JPH02272332A - Radiation thermometer - Google Patents

Abstract

PURPOSE:To measure a temperature of the inner part of a curved duct by including a low temperature area, as well with high accuracy by using a flexible pipe whose inside surface is a specular surface as a condensing means. CONSTITUTION:A condensing pipe 2 which has the inside specular surface and made of a material abounding in flexibility such as vinyl chloride, etc., is deformed to match a shape of a curved auditory meatus 1 and inserted into the auditory meatus, and led to an infrared sensor 4 for converting infrared rays radiated from the tympanum 1a to an electric signal. Outputs of the infrared sensor 4 and a temperature sensor 5 are amplified by amplifiers 6a, 6b and inputted to an A/D converter 7. The A/D converter 7 converts the outputs of the amplifiers 6a, 6b to digital values and inputs them to a microcomputer 8. The microcomputer 8 calculates a temperature of the tympanum 1a from the outputs of the infrared sensor 4 and the temperature sensor 5. Also, a specular surface layer 3 is formed on the inside surface of a body 3a, and constituted of a gold vapor-deposited layer 3b and a medium metallic vapor-deposited layer 3c.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a radiation thermometer that measures the temperature of an object from infrared radiation emitted from the object.

[Conventional technology]

A radiation thermometer that measures the temperature of an object using an infrared sensor 4 from infrared radiation emitted from the measurement object 1 is widely known as a method of non-contact temperature measurement. The infrared rays of these radiation thermometers are collected using a metal condensing pipe 2' as shown in Fig. 4, an optical lens 60 combined with the concentrating pipe 2' as shown in Fig. 5, or an optical fiber. is used.

[Problem to be solved by the invention]

However, when an optical lens or metal pipe is used to collect light, the angle of the infrared light that can be collected is fixed, making it impossible to measure the temperature at the back of a curved pipe, for example. Furthermore, when using an optical fiber, it is possible to focus light from deep within the conduit, but the transmission loss of the optical fiber makes it difficult to measure low-temperature regions.

SUMMARY OF THE INVENTION An object of the present invention is to provide a radiation thermometer that can measure the temperature deep inside a bent pipe with high precision, including in low-temperature regions.

[Means to solve the problem]

In order to achieve the above object, the present invention has the following configuration. That is, (l) a condensing means for concentrating infrared radiation from a measurement object, an infrared sensor for converting infrared radiant energy into an electrical signal, and a temperature sensor for measuring the temperature of the infrared sensor and its surroundings. and an infrared amplifier that amplifies the electrical signal of the infrared sensor.
a temperature-sensitive amplifier that amplifies the electrical signal of the temperature-sensitive sensor;
In the radiation thermometer equipped with an arithmetic unit that calculates temperature data from the signal from the amplifier, the light collecting means is constructed of a flexible pipe whose inner surface is mirror-finished.

Alternatively, the pipe is constructed of a plurality of flexible pipes each having a mirror surface.

[Effect]

According to the above configuration, it is possible to measure the depths of recesses and curved pipes in the following manner. In other words, since the light condensing means is composed of a flexible pipe, even if the measurement site is deep inside a curved conduit, the condensing pipe can be inserted into the conduit with the shape of the condensing pipe shaped to follow the conduit. This makes it possible. Furthermore, by making the inner surface of the condensing pipe a mirror surface, the infrared rays from the measurement site are repeatedly reflected at a high reflectance within the pipe, and are efficiently focused on the infrared sensor.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a radiation thermometer for measuring the eardrum source of a living body using the present invention will be described below with reference to the drawings.

FIG. 1 is a basic configuration block diagram of a radiation thermometer. 1st
In the figure, 1 is the auditory canal in the head of a living body, and 1a is the eardrum that is the object to be measured. 2 is a flexible condensing pipe (hereinafter abbreviated as condensing pipe) having a mirror-surfaced inner surface, which deforms to match the shape of the bent auditory canal 1, is inserted into the auditory canal 1, and is inserted into the eardrum 1a.
An infrared sensor 4, which will be described later, focuses the emitted infrared rays.
lead to.

The light collecting pipe 2 is made of a highly flexible material such as vinyl chloride.

4 is an infrared sensor that converts incident infrared energy into an electrical signal. 5 is an infrared sensor and a temperature sensor that detects the temperature around the infrared sensor. Amplifiers 6a and 6b amplify the output of the infrared sensor and the output of the temperature sensor. 7 is A
/D converter, and the outputs of the amplifiers 6a and 6b are converted into digital values and input to the microcomputer 8.
It is displayed on the display 9.

The microcomputer 8 calculates the temperature of the eardrum 1a from the output of the infrared sensor 4 and the output of the temperature sensor 5. FIG. 2 shows a cross-sectional view of a five-sided light condensing pipe 2 whose inner surface is a mirror surface.

The mirror layer 6 is formed on the inner surface of the flexible pipe body 3a,
It is composed of a gold vapor deposition layer 6b for increasing the reflection efficiency of infrared rays and a mediating metal vapor deposition layer 6C for stably bonding gold particles to the flexible pipe body 3a.

FIG. 3 is a configuration diagram of a condensing pipe 20 in a second embodiment of the present invention. In this example, the condensing pipe 20 is further subdivided into several highly flexible thin pipes 20a to 20n to further improve the overall flexibility. This increases the efficiency of light collection.

The inner surface of each of the pipes 20a to 20n has the same structure as shown in FIG.

〔Effect of the invention〕

According to the present invention, even if the eardrum is located deep in the curved auditory canal, the condensing pipe itself is flexible and can be adapted to individual shapes. Furthermore, since the inner surface of the pipe is mirror-finished with gold plating, etc., the emissivity of infrared rays is extremely high regardless of the wavelength, making it possible to measure from low temperatures.

[Brief explanation of drawings]

FIG. 1 is a basic configuration block diagram of a radiation thermometer according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view of a condensing pipe in the first embodiment, and FIG. 3 is a configuration of a condensing pipe in a second embodiment. 4 and 5 are cross-sectional views of a condensing pipe of a conventional radiation thermometer. 1... Auditory canal, 1a... Eardrum, 2.20... Light collection pipe, 6... Specular layer, 4... Red External sensor, 5...Temperature sensor, 7...A/D converter,

Claims (1)

[Claims] (l) A condensing means for concentrating infrared radiation from a measurement object, an infrared sensor for converting the infrared radiation energy into an electrical signal, and an infrared sensor for controlling the temperature of the infrared sensor and its surroundings. A temperature-sensitive sensor to be measured, an infrared amplifier that amplifies the electrical signal of the infrared sensor, a temperature-sensitive amplifier that amplifies the electrical signal of the temperature-sensitive sensor, and an operation that calculates temperature data from the signals from the two amplifiers. 1. A radiation thermometer comprising: a radiation thermometer, characterized in that the light condensing means is constituted by a flexible pipe whose inner surface is a mirror surface. (2) The radiation thermometer according to claim 1, wherein the pipe is a flexible pipe having a plurality of mirror surfaces.