JPH10281879A - Infrared thermometer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small and inexpensive infrared thermometer for measuring the temperature of an object by receiving infrared rays emitted from the object in which the measuring part of the object can be specified through a very simple structure. SOLUTION: Since a chopper 12 is constructed to pass infrared rays 10 emitted from an object to a piezoelectric element 14 while shielding continually and irradiates an objected with a visible light beam 15a emitted from a light source 15 and reflected on a bend 12b, a measuring part of the object can be irradiates only with the visible light beam 15a emitted from one light source 15 by taking advantage of the continual shielding operation of the chopper 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an infrared thermometer for measuring the temperature of an object by receiving infrared light emitted from the object.

[0002]

2. Description of the Related Art In recent years, infrared thermometers have attracted attention as thermometers that can measure the temperature of an object to be measured without directly touching it.

Conventionally, an infrared thermometer of this type has been known as shown in FIG. That is, FIG.
(A) is a schematic diagram for explaining the operation of a conventional infrared thermometer, and (b) is a conceptual diagram for explaining the operation principle thereof. In the figure, 1 is an infrared thermometer main body, 2 is a sensor unit for detecting infrared rays 4 emitted from the DUT 3, and 5 is a sensor unit 2 for specifying a measurement location of the DUT 3. Visible light emitted. The sensor unit 2 includes two light sources 6 for emitting visible light with excellent straightness, and a thermoelectromotive force sensor 7 for detecting infrared rays 4 emitted from the device under test 3 and generating a signal. It is composed of

With this configuration, first, the DUT 3
The infrared thermometer main body 1 is directed toward the DUT 3 in order to specify the measurement position, and then the switch 1a provided on the infrared thermometer main body 1 is half-pressed to thereby obtain two parallel visible light beams 5. , And finally, the point to be measured is sandwiched between the two visible light rays 5, and when the measuring point has been specified, the switch 1 a is further pushed in to measure the temperature of the object to be measured.

[0005]

However, in the above-mentioned conventional configuration, both ends are irradiated with visible light 5 in order to specify the measurement point of the object to be measured, so that two light sources 6 are always required. In addition, since it is necessary to irradiate the visible light 5 in parallel to both ends, it is necessary to arrange the two light sources 6 with the sensor 7 interposed therebetween, which has a problem in terms of space and cost. .

SUMMARY OF THE INVENTION The present invention has been made to solve this problem, and has as its object to provide a small and inexpensive infrared thermometer capable of specifying a measurement position of an object to be measured with a very simple configuration.

[0007]

In order to solve this problem, an infrared thermometer according to the present invention comprises a chopper means for intermittently blocking infrared light emitted from an object to be measured and causing it to enter a pyroelectric element. It has a configuration to reflect the visible light emitted from the light source and irradiate the object to be measured. This makes it possible to use the intermittent shielding operation of the chopper means, so that the visible light from one light source can be used. Visible light can be applied to the measurement location of the object to be measured, and a small and inexpensive infrared thermometer can be realized.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to a first aspect of the present invention is directed to a pyroelectric element for receiving infrared rays emitted from an object to be measured and outputting a voltage corresponding to the amount of the infrared rays, A chopper means for intermittently emitting infrared light emitted from the light source; and a light source for emitting visible light to the object to be measured. The chopper means intermittently shields infrared light emitted from the object to be measured to produce the focus. And the visible light emitted from the light source is reflected to irradiate the device under test with the intermittent shielding operation of the chopper means. It has an effect that visible light can be applied to a measurement location of an object to be measured with light.

According to a second aspect of the present invention, in the first aspect, the chopper means is constituted by a plate member having one fixed and the other a free end.
Since the free end moves up and down in an arc, the reflected visible light has the effect of scanning up and down the measurement location of the object to be measured.

According to a third aspect of the present invention, in the second aspect, a bent portion is provided on a free end side of the chopper means, and the bent portion reflects visible light from a light source. In addition, the arrangement of the light sources can be changed arbitrarily, which has the effect of increasing the degree of freedom in design.

According to a fourth aspect of the present invention, in the second or third aspect, the chopper means moves the plate member up and down in an arc using a piezoelectric element.
This has the effect that the vertical movement can be controlled with very high accuracy.

According to a fifth aspect of the present invention, in the second or third aspect, the chopper means moves the plate-like member up and down in an arc shape using a solenoid. Has the effect that the vertical movement can be controlled.

An embodiment of the present invention will be described below with reference to FIGS. (Embodiment 1) FIG. 1 is a perspective view of a main part showing a configuration of an infrared thermometer according to an embodiment of the present invention, FIG. 2 is a conceptual diagram for explaining an operation principle of the embodiment, and FIG. FIG. 4 is a schematic diagram for explaining the operation of the embodiment, and FIG. 4 is a conceptual diagram for explaining the operation principle of another embodiment.

