JPH1048053A - Scanning radiation thermometer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scanning radiation thermometer to allow a wider measurement range, real time processing and sufficiently precise measurement even under vibration and temperature changes. SOLUTION: A scanning radiation thermometer has a detector 3 to receive radiation energy from a material 12 to be measured, a scanning time controller 10 for the detector 3, a diaphragm 2 provided on the front face of the detector 3, a diaphragm adjuster 11 to adjust the opening of the diaphragm 2, a memory 7 to record a change in relationship between the output and the temperature of the detector 3 when a scanning time and the opening are changed, a central processing unit 6 to select the proper scanning time and the proper opening of the diaphragm 2 in accordance with data in the memory 7 from actually obtained detection output, set the scanning time and the opening of the diaphragm 2 to be proper values while operating the scanning time controller 10 and the diaphragm adjuster 11 and fix the temperature of the material to be measured 12 from the output of the detector 3, and a temperature display device 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scanning radiation thermometer having a wide measuring temperature range.

[0002]

2. Description of the Related Art A radiation thermometer receives radiation emitted from an object to be measured by a detector using an element such as silicon, and measures the relation between the output of the detector based on the received energy and the temperature of the object. The result is displayed. By the way, even when the received light energy is 0, the detector shows a small output called a dark output, and when the received light energy becomes excessive, the output is saturated. Therefore, the measurement temperature range is limited to the range from the dark output level of the detector to the saturation output level.

In a conventional scanning radiation thermometer, the light receiving time is changed by changing the scanning time of a detector in which light receiving elements are arranged in an array, and the measuring temperature range is expanded by adjusting the light receiving energy. That is, when the scanning time is shortened, the light receiving time in one scan is shortened. As a result, even when strong radiation energy is received, the output of the detector is hardly saturated,
Higher temperature measurements are possible. Conversely, if the scanning time is lengthened, the light receiving time in one scan is lengthened, and even when weak radiation energy is received, a sufficient output exceeding the dark output is obtained, and measurement at a lower temperature becomes possible.

Utilizing this characteristic, in a conventional scanning radiation thermometer, the scanning time of the detector is set at several stages, and the relationship between the output of the detector and the temperature is set for each set scanning time. Is recorded. At the time of measurement, an appropriate scanning time according to the temperature to be measured is selected, and the temperature is obtained from the linearized data corresponding to the scanning time. As described above, by setting the scanning time of the detector to an appropriate value according to the temperature to be measured, it is possible to measure the temperature of a wide area.

[0005]

However, in the conventional scanning radiation thermometer, there is a limit in the variable range of the scanning time, so that the measurable range when the same detecting element is used is sufficiently expanded. Could not. If the scanning time is shortened for higher temperature measurement, it is necessary to increase the data processing speed, and real-time processing becomes difficult. In addition, if the scanning time is increased to perform measurement at a lower temperature, accurate measurement becomes difficult due to the influence of vibration or temperature change depending on the measurement target.

Therefore, conventionally, for example, a thermometer capable of measuring from 500 ° C. to 800 ° C.,
This problem has been dealt with by using a plurality of thermometers such as those capable of measuring up to 00 ° C. The present invention provides a thermometer capable of expanding the measurement range of the same thermometer in a scanning radiation thermometer, performing real-time processing, and measuring with sufficient accuracy even when there is vibration or temperature change. The purpose is to:

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a detector for receiving radiant energy from an object to be measured, a scanning time adjuster for the detector, and an aperture provided in front of the detector. A diaphragm adjuster for adjusting the opening of the diaphragm, a memory for recording a change in the relationship between the output of the detector and the temperature when the scanning time and the opening are changed, and a detection output actually obtained. From the above, while selecting an appropriate scanning time and aperture opening based on the data of the memory, operating the scanning time adjuster and the aperture adjuster to set the scanning time and aperture opening to the appropriate value, A scanning radiation thermometer comprising a central processing unit for determining a temperature of an object to be measured from an output of a detector, and a display device for the temperature.

[0008]

FIG. 1 shows a scanning radiation thermometer according to the present invention.
An example will be described with reference to FIG. Detector 3 receiving radiant energy from measurement object 12, and output of detector 3 is amplifier 4
And a central processing unit 6, a memory 7, and a measured temperature display 8 which are input via an A / D converter 5, and a detector 3
A lens 1 and an aperture 2 are provided on the front surface of the aperture, an aperture adjuster 11 for adjusting the aperture of the aperture is provided on the aperture 2, and a scanning time adjuster 10 is provided on the detector 3 respectively.

