JPH02196933A - Infrared-ray detection device - Google Patents

Abstract

PURPOSE:To enhance the accuracy of detecting a temperature by correcting a temperature value with the temperature of a Fresnel lens in the case of detecting the temperature of a detection area based on the detected value of an infrared sensor. CONSTITUTION:The quantity of infrared light from the detection area 2 set in a specified space 1 in a room is condensed on the infrared sensor 11 by the Fresnel lens 10. Based on output from the infrared sensor 11, the quantity of the infrared light from the detection area 2 is arithmetically operated by a light quantity arithmetic operation means 50. After the value of the quantity of the infrared light is arithmetically operated to be converted into the temperature value of the detection area 2 by a conversion means 51, a signal concerning the specified infrared ray is outputted by a signal processing means 53. In such a case, since a lens temperature detecting means Th1 for detecting the temperature of the Fresnel lens 10 is arranged and the arithmetically operated value of the conversion means 51 is corrected based on the detected temperature, the effect of the radiant heat of the Fresnel lens 10 in which the temperature rises because of the absorption of the infrared ray is considered and the accuracy of detecting the temperature of the detection area 2 is enhanced.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to an infrared detection device that detects an infrared sensor and obtains an infrared signal based on the amount of infrared light in a detection area. Concerning measures to improve detection accuracy.

(Prior Art) Conventionally, as disclosed in, for example, Japanese Patent Application Laid-Open No. 62-175540, an infrared sensor installed in an indoor space is scanned, and an infrared light amount signal of the infrared sensor and a position signal at the time of scanning are detected. There is a well-known technology that attempts to maintain a uniform temperature distribution in the indoor space by measuring the temperature distribution in the indoor space and controlling the start/stop of the compressor of the air conditioner according to the temperature distribution. .

(Problems to be Solved by the Invention) By the way, in the above-mentioned infrared detection device, as a lens for focusing infrared rays from the detection area onto the infrared sensor, for example, from the viewpoint of practicality, cost, weight reduction, etc. A Fresnel lens made of a resin material such as polyethylene is used, but in that case, the transmittance of infrared rays is lower than that of a lens made of optical glass, and the infrared rays are easily absorbed by the Fresnel lens. Therefore, not only the infrared rays of the detection area but also the infrared rays of the Fresnel lens are incident on the infrared sensor.
This means that the temperature in the detection area cannot be accurately detected. Therefore, especially when detecting the amount of infrared light by sequentially scanning detection areas in an indoor space, the amount of infrared light in each detection area affects the detection accuracy of other detection areas, and the temperature distribution in each detection area There was a problem that it could not be detected accurately.

The present invention has been made in view of the above, and a first object of the present invention is to provide a means for correcting the temperature rise caused by infrared absorption of the Fresnel lens, thereby making use of an infrared sensor. The goal is to detect accurate temperature distribution.

In addition, especially as an infrared sensor, for example, a thermopile k
When using the detection area (
In the lens holder (b) placed opposite to a), a thermopile (C) is placed inside the lens holder (b), and a Fresnel lens (d) for condensing infrared light is placed in front of the lens holder (b).
Attach the lens holder to detect the hot junction temperature of the thermocouple with the sensor part (e) in the thermopile (C).

The amount of infrared light in the detection area (a) is detected by compensating the hot junction temperature with the detected value of the room temperature thermistor (f) placed outside of (b) in contact with the back side of the thermopile (C). ing.

That is, as shown in FIG. 14, the total voltage output with respect to the reference value of the thermopile corresponding to the radiating surface temperature, that is, the hot junction temperature Tbj of the thermopile is Vto, and the air temperature T
The voltage output with respect to the reference value of the thermistor corresponding to a is V
If tha is normally expressed as Vpl-Vto-Vtha, f) V pl is used as the voltage output of the thermopile, that is, the infrared light amount signal.

However, the above 71N constant is made on the assumption that the cold junction temperature Tcj of the thermopile is equal to the air temperature Ta, and in reality, the cold junction temperature is higher than the air temperature. Therefore, the conventional device described above has a problem in that the detection accuracy of the amount of infrared light further deteriorates.

A second object of the present invention is to detect a more accurate temperature distribution in an infrared sensor that uses a thermocouple by providing means for correcting errors caused by cold junction temperature in addition to correction based on the temperature of the Fresnel lens. There is a particular thing.

(Means for solving the problem) In order to achieve the above object, the first means for solving the problem is to detect a detection area (2) in a predetermined space (1) as shown in FIG.
The target is an infrared detection device that detects infrared rays.

