JPS60198422A - Infrared video device - Google Patents

Abstract

PURPOSE:To measure temperature with high precision by setting a range on the basis of the temperature difference between two optional points on a display screen. CONSTITUTION:Infrared rays radiated from a body to be measured are converted by an infrared detector into a video signal A, which is inputted as a signal B to the 2nd video memory 5 through a video amplifier 1. It is outputted successively in a memory free time and displayed 4 by one screen as a temperature pattern through a range setting part 8. Vertical and horizontal cursors X and Y are set in crossing relation at two points C and D and position signals (c) and (d) corresponding to the points C and D are generated by an address signal generation part 6 and outputted to memory 5. Picture element signals of the points C and D are read out of the memory 5 with the signals (c) and (d) and outputted to an arithmetic circuit 7. The circuit 7 processes the picture element signals of the points C and D and outputs the temperature difference value DELTAT to a setting part 8 as a temperature difference value signal T. The setting part 8 is controlled with the signal T to determine the range as the temperature width of the value DELTAT. Then, the one-screen signal outputted from the memory 5 is displayed 4 within the range temperature range of the temperature difference DELTAT.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to an infrared imaging device that measures a displayed temperature pattern using a predetermined temperature range, and particularly relates to an infrared imaging device that automatically sets the predetermined temperature range and detects temperature differences within a predetermined range. This invention relates to an infrared imaging device that has been improved to measure .

To) Conventional technology and problems The amount of infrared rays emitted by an object is proportional to the temperature of the object, and an infrared imaging device captures the infrared rays emitted by the object with an imaging unit, and converts the captured infrared rays into analog data using an infrared detector. The temperature pattern of the imaged object is displayed on the display unit by converting it into a signal. A conventional infrared imaging device measures a temperature difference in a predetermined area of an object to be measured, as shown in the block diagram of FIG.

That is, one screen of infrared rays emitted from an object to be measured (not shown) is captured in about 4 seconds by horizontal and vertical sweeping of the imaging section. The infrared rays captured by this horizontal and vertical sweeping are sequentially photoelectrically converted into an analog video signal A by an infrared detector.

Next, as shown in the block diagram of FIG. 1, the photoelectrically converted analog video signal A is amplified by a video amplifier 1 and input as a signal B to the range switching circuit 2. The range switching circuit 2 changes the range, for example, to 1°C, 2°C, 5°C, 10°C,
20℃ if it has a 5-step range switching of 20℃
Based on the voltage of the range, the voltage of input signal B is multiplied by 20 times in the 1°C range, and multiplied by 10 times in other ranges.

The image is amplified 4 times and 2 times in proportion to the range temperature ratio and output to the first image memory 3. The first image memory 3 converts the input analog signals from the respective ranges into digital signals, temporarily stores them in the memory section, and uses the free time of the memory to convert the input analog signals from the respective ranges into digital signals. The memory signals are sequentially released, converted back into analog 1cog signals, and output to the display unit 4. The display unit 4 receives one screen worth of analog signals that are sequentially input and displays them on a cathode ray tube as a temperature pattern of the object to be measured.

In this infrared device, when measuring the temperature at two points in the display temperature pattern -L, in order to achieve the most accurate temperature measurement, conventionally the operator measures the temperature at the two points, and the temperature difference The temperature range corresponding to the calculated temperature difference is selected from among the five ranges, and 2 is displayed on the display.
The aim was to obtain a pattern that could display the maximum temperature difference in the dot areas.

In this conventional method, the temperature range to be selected is fixed, so it is not possible to subdivide the range for more accurate measurement, that is, to obtain a range that matches the temperature difference, and the temperature difference between two areas cannot be obtained. The disadvantage is that accurate temperature measurement may not be possible because the maximum temperature cannot be displayed.

(()) Purpose of the Invention The present invention was devised in view of the conventional drawbacks mentioned above.The purpose of the present invention is to set the range based on the temperature difference between any two points on the display screen, thereby making it possible to measure temperature. An object of the present invention is to provide an infrared imaging device with improved accuracy.

