JP2000254103A - Radiation thermometer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To more correctly compensate temp. even when heat balance between a light guide means and an infrared-ray sensor becomes off by providing an insulating means for thermally insulating the light guide means, a high temp. conductive member and the infrared-ray sensor. SOLUTION: An infrared-ray made incident from a window member 15 arrives at an infrared-ray sensor 18 by the guide if a light guide pipe 17 which is termally connected by an aluminum block 16 being a high temp. conducive member. Then a part between and end surface at the side of the radiation port 17b of the pipe 17 and the sensor 18 s kept at prescribed interval (d) in order not to permit them to be brought into direct contact with each other by a low temp. conductive optical system connecting member 30 which is formed by a polyethylene plastics or the like as the heat insulating means for thermally insulating the pipe 17, the block 16 and the sensor 18, Besides, the block 16 is arranged nearer to the pipe 17 than the end surface at the side of the pipe 17 of the sensor 18 in order not to permit the block 16 to be brought into contact with the sensor 18 and also the sensor 18 is prevented from being affected by the block 16.

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 temperature in a non-contact manner by detecting thermal radiation energy radiated from an object to be measured.

[0002]

2. Description of the Related Art Conventionally, a mercury thermometer has been used exclusively for measuring body temperature, but it took several minutes to reach a temperature equilibrium with the tissue at the contact portion. In recent years, it has been found that the eardrum has a unique temperature that is essentially equal to the internal temperature of the human body. In order to measure body temperature in a short time, a radiation thermometer has emerged by applying infrared sensor technology. An outline of the prior art will be described. (Not shown)

As a prior art, Japanese Patent Application Laid-Open No. 3-501820
The publication discloses the technique. Its main part is a heat conduction block (aluminum block) composed of a good conductor such as aluminum or copper. The heat conduction block (aluminum block) guides infrared rays radiated from the eardrum and most of the waveguide (light guide pipe). The infrared sensor continuously extends over an infrared detector (infrared sensor) for detecting the infrared rays so as to have a sufficient mass to keep the components in the infrared sensor unit substantially in an isothermal state. . In this way, each component in the infrared detection unit is set to “invisible” with respect to the infrared detector.

The outline of the prior art disclosed in JP-A-2-35322 is that a light guide tube (light guide pipe) and an infrared sensor are made of a lightweight metal housing (aluminum block) made of aluminum or the like and having good heat conductivity. ), A first temperature sensor for detecting the infrared sensor and its surrounding temperature and a second temperature sensor for detecting the surface temperature of the light guide tube are provided, and the temperature difference between these sensors is corrected. In addition to calculating body temperature data and prohibiting display of body temperature when the temperature difference measurement circuit determines the measurement limit temperature difference, it is possible to perform body temperature measurement without having to wait until the parts of the probe are completely in thermal balance. it can.

[0005]

However, the above-mentioned radiation thermometer has the following problems. That is, in JP-A-3-501820, a temperature difference actually occurs between the light guide pipe and the infrared sensor (optical system), for example, the vicinity of the entrance of the light guide pipe is heated during measurement. There was a problem that it might happen.

[0006] The tip of the probe of the radiation thermometer is:
The thickness of the light guide pipe is limited in order to make it thick enough to be inserted into the ear canal of an infant or the like. Under such a restriction, the portion of the infrared sensor becomes thicker than the portion of the light guide pipe, as in JP-A-2-35322 (two thermistors). If the infrared sensor was covered with an aluminum block or an adhesive with good thermal conductivity was provided at the bottom to increase the heat capacity so that the temperature would not change significantly, the light guide pipe was covered with an aluminum block. The heat capacity is larger in the part where the infrared sensor is covered with the aluminum block than in the part.