The infrared detection device includes an infrared sensor (11) that generates an output according to the input infrared light m, and a Fresnel lens (11) that focuses infrared light from the detection area (2) onto the infrared sensor (11). 10), a light amount calculation means (50) which receives the output of the infrared sensor and calculates the amount of infrared light in the detection area (2), and calculates the infrared light ffi value calculated by the light amount calculation means (50) into the detection area ( 2) converting means (51) that performs conversion calculation into the temperature value, and the converting means (51)
A signal processing means (53) is provided which receives the output of step 1) and outputs a predetermined signal based on the temperature value of the detection area (2).

Further, based on the temperature of the Fresnel lens (10) detected by the lens temperature detecting means (TI+1) and the lens temperature detecting means (T h1), the converting means (51) detects the temperature of the Fresnel lens (10). ) is provided with a correction means (52) for correcting the temperature value of the detection area (2) calculated in the above steps.

The second solution is to add a hot junction (22) to the infrared detection device.
an infrared sensor (11) consisting of a thermopile that connects a large number of thermocouples having a cold junction (23) in series and outputs a voltage signal corresponding to the amount of infrared light input based on the potential difference generated between the two ends; , a Fresnel lens (10) that focuses infrared rays from the detection area (2) onto the infrared sensor (11), and a cold junction temperature detection means (that detects the temperature of the cold junction (23) of the infrared sensor (11)). T h2
), and a light amount calculation means () for calculating the amount of infrared light based on the voltage signal output from the infrared sensor (11) and the cold junction temperature detected by the cold junction temperature detection means (Th2).
50), a conversion means (51) that converts and calculates the infrared light amount value calculated by the light amount calculation means (50) into a temperature value of the detection area (2), and receives the output of the conversion means (51) and corrects it. A signal processing means (53) for outputting a predetermined signal based on the temperature value of the detected area is further provided, and a lens temperature detection means (Th1) for detecting the temperature of the Fresnel lens (10); Detection means (
Detection area (2) calculated by the conversion means (51) based on the temperature of the Fresnel lens detected by T h1)
A correction means (52) for correcting the temperature value is provided.

A third solution is to set a plurality of detection areas (2) in the first or second solution, and set a signal processing means (
53), each detection area (2) receives the output of the correction means (52) and adjusts the temperature value of each detection area (2) based on the corrected temperature value of the detection area (2).
, . . . is provided with temperature signal output means (54) for outputting a temperature distribution signal indicating the temperature distribution.

A solution to m4 is to set a plurality of detection areas (2) in the first or second solution, and to set a signal processing means (
53), each detection area (2) receives the output of the correction means (52) and adjusts the temperature value of each detection area (2) based on the corrected temperature value of the detection area (2).
, . . . and a human body signal output means (55) that outputs a human body position signal indicating the position of the human body. be.

(Function) With the above configuration, in the invention of claim (1), the amount of infrared light from the detection area (2) set in the predetermined space (1) is detected by the infrared sensor ( 11), and by the light amount calculation means (50),
Based on the output from the infrared sensor (11), the detection area (
After the infrared light amount in step 2) is calculated, and the conversion means (51) converts the infrared light amount value into a temperature value of the detection area (2), the signal processing means (53) outputs a signal related to a predetermined infrared light. be done.

In that case, a lens temperature detection means (Th1) is arranged to detect the temperature of the Fresnel lens (10), and the calculated value of the conversion means (51) is corrected based on the temperature. The effect of radiant heat from the Fresnel lens (10), which has increased in temperature, is taken into consideration, and the detection area (2)
temperature detection accuracy will be effectively improved.

In the invention of claim (2), in the process of calculating the temperature of the detection area (2) corrected by the temperature of the Fresnel lens (10), by the same effect as the invention of claim (1), the light amount calculation means (50), infrared sensor (11)
The amount of infrared light is calculated as the difference in temperature between the hot junction temperature detected by the thermopile and the cold junction temperature detected by the cold junction temperature detection means (Th2).

Therefore, accurate infrared light mts can be obtained without causing detection errors that occur when detecting the thermopile temperature and air temperature, and as a result, the temperature detection accuracy in the detection area (2) is improved. This will be a noticeable improvement.

(Example) Examples of the present invention will be described below with reference to FIGS. 3 to 13.

Figures 3 to jB8 show infrared ljI according to embodiments of the present invention.
The detection device is shown in the indoor space (1), (2) is the detection area for detecting the temperature distribution and human body position set in the indoor space (1), and (3) is the detection area in the indoor space (1). This is a ceiling-mounted air conditioner for air conditioning.

