JPH11281481A - Radiation temperature detecting element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radiation temperature detecting element which eliminates a waiting time and stably measures the temperature in non contact under such a state as changing an ambient atmosphere temperature. SOLUTION: An approximately recessed, for example, metal can 3 is connected to a stem 1 where a lead 2 formed by penetrating from one surface side through the other surface side is integrally molded and the stem 1 and the can 3 constitute a space. An opening part, is formed in a recessed part, bottom face of the can 3 and an infrared transmission filter 4 is sealed in the opening part. A support body 5 is provided on the lead 2 rising from the stem 1 in the space and an infrared detecting element 6 and a thermistor 7 which is a contact type temperature detecting element for measuring the temperature of the infrared detecting element 6 are mounted on the support body 5. In this case, the lead 2 raising the support body 5 is jointly served as a signal output terminal of the infrared detecting element 6 and the thermistor 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a radiation temperature detecting element used for a radiation thermometer that detects temperature in a non-contact manner using infrared rays.

[0002]

2. Description of the Related Art Conventional radiation thermometers, particularly, for example, 0 to 500
In a medium to low temperature range such as ° C, a thermal infrared detecting element is mainly used, and as the thermal infrared detecting element, a pyroelectric element using a chopper or a thermopile element is used.

In order to actually measure the temperature in a non-contact manner using infrared light, it is necessary to detect infrared light and measure the temperature of the infrared light element. That is, the temperature difference between the infrared element and the object can be calculated from the infrared light incident on the infrared detection element, and the absolute temperature of the object can be measured by adding the element temperature of the infrared element to this value.

Conventionally, the absolute temperature of an object has been measured using an infrared element such as a thermopile and a contact-type temperature detecting element such as a thermistor. More specifically, the temperature of the infrared device was replaced by the temperature of the can package by attaching an external thermistor to the can package type infrared device or bonding the thermistor to the stem side in the can package. .

[0005]

As described above, as described above,
If the temperature of the infrared element is measured by attaching a thermistor to the outside of the can package or to the stem side in the can package, the atmosphere in which the radiation temperature detection element including the infrared element and the contact-type temperature detection element is used is used. When the temperature changes, first, the temperature of the outer periphery of the can package changes, and in particular, the can having a small heat capacity of the package changes, and thereafter, the stem having a large heat capacity changes from the outside and the bonded portion to the can, and the thermistor, the infrared element The temperature changes in order.

For this reason, it is necessary to surround the radiation temperature detecting element with a metal block having a very large heat capacity and to wait for the temperature to stabilize.

The standby time increases as the measurement accuracy increases, and even if the time required to convert the temperature from infrared rays is less than 1 second, the standby time extends to tens of minutes, which poses a problem in practical use. is there.

[0008] The present invention has been made in view of the above points, and an object thereof is to eliminate a waiting time,
An object of the present invention is to provide a radiation temperature detecting element capable of stably measuring a temperature in a non-contact manner even under a situation where an ambient temperature changes.

[0009]

According to the first aspect of the present invention,
A support is arranged in a space formed by a stem and a can having an opening that transmits infrared rays so as not to come into contact with the stem and the can, and an infrared detecting element and a contact-type temperature detector are provided on the support. It is characterized by mounting the element.

According to a second aspect of the present invention, in the radiation temperature detecting element according to the first aspect, a gap is provided inside the can.

According to a third aspect of the present invention, in the radiation temperature detecting element according to the first or second aspect, a contact-type temperature detecting element is provided on the can in the space. .

According to a fourth aspect of the present invention, in the radiation temperature detecting element according to the third aspect, a paint having a constant infrared emissivity is applied to the can in the space.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

Embodiment 1 FIG. 1 is a schematic configuration diagram of a radiation temperature detecting element according to an embodiment of the present invention. In the radiation temperature detecting element according to the present embodiment, a substantially concave, for example, metal can 3 is connected to a stem 1 integrally formed with a lead 2 penetrating from one surface side to the other surface side. The stem 1 and the can 3 constitute a space. An opening is formed in the bottom of the concave portion of the can 3, and an infrared transmitting filter 4 is sealed in the opening.

A support 5 is provided on the lead 2 rising from the stem 1 in the space. On the support 5, an infrared detecting element 6 and a contact-type temperature measuring element temperature of the infrared detecting element 6 are provided. A thermistor 7 serving as a detection element is mounted. Here, the lead 2 lifting the support 5 is
Also serves as an output terminal for the signals of the infrared detecting element 6 and the thermistor 7.

Therefore, in the present embodiment, by separating the infrared detecting element 6 and the thermistor 7 from the stem 1 using the support 5, the temperature change transmitted directly from the stem 1 and the can 3 can be greatly reduced. Therefore, the infrared detecting element 6 and the thermistor 7 change with a very long time constant compared with the temperature change of the stem 1 and the can 3, and are stable even when the temperature of the stem 1 and the can 3 change. Radiation temperature can be detected.