Generally, a radiation thermometer is left at a temperature lower than the body temperature. When a probe is inserted into the ear canal during measurement, the tip of the probe is heated by the ear canal.
Then, the temperature at the distal end side of the light guide pipe increases, so that a temperature distribution occurs in the light guide pipe and the aluminum block thermally coupled to the light guide pipe. If the heat capacity from the front end to the rear end of the light guide pipe is almost constant, this temperature distribution is expressed by a simple formula from high temperature to low temperature at the rear end, and high to low temperature during that time. The distribution is easy to approximate. However, when an infrared sensor having a large heat capacity is coupled to the back of the light guide pipe as in Japanese Patent Application Laid-Open No. 2-35322, the temperature tends to rise because the heat capacity is small at the tip end of the light guide pipe. On the other hand, the rear end side of the light guide pipe is thermally coupled to the infrared sensor having a large heat capacity and the temperature is unlikely to rise, so that the temperature from the front end to the rear end has a complicated temperature distribution that cannot be approximated by a simple equation, The temperature difference between them also increases. In addition, since the temperature distribution is not linear, the position indicating the temperature (effective temperature) representing the temperature of the light guide pipe changes depending on conditions such as the room temperature or the body temperature of the non-measured person, and the light guide pipe is not changed. The position indicating the effective value changes as time elapses after the tip of the is heated. Therefore, in Japanese Patent Application Laid-Open No. 2-35322, a thermistor for measuring the temperature of the light guide pipe is provided. However, the thermistor does not always indicate the temperature representative of the temperature of the light guide pipe, and is not accurate. There was a problem that temperature compensation could not be performed.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a radiation thermometer capable of more accurate temperature compensation even if the heat balance between the light guide means and the infrared sensor is lost. To provide.

[0009]

In order to achieve the above object, a radiation thermometer according to the present invention comprises an entrance through which infrared rays emitted from an object to be measured enter, and a radiation emitting infrared rays entering the entrance. A light guiding means having an opening, a high heat conductive member thermally coupled to the light guiding means, an infrared sensor provided opposite to the emitting opening and detecting infrared light emitted from the emitting opening, a reference First temperature measuring means for generating a temperature signal, second temperature measuring means for measuring the temperature of the light guide means,
Calculating means for calculating the temperature of the object to be measured based on the outputs of the infrared sensor, the first temperature measuring means and the second temperature measuring means, and a notifying means for notifying the calculation result of the calculating means. In the radiation thermometer provided, a heat insulating means for thermally insulating the light guide means and the high thermal conductive member from the infrared sensor is provided.

In addition, the heat insulating means is provided with a low heat conductive optical system connecting member for holding the light guide means and the infrared sensor at a predetermined distance so that the light guide means does not contact the infrared sensor. The high thermal conductivity member is arranged closer to the light guide means than to the light guide means end of the infrared sensor so as not to contact the infrared sensor.

Further, the light guide means is constituted by a pipe,
The heat capacity means has a hollow portion into which the pipe is inserted and a pipe fixing portion provided in the hollow portion fixed to the outer periphery of at least a part of the pipe, and the optical system connecting member includes A heat capacity means press-fitting portion is press-fitted on the inner or outer periphery of the cavity on the radiation port side, and an infrared sensor press-fitting portion is press-fitted on a side surface of the infrared sensor.

Further, the light guide means is constituted by a pipe,
The optical system connecting member has a pipe press-fitting portion press-fitted into the inner or outer circumference of the radiation port of the pipe, and an infrared sensor press-fitting portion pressed into a side surface of the infrared sensor. .

Further, the second temperature measuring means is a temperature sensor, and the high thermal conductive member covers the temperature sensor and holds the temperature sensor at or near the side surface of the pipe. It is characterized by having.

Further, the second temperature measuring means has a substantially same temperature state as that of the light guiding means and is closed so as not to receive infrared rays from the outside; And a temperature-sensitive sensor for measuring the temperature of the infrared sensor for temperature compensation.

Further, the radiation thermometer includes a case means for covering at least a periphery of a radiation opening of the pipe, and a coating film provided near the entrance of the pipe and for preventing reflection of infrared rays incident on the entrance of the pipe. And a hermetic means for hermetically sealing between the periphery of the window member surface and the case means.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A radiation thermometer according to the present invention will be described below with reference to the drawings. FIG. 1 is an external view of a radiation thermometer according to the first embodiment of the present invention. In FIG. 1, a radiation thermometer 1 has a measurement switch 3 and a display device 4 above a case means 2. A probe unit 5 having an inlet 6 is provided at the tip of the case means 2. The material of the case means 2 and the probe section 5 is, for example, an ABS resin or the like.

