JPH0454935A - Non-contact type body heat measuring apparatus - Google Patents

Abstract

PURPOSE:To enable measuring of body heat quickly without fear of infecting a disease or the like by determining an absolute value of body heat of a living body based on an output signal as obtained with the impinging of infrared rays from the living body into an infrared sensor and an output signal corresponding to a temperature obtained from a temperature measuring means with an infrared rays intercepting/passing means being cut. CONSTITUTION:A signal indicating an absolute value of body heat of a living body from a signal involving infrared rays alone corresponding to the body heat of the living body is obtained from signal processing means 31, 32, 34, 36, 40 and 42 based on an output signal obtained with the impinging of infrared rays from the living body into an infrared sensor 26, as an infrared rays intercepting/passing means 22 is opened, and an output signal corresponding to a temperature to be obtained from a temperature measuring means 23 with the infrared rays intercepting/passing means 22 being cut. Thus, the absolute value of the body heat of the living body alone is determined to be shown on a display means 47, thereby enabling non-contact measurement of body heat quickly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a non-contact body temperature measuring device suitable for non-contact measurement of the body temperature of a living body.

[Summary of the invention]

The present invention relates to a non-contact body temperature measurement device suitable for non-contact measurement of the body temperature of a living body. , a temperature measuring means for measuring the temperature of the infrared blocking and passing means, a signal processing means for outputting a signal indicating the absolute value of the body temperature of the living body from the output signals from the infrared sensor and the temperature measuring means, and an absolute value of the body temperature of the living body. The infrared ray blocking and passing means are opened, and the infrared rays from the living body are incident on the infrared sensor, and the output signal obtained from the infrared sensor and the infrared ray blocking and passing means are blocked and the output signal obtained from the temperature measuring means is displayed. By determining the absolute value of a living body's body temperature from a signal related only to infrared rays that corresponds to the body's body temperature, based on the output signal corresponding to the temperature of This device allows you to measure your body temperature without having to worry about it.

[Conventional technology]

Conventionally, a mercury thermometer has been known as a means for measuring the body temperature of a living body. Additionally, digital thermometers that indicate body temperature numerically are widely used. This digital thermometer has a temperature sensing section such as a thermistor or semiconductor temperature sensor that detects temperature by contacting the living body, and a temperature signal processing section that processes the signal obtained from this temperature sensing section into a value corresponding to body temperature. , an LCD display section for numerically displaying body temperature. The measured body temperature is then displayed as a numerical value, so that it can be read quickly.

[Problem to be solved by the invention]

However, both mercury thermometers and digital thermometers take a relatively long time, for example 45 seconds, to accurately determine body temperature, making it difficult to quickly measure body temperature. This imposes a burden on the person to be measured, such as a patient, and furthermore, since the temperature is detected by contacting the human body, there is a risk of contagion of diseases and the like.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide an excellent non-contact body temperature measurement device that can quickly measure body temperature without contact and without causing the risk of transmitting diseases.

[Indispensable means to solve problems]

For example, as shown in the non-contact body temperature measuring device of FIGS. 1 to 5, the present invention includes an infrared sensor (26) and an infrared ray for blocking or passing infrared rays incident on the infrared sensor (26). blocking and passing means (22);
A temperature measuring means (23) that measures the temperature of the infrared blocking and passing means (22), and outputs a signal indicating the absolute value of the body temperature from the output signals from the infrared sensor (26) and the temperature measuring means (23). Signal processing means (31) (3
2) (34) (36) (40) (42) and display means (47) for displaying the absolute value of the body temperature, and when the infrared ray blocking and passing means (22) is opened, the infrared rays are removed from the body. Based on the output signal obtained when infrared rays are incident on the infrared sensor (26) and the output signal corresponding to the temperature obtained from the temperature measuring means (23) when the infrared blocking and passing means (22) is cut off, the temperature of the living body is determined. This method is characterized by determining the absolute value of the body temperature from a signal related only to infrared rays corresponding to .