In FIG. 1, reference numeral 10 denotes infrared rays emitted from the object to be measured, and 11 denotes infrared rays emitted from the object to be measured.
And an infrared pyroelectric element 12 for detecting a voltage and outputting a voltage corresponding to the amount, and a chopper 12 formed of a substantially L-shaped plate-like member for intermittently shielding the infrared ray 10 to the infrared pyroelectric element 11. , One end of which is fixed to the infrared thermometer body 13,
The other end is a free end, and by applying an AC voltage to the piezoelectric element 14 provided on the upper surface thereof, the free end moves up and down in an arc with the fixed end as an axis. The infrared rays 10 from the object to be measured passing through the window 12a are shielded, and the intermittent infrared rays 10 are incident on the infrared pyroelectric element 11. A bent portion 12b having a mirror surface is provided on the free end side, and is configured to reflect a visible light 15a from a light source 15 composed of a semiconductor laser or an LED to irradiate an object to be measured. Have been.

Next, a description will be given of a method of specifying a measurement location on the device under test with the above configuration. In FIG.
(A) to (c) show the relationship between the movement of the chopper 12 and the accompanying movement of the visible light 15a. When an AC voltage is applied to the piezoelectric element 14, the piezoelectric element 14 undergoes a shape change, and expands and contracts. When the chopper 12 moves up and down in an arcuate manner, and the chopper 12 shifts to the uppermost position, the light source 1
The visible light 15a emitted from the light source 15 reflects the bent portion 12b to irradiate the vicinity of the top of the measurement point, and when the chopper 12 shifts to the lowest position, the visible light 15a emitted from the light source 15 is bent. The portion 12b is reflected to irradiate the vicinity of the lowermost portion of the measurement location.

Therefore, as shown in FIG. 3, when the infrared thermometer main body 13 is directed toward the object to be measured and the switch 13a is half-pressed, the visible light 15a continuously flows between both ends of the measurement location. To irradiate, if the direction of the infrared thermometer body 13 is changed so that the point to be measured is located at the center thereof, the measuring point can be specified. At that time, the switch 13a is further pushed in to determine the desired point. Temperature can be measured.

In this embodiment, the chopper 12 is moved up and down in an arc by using the piezoelectric element 14, but the same effect can be obtained by using a solenoid 16 as shown in FIG. can get.

The position of the light source 15 can be changed by changing the angle of the bent portion 12b.
As a result, the degree of freedom in designing is increased, and the size can be reduced more easily.

[0019]

As is apparent from the above description, according to the present invention, the intermittent shielding operation of the chopper means can be used, and therefore, the measuring point of the object to be measured can be measured with visible light from one light source. Can be irradiated with visible light, and a small and inexpensive infrared thermometer can be realized.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part showing a configuration of an infrared thermometer according to an embodiment of the present invention.

FIG. 2 is a conceptual diagram for explaining the operation principle of the embodiment.

FIG. 3 is a schematic diagram for explaining the operation of the embodiment.

FIG. 4 is a conceptual diagram for explaining the operation principle of another embodiment.

FIG. 5A is a schematic diagram for explaining the operation of a conventional infrared thermometer. FIG. 5B is a conceptual diagram for explaining the operation principle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Infrared thermometer main body 1a Switch 2 Sensor unit 3 DUT 4 Infrared 5 Visible light 6 Light source 7 Sensor 10 Infrared 11 Infrared pyroelectric element 12 Chopper 12a Window 12b Bent part 13 Infrared thermometer main body 13a Switch 14 Piezoelectric element 15 Light source 15a Visible light 16 solenoid

Claims (5)

[Claims] 1. A pyroelectric element for receiving infrared light emitted from an object to be measured and outputting a voltage corresponding to the amount of the infrared light, chopper means for interrupting the infrared light emitted from the object to be measured, and an object to be measured And a light source for emitting visible light to the light source.The chopper means intermittently shields infrared light emitted from the object to be measured and causes the infrared light to enter the pyroelectric element, and simultaneously emits visible light emitted from the light source. An infrared thermometer for reflecting light to irradiate the object to be measured. 2. The infrared thermometer according to claim 1, wherein one of the chopper means is fixed and the other is a plate member having a free end. 3. The infrared thermometer according to claim 2, wherein a bent portion is provided on a free end side of the chopper means, and the bent portion reflects visible light from a light source. 4. The infrared thermometer according to claim 2, wherein the chopper means moves the plate member up and down in an arc using a piezoelectric element. 5. The apparatus according to claim 2, wherein the chopper means moves the plate member up and down in an arc shape using a solenoid.
Or the infrared thermometer according to 3.