JPH01102329A - Measuring apparatus of temperature by infrared ray - Google Patents

Abstract

PURPOSE:To enable the appropriate measurement of temperature with few parts that can not be measured, without troubling a user, by setting a central temperature automatically and also by setting it at a neutral temperature between the maximum and minimum temperature in a prescribed area of a substance to be measured. CONSTITUTION:When manual setting of a central temperature is selected by the operation of a keyboard 13 by a user, a selector switch 38 is connected onto the side (b), and a central temperature signal outputted from a central temperature setting circuit 12 in response to the operation of the keyboard 13 is supplied to a subtracter 8. Thereby the central temperature is set at a value corresponding to the operation of the keyboard 13. When automatic setting is selected in response to the operation of the keyboard 13, the switch 38 is connected onto the side (a) and a neutral temperature signal from a hold circuit 37 is supplied to the subtracter 8. Thereby the central temperature is set automatically at the neutral temperature between the maximum and minimum temperatures in a calculation area. Accordingly, the user is released from trouble by selecting the automatic setting of the central temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an infrared temperature measurement device suitable for use in non-contact measurement of the temperature of an object to be measured.

[Summary of the invention]

The present invention sequentially scans an object to be measured in the horizontal and vertical directions and two-dimensionally displays which region the temperature at each scanning position falls within a plurality of temperature regions centered on a predetermined temperature region. In an infrared temperature measuring device, the midpoint temperature between the maximum and minimum temperatures in a predetermined range of the object to be measured is detected, and the temperature of the central predetermined temperature range is automatically set to the midpoint temperature based on this detection signal. This allows appropriate measurements to be taken without bothering the user.

[Conventional technology]

FIG. 4 shows an example of an infrared temperature measuring device. In the figure, +1) is an infrared sensor, and this infrared sensor (υ) receives infrared rays emitted from the object to be measured (2) depending on the temperature through mirrors (3), (4) and the objective lens ( In this case, the mirrors (3) and (4) are scanning mirrors, and the focal position of the objective lens (5) is adjusted by these mirrors (3) and (4) to the object to be measured. (2) The upper surface is sequentially scanned in the horizontal direction H1 and the vertical direction ■.Therefore, the infrared sensor (1) receives the infrared rays emitted from each scanning position of the object (2) in sequence depending on the temperature. Figure 5 shows the object to be measured (2
) shows the horizontal and vertical scanning range (200).

The output signal of this infrared sensor (1) is proportional to the energy of the infrared rays supplied, and the output signal of the infrared sensor (1) is
When the temperature at each scanning position is T, it is proportional to T4 according to Stefan Boltzmann's law. Therefore,
The output signal of this infrared sensor (1) is supplied to a linearizer (7) via an amplifier (6), and is converted into a signal proportional to temperature T by this linearizer (7).

The output signal of this linearizer (7) is passed through a subtracter (8) and a gain switching circuit (91), and then converted into a digital signal of, for example, 8 bits per sample by an A/Di converter (10), and is converted into an image memory. (11) is supplied as image data and sequentially written.

In this case, the subtracter (8) includes a center temperature setting circuit (12).
A center temperature signal is supplied from the linearizer (7), and the center temperature signal is subtracted from the output signal of the linearizer (7). As will be described later, the color display is two-dimensionally color-coded to indicate which region the temperature at each scanning position of the object to be measured (2) falls within a plurality of temperature regions centered around a predetermined temperature region. However, the core temperature signal is displayed when the user enters the keyboard (13
) to set the temperature in the central predetermined temperature range (hereinafter referred to as "center temperature"), the center temperature setting circuit (
12) is controlled by the CPU (14) to produce a signal at a level corresponding to the set center temperature. Therefore, for example, when the temperature at the scanning position of the object to be measured (2) is equal to the set center temperature, the output signal of the subtracter (8) becomes O.

Further, the gain switching circuit (91) is composed of an amplifier, and the output signal of the subtracter (8) is amplified by a predetermined factor.

As mentioned above, the color display has two objects to be measured.
) is two-dimensionally color-coded to indicate which region the temperature at each scanning position falls within a plurality of temperature regions centered on a predetermined temperature region.
By operating the sensitivity setting circuit (92), the CPU (14) controls the gain switching circuit (9I).
) is changed to set the temperature difference between each temperature region, and therefore the sensitivity.

Here, (15) is a ROM, and (16) is a RAM.

Further, as described above, the color display displays a color par and a number indicating the temperature corresponding to the color par, in order to display the temperature of each color. The image data that displays the color par is C
It is written in advance to the image memory (11) from the PU (14). The number indicating the temperature changes according to the user's center temperature setting and sensitivity setting as described above, and the character data that displays this number is sent from the CPU (14) to the character memory (
17).

