High-precision infrared thermometer

Abstract

The utility model relates to the technical field of laser detection, in particular to a high-precision infrared thermometer. According to the high-precision infrared thermometer, the independent and stable constant-temperature space is independently designed for the infrared thermometer, and the temperature of the semiconductor chilling plate is controlled by the temperature control instrument according to the temperature radiation target surface in the constant-temperature device, so that the temperature of the constant-temperature space is controlled, and the voltage is adjusted according to the external environment temperature; the temperature in the constant-temperature space of the constant-temperature device is kept in a set range and is not influenced by external environment temperature fluctuation, and the temperature is stably output, so that high-precision measurement is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of laser detection, in particular to a high-precision infrared thermometer. Background Art

[0002] The traditional infrared thermometer architecture is composed of optical system, photodetector, signal amplifier and signal processing, display output and other parts. The optical system gathers the infrared radiation energy of the target in its field of view, and the infrared energy is focused on the photodetector and converted into a corresponding electrical signal. The signal passes through the amplifier and signal processing circuit, and is processed by the processor's unique algorithm and corrected with the target emissivity, plus the ambient temperature compensation to convert it into the temperature value of the measured target. The measurement accuracy of the infrared thermometer will be affected by the ambient temperature of the temperature measurement. The industry standard and national metrology standard of the thermometer are: to ensure the measurement accuracy, it must be used in an environment with an ambient temperature of (18-25) degrees Celsius. Other environments cannot be guaranteed. Even if it is used at this ambient temperature, ambient temperature fluctuations will cause temperature drift and fail to achieve high-precision measurement. Utility Model Content

[0003] The utility model aims to provide an infrared thermometer with a simple structure and capable of realizing accurate measurement, in view of the problem of low measurement accuracy in the prior art.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is as follows.

[0005] A high-precision infrared thermometer comprises a constant temperature device and a thermometer body in the constant temperature device, wherein the constant temperature device comprises a heat preservation cavity, a semiconductor refrigeration plate, a temperature radiation target surface, a temperature control instrument, a casing, and a power supply, wherein the temperature radiation target surface is located on the inner wall of the heat preservation cavity, the semiconductor refrigeration plate is installed close to the outer side of the temperature radiation target surface, and the temperature control instrument is used to control the temperature of the semiconductor refrigeration plate according to the temperature of the temperature radiation target surface, and control the temperature of the temperature radiation target surface by the temperature change of the semiconductor refrigeration plate, thereby controlling the temperature in the heat preservation cavity to be constant within a set temperature range.

[0006] As a further technical solution, the temperature control instrument includes a first temperature sensor and a second temperature sensor. The first temperature sensor is connected to the temperature radiation target surface and is used to detect the temperature of the temperature radiation target surface. The second temperature sensor is used to detect the ambient temperature. The temperature control instrument controls the forward and reverse voltages of the MOS tube according to the difference between the set temperature value and the detected ambient temperature value to cool or heat the cold surface of the semiconductor refrigeration plate and transfer the heat to the temperature radiation target surface.

[0007] As a further technical solution, the temperature control instrument adjusts the voltage according to the difference between the set temperature value and the detected target surface temperature value, so that the temperature of the temperature radiation target surface is maintained within the set temperature range.

[0008] As a further technical solution, the side wall of the heat-insulating cavity is provided with heat-insulating cotton, and the probe of the thermometer body passes through the heat-insulating cotton and communicates with the external environment.

[0009] As a further technical solution, a heat dissipation device is also included, which includes a radiator and a fan. The radiator is located on the outside of the semiconductor refrigeration plate, and the fan is located on the inner wall of the casing.

[0010] As a further technical solution, the high-precision thermometer includes two parts, the thermometer body, the constant temperature device and the heat dissipation device are located in the upper part, and the temperature control instrument and the switching power supply are located in the lower part.

[0011] As a further technical solution, a handle is also included, and the handle is arranged on the upper side of the casing.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] The high-precision infrared thermometer of the utility model is designed with an independent and stable constant temperature space for the infrared thermometer, and the temperature of the semiconductor refrigeration plate is controlled by a temperature control instrument according to the temperature radiation target surface in the constant temperature device, thereby controlling the temperature of the constant temperature space, and adjusting the voltage according to the external ambient temperature, so that the temperature in the constant temperature space of the constant temperature device is maintained within a set range without being affected by the external ambient temperature fluctuation, and a stable output temperature is output, thereby achieving high-precision measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0015] Figure 1 This is a schematic diagram of the internal structure of the high-precision infrared thermometer of Example 1;

[0016] Figure 2 This is a front view of the structure of the high-precision infrared thermometer of Example 1;

[0017] Figure 3 It is the temperature control principle diagram of the temperature control instrument in Example 1.

