JPH04134037U - radiation thermometer - Google Patents

Abstract

(57) [Summary] (with amendments) [Purpose] To provide a radiation thermometer that consumes less power and generates less heat, has fewer adjustment points, and is easy to use. [Structure] In a radiation thermometer that collects infrared rays emitted from a measurement object 2 with a condenser lens 3 and makes them incident on an infrared detector 1, the temperature of the measurement object is measured based on the amount of incident infrared rays. A light source 7 that emits visible light 8 is provided on one outer side in the diametrical direction of the optical lens 3, and a condenser lens 3 is provided to emit the visible light 8 in front of the light source 7 in the irradiation direction and on the outer side. A beam splitter 10 is provided which splits the light beam into a light beam that travels along the optical axis 5 direction and a light beam that travels in a direction perpendicular to the optical axis 5 direction. A reflector 14 is provided that reflects light rays traveling in a direction perpendicular to the optical axis 5 in a direction along the optical axis 5.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention uses a condensing lens to collect infrared rays emitted from the object to be measured. The temperature of the target is measured based on the amount of infrared rays incident on it. Regarding radiation thermometers.

0002

[Conventional technology]

The radiation thermometer is used in various fields, and its measurement mode is also based on radiation temperature. Not only when the meter and the object to be measured are stationary and the distance between them is fixed; If either or both of the radiation thermometer and the measurement target move, the distance changes. In some cases, this may occur. In addition, in recent years, miniaturization has been promoted, and so-called handy type of radiation thermometer has been put into practical use, and the objects of measurement have expanded from static to dynamic objects. It's coming. In this way, at least one of the radiation thermometer and the measurement target When measuring the temperature of an object under dynamic conditions, the measurement area must always be clearly defined. It is important to hold on to it.

0003 As a radiation thermometer that meets these needs, for example, Japanese Patent Publication No. 62-12848 There are some things shown below. Figure 5 schematically shows the radiation thermometer disclosed in this publication. In this figure, 51 is the infrared ray that measures the infrared ray 53 emitted from the measurement object 52. A detector housed in a case 54. 55 is provided on the front periphery of case 54 It is a collimator. 56 is the actual infrared radiation area 57 on the surface of the measurement target 52 Multiple visible light sources each emit visible light rays 58 that reveal the outer circumferential position. A collimating lens (not shown) is provided in front of each in the shooting direction.

0004 According to the radiation thermometer configured in this way, the radiation thermometer emitted from multiple visible light sources56 A plurality of visible light rays 57 are adjusted by a collimating lens and irradiated onto a measurement target 52. This allows you to clearly understand the measurement area that is the target of temperature measurement. Ru.

[0005]

[Problem that the idea aims to solve]

However, in the conventional radiation thermometer described above, multiple visible light sources56 and collimators are used. In addition to complicating the configuration, power consumption due to the visible light source55 In addition to being uneconomical due to the large amount of heat generated by the There was a problem that there were a lot of adjustments.

[0006] This invention was made with the above-mentioned considerations in mind, and its purpose is to: Easy-to-use radiant temperature with low power consumption and heat generation, and fewer adjustment points The objective is to provide a measurement system.

[0007]

[Means to solve the problem]

In order to achieve the above purpose, the present invention uses infrared rays emitted from the measurement target. is collected by a condensing lens and made to enter an infrared detector, and the amount of infrared rays incident on it is In a radiation thermometer that measures the temperature of a measurement target based on the diameter of the condensing lens A light source that emits visible light is provided on the outside of one of the directions, and the method of irradiating this light source is The visible light is directed forward and to the outside, and the one outside is directed toward the optical axis of the condensing lens. A beam that is divided into a light ray that travels along the optical axis direction and a light ray that travels in a direction perpendicular to the optical axis direction. a beam splitter is provided, and further outside the other diametrical direction of the condensing lens, Reflecting a light ray traveling in a direction perpendicular to the optical axis direction in a direction along the optical axis direction. A reflector is provided.

