JPH08193885A - Radiation thermometer - Google Patents

Abstract

PURPOSE: To accurately and easily measure a surface temperature of an object to be measured. CONSTITUTION: A radiation thermometer comprises a temperature measuring section A that measures a surface temperature of an object to be measured by taking a radiant heat emitted from the surface thereof and a display section B that indicates the measured temperature. It further comprises a detection means C that detects whether or not a distance between the radiation thermometer and the object is in conformity with a preset measuring distance of the radiation thermometer and at least one of three means, i.e., an alarming means D that informs of the fact to an operator when the detection means C detects the agreement of the distances, a recording means E that records the measured temperature at that time and a holding means F that holds the indication of the measured temperature at that time for a prescribed time period.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiation thermometer for measuring the surface temperature of an object to be measured based on the radiant heat emitted from the surface.

[0002]

2. Description of the Related Art A radiation thermometer that measures the surface temperature of an object to be measured in a non-contact manner by measuring the radiant heat (thermal radiation energy) emitted from the surface of the object is measured by a radiation thermometer. Measurement is performed from a position that is a preset distance away from the warm object, but it is difficult to match the distance to the object to be measured with the preset measurement distance because it is non-contact. Is.

Therefore, in the conventional radiation thermometer, two laser beams are emitted from the thermometer side, and the actual distance and position from the thermometer to the object to be measured have a preset measurement distance and Part 2 in that it matches the position
The one configured to intersect the light rays of a book has been put into practical use. According to this, as the actual distance between the object to be measured and the radiation thermometer approaches the measurement distance, the measurement should be performed when the two spots by the laser light approach and finally reach one point. It will indicate the exact distance and position. For the same purpose, there is a configuration in which a convex lens is used and the point where the beam of aiming light is one point and the measurement distance and position of the radiation thermometer match. All of these facilitate the aiming of the radiation thermometer.

[0004]

However, the conventional technique as described above merely indicates that the radiation thermometer is aimed, and the temperature at the moment of the aim is maintained, It is not something to record. Therefore, the measurer performs the two tasks of confirming whether the aim is correct, that is, whether the measurement is from a predetermined distance and position, and reading the measured temperature displayed on the display of the thermometer. Therefore, there is a problem that the measurement work is complicated and difficult. Of course, the measured temperature at the moment of aiming can be displayed and held or recorded by manual operation such as pressing the operation button, but in that case, due to the hand shake accompanying the manual operation, the thermometer Since the position changes easily, errors due to such camera shake are unavoidable.

The present invention addresses the above problems in the conventional radiation thermometer, and an object thereof is to provide a radiation thermometer capable of accurately and easily measuring the surface temperature of an object to be measured. And

[0006]

To achieve the above object, according to the present invention, as shown in FIG. 1, the radiant heat emitted from the surface of an object to be measured is detected by a temperature sensitive element to determine the surface temperature of the object. In a radiation thermometer having a temperature measuring unit A for measuring without contact and a display unit B for displaying the measured temperature,
It is characterized by being configured as follows.

That is, the detection means C is provided for detecting that the distance from the thermometer to the object to be measured coincides with the preset measurement distance of the thermometer, and the detection means C detects the coincidence. At least one of the notifying means D for notifying the measurer of that fact, the recording means E for recording the measured temperature at that moment, or the holding means F for retaining the display of the measured temperature at that moment for a predetermined time. It is characterized by having one means.

The notifying means D is, for example, a means for notifying the measurer by voice or sound (audible means such as a voice generating circuit or a notification sound generating circuit), or a measurer by flashing light or light. It is possible to use an indicator (visual means such as a light emitting circuit or a blinking circuit using a light emitting element such as an LED) or an indicator (tactile means) to inform the measurer by vibration of the vibrator.

The recording means E may be built in the body of the radiation thermometer in advance, or may be separately connected to the outside of the body.