Also, the image memory (11) is controlled by the CPU (14).
), the image data is sequentially read out and supplied to a color conversion circuit (18) having a conversion table made of, for example, a ROM, where it is converted into three primary color signals of red, green and blue, and then supplied to an adder (19). be done. In this case, for example, the subtractor (
8) When the output signal is 0, it is converted so that green is displayed, and when the output signal is positive, it is converted so that the color becomes closer to red as the level increases. When is negative, as the level increases, the color will be displayed closer to blue. Further, under the control of the CPU (14), character data in the three primary colors of red, border, and blue are sequentially read out from the character memory (17) and supplied to the adder (19). In this case, for example, white numbers are displayed.

The three primary color signals from the adder (19) are converted into analog signals by a D/A converter (20) and then supplied to a color display (21). For example, the image shown in FIG. 6 is displayed on the screen (100) of this color display (21). In the same figure, (101) is
This is a display section in which a plurality of temperature regions of the object to be measured (2) are displayed in different colors.

Further, (102) is a color par, and (103) is a number indicating temperature. In this case, the center temperature and sensitivity (temperature difference between each temperature range) are the values set by the user.

[Problem that the invention seeks to solve]

By the way, according to the example in Fig. 4, the setting of the center temperature is as follows.
The user manually operates the keyboard (13), and the operation is extremely troublesome for the user. In order to avoid such troubles, it has been considered to automatically set the center temperature. For example, there is a method in which the center temperature is the temperature of the center point of the image or a specified point. However, with this method, the setting is valid only when the center point or designated point is the center temperature of the object to be measured, but in other cases there is a risk that there will be a part that becomes saturated and measurement becomes impossible. There is.

Further, for example, there is a method of setting the center temperature so that the temperature at the center point or a specified point of the image becomes the highest measured temperature. However, in this method, the setting is appropriate only when the center point or designated point has the highest temperature of the object to be measured, but in other cases there is a risk that there will be a portion that becomes saturated and cannot be measured.

The present invention takes these points into consideration and aims to enable appropriate temperature measurement without bothering the user.

[Means for solving problems]

The present invention sequentially scans an object (2) to be measured in horizontal and vertical directions, supplies an infrared sensor (11) with infrared rays emitted from each scanning position depending on the temperature, and detects the infrared sensor (t1). The output signal is converted into a signal corresponding to temperature by the linearizer (7), and based on this converted signal, the temperature at each scanning position of the object to be measured (2) is determined from among a plurality of temperature ranges centered around a predetermined temperature range. An infrared temperature measurement device that two-dimensionally displays which area the object is in (2).
A detection means for detecting the midpoint temperature between the maximum temperature and the minimum temperature in a predetermined range of is provided, and the temperature of the central predetermined temperature range is set to the midpoint temperature based on the output signal of this detection means. .

[Effect]

In the above configuration, the temperature of the central predetermined temperature region (
The center temperature) is automatically set based on the output signal of the detection means, which is convenient for the user. Also,
The temperature of this central predetermined temperature region is the temperature of the object to be measured (2).
Since the temperature is set at the midpoint between the maximum temperature and the minimum temperature in the predetermined range of , the occurrence of unmeasurable portions due to saturation is reduced.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. In FIG. 1, parts corresponding to those in FIG. 4 are designated by the same reference numerals, and detailed explanation thereof will be omitted.

In the figure, the output signal of the linearizer (7) is supplied to a peak hold circuit (32A) that holds the maximum value via a connection switch (31A), and is also supplied to a peak hold circuit (32A) that holds the minimum value via a connection switch (31B). The signal is supplied to the peak hold circuit (32B). Also,(
33) is a signal generation circuit;
) is supplied with a vertical scanning synchronizing signal VSS as shown in FIG. 2A, and a horizontal scanning periodic signal H3S as shown in FIG. 3A. In FIG. 2A and FIG. 3A, "l'vs" and "THB" respectively cover the vertical scanning period and the horizontal scanning period (see FIG. 5), and 1.
and 'l'HB indicate a vertical blanking period and a horizontal blanking period, respectively.

In this example, the calculation area (300) is set at the center position of the scanning range (200), as shown by diagonal lines in FIG. This calculation area (300) can be arbitrarily determined, for example, a range of A in the vertical direction and a horizontal direction, and therefore a range of A in area. That is, the second
As shown in Figure A, the period TVI is at the center of the vertical scanning period Tvs, and the horizontal scanning period '
The central % period THI of rH8 is taken as the peak hold calculation period.

From the signal generation circuit (33), the third
A signal S1 as shown in FIG. B is output, and this signal S1 is supplied as a control signal to the connection switches (31A) and (31B). Then, the connection switch (31A) and (
31B) is turned on during the period TRI and turned off during the other periods. Therefore, only the portion of the period THI of the output signal of the linearizer (7) as shown in FIG. 3C is supplied to the peak hold circuits (328) and (32B).

