JPS5983020A - Temperature measuring device - Google Patents

Abstract

PURPOSE:To make it possible to measure accurate temperature all the time, by providing a thermometer at a part of a measuring pipe, which is protruded in the measuring direction, and performing correction so that the output of a radiation thermometer, wherein an image sensor and the like are used, is made to agree with the output of the thermometer. CONSTITUTION:The following devices are provided: a furnace wall 1 of a heating furnace; a body to be measured 2; a mesuring pipe 3, which has an opening part ptotruded in the measuring direction from the furnace wall 1 in order to alleviate the effect of the radiation energy from the furnace wall; a thermocouple 4 as a thermometer, which is provided on a body whose emissivity is known or cavity part 3a as a reference temperature part that is formed at one end of the measuring pipe 3; a radiation thermometer 5, which is provided at the other end of the measuring pipe 3; and a condenser lens 6. Then a measuring device is constituted by an image sensor 7 as a detecting element, into which radiation energy from the lens 6 is inputted; and an operating circuit 8 such as a microcomputer, to which the output of the image sensor 7 and the output of the thermocouple 4 are inputted, and which performs the control of the image sensor 7 and the specified operating process.

Description

[Detailed description of the invention] (υ Field of invention This invention is an image sensor like COD.

The present invention also relates to a temperature measuring device using a radiation thermometer having a detection element.

(2) Conventional technology Image sensors such as COD, detection elements are subject to temperature changes,
Drift tra occurs due to changes over time, and it is necessary to eliminate this effect.

For this reason, it is necessary to carry out warm-temperature correction using a blackbody furnace or the like, but this cannot always be done and requires a great deal of time and effort for calibration.

(3) Purpose of the Invention The purpose of the present invention is to provide a self-calibrating temperature measuring device that can measure 9 or more points and easily (y-correct).

(4) Embodiment of the Invention FIG. 1 is an explanatory diagram showing an embodiment of the invention.

In the figure, 1 is the furnace wall of the heating furnace, and 2 is the object to be measured.

3 is a measuring tube with an opening protruding from the furnace wall 1 in the measuring direction to reduce the shadow of radiant energy from the furnace wall 1, and 4 is a reference temperature section formed at one end of the measuring tube 3. A thermocouple as a thermometer is installed in an object with a known emissivity or in a cavity 3a. 5 is a radiation thermometer installed at the other end of the measurement tube 3, and a lens 6 for condensing the measurement light, An image sensor 7 as a detection element into which radiant energy is incident, the output of the image sensor 7, and the output of the thermocouple 4 are inputted, and the image sensor 7 is controlled and a predetermined calculation process is performed. The arithmetic circuit 8 has a p configuration. Note that the arithmetic circuit 8 may be configured separately from the radiation thermometer 5.

The image sensor 7 receives radiant energy from the measuring object 2 and one end of the measuring tube 3, converts it into an electrical signal, and inputs output signals from various parts as shown in FIG. 2 to the arithmetic circuit 8.

The arithmetic circuit 8 corrects the output T2 of one end of the measuring tube 3 of the image sensor 7 to match the temperature signal output of the thermocouple 4, corrects the overall output T1 of the image sensor 7, and constantly outputs the radiation thermometer 5. is being calibrated.

Note that the cavity s3a at one end of the measurement tube 3, which emits radiation and has a uniform temperature, has a U-shaped cross section as shown in FIG. Various types of measurement L (measurement L) can be considered, and thermocouples 41 and 42 may be used at two or more locations on the measurement tube 3, as shown in FIG. (5 may be used as a hollow portion if necessary), calibration becomes even easier.By constantly performing automatic calibration in this way, correct temperature measurement is always possible.

Incidentally, as shown in FIG. 5, the measuring tube 3 and the measuring object 2 may be repeatedly run over a hill using a rotating mirror M1 to cause the radiant energy to be incident on the radiation thermometer 5, or,
As shown in FIG. 6, a flat mirror M2 may be prepared and tilted only during one calibration so that the radiant energy from the measuring tube 3 is incident on the radiation thermometer.

(5) Summary of the Invention As described above, this invention provides a thermometer in a part of a measuring tube protruding in the measurement direction, and uses a radiation thermometer using an image sensor etc. to detect the object to be measured and a part of the measuring tube. This is a temperature measurement device that uses a calculation circuit to correct the output of the radiation thermometer so that the output corresponding to a part of the radiation thermometer measurement tube matches the output of the thermometer.

(6) Effect of invention With a simple configuration of installing a thermometer in the measuring tube.

Since the radiation thermometer can be calibrated at any time, it can be made into a self-calibration type radiation thermometer, and accurate 1M degree measurement can be performed at all times. Further, by providing a reference temperature section in a part of the measuring tube and making measurements, the calibration can be made even more precise. FIG. 2 is a diagram illustrating the configuration of an embodiment of the present invention, and FIG. 2 is a signal waveform diagram for explaining the operation.

1... Furnace wall, 2... Measuring object, 3... Measuring tube, 4
... Thermocouple as a thermometer, 5 ... Radiation thermometer, 6
...Lens, 7...Image sensor, 8...Arithmetic circuit +3a...Cavity as reference temperature section Patent applicant Chino Seisakusho Co., Ltd. 91

Claims (1)

[Claims] 1. A measuring tube having an opening protruding in the measuring direction. A thermometer installed in a part of this measuring tube, a radiation thermometer that receives radiant energy from a part of this measuring tube and a measuring object, and an output of a part of the measuring tube of this radiation thermometer is 1. A temperature measuring device comprising: an arithmetic circuit that corrects the output of the radiation temperature analyzer so that it matches the output of the meter. 2. The temperature measuring device according to claim 1, wherein a reference temperature section is formed in a part of the measuring tube. 3. The temperature measuring device according to claim 1 or 2, characterized in that an image sensor is used as the radiation thermometer.