When the body temperature is measured by the radiation thermometer 1, after the measurement switch 3 is pressed, the tip of the probe unit 5 is inserted into the ear canal. The radiation thermometer 1 starts the measurement immediately after the measurement switch 3 is depressed, and from the start of the measurement until the end of the probe unit 5 is inserted into the ear canal and the measurement is completed under predetermined conditions. The temperature calculated using the output of the infrared sensor corresponding to the peak value among the infrared rays incident on the inlet 6 at the tip of the tip is displayed as the body temperature. Since the radiation thermometer 1 is usually left in a temperature environment lower than the body temperature, the temperature of the probe section 5 is substantially the same as this environmental temperature. Therefore, when the probe unit 5 is inserted into the ear canal, the temperature of the ear canal is cooled by the probe unit 5, so that the peak value is usually obtained during the process of inserting the tip of the probe unit 5 into the ear canal or immediately after the insertion. Radiated from the ear canal, probe part 5
It becomes a value corresponding to the infrared ray incident on the inlet 6 at the tip of.

FIG. 2 is a block diagram of the radiation thermometer shown in FIG. As shown in FIG. 2, the radiation thermometer 1 includes an optical system 25, a detection unit 26, an amplification unit 27, a calculation unit 28, and the display device 4.

The optical system 25 is a light guide pipe 1 which is a light guide means for efficiently condensing infrared radiation from the temperature measurement target L.
7 and a window member 15 having infrared transmittance.

The detector 26 includes an infrared sensor 18, a thermistor 20 as first temperature measuring means for detecting the temperature of the infrared sensor 18, and a second sensor for detecting the temperature of the light guide pipe 17.
Thermistor 19 is a temperature measuring means.
The first temperature measuring means uses an infrared sensor 18 as a reference temperature signal.
To generate a signal corresponding to the temperature.

The amplifier 27 amplifies the output voltage of the infrared sensor 18 and digitizes the output voltage.
And an amplifier 27b that amplifies and digitizes the output voltage of the thermistor 20, and an amplifier 27c that amplifies and digitizes the output voltage of the thermistor 19. The output voltages of the thermistors 19 and 20 are voltage drops when these are driven at a constant current.

The arithmetic unit 28 has an arithmetic circuit 28a. The arithmetic circuit 28a performs an operation to be described later based on signals from the infrared sensor 18, the thermistor 20, and the thermistor 19 to obtain the temperature measurement target L, ie, the eardrum and the ear canal. Is calculated and displayed on the display device 4.

Here, an outline of the principle of temperature compensation of the optical system will be described. If the light guide pipe 17 and the infrared sensor 18 have the same temperature, the infrared sensor 18 will
Can detect only infrared rays. This is because the heat radiation is also emitted from the light guide pipe 17, but since the temperature is the same as that of the infrared sensor 18, the heat radiation from the light guide pipe 17 is neglected in consideration of the difference between the incidence and the radiation at the infrared sensor 18. This is because it can be done. However, the light guide pipe 17
When a temperature difference is generated between the infrared sensor 18 and the infrared sensor 18, a difference occurs between the heat radiation of the light guide pipe 17 and the heat radiation of the infrared sensor 18. Heat radiation from the
Therefore, heat radiation from the light guide pipe 17 cannot be ignored. Therefore, the temperatures of the infrared sensor 18 and the light guide pipe 17 are measured by the thermistors 20 and 19, respectively.
The operation circuit 28a corrects the output from the infrared sensor 18 by a predetermined operation based on the temperature difference between these thermistors to obtain a more accurate body temperature.

In this embodiment, the body temperature measured by the radiation thermometer 1 is displayed on the display device 4.
The present invention is not limited to this. For example, a plurality of body temperatures may be displayed in a bar graph or a line graph, or the body temperature may be notified to a user by voice or the like, and various notification means may be used. .

FIG. 3 is a sectional view of the probe part of the radiation thermometer shown in FIG. As shown in FIG. 3, a window member 15 is provided at the inlet 6 at the tip of the probe unit 5. The material of the window member 15 is an infrared transparent optical crystal material, such as calcium fluoride, silicon, or barium fluoride.