The memory 7 records the change in the relationship between the output of the detector 3 and the temperature when the opening of the diaphragm 2 and the scanning time of the detector 3 are changed. The central processing unit 6
From the actually obtained output of the detector 3, an appropriate scanning time and aperture opening are selected based on the data in the memory 7, and the scanning time adjuster 10 and the aperture adjuster 11 are operated to detect the detector 3. Has the function of adjusting the scanning time and the opening of the diaphragm 2 to appropriate values, determining the temperature of the measuring object 12 from the output of the detector 3 after the adjustment, and outputting the temperature to the display device 8.

The output of the detector 3 is amplified by an amplifier 4,
The signal is converted into a digital signal by the A / D converter 5 and input to the central processing unit 6. The central processing unit 6 selects an appropriate value of the opening degree of the aperture 2 and the scanning time of the selector 3 according to the output of the detector 3. At the time of selection, linearized data previously input to the memory 7 is used. Then, the iris adjuster 11 and the scan time adjuster 10 are operated to adjust the iris 2 and the scan time, determine the temperature of the object to be measured from the output of the detector 3, and output it to the display device 8.

FIG. 2 shows an example of linearized data input to the memory 7. When the temperature of the measurement object increases, the output of the detector 3 increases, and a parabolic temperature-output curve as shown in the figure is obtained. This curve shifts to the high temperature side when the scanning time is shortened for the same aperture, and shifts to the high temperature side when the aperture value is increased during the same scanning time, that is, when the opening of the aperture 2 is narrowed. By adjusting both the degree of opening of the diaphragm 2 and the scanning time of the detector 3 with reference to such linearized data, it is possible to measure a wider temperature of the object to be measured. According to the data of FIG.
From 1500 ° C. to 1500 ° C. or higher.

In the thermometer of the present invention, the aperture 2 and the aperture adjuster 11 can be those for a normal camera, and the scanning time adjuster 10 of the detector 3 is used for the light receiving time of the detector 3. May be adjusted, and the detector 3
And a clock generation circuit that supplies a scan synchronizing signal to the clock signal. Further, as the display device 8, a CRT, a printer, or the like can be employed. It should be noted that an input device 9 such as a keyboard may be attached to the central processing unit 6 to input the aperture or the scanning time in advance, for example, when the approximate temperature of the measurement target can be predicted.

[0013]

EXAMPLE The surface temperature of a steel material was measured with a scanning radiation thermometer of the present invention having the structure shown in FIG. For the memory 7, a black body furnace is used, and the aperture value is set to 3.5, 5.6, 8,
16 levels, scanning time of detector 3 is 7ms, 10ms, 2
Data as shown in FIG. 2 in which outputs were measured at four levels of 0 ms and 30 ms were input as linearized data.

The results of measurement by the scanning radiation thermometer of the present invention were compared with the results of measurement by a thermocouple.
Accurate values consistent with both were obtained over a temperature range of １1500 ° C. Also, in this temperature range, accurate measurement results were obtained even when the temperature change was severe.

[0015]

According to the scanning radiation thermometer of the present invention, when measuring a high-temperature object, the amount of light received by the detector is reduced by reducing the aperture of the aperture, and saturation of the output of the detector is avoided. , And can be measured in an appropriate scanning time according to the data processing speed. Also, when measuring low-temperature objects, increasing the aperture of the aperture increases the amount of light received by the detector, avoids a decrease in detector output, and sets an appropriate scanning time in consideration of vibration and temperature changes of the object. Can be measured. Therefore, even if the measurement temperature is wide, it can be measured with the same thermometer, the range can be expanded to about 600 ° C. to 1500 ° C., real-time processing is possible, and sufficient even if there is vibration or temperature change. Can be measured with accuracy.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of a thermometer of the present invention.

FIG. 2 is a graph showing data of a memory in the thermometer of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Lens 2 ... Aperture 3 ... Detector 4 ... Amplifier 5 ... A / D converter 6 ... Central processing unit 7 ... Memory 8 ... Display device 9 ... Input device 10 ... Scanning time adjuster 11 ... Aperture adjuster 12 ... Measurement Object

Claims (1)

[Claims] 1. A detector for receiving radiant energy from an object to be measured, a scanning time adjuster for the detector, an aperture provided on a front surface of the detector, an aperture adjuster for adjusting an opening of the aperture, and the scanning. A memory for recording a change in the relationship between the output of the detector and the temperature when the time and the opening degree are changed, and an appropriate scanning time and opening of the aperture based on data of the memory from a detection output actually obtained. Central processing for setting the scanning time adjuster and the aperture adjuster to set the scanning time and the aperture of the aperture to the appropriate values, and for determining the temperature of the object to be measured from the output of the detector, while selecting the degree. A scanning radiation thermometer comprising a device and a display device for the temperature.