The infrared detecting element 6 and the thermistor 7
Is mounted on one support member 5, the temperature changes with the same temperature gradient, and the temperature can be stably measured in a non-contact manner even under a situation where the ambient temperature changes.

Embodiment 2 = FIG. 2 is a schematic configuration diagram of a radiation temperature detecting element according to another embodiment of the present invention. The radiation temperature detecting element according to the present embodiment is different from the radiation temperature detecting element shown in FIG. 1 as the first embodiment in that a gap is provided in a double structure instead of the can 3, and the gap is formed by the air layer 8a. Can filled with 8
This is a configuration using.

In the present embodiment, the can 8
Although the air layer 8a is provided in the inside, the present invention is not limited to this, and another gas may be filled or vacuum may be applied.

Normally, the heat capacity of the stem 1 differs from that of the can 3 due to the difference in thickness, and when the ambient temperature changes, first the temperature of the can 1 tends to change. However, in the present embodiment, the double structure is used. Since the can 8 having the air layer 8a therein is used, temperature fluctuations in the space formed by the stem 1 and the can 8 can be reduced.

Embodiment 3 = FIG. 3 is a schematic configuration diagram of a radiation temperature detecting element according to another embodiment of the present invention. The radiation temperature detecting element according to the present embodiment has a configuration in which the thermistor 9 is adhered to the inner surface of the can 3 in the radiation temperature detecting element shown in FIG.

Therefore, in the present embodiment, by measuring the temperature of the can 3 with the thermistor 9, it is possible to estimate the degree of the output change of the infrared detecting element 6 due to the temperature change of the can 3.

Embodiment 4 = FIG. 4 is a schematic configuration diagram of a radiation temperature detecting element according to another embodiment of the present invention. The radiation temperature detecting element according to the present embodiment differs from the radiation temperature detecting element shown in FIG. 3 as the third embodiment in that the portion included in the viewing angle of the infrared detecting element 6 on the inner surface of the can 3 is determined in advance by the emissivity. This is a configuration in which a known paint 10 (for example, a black paint) is applied.

Therefore, in the present embodiment, the temperature of the can 3 can be obtained more accurately, and the radiation temperature can be stably detected even when the temperature of the can 3 changes.

In the third and fourth embodiments, the can 3 is used. However, the present invention is not limited to this, and the can 8 may be used.

[0026]

According to the first aspect of the present invention, a support is arranged in a space formed by a stem and a can having an opening for transmitting infrared rays so as not to contact the stem and the can. Since the infrared detecting element and the contact type temperature detecting element are mounted on the support, it is not affected by the temperature change of the stem and the can, so that the infrared detecting element and the contact type temperature detecting element are not affected by the temperature change of the stem and the can. It changes with a very long time constant, and furthermore, since the infrared detecting element and the contact-type temperature detecting element are mounted on one support, it changes with the same temperature gradient, eliminating standby time and reducing ambient temperature. A radiation temperature detecting element capable of stably measuring the temperature in a non-contact manner even in a situation where the temperature changes may be provided.

According to a second aspect of the present invention, in the radiation temperature detecting element according to the first aspect, a cavity is provided inside the can, so that in addition to the effect of the first aspect, the present invention comprises a stem and a can. The temperature change transmitted in the space to be performed can be made very slow.

According to a third aspect of the present invention, in the radiation temperature detecting element according to the first or second aspect, a contact-type temperature detecting element is provided on the can in the space. In addition to the effects of the invention, it is possible to obtain information on the temperature change of the can that falls within the viewing angle of the infrared detecting element. Even when the temperature of the stem and the can change, the infrared ray entering from the can is removed by signal processing. And only the infrared rays from the target object can be calculated.

According to a fourth aspect of the present invention, in the radiation temperature detecting element according to the third aspect, a paint having a constant infrared emissivity is applied to the can in the space. In addition, it is possible to more accurately obtain can temperature change information.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a radiation temperature detecting element according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a radiation temperature detecting element according to another embodiment of the present invention.

FIG. 3 is a schematic configuration diagram of a radiation temperature detecting element according to another embodiment of the present invention.

FIG. 4 is a schematic configuration diagram of a radiation temperature detecting element according to another embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 stem 2 lead 3 can 4 infrared transmitting filter 5 support 6 infrared detecting element 7 thermistor 8 can 8a air layer 9 thermistor 10 paint

Claims (4)

[Claims] 1. A support is arranged in a space formed by a stem and a can having an opening through which infrared light passes so as not to contact the stem and the can, and an infrared detecting element is provided on the support. And a radiation temperature detecting element comprising a contact temperature detecting element. 2. The radiation temperature detecting element according to claim 1, wherein a void is provided inside the can. 3. The radiation temperature detecting element according to claim 1, wherein a contact-type temperature detecting element is provided on the can in the space. 4. A radiation temperature detecting element according to claim 3, wherein a paint having a constant infrared emissivity is applied to said can in said space.