CN212567693U - Infrared thermometer - Google Patents
Infrared thermometer Download PDFInfo
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- CN212567693U CN212567693U CN202021966216.0U CN202021966216U CN212567693U CN 212567693 U CN212567693 U CN 212567693U CN 202021966216 U CN202021966216 U CN 202021966216U CN 212567693 U CN212567693 U CN 212567693U
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Abstract
The utility model relates to an infrared thermometer, including casing and infrared thermopile sensor, be equipped with temperature measurement window on the casing, still include inlet channel, return air passageway and hollow constant temperature cavity, the constant temperature cavity is located in the casing and is corresponded the setting with temperature measurement window, infrared thermopile sensor sets up in the constant temperature cavity, be equipped with air inlet and return air mouth on the chamber wall of constant temperature cavity respectively, inlet channel and return air passageway are located the casing respectively and are located outside the constant temperature cavity, on inlet channel's one end is located the air inlet, on the return air mouth is located to return air passageway's one end, form one-way air current circulation between inlet channel's the other end and the other end of return air passageway. The infrared thermometer can reduce or eliminate the influence of factors such as low-temperature environment on the thermometer, and is suitable for low-temperature environment conditions.
Description
Technical Field
The utility model relates to a body temperature check out test set, in particular to infrared thermometer.
Background
Body temperature detection is a key point for prevention and control of new coronary pneumonia epidemic situation, and the current infrared temperature measurement products generally require the use environment temperature to be 16-35 ℃. For winter with low temperature, most epidemic prevention and control monitoring points are outdoors, and the instrument is easy to have serious deviation and even can not display because of long-time outdoor use.
At present, an infrared sensor commonly used by an infrared thermometer is a thermopile infrared sensor, the technology is mature, and the cost is moderate. The environmental temperature is one of the main variables of the infrared-body temperature calculation formula of the sensor, and the environmental temperature has certain requirements on the used environmental temperature, and generally needs to be within the range of 16-35 ℃.
The influence of the ambient temperature is the influence on the temperature of the thermopile sensor, and the purpose of placing the temperature measuring instrument for a period of time under a specific environment for reuse is to balance the temperature of the sensor and the ambient temperature. This temperature is measured by a thermistor built in the thermopile sensor, and then transmitted to the infrared sensor to correct the ambient temperature.
Meanwhile, the thermopile sensor is also easily polluted by external heat radiation, such as the body temperature of an operator, the radiation heat source of other or measured objects, the environmental temperature fluctuation and the like, so that the measured temperature drifts. These factors make the infrared thermometer unsuitable for use in low temperature environments.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: the infrared thermometer can eliminate the influence of environment temperature and other non-relevant heat radiation on the infrared thermopile sensor, and is suitable for low temperature environment.
In order to solve the technical problem, the utility model discloses a technical scheme be:
the utility model provides an infrared thermometer, includes casing and infrared thermopile sensor, be equipped with the temperature measurement window on the casing, still include inlet channel, return air passageway and hollow constant temperature cavity, the constant temperature cavity is located in the casing and is corresponded the setting with the temperature measurement window, infrared thermopile sensor sets up in constant temperature cavity, be equipped with air inlet and return-air mouth on the chamber wall of constant temperature cavity respectively, inlet channel and return-air passageway are located the casing respectively and are located outside the constant temperature cavity, inlet channel's one end is located on the air inlet, return-air channel's one end is located on the return-air mouth, form one-way air current circulation between inlet channel's the other end and the return-air channel's the other end.
The beneficial effects of the utility model reside in that:
through the design of the constant temperature cavity, the infrared thermopile sensor is arranged in the constant temperature cavity, the constant temperature of the infrared thermopile sensor is controlled (controlled at 25 ℃) through the constant temperature cavity, the influence of factors such as a low temperature environment on the temperature measuring instrument is reduced or eliminated, and the infrared temperature measuring instrument is further suitable for the low temperature environment.
Drawings
Fig. 1 is a schematic view of the connection of the whole structure of the infrared thermometer according to the embodiment of the present invention.
Description of reference numerals:
1. a housing; 2. an infrared thermopile sensor; 3. an air intake passage; 4. a gas return channel; 5. a constant temperature cavity; 6. a temperature control unit; 7. a heating element; 8. a thermistor; 9. a heat collector; 10. a signal amplifier; 11. a processor; 12. a temperature sensor; 13. an air filter; 14. a fan; 15. a temperature measuring window; 16. an optical filter; 17. and a gas supply channel.
