JPS6239735A - Scanning type radiation thermometer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Field of Application] - The present invention relates to a scanning radiation meter that measures the width and temperature of an object to be measured.

[Prior art] Scanning type M scans the width direction of a traveling steel plate, etc., detects radiant energy at each position, and measures the plate width and temperature at each position.
l) 1 densitometer is known.

[Problems to be solved by this invention] However,
With such conventional methods, for example, the inner diameter, outer diameter,
When we wanted to find temperature, etc., we were unable to find it sufficiently.

In view of the above points, an object of the present invention is to provide a scanning radiation thermometer that can determine the outer width, inner width, temperature, etc. of a steel pipe or the like.

[Means for Solving the Problems] The present invention includes a detection unit that scans a measurement target and detects radiant energy at each position, and a detection signal of this detection unit and a predetermined threshold value, and Find the first and second positions that are above the threshold value, and the third and fourth positions that are below the threshold value, and calculate the difference between the first and fourth positions, the second and third positions.
This scanning radiation thermometer is equipped with an arithmetic unit that calculates the outer width and inner width of the measurement object from the difference between the humidity and the position of the measurement object, and calculates the humidity of the measurement object at a position where the humidity is equal to or higher than a threshold value.

[Embodiment] Fig. 1 is an explanatory diagram of a measurement state showing an embodiment of the present invention, Fig. 2 is a diagram of signal waveforms, and Fig. 3 is an explanatory diagram of the configuration.

In FIG. 1, a detection section 2 scans a measurement object 1 such as a red-hot uA tube in the diametrical direction, detects radiant energy at each position along a scanning line, and supplies a detection signal to an interference section 3. These detecting section 2 and focusing section 3 constitute a scanning radiation thermometer.

As shown in FIG. 3, the radiant energy from the measurement object 1 is focused by an optical system such as a lens 21, and is incident on a detection element such as an image sensor 22, corresponding to each position of the measurement object 1. The radiant energy is converted into an electrical signal.

The detection signals of each element of the image sensor 22 are sequentially read out by the drive pulse of the drive circuit 23 and amplified by the amplifier 24, and the drive circuit 23 is driven without providing a position signal to the A-D converter 31 of the processing unit 3. IIL is supplied along with the pulse (pixel corresponding clock), converted to a digital signal, and R△M32
is stored in The processing section 3 includes a processing means 34 such as a microcomputer that operates according to a program in a ROM 33.The processing means 34 performs the following calculations, and the temperature value, inner diameter, and outer diameter signals are sent to a D-A converter. It is converted into an analog signal at 35, and the sample and hold circuit 36.37
．． 38.

The processing means 34 converts the output, which is the brightness signal of the image sensor 22 and stored in the RΔM 32, into a temperature signal.

Next, as shown in FIG. 2, an appropriate predetermined threshold value To
is compared with the detection signal at each position in the scan that can be determined by the pixel corresponding clock, and the detection signal in one scan is determined to be higher than the threshold (direct TO) or higher at the first and second positions (
pixel number) N1. N2, the third which is below the threshold TO;
The fourth positions (pixel numbers) N3 and N4 are determined. Then,
As shown in the following equation, the first and fourth positions N1. The outer diameter (outer width) W'l of the measurement object 1 is determined from the difference in N4, and the inner diameter (inner width) ~2 is determined from the difference between the second and third (vertical positions N2 and N3).

W 1 = A・(N4-N1) ... (1) W
2-, to (N2-1\3)
... (2) Here, A is the measurement distance, lens 2
It is a coefficient determined by the focal length of '1', the size of one pixel of the image sensor 22, etc., and its units are +nm and '1 pixel.

Further, positions N1 to N3 where the detection signal is equal to or higher than the threshold value,
The temperature signal T is obtained at N2 to N4.

FIG. 4 is an explanatory diagram of a measurement state showing another embodiment of the present invention, and FIG. 5 is a signal waveform diagram.

As shown in FIG. 4, when the measurement object 1, such as the gA tube, moves and crosses the scanning line of the detection unit 2, the external shape calculated by calculations (1) and (2) at each time t, Changes in the inside (¥ signals W1 and W2 are as shown in FIG. 5. By determining this maximum of one rotation, the outer shape and inner diameter can be determined.

In addition, in the above example, we explained how to obtain the outer shape, inner diameter, etc. of the steel pipe, but as shown in Fig. 6, the iron-shaped measurement object 1 and other outer widths and inner widths can also be obtained in the same way. can.

In the above example, an image sensor is used as the detection unit, but a rotating mirror or a 1g detection element may be used to scan the measurement object and measure the radiant energy at each position. .

[Effects of the Invention] As described above, the present invention can simultaneously measure the outer width, inner width, and temperature of the object to be measured, and can be applied to various measurements such as #4 pipe.

[Brief explanation of the drawing]

Figures 1, 2, 3, 4, 5, and 6 are
FIG. 1 is an explanatory diagram showing one embodiment of the present invention.

Claims (1)

[Claims] 1. A detection unit that scans the measurement target and detects radiant energy at each position, and a first detection unit that compares the detection signal of this detection unit with a predetermined threshold value and that exceeds the threshold value in one scan. Find the second position, third and fourth positions where the threshold value is below, and calculate the outer width of the measurement object from the difference between the first and fourth positions, and the inner width from the difference between the second and third positions. 1. A scanning radiation thermometer comprising: a calculation section for determining the temperature of the object to be measured at a position where the temperature is equal to or higher than a threshold value.