The infrared rays incident from the window member 15 are guided by a light guide pipe 17 which is thermally connected and held by an aluminum block 16 which is a member having high thermal conductivity, and reaches an infrared sensor 18. As the infrared sensor 18, for example, a thermopile can be used. Also,
A light guide pipe 17 serving as a light guide means has an entrance 17a into which infrared rays are incident, and an entrance 17a opposed to the infrared sensor 18.
It has a radiation port 17b for radiating infrared rays incident from the surface, and is made of, for example, copper, brass, stainless steel, or the like, and its inner surface is mirror-finished and gold-plated to increase the reflectance. The light guide pipe 17 is inserted into a cylindrical cavity formed in the aluminum block 16, and is fixed by an adhesive at a pipe fixing portion 8a on the inner surface of the cavity.

In FIG. 3, reference numeral 19 denotes a thermistor, which is a second temperature measuring means for detecting the temperature of the light guide pipe 17, and is covered with an aluminum block 16 having good heat conductivity. Follow the temperature of 16. The inside of the holding portion 19c of the thermistor 19 is filled with an adhesive 19b having good thermal conductivity, and the thermistor 19 is fixed to the vicinity of the light guide pipe 17. The thermistor 19
Is a cavity formed obliquely with respect to the side surface of the light guide pipe 17, and by forming the cavity in this manner, the thermistor 19 becomes an aluminum block 1
Covered with 6. Aluminum can be easily formed into a complicated shape by aluminum die casting.

The probe case 5a constituting the probe section 5 is made of ABS resin having poor heat conductivity.
Further, by providing a cavity 21 between the aluminum block 16 and the aluminum block 16, external heat is generated.
It is hard to be transmitted to. The inner circumference of the probe case 5a and the outer circumference of the aluminum block 16 are connected to the probe case 5a.
And is supported by an aluminum block supporting portion 31 formed at the bottom. Reference numeral 20 denotes a thermistor, which is a first temperature measuring element for detecting the temperature of the infrared sensor 18, and is fixed to the back side of the infrared sensor 18 by an adhesive 20b having good heat conductivity as described later.

Although the second temperature measuring means is fixed to the back side of the infrared sensor 18, it may be built in the package of the infrared sensor 18.

In FIG. 3, 18a and 18b are output terminals of the infrared sensor 18, 19a is an output terminal of the thermistor 19, and 20a is an output terminal of the thermistor 20.

As a feature of the present invention, as a heat insulating means for thermally insulating the light guide pipe 17 and the aluminum block 16 from the infrared sensor 18, a low heat conductive optical connecting member 30 made of, for example, polyethylene plastic is used.
The end face of the light guide pipe 17 on the radiation port 17b side is held at a predetermined distance d so that the infrared sensor 18 does not come into direct contact with the infrared sensor 18.
The aluminum block 16 is disposed so as not to contact the infrared sensor 18 and closer to the light guide pipe 17 than the end of the infrared sensor 18 on the light guide pipe 17 side, so that the aluminum block 16 does not affect the infrared sensor 18. Thermal insulation is performed by taking into account the following.

If the aluminum block 16 is surrounded so as to cover the side surface of the infrared sensor 18, even if the aluminum block 16 and the infrared sensor 18 are not in direct contact with each other, thermal effects are caused to each other. . In this manner, the heat insulation effect is further enhanced by preventing the aluminum block 16 from surrounding the side surface of the infrared sensor 18.

The optical system connecting member 30 can be more stably held by using an acetal resin such as POM (polyoxymethylene) in consideration of creep resistance and fatigue resistance.

The optical system connecting member 30 includes the light guide pipe 1
7 and the sensor press-fitting portion 30b are hermetically pressed into the outer periphery of the radiating opening 17b and the sensor press-fitting portion 30b of the infrared sensor 18 so as to be in close contact with the entire circumference.
The light guide pipe 17 is prevented from entering the light guide pipe 17 from the 7b side, thereby preventing the gold plating on the inner surface from corroding and lowering the reflectance.
In FIG. 3, the optical system connecting member 30 is a light guide pipe 17.
Of the light guide pipe 17,
Press-fitting may be performed at the inner peripheral portion near a. In the case of press-fitting at the inner peripheral portion, if a mirror surface is formed on the inner periphery of the optical system connecting member 30, the reflectance does not decrease due to the optical system connecting member 30.