[0010]

According to the radiation thermometer of the present invention, accurate temperature measurement can be easily performed as follows.

First, in the state where the radiation thermometer is aimed at the measuring point of the object to be measured, the distance from the thermometer to the object to be measured is adjusted to the preset measuring distance of the thermometer. Move the thermometer back and forth. At this time, the radiant heat emitted from the surface of the object to be measured is captured by the temperature sensing element of the temperature measuring unit, and the surface temperature of the object is measured and displayed on the display unit.

In such a state, when the distance from the radiation thermometer to the object to be measured coincides with the measurement distance of the thermometer, the coincidence is detected by the detecting means.
And, when the radiation thermometer is equipped with the notification means,
Upon detection of a match with the measured distance, the notification means informs the measurer of the match by, for example, voice or light emission, and if a holding means is provided, the temperature of the display unit at the time of the match The display is held by the holding means for a predetermined time (for example, 3 seconds), and when the recording means is provided, the measured temperature at that moment is recorded by the recording means.

As described above, in the radiation thermometer of the present invention, when the distance from the radiation thermometer to the object to be measured coincides with the preset measuring distance of the thermometer, the automatic measurement is automatically performed. It is possible to inform the measurer of that fact, or to keep the display of the measured temperature at that moment for a predetermined time, or record the measured temperature at that time. Therefore, as long as the measurer matches the direction of the radiation thermometer with the direction of the object to be measured, the distance from the thermometer to the object to be measured can be set to a predetermined and accurate distance while only looking at the temperature display on the display. Can be easily matched to the measured distance,
Alternatively, they can focus solely on matching.
In other words, it is possible to concentrate on only one of the two tasks of matching the preset measurement distance and reading the measured temperature. This reduces the burden on the measurer.

Further, when the measured distance matches, the measured temperature at that moment is automatically notified, recorded or displayed and held without the manual operation of the measurer. Hand shake can be avoided, and as a result, accurate temperature measurement can be performed.

[0015]

Embodiments of the present invention will be described below. 2 is a diagram showing the measurement principle of the portable radiation thermometer according to the present embodiment, and FIG. 3 is a block diagram showing the circuit configuration of the thermometer.

As shown in these figures, the radiation thermometer 1 captures radiant heat emitted from the surface of the object 100 to be measured by a temperature sensitive element (eg, thermopile) 3 via a lens 2. The temperature measuring unit 4 for measuring the surface temperature of the measuring point 101 of the object and the display unit 5 made of, for example, a liquid crystal for displaying the measured temperature are provided, and the measuring point of the object 100 to be measured is measured from the thermometer. 101
A distance measuring unit for measuring the distance to is provided. The distance measuring unit includes a light projecting element 6 that emits light for distance measurement to a measuring point 101 of the temperature-measuring object 100, and a light receiving element that receives reflected light from the measuring point 101 (for example, PS).
D, one-dimensional CCD, etc.) 7 and a distance measuring circuit 8 for obtaining the distance to the measurement point 101 of the temperature-measured object 100 based on the output of this light receiving element. Then, while measuring the distance from the same thermometer to the measuring point 101 by this distance measuring section, the temperature of the measuring point 101 is measured by the temperature measuring section 4 after matching the preset measuring distance of the same thermometer. It is like this.

In addition to the above configuration, in the radiation thermometer 1 of this embodiment, the detection circuit 9 for detecting the coincidence between the distance measured by the distance measuring section and the preset measuring distance of the thermometer. And a sound generation circuit 1 that operates based on the output of the detection circuit 9
0, a holding circuit (not shown because it is built in the display unit 4 in the illustrated example), and a recording circuit (including a memory) 11 are provided. Then, when the detection circuit 9 detects a match between the two distances, the voice generation circuit 10 notifies the measurer by voice that the two distances match, based on the output from the circuit, and also displays the instantaneous display. The display of the measured temperature of the section 5 is held by the holding circuit, and the measured temperature at that moment is recorded by the recording circuit 11.

