JPH0432378A - Infrared ray image pickup device - Google Patents

Abstract

PURPOSE:To obtain an infrared ray video with fidelity by providing a 2nd reference heat source provided to the outside of a visual field of an object in other scanning line direction and a means receiving an output of an infrared ray sensor and correcting and outputting an output signal of each sensor based on signals of 1st and 2nd reference heat sources in the output. CONSTITUTION:A 1st reference heat source la and a 2nd reference heat source 1b with a different prescribed temperature are provided to both outsides in the scanning direction of a visual field 2alpha of a scanning mirror 2. When an object 1 is picked up, the scanning mirror 2 is reciprocated around the axis to scan the 1st and 2nd reference heat sources 1a, 1b. Then each infrared ray sensor 3 receives a reflecting light from the scanning mirror 2 and outputs a signal for each scanning. The signal is fed to a correction device 5 via an A/D converter 4 and the correction device 5 corrects the signal based on a reference signal corresponding to a prescribed setting temperature and sends the result to a picture processing unit. Thus, the characteristic dispersion of each sensor is corrected and a video with fidelity is obtained.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a temperature compensated infrared imaging device.

[Conventional technology]

In an imaging device in which a plurality of infrared sensors 3 are arranged in a straight line as shown in FIG. Since it is not possible to obtain a clear image, the changes in the signal obtained by scanning are displayed.

[Problem to be solved by the invention]

In the above-mentioned conventional infrared imaging device in which a plurality of infrared sensors are arranged in a straight line, the output level will not be the same even if objects of the same temperature are photographed due to differences in the output characteristics and time change characteristics of the individual sensors.

For this reason, if the output signal is used as an image as it is, Figure 3 (b
) horizontal stripes occur in the scanning direction. For this reason, the imaging device absorbs sensor variations by taking an average for every l line and displaying the amount of change. For this reason, objects with the same brightness in an image do not have the same temperature, making detailed analysis of objects in the image difficult.

[Means to solve the problem]

The present invention takes the following measures to solve the above problems.

That is, as an infrared imaging device, a plurality of infrared sensors arranged in a straight line, a means for scanning a subject and its vicinity in a one-dimensional direction and inputting light to the infrared sensor;
” - a first reference heat source provided outside the field of view of the liquid distribution object and on one side of the scanning direction; and a second reference heat source provided outside the field of view of the subject and on the other side of the scanning direction. A reference heat source and means for receiving the output of the infrared sensor and correcting and outputting the output signal of each sensor based on the signals of the first and second reference heat sources being output are provided.

[Function] With the above means, each sensor receives infrared rays at two preset temperatures from the first reference heat source and the second reference heat source each time the subject is scanned one time, and generates a corresponding signal. Outputs Va and Vb. The correction device inputs the signals Va and Vb from each sensor and the signal V(t) from the subject, corrects the signal v(t) based on the signals Va and Vb, and outputs the corrected signal. In this way, variations in the characteristics of each sensor are constantly corrected, and a faithful infrared image signal can be obtained.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. 1 and 2.

Note that the parts explained in the conventional example are given the same numbers and the explanation thereof is omitted, and the explanation will mainly be given to the parts related to the present invention.

In FIG. 1, a scanning mirror 2 that scans a subject 1 in one dimension is provided, and a row of infrared sensors 3 that receive reflected light from the scanning mirror 2 are provided. The row is provided along the rotation axis of the scanning mirror 2. Further, the output of the infrared sensor 3 is sent via an A/D converter 4 and a correction device 5 to a conventional image processing device (not shown). Further, a first reference heat source 1a and a second reference heat source 1b having different predetermined temperatures are provided on both outer sides of the field of view 2α of the scanning mirror 2 in the scanning direction.

In the above configuration, when imaging the subject 1, the scanning mirror 2 rotates back and forth around the axis and scans between the first and second reference heat sources 1a and Ib as shown in FIG. 2(a).

Then, each infrared sensor 3 receives the reflected light from the scanning mirror 2, and outputs, for example, a signal as shown in FIG. 4B for each scan. That is, the signal V from the reference heat source 1a
a, a signal V (t) from the subject I, and a signal vb from the reference heat source 1b are sent to the correction device 5 via the A/D converter 4.

The correction device 5 outputs a reference signal Va corresponding to a predetermined set temperature,
The signal ν(1) is corrected based on Vb and sent to a conventional image processing device. In this way, offset errors, temperature change errors, etc. of each infrared sensor 3 are corrected, and faithful video signals can be obtained.

〔Effect of the invention〕

As described above, according to the present invention, a reference heat source is imaged every scan and correction is performed based on the reference signal, so that variations in characteristics of each sensor are corrected and faithful images can be displayed.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of an embodiment of the present invention, FIG. 2 is an explanatory diagram of the operation of the same embodiment, and FIG. 3 is an explanatory diagram of the operation of a conventional example. la, Ib...Reference heat source 2...Scanning mirror 3...Sensor group 4...A/D converter 5...Correction device

Claims (1)

[Claims] a plurality of infrared sensors arranged in a straight line; a means for scanning a subject and its vicinity in a one-dimensional direction and transmitting light to the infrared sensor; a second reference heat source provided outside the field of view of the subject and on the other side of the scanning direction; and means for correcting and outputting the output signal of each sensor based on the signal of the second reference heat source.