The thermistor 20 of the optical system connecting member 30
In order to improve the heat transfer between the thermistor 20 and the infrared sensor 18, an adhesive material 20 b having good thermal conductivity is embedded over the entire back side of the infrared sensor 18 so as to surround the thermistor 20. .

Further, a plastic infrared sensor support ring 32 is mounted on the back surface so that the adhesive 20b does not come out. The plastic sensor frame 33 covers the infrared sensor support ring 32 and the optical system connecting member 30, and Middle frame 33
Are locked to the optical system connecting member 30 by the fitting claws 33a.

FIGS. 4 and 5 are enlarged sectional views of the distal end of the probe part of the radiation thermometer according to the first embodiment of the present invention. As shown in FIG. 4, the gap between the probe case 5a and the window holding member 22 is waterproofed and sealed by a first packing 23a, and the gap between the window holding member 22 and the light guide pipe 17 is a second packing. 23b is waterproof and sealed.

The material of the window holding member 22 is, for example, copper, and has a first packing 23a and a second packing 23b.
Is an elastic member, for example, rubber. Further, the light guide pipe 17 and the window holding member 22 have, for example, a cylindrical shape, and the window member 15 covering the periphery of the entrance 17a of the light guide pipe 17 has a disk shape, and the material is, as described above, For example, calcium fluoride, silicon or barium fluoride is used. The first packing 23a and the second packing 23b are rubber-ring-shaped O-rings.

A coating film 15a for preventing reflection of infrared rays, for example, ZnS
A film and a Ge film are formed. Further coating film 15
The epoxy resin 15b is applied in a ring shape to the press contact surface between the window member 15 having the a and the window holding member 22.
Water is prevented from gradually entering between the coating film 15a and the window member 15. If the epoxy resin 15b is not applied, there is a problem that the adhesion of the coating film 15a is deteriorated due to the invasion of moisture, and the effect of preventing reflection of infrared rays is deteriorated, so that accurate measurement of the body temperature becomes impossible.

FIG. 5 shows that an O-ring shaped third packing 23c is provided on the pressure contact surface between the window member 15 and the window holding member 22 on which a coating film is formed, instead of applying an epoxy resin.
Waterproof and sealed. First and second packing 2
The waterproof structure using 3a and 23b is shown in FIG.
Same as (a). By using the third packing 23c, the window member 15 does not break even if the window member 15 is sandwiched and pressed strongly.

FIG. 6 is a sectional view of a probe part of a radiation thermometer according to the second embodiment of the present invention. As shown in FIG. 6, the infrared sensor 18 has a first infrared sensor 18A and a second infrared sensor 18B, and the first infrared sensor 18A It is a sensor that detects infrared rays.
7 also detects infrared radiation emitted from itself. On the other hand, the second infrared sensor 18B, which is a temperature compensation infrared sensor, is radiated from the reference cavity 9 itself under substantially the same temperature conditions as the light guide pipe 17 because the tip of the reference cavity 9 is closed. Detects only infrared light. Further, the second infrared sensor 18B is provided close to the first infrared sensor 18A so as to have substantially the same temperature as the first infrared sensor 18A. The thermistor 20 is a sensor that measures the temperatures of the first infrared sensor 18A and the second infrared sensor 18B. As described above, the thermistor 20 is the first
On the bottom surface of the infrared sensor 18A or the second infrared sensor 19B. By providing the reference cavity and the second infrared sensor in this manner, the second infrared sensor in the first embodiment described above is provided.
The thermistor, which is a temperature measuring element, becomes unnecessary.

The aluminum block 16, which is a heat capacity means,
It has a cavity into which the light guide pipe 17 is inserted. Then, by inserting the light guide pipe 17 into this hollow portion,
A reference cavity 9 is formed in a part thereof. A pipe fixing portion 16a is provided in the hollow portion of the aluminum block 16 on the side of the entrance 17a of the light guide pipe 17, and the outer periphery of at least a part of the light guide pipe 17 is hermetically fixed with an adhesive. Further, the aluminum block 16 includes a light guide pipe 17.
Has an optical system connecting member press-fitting portion 8b on the side of the radiation port 17b. The optical system connecting member 30 hermetically press-fits the aluminum block press-fitting portion 30c into the optical system connecting member press-fitting portion 8b of the aluminum block 16 and hermetically press-fits the sensor press-fitting portion 30b into the side surface of the infrared sensor 18. Also in the first embodiment, the aluminum block 1 is fixed by the pipe fixing portion 16a.
6 to the light guide pipe 17 in an airtight manner, and the optical system connecting member 3
0 may be airtightly pressed into the inner or outer circumference of the aluminum block 16 without being pressed into the light guide pipe 17.