Next, the operation of this embodiment will be described. When measuring the surface temperature of the measurement point 101 in the temperature-measuring object 100 by the radiation thermometer 1 described above, first,
When aiming the lens 2 side toward the measurement point 101, the radiant heat emitted from the surface of the object is captured by the temperature sensitive element 3 via the lens 2 of the thermometer 1. As a result, the radiant heat from the temperature-measured object 100, that is, the output corresponding to the temperature of the object surface is input from the temperature sensing element 3 to the temperature measuring unit 4, and the temperature of the object surface is measured,
The measured temperature is displayed on the display unit 5.

On the other hand, the measurement point 1 of the temperature-measured object 100
When light is emitted from the light projecting element 6 toward the measurement point 101 in the state of being aimed at 01, the reflected light is received by the light receiving element 7. The output from the light receiving element 7 is input to the distance measuring circuit 8 to measure the distance from the thermometer 1 to the measurement point 101.

Therefore, the measurement point 10 thus measured
In order to match the distance to 1 with the preset measurement distance of the radiation thermometer 1, the measurement point 101 of the object to be measured 100
The thermometer 1 is moved back and forth relatively with the aiming at. Thus, the radiation thermometer 1 to the temperature-measured object 10
When the distance to 0 coincides with the measurement distance of the thermometer 1, the coincidence is detected by the detection circuit 9. Then, based on the output from the detection circuit 9 at this time, the voice generation circuit 10 notifies the measurer by voice that the distance to the measurement point 101 of the temperature-measured object 100 matches the measurement distance. At the same time, the display of the measured temperature of the display unit 5 at that moment is held for a predetermined time by the holding circuit, and the measured temperature at that moment is recorded by the recording circuit 11.

As described above, according to the above configuration, in the state where the radiation thermometer 1 is moved back and forth with respect to the object 100 to be measured and the distance to the object is adjusted to the preset measurement distance of the thermometer. When the two distances match, the measurer can automatically know the fact by voice, and can automatically perform the display holding and recording of the measured temperature at the time of the match. Therefore, the measurer need only concentrate on matching the distance measured by the distance measuring unit with the preset measured distance. As a result, the burden on the measurer in the case of measuring the surface temperature of the temperature-measuring object 100 in a non-contact manner is greatly reduced, and the temperature measurement from an accurate measurement distance can be extremely easily performed.

In the above embodiment, when the distance to the temperature-measured object matches the preset measurement distance, the measurer is informed by voice.
The light may be emitted or blinked by the light emitting element, or may be notified by a tactile means such as stimulating the sense of touch of the measurer.

In the above embodiment, the distance from the radiation thermometer 1 to the measuring point 101 on the object 100 to be measured is measured by inputting the output from the light receiving element 7 to the distance measuring circuit 8, and this measurement is performed. The detection circuit 9 detects the coincidence between the measured distance of the thermometer and the preset measurement distance of the thermometer. However, in the present invention, the distance itself from the radiation thermometer 1 to the measurement point 101 is not known. ,
It can be seen that the distance from the thermometer 1 to the measurement point 101 coincides with a preset measurement distance of the thermometer, in other words, the focus of the thermometer coincides with the measurement point 101 of the temperature-measured object 100. Since the above is sufficient, the distance measuring circuit 8 as described above is not essential to the present invention.

FIG. 4 shows such another embodiment of the present invention. In the radiation thermometer 21 of this example, as a means for matching the distance from the thermometer 21 to the measurement location 201 of the temperature-measured object 200 with a predetermined measurement distance, for example, a generally-used proximity switch is generally used. Projector element 2
A light projecting / receiving system including 6 and the light receiving element 27 is used. Then, the focus of the light emitting and receiving system and the focus of the temperature sensing element 23, which is provided in the thermometer 21 and is made of, for example, a thermopile, are matched at a preset measurement distance of the thermometer 21 (so-called focus is adjusted). When the measurement location 201 of the temperature-measured object 200 is located at such a focal position, the light from the light projecting element 26 is reflected at the measurement location 201 and is input to the light receiving element 27. When the output of the light receiving element 27 becomes maximum and the maximum output of the light receiving element 27 is input to a detection circuit (not shown), the distance from the thermometer 21 to the measurement point 201 of the temperature-measured object 200 in the detection circuit is increased. And a preset measurement distance of the thermometer 21 is detected.