Detailed Description
In order to explain the technical content, the objects and the effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
The utility model discloses the most crucial design lies in: the infrared thermopile sensor is arranged in the constant temperature cavity and provides a simplified infrared radiation-body temperature algorithm without correcting the environmental temperature.
Referring to fig. 1, an infrared thermometer includes a housing and an infrared thermopile sensor, the housing is provided with a temperature measurement window, and further includes an air inlet channel, an air return channel, and a hollow constant temperature cavity, the constant temperature cavity is disposed in the housing and is corresponding to the temperature measurement window, the infrared thermopile sensor is disposed in the constant temperature cavity, the wall of the constant temperature cavity is respectively provided with an air inlet and an air return port, the air inlet channel and the air return channel are respectively disposed in the housing and located outside the constant temperature cavity, one end of the air inlet channel is disposed on the air inlet, one end of the air return channel is disposed on the air return port, and a unidirectional airflow circulation is formed between the other end of the air inlet channel and the other end of the air return.
From the above description, the beneficial effects of the present invention are:
through the design of the constant temperature cavity, the infrared thermopile sensor is arranged in the constant temperature cavity, the constant temperature of the infrared thermopile sensor is controlled (controlled at 25 ℃) through the constant temperature cavity, the influence of factors such as low temperature environment on the temperature measuring instrument is reduced or eliminated, the environmental temperature parameter of the sensor does not need to be corrected, the stability and the applicability of the device are improved, and the infrared temperature measuring instrument is further suitable for the low temperature environment.
Furthermore, the air-conditioning device also comprises a temperature control unit and a heating element, wherein the temperature control unit is electrically connected with the heating element, and the heating element is arranged on the air inlet channel.
As can be seen from the above description, as a specific example of the structure of the thermostatic control, the temperature control unit and the heating element may be designed, air in the air inlet channel flows through the heating element, the temperature control unit controls the heating element to heat the passing air, the air heated to the required temperature flows into the thermostatic chamber from the air inlet, and then flows into the air return channel through the air return opening, so as to form a unidirectional air flow circulation, and the thermostatic chamber and the temperature control unit form a circulation, so as to ensure that the temperature in the chamber is stably controlled at the required temperature (25 ℃).
The constant-temperature cavity is characterized by further comprising a thermistor, a heat collector, a signal amplifier and a processor, wherein the thermistor and the heat collector are respectively arranged in the constant-temperature cavity, the thermistor is arranged on an attachment bottom plate of the heat collector and is close to the heat collector, and the thermistor is electrically connected with the temperature control unit; the signal amplifier and the processor are respectively arranged in the shell and positioned outside the constant-temperature cavity, and the heat collector is electrically connected with the processor through the signal amplifier.
Furthermore, the temperature sensor is arranged on the outer side of the shell and electrically connected with the processor.
As can be seen from the above description, as a specific structural example, the thermistor is disposed on the attachment bottom plate of the heat collector at a position as close as possible to the heat collector, and is used for monitoring the ambient temperature in the thermostatic chamber and feeding back to the temperature control unit. The heat collector transfers the received infrared radiation energy to the processor for processing after the A/D conversion of the infrared radiation energy is carried out by the signal amplifier. And the temperature sensor is arranged on the outer side of the shell and used for measuring the actual environment temperature of the measured human body and transmitting the measured environment temperature to the singlechip for processing.
Further, the processor is a single chip microcomputer.
As can be seen from the above description, as a specific structural example, the processor is a single chip microcomputer.
Furthermore, the constant temperature cavity is made of a heat insulating material.
As can be seen from the above description, as a specific structural example, the constant temperature chamber is made of a heat insulating material to avoid heat exchange with the outside.
Further, still include air cleaner, air cleaner locates on the air intake passage, air cleaner and heating element set gradually along the direction of admitting air.
As can be seen from the above description, as a specific structural example, an air filter may be added to filter out dust in the air so that the dust meets a certain cleanliness requirement and then enters the constant temperature chamber.
The air outlet of the fan is connected with the other end of the air inlet channel, the other end of the air return channel is connected with the air return inlet of the fan, and one-way airflow circulation is formed through the fan.
Furthermore, an air supply channel is arranged on the fan, and a valve is arranged on the air supply channel.
As can be seen from the above description, as a specific structural example, the fan may be designed to realize a unidirectional airflow circulation. The air supply channel is used for compensating the leakage air quantity of the whole air flow circulating system.
Furthermore, an optical filter is arranged on the cavity wall of the constant temperature cavity, and the optical filter is arranged corresponding to the temperature measurement window.