According to the present invention, in a device that captures infrared rays emitted from an object and displays the temperature pattern of the object, any two points in the image of the displayed temperature pattern can be detected. It is characterized by providing means for detecting temperature and means for setting a temperature range based on the temperature difference between the detected temperatures, and displaying a temperature pattern in a range corresponding to the output of the temperature range setting means. This is accomplished by infrared imaging equipment.

+61 Embodiment of the Invention An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 2 is a block diagram showing the configuration of an infrared device according to the present invention, and the same reference numerals as in FIG. 1 indicate the same parts.

That is, the infrared device of the present invention captures infrared rays emitted from an object to be measured (not shown) by horizontal and vertical sweeping of an imaging section, and converts the captured infrared rays into an analog video signal A using an infrared detector.

Next, as shown in the block diagram of FIG. 2, the converted analog video signal A is input to the video amplifier 1. The video amplifier 1 amplifies the input analog signal A and outputs it as an analog signal B to the second image memory 5. The second image memory 5 converts the sequentially input analog signal B into a digital signal and stores it in memory for one screen. In this embodiment, both the horizontal and vertical axes of the screen are divided into 220 equal parts to divide the screen into 48,400 sections, and digital signals are input into the divided sections in accordance with the horizontal and vertical sweeps of the imaging section. (pixels) for one screen.

Next, the digital signals stored in the second image memory 5 are sequentially released using the memory free time and are outputted to the display section 4 via the range setting section 8. The display unit 4 displays the input image signals for one side as a temperature pattern on the cathode ray tube, and also displays an address corresponding to the operation by operating the joystick 9, as shown in an example diagram of the display unit 4. It has a function of displaying the position and temperature value of the intersection of the horizontal cursor X and the vertical cursor Y, which move in the vertical and horizontal directions, respectively, based on the cursor position signal output from the signal generator 6.

When measuring the temperature difference between the two points 0 and D displayed on the display section 4, the vertical cursor Y and horizontal cursor
By setting the position signals to intersect on the points 0 and D, the address signal generator 6 generates the position signals C and d corresponding to the 0 point and the D point as described above, and outputs them to the second image memory 5. Ru. The image memory 5 reads out pixel signals at points 0 and D based on these position signals C and d, and outputs them to the arithmetic circuit 7. The calculation port FI8.7 calculates the pixel signals at the 0 point and the D point, and outputs the temperature difference value T to the range setting unit 8 as a temperature difference value signal T.

The range setting unit 8 is controlled by the input temperature difference value signal T, and sets a range in which the temperature difference value has a temperature range of T.

With this range setting, one screen worth of digital signals output from the second image memory will be displayed on the display unit 4 within the range temperature range based on the temperature difference of ΔT, and 6! !
The image display makes full use of the temperature range, allowing for highly accurate temperature measurements.

(fl Effects of the Invention As is clear from the above explanation, the present invention detects a temperature difference between two points that are the measurement area of a temperature pattern, and uses the detected temperature difference as the temperature range width. This has the effect of being able to accurately measure temperature differences between regions.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a conventional infrared device, and FIG. 2 is a block diagram showing the configuration of an infrared device according to an embodiment of the present invention. In the figure, 1 is a video amplifier, 2 is a range switching circuit,
3 is a first image memory, 4 is a display section, 5 is a second image memory, 6 is an address section, 7 is an arithmetic circuit, 8 is a range setting section, and 9 is a joystick.

Claims (1)

[Claims] In a device that captures infrared rays emitted from an object and displays a temperature pattern of the object, the device includes means for detecting temperatures at any two points in an image of the displayed temperature pattern, and a temperature difference between the detected temperatures as a reference. 1. An infrared imaging device comprising: means for setting a temperature range; and a temperature pattern is displayed in a range corresponding to the output of the temperature range setting means.