[0008]

[Effect]

In the above radiation thermometer, visible light emitted from the light source is split into a beam splitter. At the center, a part of it extends along the optical axis of the condenser lens. It becomes a ray of light that travels towards the object to be measured. The remaining rays are perpendicular to the optical axis direction. The direction of the optical axis is reflected by a reflector on the other outside of the condensing lens. After being reflected in the direction along the direction, it heads toward the measurement target. Therefore, for these two rays Therefore, the measurement area of the measurement target is clarified.

[0009]

【Example】

Embodiments of the present invention will be described below based on the drawings.

0010 FIG. 1 schematically shows a radiation thermometer according to an embodiment of the present invention. In this case, 1 uses, for example, a thermopile installed to face the measurement target 2. An infrared detector 3 is provided in front of the infrared incident surface 4 of the infrared detector 1. It is an infrared-transmissive condensing lens, and the infrared incident surface 4 is located at one focal point. It is set as. In addition, 5 is the optical axis of the condensing lens 3, and 6 is the optical axis condensed by the condensing lens 3. This shows the infrared rays that can be emitted.

[0011] 7 is provided below the condenser lens 3 in the diametrical direction, and directs the visible light 8 at right angles to the optical axis 5. This light source 7 emits visible light with as little spread as possible. Preferably, it emits a line 8, for example consisting of a laser diode. 9 is this light A condensing system installed in front of the source 7 in the irradiation direction, such as a collimator using an infrared lens. It's Torrens.

0012 10 directs the visible light 8 emitted from the light source 7 and passed through the collimating lens 9 to each other. Two intersecting directions, that is, a direction parallel to the optical axis 5 and toward the measurement object 2; , a beam splitter that splits the beam into a direction perpendicular to the optical axis 5, such as a half mirror. The incident surface is located below the condenser lens 3 in the diametrical direction, and the incident surface It is placed at 45° with the direction. Therefore, the amount of light incident on this half mirror 10 is A part of the visible light 8 is reflected, as shown by reference numeral 11, parallel to the optical axis 3 and above. The lower outer edge of the infrared light 6 (which is parallel to the optical axis 5) 12 (in the illustrated example the lower outer edge) ) in the two directions of the measurement target, and the remaining part passes through the half mirror 10 as it is. , as indicated by reference numeral 13, in a direction perpendicular to the optical axis 5.

[0013] 14 directs the light ray 13 traveling in a direction perpendicular to the optical axis 5 to a point parallel to the optical axis 5 and the object to be measured. A reflector that reflects in the direction toward 2, for example, made of a mirror, which is directly connected to the condensing lens 3. It is installed radially upward at a 45° angle. Therefore, in this mirror 14 The emitted light ray 13 is parallel to the optical axis 5 and above the infrared ray 6, as shown by reference numeral 15. The outer edge (which is parallel to the optical axis 5) 16 (lower in the example shown) is the two sides of the measurement target. Go towards the direction.

[0014] In the radiation thermometer configured as above, visible light emitted from the light source 7 Line 8 is a half mirror 10 that partially focuses light on the outer side below the condenser lens 3. It becomes a light ray 11 that travels along the optical axis 5 direction of the lens 3 and heads toward the measurement object 2. and , the remaining light rays travel in a direction perpendicular to the direction of the light source 7, as shown by reference numeral 13, and are concentrated. On the outside above the optical lens 3, the mirror 14 is used to reflect the direction along the optical axis 5. After being irradiated, it heads toward the object to be measured 2, as shown by reference numeral 15.

[0015] The light rays 11 and 15 are parallel to each other and parallel to the optical axis 5, and the surface of the measurement object 2 is As shown in FIG. 2, irradiation is performed in spots. In this FIG. 2, 17 and 18 are the above-mentioned It shows the spots where the rays 11 and 15 illuminated the surface of the measurement object 2, and these spots 17 , 18 are formed above and below the measurement area 19 of the measurement object 2, and therefore these Pots 17, 18 clearly indicate the measurement area 19.