In practical application, the influence of the environmental temperature on the infrared thermometer comprises two parts, namely the influence on the temperature sensing performance of the infrared sensor and the influence on the infrared radiation of the surface of a measured human body.
The suitable temperature of the infrared thermopile sensor is 16 ℃ to 35 ℃, preferably 25 ℃. Therefore, the temperature of the thermostatic chamber is controlled to be stabilized at 25 ℃ +/-0.3 ℃ by the temperature control unit. The parameters of the thermistor have higher stability at 25 ℃, and only the nominal value of the thermistor at 25 ℃ needs to be corrected. The utility model discloses an infrared thermometer, the design is with the temperature control of infrared thermopile sensor itself at 25 ℃, further adopts the standard black body, marks under different ambient temperature, obtains the influence of different ambient temperature to being surveyed the black body, carries out the polynomial fitting to the output curve of sensor and obtains corresponding correction coefficient, need not compensate ambient temperature again. Further, combining Planck's law, the temperature is TobjThe radiation power per unit area at all wavelengths of the object of (a) can be expressed as: pobj＝kεTobj；
Wherein: k is the Boltzmann constant,. epsilon.is the emission coefficient of the object,. epsilon.E [0, 1 ].
Sensitivity coefficient beta of infrared thermopile sensor at 25 deg.c25Which is determined by the sensitivity of the sensor itself at 25 c, is a constant.
The coefficient of the fitting curve of the influence of the environmental temperature of the measured human body on the measurement result of the sensor is expressed as deltaenThe coefficient may be combined with the ambient temperature T measured by the thermocouple sensor at the housingenAnd fitting a curve to obtain. The influence function relationship of the coefficient can be predetermined by placing a standard black body in an environment test box and carrying out a series of environment temperature experiments.
Therefore, in the design, the output voltage of the infrared thermopile sensor can be simplified into the relation between the radiation temperature of the measured human body and the ambient temperature: u ═ beta25δenPobj＝β25δenkεTobj＝φ(Ten)Tobj. Phi is a function of the ambient temperature.
Referring to fig. 1, a first embodiment of the present invention is:
the infrared thermometer of this embodiment is infrared forehead temperature rifle, including casing 1, infrared thermopile sensor 2, inlet channel 3, return-air passageway 4, constant temperature cavity 5, temperature control unit 6, heating element 7, thermistor 8, heat collector 9, signal amplifier 10, treater 11, temperature sensor 12, air cleaner 13 and fan 14, and the treater of this embodiment is the singlechip, and the temperature sensor of this embodiment selects thermocouple temperature sensor.
The temperature measurement device is characterized in that a temperature measurement window 15 is arranged on the shell 1, the air inlet channel 3, the air return channel 4, the constant temperature cavity 5, the temperature control unit 6, the heating element 7, the signal amplifier 10, the processor 11, the air filter 13 and the fan 14 are all arranged in the shell 1, an optical filter 16 is arranged on the cavity wall of the constant temperature cavity 5, and the optical filter 16 is arranged corresponding to the temperature measurement window 15.
The embodiment provides a constant temperature environment for the infrared thermopile sensor, and air gets out from the air outlet of fan 14 and gets into air cleaner 13, filters the dust in the air and makes it satisfy certain cleanliness requirement after, gets into temperature control unit 6, and temperature control unit 6 control heating element 7 heats the air that passes through, under the regulation and control of heating element 7 and temperature control unit 6, makes the air that gets into invariable at 25 ℃ ± 0.3 ℃, then gets into in the constant temperature cavity 5 that the infrared thermopile sensor is located, and the back forms the closed loop through air return opening mass flow circulation return fan 14.
The thermistor 8 is arranged on the attachment bottom plate of the heat collector 9 and is close to the heat collector 9 as much as possible, and is used for monitoring the ambient temperature in the constant temperature cavity 5 and feeding back the ambient temperature to the temperature control unit 6.
The heat collector 9 transfers the received infrared radiation energy to the singlechip for processing after A/D conversion.
A (thermocouple) temperature sensor 12 is arranged on the shell 1 and used for measuring the actual ambient temperature of the human body to be measured and transmitting the measured ambient temperature to the single chip microcomputer for processing.
The fan 14 is also provided with an air supply channel 17, and the air supply channel 17 can be provided with a valve as required to compensate the air leakage of the system.
The constant temperature cavity 5 is packaged by a heat insulating material, so that heat exchange with the outside is avoided.
