JPS6039787Y2 - thermography equipment - Google Patents

Description

[Detailed description of the invention] The present invention relates to a thermography device that acquires an infrared image (temperature distribution image) of a subject, and in particular has a function that can stop vertical scanning of an optical scanning mechanism, such as a time change display function or a line display function. The present invention relates to a thermography device having functions.

In a thermography device, an optical scanning mechanism raster-scans an image of an infrared detector on a subject, and a detection signal obtained from the detector along with the scanning is raster-scanned in synchronization with the scanning by the scanning mechanism. cathode ray tube (CRT)
An infrared image of the subject is formed on the CRT screen.

When displaying changes over time, the display system continues raster scanning, stops only the vertical scanning by the optical scanning mechanism, and repeatedly scans the detector image horizontally at the same position on the subject. The above temperature change over time is displayed as a brightness modulation image developed vertically on a CRT.

In addition, when performing line display, an optical scanning mechanism and CRT are used.
The vertical scanning at C is stopped, the detector image is repeatedly scanned horizontally at the same position on the subject, and the obtained detection signal is
The detection signal is displayed as a waveform by supplying it to RT as a vertical deflection signal.

Conventionally, in order to specify the location where these time-varying displays and line displays are to be performed, the infrared image is first observed by slow scanning (for example, a frame time of several seconds), and when the raster arrives at the part to be measured, the time-varying display or line display is performed. The display selection switch is turned ON to stop the vertical scanning of the optical scanning mechanism, but since the raster is moving, it is not easy to press the switch at the same time and requires skill. Met.

The present invention has been made in view of this point, and it is an object of the present invention to provide a thermography apparatus that can easily and accurately specify the location where a line display is to be performed.

The present invention will be explained in detail below using the drawings.

FIG. 1 is a block diagram showing an example of implementing the present invention for a thermography device having a function of displaying changes over time.
In the figure, 1 is an infrared detector, and 2 is an optical scanning mechanism for raster scanning the image of the detector 1 on a subject.

The scanning mechanism includes a horizontal driving means 3H and a vertical driving means 3v connected to a power source, and the driving means 32 is disconnected from the power source by a switch 4 when displaying a change over time and stops its operation.

The scanning mechanism 2 scans the field of view horizontally and vertically and sequentially makes infrared rays from the subject enter the detector 1, and also makes reference infrared rays generated from a reference temperature source 5 enter the detector 1 every blanking period of each horizontal scan. let

The detection signal obtained from the detector 1 is sent to the processing circuit 7 via the amplifier 6, where it undergoes clamp processing, linearity correction, etc., and is converted into a temperature signal corresponding to the absolute temperature of the subject. be done.

The obtained temperature signal is sent via switch 8 to the grid of CRT 9 as a brightness signal.

The horizontal and vertical deflectors 10H and IOV of the CRT 9 receive horizontal and vertical synchronizing signals 11H and IOV generated from the scanning mechanism 2.
Horizontal and vertical scanning signals 13H and 113V generated in the scanning circuit 12 based on mV are supplied directly or via switches 17 and 14, so that the absolute image of the object is displayed on the screen of the CRT 9, for example, as shown in FIG. A temperature distribution image Z is displayed with brightness depending on the temperature.

15 is an adder circuit that adds a shift voltage from a fixed power supply 16 to the temperature signal, and the output signal of the adder circuit 15 is sent to the deflector 10V via a switch 17 and the switch 14.
sent to.

18 is a coincidence detector, and 19 is a potentiometer that generates an adjustable designated voltage. The detector 18 compares the vertical scanning signal 13V with the designated voltage, and when the two match, generates a coincidence pulse and determines the timing. to the circuit 20.

The timing circuit 20 receives the coincidence pulse and the horizontal scanning signal 1.
A switching signal 21 is generated based on 3H, and the switching signal 21 is
is sent to the switches 8 and 17.

The switch 8 is switched to the fixed power supply 22 side by the switching signal.

23 is a D-flip-flop whose clock terminal is supplied with the above-mentioned switching signal, and whose D input terminal is connected to a high-level power supply via a time change display selection switch 24.

The Q output signal is then sent to the switches 4 and 14, and the Q output signal turns off the switch 4 and switches the switch 14 to the sawtooth wave oscillator 25 side.

In the above-described configuration, first, the selection switch 24 is turned OFF, and a normal temperature distribution image Z as shown in FIG.
and search for the area where you want to observe changes over time.

At this time, the coincidence detector 18 compares the vertical scanning signal 13V as shown in FIG. 3a with the designated voltage level L, and generates a coincidence pulse (FIG. 3b) when the two match.

The timing circuit 20 receives the coincidence pulse and the horizontal scanning signal 13.
Based on H (FIG. 3C), a switching signal (FIG. 3D) 21 which becomes 44199 during one horizontal scanning period that first comes from the time when the coincidence pulse is generated is created.

The switching signal 21 causes the switch 8 to switch to the fixed power supply 2 during that period.
During that period, the switch 17 is also turned to the addition circuit 15 side, so the temperature signal obtained during that one horizontal scanning period is sent to the vertical deflector 1 via the switch 17.14.
0V as a deflection signal.