Above air side kimono fi! (3) has a built-in infrared detection device (4) for detecting infrared rays in the detection area (2) of the indoor space (1), and the infrared detection device (4) is installed in the eighth As shown in the figure, a substantially cylindrical lens holder (5) containing an infrared detection section, and a lens holder (
A substantially rectangular parallelepiped-shaped casing (6) that fixedly supports the casing (5), a U-shaped support frame (7) that supports the casing (6) rotatably around a horizontal axis on both sides thereof, and the support frame ( 7)
The support frame (7) and the lens holder (
5) Consists of a stepping motor (8) for rotating the entire unit around a vertical axis and a controller (9) for controlling the operation of the infrared detection device (4).

Here, as shown in FIG. 3, the lens holder (5)
A thermopile (11) as an infrared sensor that generates an output according to the amount of input infrared light is arranged inside the lens holder (5), and a detection area (2) made of polyethylene resin material is placed in front of the lens holder (5). A Fresnel lens (10) is attached to the thermopile (11) to focus infrared rays on the thermopile (11). Further, a lens thermistor (T111) as a lens temperature detection means for detecting the temperature of the Fresnel lens (10) is attached to the back side of the Fresnel lens (10), and inside the thermopile (11), A cold junction thermistor (Th2) is arranged as a cold junction temperature detection means for detecting the cold junction temperature, which will be described later. Note that (T h3) is an air temperature thermistor placed outside the lens holder (5) in contact with the back side of the thermopile (11) to detect the ambient air temperature.

4 to 16 show the structure of the thermopile (11), (15) is a cylindrical frame of the thermopile (11), (16) is a substrate provided at the bottom of the frame (15), A square metal plate (17) for absorbing infrared rays is arranged inside the frame (15) and the substrate (16). Also, (18
) is an organic film on which the gold black (17) is placed, (19)
The gold black (
17), and is a ceramic heat sink for absorbing heat.

Then, on the back side of the organic film (18), the gold black (
A sensor section of a thermopile (11) consisting of a thermocouple is provided at a position corresponding to 17). The sensor part (2
0) is the electrode (2)).

(2)) It is made of a conductive material that connects the gold black (17), and has four folded parts corresponding to each side of the gold black (17). That is, 1 of gold black (17)
It is folded so that it alternately reciprocates between the inside and the outside along two sides, and two dissimilar metals (N
For example, bismuth and antimony) are connected alternately in series. One of the dissimilar metal junctions (22) and (23>) is located inside the gold black (17), and is a hot junction that detects the temperature of the gold black (17) whose temperature has increased due to infrared rays, that is, the amount of infrared light. (22).Also,
The other is a cold junction (23) located outside the gold black (17) for calibrating the temperature of the hot junction (22).
It becomes. Therefore, the voltage value obtained by integrating the potential differences that occur at the junction of each dissimilar metal is the electrode (2) at both ends.
, (2)), and from that voltage value the hot junction (22)
It is designed to detect the temperature of

The aforementioned cold junction thermistor (Th2) is attached in contact with this cold junction (23), and electrodes (2)), (2) are generated in response to the temperature of the hot junction (22).
) is calibrated using the cold junction temperature.

In addition, (24), . 25) is a filter attached to the upper window of the frame (15) for cutting low wavelength components of 5 microns or less.

Next, FIG. 9 shows the control contents of the controller (9), and in step S1, the switch (
(not shown) is turned on, and in step S2, an initial setting is made to set the stop position θ0 of the stepping motor (8) as the initial value of the position signal θ, and in step S3, the stepping motor (8) is driven to Lens holder (5)
The whole is rotated around a vertical axis to continuously scan the detection area (2) within the indoor space (1). Next, step S4,
5SIS6 sequentially inputs the output signal of the thermopile (11), calculates the temperature T from the infrared signal, and reads the position θ at that time. An infrared signal value Vp of the thermopile (11) corresponding to a predetermined amount of light set in advance as a threshold value.

A new threshold value Vp is determined by extraction based on the formula % (where To is the initial temperature).

Then, in step S8, it is determined whether the light amount signal V output as a voltage value by the thermopile (11) is equal to or greater than the threshold value Vp, and if it is equal to or greater than Vp, a human body position signal is sent to notify the presence of a human body in step SU. While outputting v
7><v When lower than p, a temperature distribution signal corresponding to the amount of infrared light is output in step S9.

