JP2003149052A - Radiant heat flux measuring apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radiant heat flux measuring apparatus by which a radiant heat flux radiated from a solid, a gas, a liquid and an object composed of a combination of them is detected and measured over a wide wavelength region. SOLUTION: In the radiant heat flux measuring apparatus, an optical lens system through which heat rays in a wide wavelength band are transmitted is arranged so as to face the radiation face of the radiant heat flux radiated from a specimen, a detecting element is arranged in the condensing part of the heat rays transmitted through the lens system, and the radiant heat flux is measured on the basis of an output of the element.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting and measuring the value of radiant heat flux emitted from any object consisting of solids, gas bodies, liquids and combinations thereof by specific contact.

[0002]

2. Description of the Related Art Conventionally, radiant heat is measured by arranging a heat receiving surface having a size of several centimeters square and measuring the temperature change of this heat receiving surface. However, there is a problem that it is troublesome, it takes a long time to measure, it is difficult to determine where the radiation is coming from, and the convective heat is included in the measurement. In addition, there is a radiation thermometer used for temperature measurement, but this uses a limited wavelength band or single wavelength measurement system so that it is convenient for measuring temperature,
It cannot be used for measuring heat flux.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and can easily and quickly determine the heat flux radiated from any object made of solid, gas, liquid and combinations thereof. It is intended to provide an apparatus capable of measuring emissivity without requiring it.

[0004]

[Means for Solving the Problems] [Means for Solving the Problems]
It can be solved by the inventions of ~ 2. That is,

1. An optical lens system for transmitting heat rays in a wide wavelength band is arranged facing a heat radiation surface emitted from an object to be measured, and a detection element is arranged at a condensing portion of the heat rays transmitted through the lens system. Then, the radiant heat flux measuring device is characterized by measuring the radiant heat flux from the output of the element.

2. The radiant heat flux measuring apparatus according to claim 1, wherein the objective lens and the detection element window are made of germanium having no antireflection film as a material of the optical system, and a thermoelectric pyroelectric element is used as a detection system.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The most preferable material for the optical lens system is one that transmits heat rays in all wavelength bands, but germanium is used for the objective lens and the detection element window as an inexpensive material that is industrially available at present. With this optical lens system, about 80% of all the heat rays can be transmitted even at room temperature, and the transmission rate is further increased when the temperature becomes high like a heat generating element supposed as a measured object.

By using the above-mentioned optical lens system and thermoelectric element, it is possible to detect a heat ray having a wavelength of 2 to 22 μm and obtain the heat flux value of the radiant heat ray from the output signal.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. The thermal radiation from the measured radiator 1 passes through the germanium objective lens 2 and then reaches the thermoelectric detection element 4 covered with the germanium window 3. After this signal passes through the amplifier 5 and the rectifier 6, the value is indicated by the indicator 7. Germanium used in the optical system is not intentionally provided with an antireflection film.
This is to flatten the spectral transmission characteristics and obtain a correct heat flux value. In the present embodiment, as shown in the figure, by using the optical chopper 8, the reference radiator 9 and its setting device 10, it is possible to cope with a weak output and drift. Not directly related. This device was prototyped, and the emissivity of the object to be measured was 100 ° C to 600 ° C.
When the heat flux value was measured using the hot surface of No. 3, it was confirmed that the heat radiation value was compatible with the theoretical radiation law with an error of 5% or less, and the heat flux could be measured by the device of the present invention.

[0008]

As described above in detail, the present invention has a feature that the radiant heat flux can be easily measured by using the optical lens system and the detecting element, and contributes to various fields related to the radiant heat measurement. Is.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a heat flux measuring device.

[Explanation of symbols]

1 Radiator to be measured 2 Objective lens 3 Germanium windows 4 detection elements 5 amplifier 6 rectifier 7 Indicator 8 optical chopper 9 Reference radiator 10 Setting device

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hidenobu Matsushita             1-1-17 Chiyo, Hakata-ku, Fukuoka City, Fukuoka Prefecture             Inside Seibu Gas Co., Ltd. F-term (reference) 2G066 AA06 BA01 BA22 BA34 BB07                       BB20

Claims (2)

[Claims] 1. An optical lens system for transmitting heat rays in a wide wavelength band is arranged facing a heat radiation surface emitted from an object to be measured, and a detection element is arranged at a condensing portion of the heat rays transmitted through the lens system. Then, the radiant heat flux measuring device is characterized by measuring the radiant heat flux from the output of the element. 2. The radiant heat flux measuring apparatus according to claim 1, wherein the objective lens and the detection element window are made of germanium having no antireflection film as a material of the optical system, and a thermoelectric pyroelectric element is used as a detection system.