[0016] The present invention is not limited to the above-mentioned embodiments, and may be implemented with various modifications. I can do that. For example, in FIG. Directly toward the measurement object 2 below the condenser lens 3 so as to be parallel to the axis 5. It is set up as follows. There is no difference in other configurations from that shown in Figure 1. stomach.

[0017] In this embodiment, the visible light 8 emitted from the light source 7 is transmitted through the half mirror 10. , the light ray 20 is parallel to the optical axis 5 and the ray 21 traveling perpendicular to the optical axis 5. After being reflected in the direction along the optical axis 5 by the mirror 14, this light ray 21 is , as indicated by reference numeral 22, toward the measurement object 2. Therefore, also in this example, The measurement area 19 in the measurement object 2 is clearly indicated.

[0018] Further, the embodiment shown in FIG. 4 has the light source 7, collimating lens 9, Adjust the optical axis so that the half mirror 10 and the mirror 14 are located behind the infrared detector 1. The operation of this embodiment is shifted in five directions, and a description of the operation of this embodiment will be omitted.

[0019] Then, instead of the collimating lens 9, a Cassegrain reflector is used to condense the light. A prism may be used instead of the half mirror 10. Furthermore, a half mirror, a prism, or the like may be used instead of the mirror 14. and Also, as the infrared detector 1, a solid state detector other than the above thermopile may be used. Good too.

[0020] Note that two beam splitters 10 and one reflector 14 are added to the configuration of the above embodiment. By adding, spots 22 and 23 shown by imaginary lines in FIG. 2 are also formed. be able to.

[0021]

[Effect of the idea]

As explained above, according to the present invention, only one light source that emits visible light is provided, By appropriately dividing and reflecting the visible light emitted from this light source, the measurement field of view is 2 or 4 visible light rays along the line can be obtained and measurements can be made by these rays. The measurement area on the target can be clearly confirmed.

[0022] In addition, since there is only one light source in this invention, power consumption and heat generation are reduced. In addition, it is easy to handle because there are few adjustment points, and it is small and compact. Can be configured into pacts. Especially when applied to portable or long-distance types. Greater effects can be expected.

[Brief explanation of drawings]

FIG. 1 is a diagram schematically showing the configuration of a radiation thermometer according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining the operation of the radiation thermometer.

FIG. 3 is a diagram schematically showing the configuration of a radiation thermometer according to another embodiment of the present invention.

FIG. 4 is a diagram schematically showing the configuration of a radiation thermometer according to still another embodiment of the present invention.

FIG. 5 is a diagram schematically showing the configuration of a conventional radiation thermometer.

[Explanation of symbols]

1...Infrared detector, 2...Measurement object, 3...Condensing lens, 5
…Optical axis, 7…Light source, 8…Visible light, 10…Beam splitter, 14…Reflector.

Claims (1)

[Scope of utility model registration request] 1. A radiation thermometer that collects infrared rays emitted from a measurement object using a condensing lens and makes the collected infrared rays enter an infrared detector, and measures the temperature of the measurement object based on the amount of incident infrared rays. A light source that emits visible light is provided on one outside in the diametrical direction of the lens, and the visible light is emitted forward in the irradiation direction of the light source and on the outside along the optical axis direction of the condensing lens. A beam splitter is provided to split the light beam into a light beam that travels and a light beam that travels in a direction perpendicular to the optical axis direction, and further, a beam splitter that splits the light beam into a light beam that travels in a direction perpendicular to the optical axis direction, and a light beam that travels in a direction perpendicular to the optical axis direction is provided on the other outside of the condenser lens in the diametrical direction. A radiation thermometer comprising a reflector that reflects the light in a direction along the optical axis direction.