value can be used for a plurality of scanning addresses within one screen. Then, these parameters can be input from the keyboard, if necessary, when measuring a specific part within one screen. In addition, in the above-mentioned embodiment, the calculation result is calculated again in each distribution calculation.
Although it is stored in RAM105, each calculation result is
It is also possible to transfer directly to the screen buffer in the terminal device 13. In this case, the calculation routine also serves as the display routine.

〔The invention's effect〕

As described above, according to the present invention, since a plurality of heat distribution patterns can be calculated by one calculating means, the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic diagram for explaining the background of the present invention, FIG. 2 is a block diagram for explaining the constitution of the present invention, and FIG. 3 shows an embodiment of a thermal pattern calculation device according to the present invention. It is a block diagram. 1 ... Surface layer of object, 2 ... Deep part of object, 10 ... Memory and computing device (microcomputer), 11 ... Infrared imager, 12 ... Keyboard, 13 ... CRT terminal device, 14
…… CRT.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masahiro Iwatani 1424-17 Uehongo, Matsudo-shi, Chiba (72) Inventor Andai Kishida 1015 Uedotachu, Nakahara-ku, Kawasaki-shi, Kanagawa Fujitsu Limited (72) Inventor Atsushi Tanaka 1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited (56) References JP 57-180937 (JP, A) JP 54-62880 (JP, A) JP 56-161033 (JP JP, A)

Claims (1)

[Claims] 1. A device for measuring a heat pattern of an object, which comprises a surface layer part and a deep part located inside the surface layer part and in which a liquid flows, wherein a distribution of a surface temperature T _s of the surface layer part and the surface layer an infrared video storage means for storing the distribution of ambient temperature T _a of the part measured, the heat distribution by the liquid _{Q b = αρcV s (T b} -T s) t s, however, alpha, [rho, c, V _s , T _b , t _s respectively represent the counter current rate of the liquid, the density of the liquid, the heat capacity of the liquid, the flow rate of the liquid, the temperature of the liquid, the thickness of the surface layer portion, radiation Heat distribution Q _r = K _r (T _s ⁴ -T _w ⁴ ), where K _r is a constant and T _w is the background temperature of the object. However, α, K _c , and T _c are the counter current rate of the liquid, the conduction coefficient between the deep portion and the surface portion, respectively.
Convective heat distribution Q _f = K _f · D ^-0.25 (T _s -T _a ) ^1.25 indicating the temperature of the deep portion, where K _f is a constant and D is equivalent to the diameter of the body. Generated heat distribution However, M _o is a constant, T _m is equivalent to the average temperature in the surface layer of the object, t _s is the thickness of the surface layer, the calculation means for calculating, and the heat distribution obtained by the calculation means. And a heat distribution display means for displaying the heat pattern.