[0018] Figure identification: 1-thermometer body, 2-temperature radiation target surface, 3-temperature control instrument, 4-power switch, 5-switching power supply, 6-power socket, 7-insulation cotton, 8-semiconductor cooling plate, 9-radiator, 10-fan, 11-casing, 12-handle. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the utility model more clearly understood, the utility model is further described in detail below in conjunction with embodiments and drawings. The schematic implementation methods of the utility model and their descriptions are only used to explain the utility model and are not intended to limit the utility model.

[0020] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time. When an element is referred to as being "provided with" another element, it may be provided on the surface or inside of the element.

[0021] Example 1

[0022] A high-precision infrared thermometer in this embodiment, please refer to Figure 1 and Figure 2 , Figure 1 Schematic diagram of the internal structure of the high-precision infrared thermometer of this embodiment. Figure 2 The high-precision infrared thermometer of this embodiment includes a thermostat and a thermometer body 1 in the thermostat. The thermostat includes a heat preservation cavity, a semiconductor refrigeration sheet 8, a temperature radiation target surface 2, a temperature control instrument 3, a housing 11, and a power supply. The temperature radiation target surface 2 is located on the inner wall of the heat preservation cavity. The semiconductor refrigeration sheet 8 is installed close to the outer side of the temperature radiation target surface 2. The temperature control instrument 3 is used to control the temperature of the semiconductor refrigeration sheet 8 according to the temperature of the temperature radiation target surface 2. The temperature of the temperature radiation target surface 2 is controlled by the temperature change of the semiconductor refrigeration sheet 8, and the temperature in the heat preservation cavity is controlled to be constant within a set temperature range. The semiconductor refrigeration sheet 8 in this embodiment is a controllable heating element for cooling and heating. The semiconductor refrigeration sheet 8 is installed close to the temperature radiation target surface 2 to transfer the temperature to the temperature radiation target surface 2. The temperature radiation target surface 2 then radiates the temperature to the internal cavity of the heat preservation cotton 7, so that this part of the cavity is in a constant temperature state, which is equivalent to installing the thermometer in a constant temperature insulation box, which is not affected by external temperature fluctuations.

[0023] The utility model is based on traditional infrared temperature measurement technology, breaking through the limit of the temperature measurement accuracy that the environment is (18-25)℃, and innovatively keeping the ambient temperature constant, providing a separate and stable constant temperature space, with a standard setting of 23℃, and designing the infrared thermometer in a constant temperature box. The ambient temperature of the thermometer is always maintained at 23℃, and is not affected by external ambient temperature fluctuations, and the output temperature is stable, thereby achieving high-precision measurement. The high-precision infrared thermometer of the utility model has high measurement accuracy and can be used as a standard device.

[0024] In some embodiments, the temperature control instrument 3 includes a first temperature sensor and a second temperature sensor, the first temperature sensor is connected to the temperature radiation target surface 2, and is used to detect the temperature of the temperature radiation target surface 2, and the second temperature sensor is used to detect the ambient temperature. The temperature control instrument 3 controls the positive and negative voltages of the MOS tube according to the difference between the set temperature value and the detected ambient temperature value to cool or heat the cold surface of the semiconductor refrigeration sheet 8, and transfers the heat to the temperature radiation target surface 2. The specific temperature control principle is as follows Figure 3 As shown. The ambient temperature and the temperature of the temperature radiation target surface 2 are monitored respectively by two temperature sensors. The temperature control instrument 3 measures the real temperature of the temperature radiation target surface 2 through the first temperature sensor and feeds it back to the temperature control instrument 3, and controls the temperature of the semiconductor refrigeration plate 8 through the control circuit. The first temperature sensor of this embodiment is preferably a contact temperature probe. The temperature control instrument controls the forward and reverse voltages of the MOS tube according to the difference between the set temperature value and the monitored ambient temperature value to cool or heat the cold surface of the refrigeration plate, and transfers the heat to the temperature radiation target surface 2, and then continuously adjusts the voltage according to the difference between the set temperature value and the monitored target surface temperature value, so as to achieve the purpose of keeping the temperature of the temperature radiation target surface 2 within the set temperature range.