[Effect]

According to the non-contact body temperature measurement device of the present invention, the signal processing means (31) (32) (34) generates a signal indicating the absolute value of the body temperature from a signal related only to infrared rays corresponding to the body temperature.
(36) (40) Obtained from (42), that is, the infrared blocking and passing means (22) is opened and the infrared rays from the living body are incident on the infrared sensor (26), and the output signal and infrared blocking and passing are obtained. Based on the output signal corresponding to the temperature obtained from the temperature measuring means (23) when the means (22) is shut off, the absolute value of the body temperature of only the living body is determined from the signal obtained here, and the body temperature of this living body is determined. By displaying the absolute value, body temperature can be measured quickly without contact.

〔Example〕

Hereinafter, embodiments of the non-contact body temperature storage device of the present invention will be described in detail with reference to the drawings.

In FIG. 1, (10) indicates a person (living body), and (12) indicates the first value of the value corresponding to the level of infrared rays I emitted from each part of the person (10). A temperature detection unit is shown that sends out a detection signal S2 indicating the temperature of a member of the shutter (22), which will be described later. Furthermore, (14) is obtained by calculating the absolute value of the body temperature of the living body (10) from the value (voltage) of the second detection signal S2 indicating the input shutter temperature and the first detection signal Sl. This is a signal processing and display unit that stores and displays the absolute value of body temperature.

In order to measure the body temperature of a desired part of the person (10), the temperature detection part (12) is entirely movable so as to accurately detect the infrared rays 8 emitted from that part, and is made of a cylindrical member. A condensing lens (objective lens) (20) is provided near one opening (18) of (16).Furthermore, a shutter (22) is disposed after the condensing lens (20). , this shutter (22) is a driving part (24)
Opening or blocking is performed by driving.

This blocks or allows infrared radiation incident from the condenser lens (20) to pass through.

Furthermore, the absolute value (1) of the temperature detected from the member and the value of the second detection signal S2 (
A temperature detecting element (23) such as a thermistor or a semiconductor sensor whose value (Vs) changes according to a -order function is attached with an adhesive or the like.

Further, a pyroelectric infrared sensor (26) is provided at the bottom (16a) of the cylindrical member (16) behind the shutter (22), and the shutter (22) is momentarily opened (for example, for 1 second). When this infrared sensor (26) detects a person (
The infrared rays IRa emitted from the measurement site 10) are incident through the condensing lens (20) and the shutter (22), and a first detection signal S1 indicating a voltage having a corresponding value is sent out. . Here, a pyroelectric infrared sensor (2
6) shows the output characteristics shown in FIG. That is, the value of the first detection signal S1 (voltage vout) and the person (
10), the measurement site temperature T (t) is expressed by the following formula (
1).

Vout = f (T) - (1)
The first detection signal S l and second detection signal S2 obtained in this way are supplied to the input terminals T11 and T12 of the signal processing and display section (14), and then to the amplifiers (31) and (32). are input respectively. Here, it is amplified to a predetermined value, and then the A/D converter (34) (36)
The digital first detection signal Sl that is manually quantized
d and a digital second detection signal S2d are output. Furthermore, the microprocessor (MP) calculates and obtains the absolute value (1) of the body temperature of the measurement site of the person (10) based on the digital first detection signal S+d and the digital second detection signal S2d.
U) (40) is provided. 20 The MPU (40) is a CPU (40a) that performs a well-known control process, and a program related to the calculation here is stored, as well as a second detection signal S2 output from the temperature detection element (23).
From the value of , the absolute value of the member temperature of the shank (22) (1>
ROM (40b) that includes a conversion table (lookup table) obtained by converting
, a working RAM (40c), a digital first detection signal Sld, and a digital second detection signal S.
I10 port (40d) (40e) (4
0f). The MPU (40) is also provided with a measurement instruction switch (42) for instructing the start of measuring the body temperature of the measurement site of the person (10).

FIG. 3 shows the above external configuration.

A condenser lens (20) is disposed in one opening (18) of a substantially rectangular cylindrical member (16) into which infrared radiation emitted from a person (10) is incident, and a condensing lens (20) is disposed in one opening (18) of the substantially rectangular cylindrical member (16). 16
) are provided with a measurement instruction switch (42) for instructing the start of body temperature measurement, a display such as an LCD (47), and a power on/off switch (49).

Next, the operation related to the above configuration will be explained based on the flowchart of FIG. 4.