The processor 11 selects the singlechip, can perform control operation through keys on the singlechip, and can perform body temperature display through the singlechip.
The air inlet channel 3, the air return channel 4, the constant temperature cavity 5, the temperature control unit 6, the heating element 7, the signal amplifier 10, the processor 11, the air filter 13 and the fan 14 can be fixed in the casing 1 by adopting the existing fixing mode, and the infrared thermopile sensor 2 can be fixed in the constant temperature cavity 5 by adopting the existing fixing mode, which is not described in detail herein.
The embodiment provides a stable, constant-temperature and clean operating environment for the infrared thermopile sensor, overcomes the influence of the ambient temperature on the infrared thermopile sensor, enables the infrared thermometer to be used at a lower ambient temperature, and keeps higher stability and accuracy.
Simultaneously combines the sensitivity coefficient beta of an infrared thermopile sensor at 25 DEG C25And the influence coefficient delta of the ambient temperature on the surface temperature radiation of the human bodyenObtaining the output characteristic formula of phi (T)en)Tobj；
The utility model discloses a design has great meaning to the service environment condition who extends infrared radiation thermometer, the stability and the accuracy that improve the temperature measurement.
To sum up, the utility model provides an infrared radiation thermometer can reduce or eliminate the influence of factors such as low temperature environment to the thermoscope, is applicable to low temperature environment.
The above mentioned is only the embodiment of the present invention, and not the limitation of the patent scope of the present invention, all the equivalent transformations made by the contents of the specification and the drawings, or the direct or indirect application in the related technical field, are included in the patent protection scope of the present invention.
Claims (10)
1. The utility model provides an infrared thermometer, includes casing and infrared thermopile sensor, be equipped with the temperature measurement window on the casing, its characterized in that still includes inlet channel, return air passageway and hollow constant temperature cavity, the constant temperature cavity is located in the casing and is corresponded the setting with the temperature measurement window, infrared thermopile sensor sets up in the constant temperature cavity, be equipped with air inlet and return air mouth on the chamber wall of constant temperature cavity respectively, inlet channel and return air passageway are located the casing respectively and are located outside the constant temperature cavity, inlet channel's one end is located on the air inlet, return air passageway's one end is located on the return air mouth, form one-way air current circulation between inlet channel's the other end and the other end of return air passageway.
2. The infrared thermometer of claim 1 further comprising a temperature control unit and a heating element, said temperature control unit being electrically connected to the heating element, said heating element being disposed on the air intake passage.
3. The infrared thermometer according to claim 2, further comprising a thermistor, a heat collector, a signal amplifier and a processor, wherein the thermistor and the heat collector are respectively disposed in the thermostatic chamber, the thermistor is disposed on an attachment bottom plate of the heat collector and is disposed close to the heat collector, and the thermistor is point-connected to the temperature control unit; the signal amplifier and the processor are respectively arranged in the shell and positioned outside the constant-temperature cavity, and the heat collector is electrically connected with the processor through the signal amplifier.
4. The infrared thermometer of claim 3 further comprising a temperature sensor disposed outside the housing and electrically connected to the processor.
5. The infrared thermometer of claim 3 wherein said processor is a single chip.
6. The infrared thermometer of claim 1, wherein said thermostatic chamber is made of a heat insulating material.
7. The infrared thermometer of claim 1 further comprising an air filter disposed on the air intake passage, the air filter and the heating element being arranged in series along the air intake direction.
8. The infrared thermometer of claim 1, further comprising a fan, wherein an air outlet of the fan is connected to the other end of the air inlet channel, and the other end of the air return channel is connected to an air return inlet of the fan, so that a unidirectional air flow circulation is formed by the fan.
9. The infrared thermometer of claim 8, wherein said blower is provided with an air supply channel, said air supply channel being provided with a valve.
10. The infrared thermometer according to claim 1, wherein an optical filter is disposed on the wall of the constant temperature chamber, and the optical filter is disposed corresponding to the temperature measurement window.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021966216.0U CN212567693U (en) | 2020-09-10 | 2020-09-10 | Infrared thermometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021966216.0U CN212567693U (en) | 2020-09-10 | 2020-09-10 | Infrared thermometer |
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| Publication Number | Publication Date |
|---|---|
| CN212567693U true CN212567693U (en) | 2021-02-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021966216.0U Active CN212567693U (en) | 2020-09-10 | 2020-09-10 | Infrared thermometer |
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| CN (1) | CN212567693U (en) |
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- 2020-09-10 CN CN202021966216.0U patent/CN212567693U/en active Active
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