JPH0443929A - Scanning type noncontact temperature measuring instrument and air conditioner using same - Google Patents

Abstract

PURPOSE:To realize the scanning type noncontact temperature measuring instrument by measuring temperatures in respective measurement areas on a time- division basis by one infrared detector, a fixed shield plate, and one driving system. CONSTITUTION:A motor 3 rotates a Fresnel lens 2 around a sensor 1 for scanning. At this time, only an infrared-ray image of an area which is seen through the Fresnel lens 2 is formed on the sensor 1. Further, slits 5 are arranged at the borders of the respective areas so as to cut off infrared rays from a measurement area when a lens moves to a position where it overlaps with a slit as shown in a figure, so the sensor 1 detects only the irradiation from the slit right before the Fresnel lens moves to the position where the respective areas are measured. Consequently, the temperature of each area can be measured from the difference between the temperature of the slit measured by a thermocouple 6 and the temperature found from the output of the sensor 1 in each area.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a scanning type non-contact temperature measuring device that detects radiated infrared rays, which is mainly used for detecting indoor temperature conditions, etc., and an air conditioner using the same.

2. Description of the Related Art Conventionally, non-contact temperature measurement devices for measuring the temperature of each region include those that use an infrared detector for each region or a scanning reflector. However, all of them had the problem that their configurations were complicated and it was difficult to reduce their size and price.

In recent years, research has begun on scanning non-contact temperature measurement devices as industrial measuring instruments such as line scanners and sensors for detecting indoor conditions in air conditioners such as air conditioners. A conventional example is JP-A-53-41279.

Hereinafter, an example of the above conventional scanning type non-contact temperature measurement device will be described with reference to the drawings.

A rotating disk 14 is connected to a motor 12 that rotates at a constant speed via a motor rotating shaft 13.

A bin 15 is provided on the rotating disk 11 and a connecting arm 18
It is connected to the scanning reflecting mirror 16 via.

The scanning reflector 16 rotates around a support shaft 17 and is scanned by the motor 12 so as to cover the entire measurement target 19 . The infrared rays entering the scanning reflector 16 are reflected by the reflector 20.
21 , is condensed by a condensing lens 23 , passes through a rotating sector 22 and reaches an infrared detector 24 .

The operation of the scanning type non-contact temperature measuring device configured as above will be explained below.

The rotational movement of the motor 12 is transmitted to the scanning reflecting mirror 16 via the connecting arm 18, and the scanning reflecting mirror 16 performs a reciprocating rotational movement. Infrared rays emitted from each point of the measurement object 19 scanned by the reciprocating rotational movement of the scanning reflector 16 are reflected by the reflector 20.21, condensed by the condensing lens 23, and sent to the infrared detector. Sent to 24th. Infrared detector 2
The rotary sector 22 provided on the front side of the disc is rotated by the motor 12, and has a cutout around the disc so that infrared rays are transmitted only in one direction when the scanning reflector 16 rotates. Temperature distribution can be measured.

Problems to be Solved by the Invention In such a conventional configuration, two
This method requires two moving parts, has a complicated structure, and is difficult to assemble and adjust, and is also difficult to miniaturize.

The present invention solves these problems, and is a compact device that uses only one infrared detector and one drive system, and that can time-divisionally measure each measurement area with the infrared detector fixed. The aim is to create a low-cost scanning type non-contact temperature measuring device.

Means for Solving the Problem In order to solve this problem, the scanning type non-contact temperature measurement device of the present invention includes: an infrared detector; a lens that forms an infrared image of an object on the infrared detector; It consists of a drive system that rotates the lens around the infrared detector, and a shielding plate that partially blocks infrared rays.

Function: By rotating the lens as described above, the present invention can measure each measurement area by time and minute FI using only one infrared detector, with the infrared detector fixed, and is compact. This will result in the realization of a low-cost scanning type non-contact temperature measuring device.

Furthermore, just before the lens moves to a position where the image of each area to be measured is focused on the infrared detector, a shielding plate is fixed to prevent infrared rays from entering the infrared detector. This makes it possible to measure the temperature of each region using only one drive system.

Furthermore, the effective diameter of the lens in the scanning direction is a, the focal length is f, the effective width of the infrared detector in the scanning direction is w, and the center of all measurements Nwi is the most extreme of the boundaries of each area. By satisfying the condition where θ is the angle between

Furthermore, by using the scanning type non-contact temperature measuring device of the present invention, an air conditioner can detect the position of a human body and measure the temperature of each area in the room, and use the measurement results to perform optimal air conditioning control. can be realized at a low cost without changing the external design.

Example Below, a scanning type non-contact temperature measuring device according to an example of the present invention,
This will be explained with reference to the drawings.

FIG. 1 (al) and FIG. 1 (g) show the configuration of a scanning type non-contact temperature measuring device in a first embodiment of the present invention.

As shown in the figure, a Fresnel lens 2 made of polyethylene is rotated by a motor 3 in front of a pyroelectric sensor 1. In front of the Fresnel lens 2, a polyethylene cover 4 having a slit 5 coated with a paint that blocks infrared rays is provided, and a thermocouple 6 is provided at the lower inside of the cover 4.

FIG. 2 is a diagram for explaining the operation of the scanning non-contact temperature measuring device of the present invention, where a is the effective diameter of the lens 2 in the scanning direction;
f is the focal length of the lens 2, W is the effective width of the pyroelectric sensor 1 in the scanning direction, and θ is the angle between the outermost boundary line of each area and the center of the entire measurement area. Specific numerical examples are shown in Table 1.

(Left below) Table 1 The operation of the scanning non-contact temperature measuring device configured as shown above is explained below using Figures 1(a), 1(b) and 2. explain.