After the entire operation, in order to measure the body temperature of a desired part of the person (10), the condensing lens (20) of the temperature detection part (12) is
) to face the part. Then, press the measurement instruction switch (4
2) is turned on, the program stored in the ROM (40b) of the MPU (40) starts, and in step 100, the control signal S4 for closing the shutter (22) is sent to the drive unit (24). will be sent to. Subsequently, in step 101, the second detection signal S2 from the temperature detection element (23) attached to the member of the shutter (22), that is, the signal that detects the absolute value of the temperature of this member, is sent to the amplifier (32). ) via the A/D converter (
36) and the digital second detection signal S2d obtained here is sent to the CPU (40) of MPU (40).
a) Capture by control of. Further step 102
Now, the captured digital second detection signal S2d is R
It is stored in the corresponding area of A M (40c). Furthermore, in step 103, the MPU (40) claw drive unit (
24), for example, a control signal S4 that is ON for opening the shutter (22) for one second is sent.

Subsequently, in step 104 (auxiliary operation), the shutter (22) is opened for one second by actuation of the drive section (24) based on the control signal S4. Here, the condenser lens (
The infrared rays I□ focused by 20) are sent to the infrared sensor (26)
is incident on the This infrared sensor (26) sends out a first detection signal S1 of a voltage v out corresponding to the level of the infrared ray 11a based on the output characteristics shown in FIG. 2. Furthermore, in step 105, the amplifier (31) to which the first detection signal S is supplied, and the A/D converter (
34) The digital first detection signal Sld obtained via
CPU (4[1a) of M P U (40)
The data is taken in under the control of

In step 106, it is determined whether the first digital detection signal S+d has been captured. If NO, that is, the body temperature of the desired part of the person (10) is detected by the infrared sensor (2).
6) is not detected normally, step 103
Return to , and repeat the detection of infrared rays■. If Yes, the process proceeds to step 107, and the captured digital first detection signal S Id is stored in a different area from the corresponding digital second detection signal S2d of the RAM (40C). Furthermore, in step 108, the RAM
(40c) The digital second detection signal S2d stored in the CPU (40a) is read out to the work area under the control of the CPU (40a). In step 109, based on the voltage value of the read digital second detection signal S2d, 20M
(40b) Obtain the absolute value (°C) of the temperature of the member of the shutter (22) using the conversion table stored in (40b). Furthermore, in step 110, the absolute value (1) of the temperature of the member of the shutter (22) is set as (Ts), and the output characteristics of the temperature detection element (23) and the infrared sensor (26) shown in FIG. Vout = f (T) in equation (1)
The calculation is performed on the assumption that the body temperature (T) measured at is the value (Ts ), and the voltage Vs corresponding to the value (voltage vout ) of the first detection signal S1 is obtained. Subsequently, in step 111, the digital first detection signal Sld stored in RAM (40c) is converted to cPU (40a
) is read out to the work area under the control of

Furthermore, in step 112, the read digital first
The voltage value Vout of the detection signal Sld is the measured body temperature (T
) The absolute value To of the body temperature of the measurement site of the person (10) on
Convert to . Here, first, the voltage Vs related to the absolute value of the temperature of the shutter (22) obtained in step 110 and the voltage value VOut of the digital first detection signal Sld are calculated as the output of the infrared sensor (26) shown in FIG. Formula (1) showing the characteristics
Convert from Vout = f (T).

That is, when the shutter (22) is momentarily opened, the voltage value Vou detected by the infrared sensor (26)
t is obtained by subtracting the voltage Vs corresponding to the temperature of the shutter (22) from the voltage VO corresponding to the desired body temperature of the specific region using the following equation.

Vout = Vo - Vs - (2), therefore, Vo = Vout + Vs - (3), and Vo = f (TS), and the absolute value of body temperature (t) To at the measurement site is:
To = f-' [Vout +Vs] - (4).

In step 113, the person obtained in this way (1
The absolute value (t)To of the body temperature at the measurement site of 0) is displayed on the display (4).
7) Display in body temperature display field M.

Here, the absolute value To of the body temperature of the desired measurement site of the person (10)
The program ends, and then returns to the start and becomes ready to measure the next absolute value TO of body temperature.