[0025] Optionally, in order to improve the heat preservation performance, a heat preservation cotton 7 is provided on the side wall of the heat preservation cavity, and the probe of the thermometer body 1 passes through the heat preservation cotton 7 and communicates with the external environment. The contact part between the probe and the heat preservation cotton 7 is designed to be heat-insulated to reduce temperature exchange.

[0026] As a further technical solution, the high-precision infrared thermometer further includes a heat dissipation device, which includes a radiator 9 and a fan 10, and the radiator 9 is located outside the semiconductor refrigeration sheet 8. The heat dissipation device is mainly used to discharge the temperature in the casing 11 outside the insulation cotton 7, so that the temperature in the casing 11 outside the insulation cotton 7 is consistent with the temperature in the casing 11. The second temperature sensor of the temperature control instrument 3 can be arranged in the space in the casing 11 outside the insulation cotton 7, or can be arranged outside the casing 11. In this embodiment, the space in the casing 11 outside the insulation cotton 7 is preferred.

[0027] As a further technical solution, a handle 12 is also included. The handle 12 is arranged on the upper side of the housing 11 to facilitate the carrying of the thermometer of the utility model.

[0028] The high-precision thermometer of the utility model includes two parts, the thermometer body, the thermostat and the heat dissipation device are located in the upper part. In addition to the above components, the high-precision infrared thermometer of the utility model also includes a power switch 4, a switching power supply 5, and a power socket 6, which are located in the lower part of the thermometer together with the temperature control instrument 3. The advantage of the upper and lower parts is that the device is simple, occupies a small space, and avoids mutual influence between components. For example, the heat dissipation of the switching power supply, if placed in the upper part, may affect the effect of the thermostat, and the second temperature sensor for monitoring the ambient temperature is located in the space inside the casing 11 outside the thermal insulation cotton 7. If the switching power supply 5 is placed in this space, the detection effect of the second temperature sensor will be affected.

[0029] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0030] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit them. Although the utility model is described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. A high-precision infrared thermometer, characterized in that: It includes a constant temperature device and a thermometer body in the constant temperature device, the constant temperature device includes a heat preservation cavity, a semiconductor refrigeration plate, a temperature radiation target surface, a temperature control instrument, a casing, and a power supply. The temperature radiation target surface is located on the inner wall of the heat preservation cavity, the semiconductor refrigeration plate is installed close to the outer side of the temperature radiation target surface, and the temperature control instrument is used to control the temperature of the semiconductor refrigeration plate according to the temperature of the temperature radiation target surface, and the temperature of the temperature radiation target surface is controlled by the temperature change of the semiconductor refrigeration plate, thereby controlling the temperature in the heat preservation cavity to be constant within a set temperature range.

2. A high-precision infrared thermometer according to claim 1, characterized in that: The temperature control instrument includes a first temperature sensor and a second temperature sensor. The first temperature sensor is connected to the temperature radiation target surface and is used to detect the temperature of the temperature radiation target surface. The second temperature sensor is used to detect the ambient temperature. The temperature control instrument controls the forward and reverse voltages of the MOS tube according to the difference between the set temperature value and the detected ambient temperature value to cool or heat the cold surface of the semiconductor refrigeration plate and transfer the heat to the temperature radiation target surface.

3. A high-precision infrared thermometer according to claim 2, characterized in that: The temperature control instrument adjusts the voltage according to the difference between the set temperature value and the detected target surface temperature value, so that the temperature of the temperature radiation target surface is maintained within the set temperature range.

4. The high-precision infrared thermometer according to claim 3, characterized in that: The side wall of the heat-insulating cavity is provided with heat-insulating cotton, and the probe of the thermometer body passes through the heat-insulating cotton and communicates with the external environment.

5. A high-precision infrared thermometer according to claim 4, characterized in that: It also includes a heat dissipation device, which includes a radiator and a fan. The radiator is located on the outside of the semiconductor refrigeration plate, and the fan is located on the inner wall of the casing.

6. A high-precision infrared thermometer according to claim 5, characterized in that: The high-precision infrared thermometer comprises an upper and lower part, wherein the thermometer body, the constant temperature device and the heat dissipation device are located in the upper part, and the temperature control instrument and the switch power supply are located in the lower part.

7. A high-precision infrared thermometer according to claim 6, characterized in that: It also includes a handle, which is arranged on the upper side of the casing.

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