That is, as shown in FIG. 11, the change in room temperature with respect to the position θ of the detection area (2) (track $14 in the figure) is output as a temperature distribution signal, and when the light amount signal V is equal to or higher than the threshold value Vp, the change in the temperature of the human body is The presence and its position θp are output as a human body position signal.Also, as shown in FIG.
By changing the temperature T according to the average value of the temperature T, the detection accuracy according to the background state is maintained.

When the detection of infrared rays in the predetermined sampling period is completed as described above, the above # control is performed in step S11 until θ-2nπ is reached, that is, until the indoor space (1) is rotated once,
After one rotation, it is determined in step S12 whether or not the switch is in the on state. If the switch is not on, the control ends, and if it is on, the above control is repeated.

Further, FIG. 10 shows the subroutine of step Ss, in which each sensor (11), (Th1) is connected to R.

(T h2) is input, and in step R2, the cold junction thermistor (
The voltage difference Vpi corresponding to the amount of infrared light is calculated by subtracting the detected value v thcj of T h2), and in step R3, the voltage difference Vpi is converted to a temperature difference ΔT. In step S4, the lens The temperature Tl of the Fresnel lens (10) detected by the temperature thermistor (Th1) is subtracted and corrected to calculate the temperature T of each detection area (2).

In the above control flow, in the invention of claims (1) and (2), in step R2, the infrared light amount Vpi
In step R3, a conversion means (51) converts the infrared light amount value Vpl calculated by the light amount calculation means (50) into a temperature value ΔT of the detection area (2). is configured. Further, in step R4, a correction means (52) corrects the infrared light amount value calculated by the light amount calculation means (50) with the lens temperature Tl detected by the lens thermistor (lens temperature detection means) (T111). ) is configured, and steps 86-
The SIO constitutes a signal processing means (53) which receives the output of the converting means (51) and outputs a predetermined signal based on the amount of infrared light in the detection area (2), .

In particular, in the invention of claim (3), step S9 constitutes a temperature signal output means (54) that outputs a temperature distribution signal indicating the temperature distribution of each detection area (2), etc.; ), the temperature signal output means (54)
In addition, in step 5lll, human body signal output means (55) outputs a human body position signal indicating the location of the human body.
is configured.

Therefore, in the invention of claim (1), the indoor space (1)
The amount of infrared light from the detection area (2), ... set in
), the light amount calculating means (50) calculates the amount of infrared light Vp1 in the detection area (2) based on the infrared signal Vto output from the infrared sensor (11). Then, the converting means (51) converts the infrared light fiVpl into
is converted into the detected temperature value ΔT of the detection area (2),
The signal processing means (53) performs predetermined signal processing based on the detected temperature value ΔT of the detection area (2), and outputs a signal necessary for controlling equipment such as an air conditioner.

In that case, a lens thermistor (lens temperature detection means) (T h1) is arranged to detect the temperature of the Fresnel lens (10), and the detected temperature value ΔT is corrected based on the temperature Tp. The influence of radiant heat of the Fresnel lens (10) whose temperature has increased due to absorption is considered. In other words, the total amount of heat that enters the light receiving surface of the infrared sensor (10) is radiated from the Qss radiation surface and is transferred to the infrared sensor (10).
0) is the amount of heat entering the light receiving surface of the Fresnel lens (
Let Qg be the amount of heat emitted from the infrared sensor (11) and entering the light receiving surface of the infrared sensor (10), then the relationship Qs - Qp (T) + QΩ CTI) is given to the actual temperature value T of the detection area (2). be.

Here, since the detected temperature value ΔT is a function of the total heat mQs, ΔT=g(Qs) On the other hand, the output voltage Vpl of the thermopile (10) is a function of ΔT, and is Vplf(ΔT). That is, from each of the above equations, T=Qp-'[g-'(ΔT) -QD (TJ7
)], the detected temperature value ΔT and the lens temperature TJ7
Based on this formula, the correction means (52) calculates
A corrected temperature value T of the detection area (2) is calculated.

Therefore, according to the invention of claim (1), it is possible to improve the accuracy of detecting the temperature T of the detection area (2).

In the case of the invention of claim (1), the infrared sensor is not limited to the thermopile (11) in the above embodiment, but may be a thermistor that utilizes changes in electrical resistance due to temperature, a single thermal lightning pair, etc. This can also be applied to other sensors.