Therefore, the temperature signal waveform W during that period will be displayed on the screen of the CRT 9, as in a normal oscilloscope.

The shift voltage from the fixed power supply 16 is appropriately set to a value such that the temperature signal waveform is displayed at a position that does not overlap the image Z, as shown in FIG.

During the period when the temperature signal waveform W is drawn in this way, one raster forming the image Z is missing, so a black line ■ is displayed at the position of the missing raster, and the line ■ is It is used as a marker to indicate the position from which the temperature waveform W was extracted.

That is, by operating the potentiometer 19 to change the designated voltage, the marker can be moved up and down in the image, allowing the observation of the temperature signal waveform at any desired portion.

The present invention is characterized in that the vertical scanning is stopped when the vertical scanning reaches the marker indicating the position from which the temperature waveform W was extracted, and a change over time is displayed.

That is, after setting the marker to an appropriate position, switch 24 is pressed.
When turned on, the output of the flip-flop 23 does not immediately become °1', but the image Z continues to be displayed.

Then, when the raster reaches the marker position and a switching signal 21 is generated, the signal 21 causes the Q output of the flip-flop 23 to become °1'.

Therefore, the switch 4 is turned OFF by the Q output signal, and the vertical scanning in the scanning mechanism 2 is stopped at the position corresponding to the marker position, and only the horizontal scanning is repeatedly performed at that position.

At the same time, the switch 14 is also turned to the oscillator 25 side by the Q output signal, so that the CRT 9 continues to be vertically scanned by the scanning signal from the oscillator 25 instead of the vertical scanning signal 13V from the scanning circuit 12. .

Therefore, rasters are drawn sequentially from top to bottom on the screen of the CRT 9, and each raster is given a brightness according to the temperature signal obtained by scanning the same place little by little with the scanning mechanism 2 at different times. , the temperature change over time on the same line is displayed as a brightness modulation image developed in the vertical direction of the CRT.

As described above, according to this embodiment, the marker that indicates the position when extracting the temperature signal and displaying it as a waveform also serves as the marker that indicates the position where the change over time is displayed, so the positioning for displaying the change over time is done by manually adjusting the marker. Anyone can easily and accurately align the position by simply moving it to the desired position.

FIG. 4 is a block diagram showing an example in which the present invention is implemented in a thermography apparatus having a line display function.

Components in this figure that are the same as those in the embodiment of FIG. 1 are designated by the same numbers and their explanations will be omitted.

In this embodiment, the switch 14 and the oscillator 25 are omitted, and in addition to the switching signal 21, the flip-flop 2
3 to also send the Q output signal to switches 8 and 17.
An R gate 26 is provided.

Also in this embodiment, while the switch 24 is OFF, the switching signal 21 is sent to the switches 8 and 17 via the OR gate 26, so the image Z1 waveform W and marker I are displayed as shown in FIG.

Then, when the switch 24 is turned on, the output Q of the flip-flop 23 does not become 1'° immediately, but becomes "1" when the raster reaches the marker position and a switching signal is generated, so that the switch 4 is turned on. OFF and scanning mechanism 2
The vertical scanning in is stopped at a position corresponding to the marker position.

At the same time, the output Q sent through the OR gate 26 causes the switch 8 to be connected to the fixed power supply 22, and the switch 17
are continuously pushed to the adder circuit 15 side, so CR
On the screen of T9, the temperature signal waveform obtained by repeatedly horizontally scanning the same location by the scanning mechanism 21 is displayed as shown in FIG. 5, and a line display is performed.

In this embodiment as well, the marker indicating the position where the temperature signal is extracted and displayed as a waveform also serves as the marker indicating the position where the line display is performed, so alignment can be performed accurately and easily.

[Brief explanation of the drawing]

1 and 4 are block diagrams showing the configuration of an embodiment of the present invention, FIGS. 2 and 5 are diagrams showing the display state of a CRT screen, and FIG. 3 is a diagram for explaining the operation of the embodiment. FIG. 1: Infrared detector, 2: Optical scanning mechanism, 3■: Vertical direction driving means, 4. 8. 14. 17. 24: Switch, 9: CRT, 10H, 10V: Deflector,
18: coincidence detector, 19: potentiometer, 20: timing circuit, 23: D-flip-flop, 25: sawtooth oscillator, 26: OR gate.

Claims (1)

[Scope of utility model registration request] an infrared detector, an optical scanning mechanism for horizontally and vertically scanning an image of the detector over a subject, and a detection signal that is horizontally and vertically scanned in synchronization with the scanning mechanism and obtained from the detector; is supplied as a luminance signal and displays an infrared image of a subject; and means for generating a switching signal when the vertical scanning of the cathode ray tube reaches a predetermined position, the detection signal being output based on the switching signal. in a thermography apparatus configured to supply a vertical deflection signal to a cathode ray tube and display a detection signal waveform simultaneously with an infrared image, further comprising means for stopping vertical scanning by the optical scanning mechanism;
A thermography apparatus characterized in that the stopping means is actuated based on the switching signal.