In Figure 1 (with), motor number 3 leads to sensor 1.
The Fresnel lens 2 is rotating and scanning around . At this time, only an infrared image of the area viewed by the Fresnel lens 2 is formed on the sensor 1. In addition, the slit 5 at the boundary of each area is arranged so as to block infrared rays from the measurement area when the lens moves to a position where it overlaps with the slit, as shown in Figure 2. Immediately before the Fresnel lens moves, the sensor 1 detects only the radiation from the slit. As a result, the temperature of the slit measured by the thermocouple 6 and the sensor 1 in each area are determined.
The temperature of each area can be measured from the difference in temperature determined from the output of the . Furthermore, it is possible to detect the position of the human body based on temperature changes in each measured area.As described above, according to this embodiment, a pyroelectric sensor is used as an infrared detector, and a flexible lens is used to form an infrared image on the infrared detector. By installing a full lens, a motor in the drive system that rotates the lens around the infrared detector, a slit formed by coating a fixed cover as a shielding plate with paint that does not transmit infrared rays, and a thermocouple as a contact temperature measuring device, Since only one infrared detector is used, and the infrared detector and shielding plate are fixed, only one drive system is required, and the temperature of each measurement area can be measured in a time-divided manner, making it a compact and low-cost scanning system. This will lead to the realization of a non-contact temperature measuring device.

FIG. 3 shows a configuration in which the scanning type non-contact temperature measuring device of the above embodiment is used in an air conditioner.

As shown in FIG. 3, there is a data forming section 8 that forms temperature data for each region from the signal output from the scanning type non-contact temperature measuring device 7 of the present invention, and from the data obtained from the data forming section 8. The air conditioner main body 11 includes a control signal forming section 9 for forming an air conditioning control signal, and an air conditioning control section 10 for controlling the air blowing force, wind direction, temperature of exhaust air, etc. of the air conditioner, and is controlled from the air outlet 12. Send out air.

As described above, by using the scanning type non-contact temperature measurement device of the above embodiment, the position of the human body can be detected and the temperature of each area in the room can be measured, and the measurement results can be used to perform optimal air conditioning control. It is possible to realize an air conditioner that is small and inexpensive, without deteriorating its appearance.

Effects of the Invention As is clear from the above description of the embodiments, the present invention includes an infrared detector, a lens that forms an infrared image of an object on the infrared detector, and a lens that forms an infrared image of an object on the infrared detector. By installing a drive system that rotates around the frame and a shielding plate that partially blocks infrared rays, each measurement area can be measured in a time-divided manner using only one infrared detector and with the infrared detector fixed. This makes it possible to realize a compact and low-cost scanning type non-contact temperature measuring device.

Furthermore, the lens forms an image of each area where the temperature is to be measured onto the infrared detector! In addition, by using a fixed shielding plate that blocks infrared rays from entering the infrared detector immediately before moving, the temperature of each area can be measured with only one drive system.

Furthermore, the effective diameter of the lens in the scanning direction is a, the focal length is f, the effective width of the infrared detector in the scanning direction is w, and the distance between the outermost boundary line of each area and the center of the entire measurement area is By satisfying the condition when the angle formed is θ,
This means that all question areas can be measured.

Furthermore, by using the scanning type non-contact temperature measuring device of the present invention, an air conditioner can detect the position of a human body and measure the temperature of each area in the room, and use the measurement results to perform optimal air conditioning control. can be realized at low cost. Furthermore, since the scanning non-contact temperature measurement device of the present invention is small and lightweight, it can be easily installed in an unused space within an air conditioner, and there is no need to change the external design of the air conditioner.

[Brief explanation of drawings]

FIG. 1(a) is a perspective view of a scanning type non-contact temperature measuring device according to an embodiment of the present invention, FIG. 1(b) is a partially cutaway perspective view of the same, and FIG. 2 is a perspective view of the same scanning type non-contact temperature measuring device. FIG. 3 is a perspective view of essential parts of an air conditioner using the same scanning type non-contact temperature measuring device, and FIG. 4 is a perspective view of a conventional example. 1... Pyroelectric sensor, 2... Fresnel lens, 3... Motor, 4... Cover,
5...Slit, 6...Thermocouple, 7.
...Scanning type non-contact temperature measuring device, a...
Effective diameter of the lens in the scanning direction, f...Focal length of the lens, W...Effective width of the pyroelectric sensor in the scanning direction, θ...Boundary line of each area The angle between the farthest edge and the center of the entire measurement area. Name of agent: Patent attorney Shigetaka Awano Haka 1 person - ~ Risuv
-, r Fig. 1

Claims (6)

[Claims] (1) An infrared detector, a lens that images infrared rays emitted from an object onto the infrared detector, and a shielding plate placed around the infrared detector that blocks part of the infrared rays, the lens A scanning non-contact temperature measurement device that rotates the infrared detector. (2) The shielding plate that blocks infrared rays blocks infrared rays from entering the infrared detector immediately before the lens moves to a position where the image of each area where the temperature is to be measured is formed on the infrared detector. The scanning type non-contact temperature measuring device according to claim 1. (3) The scanning type non-contact temperature measuring device according to claim 2, wherein the shielding plate for blocking infrared rays does not change its relative position with respect to the infrared detector. (4) The scanning non-contact temperature measuring device according to claim 3, further comprising a contact temperature measuring device for measuring the temperature of a shielding plate that blocks infrared rays. (5) The effective diameter of the lens in the scanning direction is a, the focal length is f, the effective width of the infrared detector in the scanning direction is w, and the outermost boundary line of each area and the center of the entire measurement area are 4. The scanning type non-contact temperature measuring device according to claim 3, which satisfies the following condition, where θ is the angle formed by ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼. (6) An air conditioner using the scanning type non-contact temperature measuring device according to any one of claims 1 to 5.