Next, in the invention of claim (2), the process of calculating the temperature T of the detection area (2) corrected by the temperature TI of the Fresnel lens (10) by the same effect as the invention of claim (1) above. , the light amount calculation means (50) calculates the temperature difference between the hot junction temperature Thj detected by the thermopile (11) and the cold junction temperature Tcj detected by the cold junction sensor (cold junction temperature detection means) (Th2). Infrared light jlVpl
is calculated.

Here, in the conventional thermopile, as shown in FIG. 14, the detected value Vto of the thermopile corresponding to the temperature Thj of the hot junction (22) and the detected value Vtha of the air temperature thermistor (T ha) corresponding to the air temperature Ta. The difference between Vpl (
=Vto-Vtha) is taken as the infrared light amount value. This is based on the assumption that the air temperature Ta and the cold junction temperature TcJ are equal, but as shown in FIG.
In the conventional thermopile, an error of Vthcj-Vtha occurs.

In contrast, in the present invention, a cold junction thermistor (Th2) is arranged in contact with the cold junction (23), and the value V corresponding to the hot junction temperature Thj detected by the thermopile (11) is
The amount of infrared light Vpl is calculated from the difference vpt between to and the value Vthcj corresponding to the cold junction temperature Tcj detected by the cold junction thermistor (Th2).

Therefore, together with the temperature-based correction effect of the Fresnel lens (10) similar to the invention of claim (1) above, the temperature detection accuracy of the detection area (2) can be more significantly improved.

In addition, in the invention of claim (2), the air temperature thermistor (Tha) is not necessarily required to detect infrared rays.

In the invention of claim (3), a plurality of detection areas (2), ... are provided in the indoor space (1), and a signal processing means (5) is provided.
As the effect of 3), based on the corrected temperature value T of the detection area (2), . . . obtained by the effect of the invention of claim (1) or (2), the temperature signal output means (54)
A temperature distribution signal of each detection area (2), . . . is output. Therefore, by using the signal for air conditioning, the temperature distribution within the indoor space (1) can be made uniform, and comfortable air conditioning can be performed.

In the invention of claim (4), a plurality of detection areas (2), ... are provided in the indoor space (1), and a signal processing means (5) is provided.
As the effect of 3), the corrected temperature T of each detection area (2) obtained by the effect of the invention of claim (1) or (2) above.
Based on this, the temperature signal output means (54) outputs a temperature distribution signal regarding the temperature distribution of each detection area (2), etc., and the human body signal output means (55) detects the presence of a human body. A human body position signal for area (2) is output. Therefore, by utilizing these signals for air conditioning, in addition to the effect of the invention of claim (3) above, it is possible to perform more comfortable air conditioning that is suitable for the sensible temperature of the human body.

(Effects of the Invention) As explained above, according to the invention of claim (1), the infrared rays of the detection area are focused on the infrared sensor by the Fresnel lens, and the temperature of the detection area is detected based on the detected value of the infrared sensor. When doing so, the temperature value is corrected using the temperature of the Fresnel lens, so it is possible to measure the influence of infrared rays from the Fresnel lens, which absorbs infrared rays and increases the temperature, thus improving temperature detection accuracy. can be achieved.

According to the invention of claim '2J, when a thermopile is used as an infrared sensor, the cold junction temperature is detected and the infrared light amount value is calculated from the detected value of the thermopile and the cold junction temperature. (1) Since the same correction based on the lens temperature as in the zero invention is performed, the temperature detection accuracy can be improved more markedly.

According to the invention of claim (3), a plurality of detection areas are provided in a predetermined space, and each detection area is detected based on the corrected temperature of each detection area obtained by the invention of claim (1) or (2). Since a temperature distribution signal indicating the temperature distribution in the area is output, that signal can be used for air conditioning to equalize the indoor temperature distribution and provide information for comfortable air conditioning. (can do.