In this way, first, the shutter (22
) is momentarily opened and infrared rays 1. are emitted from a desired part of the person (10). is incident on the infrared sensor (26) to obtain the corresponding voltage value Vout. Furthermore, the shutter<
22) is detected by the temperature detection element (23), and this signal is calculated from the output characteristics of the infrared sensor (26) to obtain the voltage Vs corresponding to the shutter temperature. Based on the signal obtained by detecting infrared rays incident when the shutter (22) is opened and Vo corresponding to the temperature of the shutter (22), that is, the voltage V related to the infrared ray (2) of the body temperature only.

The absolute value of body temperature To(t) can be found from . Furthermore, by visually displaying the absolute value of the body temperature, the body temperature can be measured quickly without contact.

FIG. 5 shows another embodiment. In the above example, the voltage V
Equations (1) (2) of M P U (40) corresponding to the output characteristics of the temperature detection element (23) from s and the voltage value VO
(3) The absolute value (t)To of the body temperature of the measurement site of the person (10) is determined by the calculation process in (4), but in this example, the calculation processes in equations (1) to (4) are distinguished. This is done using a converted conversion table (ROM). That is, the first detection signal S1 and the second detection signal S2 are connected to the amplifier (31).
(32), it is input to a first processing circuit (50) that processes f (Ts) and a second processing circuit (52) that processes f-' (Vo). The first processing circuit (50) converts the second detection signal S2 into a digital signal using the A/D converter (54), and then converts the second detection signal S2 into a digital signal in the first conversion ROM (56) of the data conversion memory as in the above embodiment. f(Ts), that is, a value similar to the voltage Vs.Subsequently, the D/A converter (58) converts it into an analog signal, and at the same time, the amplifier (31) performs the first detection. The signal S1 is added by an adder (60).

The added signal here is converted into a digital signal by the A/D converter (62) of the second processing circuit (52), and then converted into a digital signal by the second conversion ROM (64) which is a data conversion memory. By performing a similar transformation of f-' (Vo), TO=f-' according to equations (2), (3), and (4):
Vout=Vs] is performed to obtain the absolute value (t) To of body temperature. Note that measurement control and display signal processing are the same as in the above embodiments, and their explanations will be omitted.

Furthermore, without being limited to the above embodiment, the first detection signal S
1 and the second detection signal S2 as analog signals may be subjected to similar signal processing via a broken line approximation circuit to obtain the absolute value (t) To of body temperature.

It is clear that the present invention is not limited to the above-described embodiments, and that various changes can be made without departing from the gist of the present invention.

〔Effect of the invention〕

As can be understood from the above description, according to the non-contact body temperature measuring device of the present invention, a signal indicating the absolute value of the body's body temperature can be obtained from a signal related only to infrared rays corresponding to the body's body temperature in a non-contact manner. This has the advantage that body temperature can be measured quickly and without the risk of transmitting diseases.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of an embodiment of the non-contact body temperature measuring device of the present invention, FIG. 2 is an output characteristic diagram of an infrared sensor used to explain the operation of the embodiment shown in FIG. 1, and FIG. FIG. 4 is a perspective view showing the external configuration of the embodiment shown in FIG. 1, FIG. 4 is a flowchart for explaining the operation of the embodiment shown in FIG. 1, and FIG. 5 is a block diagram showing the structure of main parts of another embodiment. (10) is a person, (12) is a temperature detection unit, (14) is a signal processing and display unit, (22) is a shutter, (23) is a temperature detection element, (26) is an infrared sensor, (40) is an MP
U, (47) is the display, Sl is the first detection signal, S
2 is the second detection signal, S2a is the digital second detection signal, S+a is the digital first detection signal, and ■8 is infrared rays. Figure 3 S2

Claims (1)

[Scope of Claims] An infrared sensor, an infrared blocking and passing means for blocking or passing infrared rays incident on the infrared sensor, a temperature measuring means for measuring the temperature of the infrared blocking and passing means, and the infrared sensor. and a signal processing means for outputting a signal indicating the absolute value of the body temperature of the living body from the output signal from the temperature measuring means, and a display means for displaying the absolute value of the body temperature of the living body, wherein the infrared blocking and passing means is opened. The temperature of the living body is measured based on the output signal obtained when infrared rays from the living body are incident on the infrared sensor, and the output signal corresponding to the temperature obtained from the temperature measurement means when the infrared ray blocking and passing means is blocked. A non-contact body temperature measuring device characterized by determining the absolute value of a living body's body temperature from a signal related only to infrared rays corresponding to the body temperature.