Further, the end face of the light guide pipe 17 on the side of the radiation port 17b, the aluminum block 16 and the infrared sensor 18 do not directly contact each other. By thermally insulating the light guide pipe 17 and the infrared sensor 18 in this manner, even if heat is applied to the light guide pipe 17 and the aluminum block 16 and the equilibrium state of the temperature distribution is broken, the infrared light is applied to the light guide pipe 17. There is also an effect that the transition from the transient state to the equilibrium state occurs faster than when the sensor 18 is thermally coupled. The other configuration is the same as that of the first embodiment, and the description is omitted.

FIG. 7 is a block diagram for explaining the operation of the radiation thermometer shown in FIG. In this radiation thermometer, a second infrared sensor 18B is provided, and infrared light from the reference cavity 9 under substantially the same temperature conditions as the light guide pipe 17 is detected by the second infrared sensor 18B. By subtracting the output of the second infrared sensor 18B at an appropriate ratio from the output of the first infrared sensor 18A,
The configuration is such that infrared rays from a temperature measurement target can be detected without being affected by the temperature of the light guide pipe 17. The amplifier 27a amplifies and digitizes the output voltage of the second infrared sensor 18B, and the amplifier 27b amplifies and digitizes the output voltage of the thermistor 20.
Is for amplifying and digitizing the output voltage of the first infrared sensor 18A. The calculation means 28a performs a predetermined calculation based on signals from the first infrared sensor 18A, the second infrared sensor 18B, and the thermistor 20 to calculate a temperature measurement target, that is, the temperature of the eardrum and the ear canal. indicate.

Although the present embodiment has been described using a radiation thermometer, the present invention is not limited to this, and is also applicable to a radiation thermometer that measures the temperature of an object by infrared rays emitted from an object other than the human body. You can do it.

[0046]

As is apparent from the above description,
According to the present invention, the temperature distribution from the front end to the rear end of the light guide can be approximated to a simpler expression by thermally insulating and separating the light guide and the infrared sensor according to the first aspect. And the temperature difference between them becomes smaller,
The change in the position of the light guide that indicates the temperature representative of the temperature of the light guide is reduced. Therefore, it is possible to provide a radiation thermometer capable of more accurately compensating the temperature of the light guide.

According to the second aspect, the light guide means and the infrared sensor can be positioned and thermally insulated, and the high heat conductive member does not cover the side surface of the infrared sensor. Can be insulated.

According to the third aspect, the radiation port side of the light guide pipe can be made airtight, and the gold plating of the light guide pipe does not corrode. Further, since the light guide pipe is press-fitted into the optical system connecting member, assembly is easier than in a case where the light guide pipe is fixed with an adhesive.

According to the fourth aspect, the radiation port side of the light guide pipe can be made airtight, and the gold plating of the light guide pipe does not corrode. Water does not accumulate in the light guide pipe by absorbing water like an adhesive.

According to the fifth aspect, since the thermal conductivity is covered with the same member, the temperature-sensitive sensor can easily follow the substantially same temperature as the high thermal conductive member.

According to the present invention, by providing a temperature compensating infrared sensor for detecting infrared rays from the reference cavity, the effective value of the pipe temperature can be obtained more accurately.

According to the seventh aspect of the present invention, the coating film is formed on the surface of the window member and the coating film is prevented from peeling off, so that the reflection of infrared light incident on the entrance of the light guide pipe is more reliably prevented. .

As described above, according to the configuration of the present invention,
A radiation thermometer capable of more accurately compensating the temperature of the optical system even if the heat balance between the light guide means and the infrared sensor is lost can be provided.

[Brief description of the drawings]

FIG. 1 is an external view of a radiation thermometer according to a first embodiment of the present invention.