According to the invention of claim (4), a detection area for the number of abdomens is provided in a predetermined space, and based on the corrected temperature of each detection area obtained by the invention of claim (1) or (2),
Since it outputs a temperature distribution signal indicating the temperature distribution of each detection area and a human body signal indicating the location of the human body,
This signal can be used for air conditioning to provide information to equalize the indoor temperature distribution and provide comfortable air conditioning that matches the human body's sensations.
(can do.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing the structure of the invention of claim (1), (3) or (4), and Figure 2 is claim (2], +3).
Or it is a block diagram showing the composition of invention of (4). 3 to 13 show embodiments of the present invention, in which FIG. 3 is a side view showing the vertical section of the lens holder in the upper half, FIG. 4 is a partial sectional view showing a part of the inside of the thermopile, and FIG. 5 is a plan view of the sensor section of the thermopile, FIG. 6 is a perspective view showing the entire thermopile, FIG. 7 is a perspective view showing the state of the indoor space, and FIG. 8 is a perspective view schematically showing the infrared detection device. FIG. 9 is a flowchart showing the control contents of the controller, FIG. 10 is a flowchart showing the control subroutine of FIG. 9, FIG. 11 is a characteristic diagram showing the relationship between the output signal of the infrared sensor and the threshold value, and FIG. The figure is a characteristic diagram showing a method of changing the threshold value, and FIG. 13 is an explanatory diagram illustrating the removal of errors by detecting the amount of infrared light using the thermopile cold junction temperature. 14 and 15 show a conventional example, and FIG. 14 is an explanatory diagram showing a normal infrared light amount detection method of a thermopile,
FIG. 15 is an explanatory diagram showing the principle of conventional infrared measurement. (1)... Indoor space, (2)... Detection area, (1
0) Fresnel lens, (11) Thermopile (infrared sensor), (22) Hot junction, (23)
...cold junction, (50) ...light amount calculation means, (51)
... conversion means, (52) ... correction means, (53).
... signal processing means, (54) ... temperature signal output means,
(55)...Human body signal output means, (T h1)...
Lens thermistor (lens temperature detection means), (Th2)
...Cold junction thermistor (cold junction temperature detection means). Figure 2 Figure 1 Figure 6 Figure 5 Figure 3 Figure 4 Figure 14 Figure 15

Claims (4)

[Claims] (1) An infrared detection device for detecting infrared rays in a detection area (2) in a predetermined space (1), comprising an infrared sensor (11) that generates an output according to the amount of input infrared rays; A Fresnel lens (1) focuses infrared rays from the detection area (2) onto the infrared sensor (11).
0) and the output of the above infrared sensor, the detection area (
2) a light amount calculation means (50) for calculating the amount of infrared light;
Conversion means (51) for converting the infrared light amount value calculated by the light amount calculation means (50) into a temperature value of the detection area (2);
) and the output of the converting means (51), the detection area (
2), a signal processing means (53) for outputting a predetermined signal based on the temperature value, and a lens temperature detection means (Th1) for detecting the temperature of the Fresnel lens (10); Th1)
Based on the temperature of the Fresnel lens (10) detected by
An infrared detection device comprising: a correction means (52) for correcting the temperature value of the detection area (2) calculated by the conversion means (51). (2) An infrared detection device for detecting infrared rays in a detection area (2) in a predetermined space (1), comprising a number of thermocouples having a hot junction (22) and a cold junction (23) connected in series. An infrared sensor (11) consisting of a thermopile that connects and outputs a voltage signal according to the amount of infrared light input based on the potential difference generated at both ends, and an infrared sensor (11) that collects infrared light from the detection area (2). A glowing Fresnel lens (10) and the above-mentioned infrared sensor (11)
cold junction temperature detection means (23) for detecting the temperature of the cold junction (23);
Th2), a light amount calculation means (50) for calculating the amount of infrared light based on the voltage signal output from the infrared sensor (11) and the cold junction temperature detected by the cold junction temperature detection means (Th2), and the light amount A conversion means (51) that converts the infrared light amount value calculated by the calculation means (50) into a temperature value of the detection area (2), and a temperature value of the detection area corrected by receiving the output of the conversion means (51). A signal processing means (53) that outputs a predetermined signal based on the value, a lens temperature detection means (Th1) that detects the temperature of the Fresnel lens (10), and the lens temperature detection means (Th1)
An infrared detection device comprising: a correction means (52) for correcting the temperature value of the detection area (2) calculated by the conversion means (51) based on the temperature of the Fresnel lens detected by the infrared detection device. (3) A plurality of detection areas (2) are set, and the signal processing means (53) receives the output of the correction means (52),
It is characterized by comprising a temperature signal output means (54) that outputs a temperature distribution signal indicating the temperature distribution of each detection area (2), based on the corrected temperature value of the detection area (2). The infrared detection device according to claim (1) or (2). (4) A plurality of detection areas (2) are set, and the signal processing means (53) receives the output of the correction means (52),
Temperature signal output means (54) that outputs a temperature distribution signal indicating the temperature distribution of each detection area (2), based on the corrected temperature value of the detection area (2), and a human body that indicates the location of the human body. Human body signal output means (55
) or (1)
2) The infrared detection device described above.