According to such a configuration, the radiation thermometer 21
While the light from the light projecting element 26 in FIG.
The focal point of the object to be measured 200 can be easily matched, and the output of the light receiving element 27 is maximized to be input to the detection circuit at the time of matching, so that the distance to the measurement point 201 of the temperature-measured object 200 is previously set. The set thermometer 21
It is possible to easily know that the measurement distance coincides with the measurement distance, that is, the focus of the thermometer 21 coincides with the measurement point 201 of the temperature-measured object 200. Therefore, by processing the output of the detection circuit at this time in the same manner as in the first embodiment, it is possible to accurately measure the temperature at the measurement point 201 of the temperature-measured object 200.

Further, in each of the above-mentioned embodiments, it is possible to easily find the temperature abnormal portion in the object by using the light emitted from the radiation thermometer. That is, for example, when the temperature of an object is abnormal and the position of the light is unknown, if the position of the light is changed, the temperature of the light is abnormal. Therefore, it becomes possible to accurately find a specific position showing an abnormal temperature.

[0027]

As described above, according to the present invention, when the distance to the object to be measured coincides with the preset measurement distance of the radiation thermometer, in other words, the focus of the thermometer is the object to be measured. When it coincides with the measurement point of, the measurer is automatically informed of it, or the display of the measured temperature at that moment is held for a predetermined time, or the measured temperature at that moment is recorded. The burden is greatly reduced, and temperature measurement from an accurate measurement distance can be performed extremely easily. Further, particularly when the radiation thermometer is configured to emit light for aiming or guiding, it is possible to accurately find a position showing a specific temperature by using such light. For example, when there is a temperature abnormality somewhere in the object, it is an effective means for checking the position of such a temperature abnormality portion.

[Brief description of drawings]

FIG. 1 is a claim correspondence diagram showing the overall configuration of the present invention.

FIG. 2 is an explanatory diagram used to show a measurement principle of a radiation thermometer according to an embodiment of the present invention.

FIG. 3 is a block diagram showing a circuit configuration of the radiation thermometer.

FIG. 4 is a diagram showing a partially simplified structure of a radiation thermometer according to another embodiment of the present invention.

[Explanation of symbols]

1, 21 ... Radiation thermometer 3, 23 ... Temperature sensitive element 4, A ... Temperature measuring section 5, B ... Display section 6, 7, 8, 9, 26, 27, C, D ... Detecting means (6, 26 ... Projecting element, 7, 27 ... Photoreceiving element,
8 ... Distance measuring circuit, 9 ... Detection circuit) 10, E ... Notification means (10 ... Voice generation circuit) 11, F ... Recording means (11 ... Recording circuit) G. ..Holding means 100, 200 ... Object to be measured 101, 201 ... Measurement location

Claims (1)

[Claims] 1. A temperature measuring unit for measuring radiant heat emitted from the surface of an object to be measured by a temperature sensitive element and measuring the surface temperature of the object in a non-contact manner, and a display unit for displaying the measured temperature. In a radiation thermometer having a and a detection means for detecting that the distance from the thermometer to the object to be measured coincides with a preset measurement distance of the thermometer, and the detection means detects the coincidence. At least one means of notifying means for notifying the person of measurement when detected, recording means for recording the measured temperature at that moment, or holding means for retaining the display of the measured temperature at that moment for a predetermined time A radiation thermometer characterized by being equipped with.