Further, (34A) and (34B) are reset connection switches connected to the peak hold circuits (32A) and (32B), respectively. The signal generation circuit (33) outputs a pulse signal S2 that rises in synchronization with the fall of the vertical scanning synchronization signal vSS as shown in FIG.
B) as a control signal. Then, the connection switches (34A) and (34B) are turned on during period T9,
The hold outputs of the peak hold circuits (32^) and (32B) are reset.

Further, the output signals of the peak hold circuits (32A) and (32B) are respectively supplied to an adder (35) and added. The output signal of this adder (35) is then applied to the multiplier (3
After being tripled in step 6), it is supplied to the hold circuit (37). This hold circuit (37) includes a signal generation circuit (
33) provides the signal S2. In the hold circuit (37), the output signal of the multiplier (36) is held at the timing of the rise of this signal S2. That is, at the end of each vertical scanning period, this hold circuit (37) stores the maximum value of the signal proportional to the temperature T obtained by the linearizer (7) when scanning the calculation area (300) in that vertical scanning period. and the summed average value of the minimum value is held. That is, the hold circuit (37) holds a midpoint temperature signal corresponding to the midpoint temperature between the maximum temperature and the minimum temperature in the calculation area (300).

A midpoint temperature signal corresponding to the midpoint temperature from this hold circuit (37) is supplied to the a-side fixed terminal of the changeover switch (38). A center temperature signal is supplied from the center temperature setting circuit (12) to the b-side fixed terminal of this changeover switch (38). The output signal of this changeover switch (38) is then supplied to a subtracter (8). In this case, switching of the changeover switch (38) is controlled by the CPU (14) in response to the user's operation of the keyboard (13). That is, when the user selects automatic setting of the core temperature, a
and when the user selects manual setting of the core temperature, it is connected to the b side.

Moreover, the midpoint temperature signal from the hold circuit (37) is CP
It is supplied to U (14).

This example is constructed as described above, and the rest is the same as the example shown in FIG.

In this example, when manual setting of the center temperature is selected by the user's operation of the keyboard (13), the selector switch (38) is connected to side b, and the center temperature is set according to the user's operation of the keyboard (13). Circuit (12)
The center temperature signal output from the subtractor (8) is supplied to the subtracter (8). This allows the core temperature to be adjusted to the user's keyboard (
13) is set to a value according to the operation.

Further, when automatic setting is selected in response to the user's operation on the keyboard (13), the changeover switch (38) is connected to the a side, and the midpoint temperature signal from the hold circuit (37) is sent to the subtracter (8). is supplied to Thereby, the center temperature is automatically set to the midpoint temperature between the maximum temperature and the minimum temperature in the calculation area (300).

In addition, in the case of manual setting, the number indicating the temperature displayed on the color display (21) changes according to the user's center temperature setting and sensitivity setting, as in the example in Fig. 4.
In the case of automatic setting, the temperature is changed according to the user's sensitivity setting and the midpoint temperature signal supplied from the hold circuit (37) to the CPU (14).

As described above, according to this example, selecting automatic setting of the center temperature eliminates the user's inconvenience. Further, according to this example, the center temperature is set to the midpoint temperature between the maximum temperature and the minimum temperature in the calculation area (300).
), it is possible to reduce the occurrence of portions that become saturated and unmeasurable.

〔Effect of the invention〕

According to the present invention described above, the center temperature is automatically set and is set to the midpoint temperature between the maximum temperature and the minimum temperature in a predetermined range of the object to be measured (2), which does not bother the user. Therefore, it is possible to perform appropriate temperature measurements with a small number of unmeasurable parts.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an embodiment of the present invention, FIGS. 2 and 3 are explanatory diagrams, and FIG. 4 is a configuration diagram of a conventional example.
FIG. 5 and FIG. 6 are diagrams for explaining the same. (1) is an infrared sensor, (2) is an object to be measured, (7) is a linearizer, (81 is an attenuator, (11) is an image memory,
(12) is a center temperature setting circuit, (17) is a character memory, (21) is a color display, (32A) and (32B) are peak hold circuits, (35) is an adder, (36) is a multiplier, (37) is a hold circuit, (38
) is a changeover switch.

Claims (1)

[Claims] The object to be measured is sequentially scanned in horizontal and vertical directions, and infrared rays emitted from each scanning position depending on the temperature are supplied to an infrared sensor, and the output signal of this infrared sensor is sent to a linearizer. The temperature is converted into a signal corresponding to the above temperature, and based on this converted signal, it is determined in two dimensions which region the temperature at each scanning position of the object to be measured falls into among a plurality of temperature regions centered on the predetermined temperature region. In the infrared temperature measuring device, a detection means for detecting the midpoint temperature between the maximum temperature and the minimum temperature in the predetermined range of the object to be measured is provided, and the temperature in the predetermined temperature range is determined based on the output signal of the detection means. An infrared temperature measuring device characterized in that the temperature is set to the above-mentioned midpoint temperature.