FIG. 2 is a block diagram of the radiation thermometer shown in FIG. 1;

FIG. 3 is a sectional view of a probe section of the radiation thermometer shown in FIG. 1;

FIG. 4 is an enlarged cross-sectional view of a distal end portion of the probe section shown in FIG.

5 is a cross-sectional view showing another waterproof structure near the window holding member at the tip of the probe unit of the radiation thermometer shown in FIG.

FIG. 6 is a cross-sectional view of a probe part of a radiation thermometer according to a second embodiment of the present invention.

FIG. 7 is a block diagram of the radiation thermometer shown in FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Radiation thermometer 2 Case means 3 Measurement switch 4 Display device 5 Probe part 6 Inlet 9 Reference cavity 15 Window member 15a Coating film 15b Epoxy resin (airtight means) 16 Aluminum block 17 Light guide pipe 17a Inlet 17b Radiator 18 Infrared sensor 18a, 18b, 19a, 20a Output terminal 18A First infrared sensor 18B Second infrared sensor 19, 20 Thermistor 19b, 20b Adhesive 22 Window holding member 23a First packing 23b Second packing 23c Third packing 25 Optical system 26 Detecting unit 27 Amplifier 28 Operation unit 30 Optical system connecting member 30a Pipe press-in unit 30b Sensor press-in unit d Distance between light guide pipe radiation port tip and infrared sensor

Claims (7)

[Claims] 1. A light guide having an entrance through which infrared rays emitted from a temperature measuring object are incident, a radiation outlet through which infrared rays are incident on the entrance, and high heat thermally coupled to the light guide. A conductive member, and an infrared sensor provided to face the radiation port and detecting infrared radiation radiated from the radiation port,
First temperature measuring means for generating a reference temperature signal, second temperature measuring means for measuring the temperature of the light guide means, the infrared sensor, the first temperature measuring means, and the second temperature measuring means And a notifying unit for notifying the calculation result of the calculating unit, based on the output of the light guide unit and the high thermal conductivity member. A radiation thermometer provided with heat insulating means for thermally insulating an infrared sensor. 2. The heat insulating means is provided with a low heat conductive optical system connecting member for holding the light guide means and the infrared sensor at a predetermined distance so that the light guide means and the infrared sensor do not come into contact with each other. 2. The structure according to claim 1, wherein the high thermal conductivity member is arranged closer to the light guide than an end of the infrared sensor closer to the light guide so as not to contact the infrared sensor. Radiation thermometer. 3. The light guide means is constituted by a pipe, and the heat capacity means includes a hollow portion into which the pipe is inserted, and a pipe fixing portion provided in the hollow portion fixed to an outer periphery of at least a part of the pipe. Having the optical system connecting member,
The radiation according to claim 1, further comprising: a heat-capacity unit press-fit portion press-fitted into the inner or outer periphery of the hollow portion of the heat-capacity unit; and an infrared sensor press-fit portion press-fit into a side surface of the infrared sensor. 4. thermometer. 4. The light guide means is formed of a pipe, and the optical system connecting member is press-fitted into a pipe press-fitting portion press-fitted into an inner or outer circumference of a radiation port of the pipe and a side face of the infrared sensor. The radiation thermometer according to claim 1, further comprising an infrared sensor press-fit portion. 5. The second temperature measuring means is a temperature sensor, and the high thermal conductive member covers the temperature sensor and holds the temperature sensor on the side surface or near the side surface of the pipe. The radiation thermometer according to any one of claims 1 to 4, further comprising: 6. The second temperature measuring means has substantially the same temperature state as that of the light guiding means, and is closed so as not to receive infrared light from the outside. The radiation thermometer according to any one of claims 1 to 3, comprising a temperature compensation infrared sensor for measuring a temperature, and a temperature sensor for measuring the temperature of the temperature compensation infrared sensor. 7. A radiation thermometer comprising: a case means for covering at least a periphery of a radiation opening of a pipe; and a coating film provided near an entrance of the pipe and for preventing reflection of infrared light incident on the entrance of the pipe. The radiation temperature according to any one of claims 1 to 6, further comprising: a window member having at least one surface thereof, and airtight means for airtight between a periphery of the surface of the window member and the case means. Total.