CN111579093A - An infrared thermometer - Google Patents

Abstract

An infrared body temperature measuring instrument of the present invention relates to a security door-type thermometer for collecting the temperature of a human head. The problem is that the platinum resistance temperature sensor is fixed on the baffle, and the platinum resistance temperature sensor is used to collect the resistance value corresponding to the temperature output of the baffle, and the resistance value is sent to the control unit through the temperature signal processing circuit; The temperature signal processing circuit is sent to the control unit; the control unit is used to obtain the error when the baffle blocks the optical path of the infrared temperature sensitive element; when the baffle passes the optical path of the infrared temperature sensitive element, refer to the voltage-output temperature corresponding to the standard temperature The calibration curve determines the output temperature corresponding to the acquisition voltage of the infrared temperature sensitive element at this time, and corrects the output temperature according to the error.

Description

An infrared thermometer

technical field

The invention relates to an in vitro thermometer, in particular to a security door-type thermometer for collecting the temperature of a human head.

Background technique

Traditional body temperature measuring instruments, especially in vitro non-contact thermometers, are exposed to the outside during temperature measurement, so the temperature measurement accuracy of this kind of thermometer is closely related to the ambient temperature. When the ambient temperature is too low or changes frequently, The temperature measurement accuracy has a large deviation, and when the temperature measurement accuracy changes, the operator cannot know in time, resulting in inaccurate part of the temperature measurement data; and generally, a thermometer with a temperature correction function requires the operator to have Professional calibration knowledge or special temperature calibration device is required, which is time-consuming and labor-intensive.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an infrared body temperature measuring instrument in order to overcome the problem of large deviation of temperature measurement accuracy caused by the low ambient temperature of the existing in vitro thermometer.

An infrared body temperature measuring instrument of the present invention comprises an infrared temperature sensor, a control unit and a door-type bracket;

The infrared temperature sensor is arranged at the beam of the door-type bracket, and the temperature collection end of the infrared temperature sensor is inclined downward; the control unit is arranged in the door-type bracket;

The infrared temperature sensor includes a metal casing, an infrared temperature sensitive element, a temperature signal processing circuit and an ambient temperature calibration device; the infrared temperature sensitive element, the temperature signal processing circuit and the ambient temperature calibration device are all located in the metal casing;

An infrared temperature sensitive element is fixed on the first side wall in the metal shell, and the temperature sensing end of the infrared temperature sensitive element serves as the temperature acquisition end of the infrared temperature sensor; the metal shell is provided with a temperature acquisition hole on the second side wall, and the second the side wall is opposite to the first side wall;

The ambient temperature calibration device includes a platinum resistance temperature sensor, a baffle plate, a pair of electromagnets and a metal adsorption part;

The platinum resistance temperature sensor is fixed on the baffle, the baffle is connected to the second side wall through the baffle shaft, and the baffle can rotate around the baffle shaft, thereby blocking or passing the light path of the infrared temperature sensitive element;

Both the first electromagnet and the second electromagnet are fixed on the second side wall; the metal adsorption part is fixed to the baffle, and the metal adsorption part is located between the first electromagnet and the second electromagnet; when the first electromagnet or the second electromagnet When the two electromagnets generate magnetic force, the metal adsorption component is attracted to move toward the first electromagnet or the second electromagnet, thereby driving the baffle to rotate around the baffle shaft;

The first control signal input end of the first electromagnet is electrically connected with the first electromagnetic control signal output end of the control unit, and is used for generating a magnetic force after the coil is energized after receiving the first electromagnetic control signal;

The second control signal input end of the second electromagnet is electrically connected with the second electromagnetic control signal output end of the control unit, and is used for generating a magnetic force after the coil is energized after receiving the second electromagnetic control signal;

The platinum resistance temperature sensor is used to collect the resistance value corresponding to the temperature output of the baffle, and the resistance value is sent to the control unit through the temperature signal processing circuit;

The collection voltage output by the infrared temperature-sensitive element is sent to the control unit through the temperature signal processing circuit; the collection voltage includes the voltage collected when the baffle passes the light path of the infrared temperature-sensitive element and the voltage collected when the baffle blocks the light path of the infrared temperature-sensitive element ;

The control unit is used to send out the first electromagnetic control signal and the second electromagnetic control signal at the set time interval to control whether the baffle blocks the optical path of the infrared temperature sensitive element; when the baffle blocks the optical path of the infrared temperature sensitive element, the platinum resistance The resistance value output by the temperature sensor is converted into temperature, and as the standard temperature, find a preset voltage-output temperature calibration curve corresponding to the standard temperature and refer to the voltage-output temperature calibration curve to determine the acquisition voltage of the infrared temperature sensor at this time. The corresponding output temperature, the output temperature is used as the acquisition temperature, and the difference between the acquisition temperature and the standard temperature is obtained as the error; when the baffle passes the optical path of the infrared temperature sensitive element, refer to the voltage-output temperature calibration curve corresponding to the standard temperature to determine At this time, the output temperature corresponding to the collected voltage of the infrared temperature sensitive element is corrected according to the error.

The beneficial effects of the present invention are as follows: the infrared body temperature measuring instrument of the present invention adopts a fast and broad-spectrum infrared temperature sensor, and an ambient temperature calibration device is added, which can calibrate the infrared temperature sensor at any time according to the ambient temperature as required, which solves the problem of the existing external temperature sensor. The temperature measurement equipment cannot be used when the ambient temperature is too low (below 0 degrees Celsius) or changes frequently, or the temperature measurement accuracy is poor. The temperature measurement accuracy of the device is not less than ±0.2 degrees Celsius at minus 20 degrees Celsius, the measured target temperature is not affected by the ambient temperature, and the accuracy is high. It can be widely used in densely populated public places such as stations, docks, airports, institutions, schools, hospitals, etc.

Description of drawings

Fig. 1 is the structural representation of a kind of infrared body temperature measuring instrument of the present invention;

2 is a schematic structural diagram of an infrared temperature sensor in an infrared body temperature measuring instrument of the present invention;

3 is a schematic cross-sectional structural diagram of an infrared temperature sensor in an infrared body temperature measuring instrument of the present invention;

4 is a schematic diagram of the matching structure of an infrared temperature sensor, a sensor support and a portal support in an infrared body temperature measuring instrument of the present invention;

5 is a topology diagram of a temperature signal processing circuit in an infrared body temperature measuring instrument of the present invention;

6 is a schematic diagram of the electrical structure of an infrared body temperature measuring instrument of the present invention;

7 is a schematic diagram of the circuit topology of a control unit in an infrared body temperature measuring instrument of the present invention;

8 is a schematic diagram of the interface circuit topology of the circuit control part of the ambient temperature calibration device in an infrared body temperature measuring instrument of the present invention;

9 is a schematic diagram of the interface circuit topology structure of a stepping motor in an infrared body temperature measuring instrument of the present invention;

10 is a schematic diagram of the interface circuit topology of the proximity sensing switch in an infrared body temperature measuring instrument of the present invention;

11 is a schematic diagram of the interface circuit topology structure of the temperature display screen in an infrared body temperature measuring instrument of the present invention;

12 is a schematic diagram of the interface circuit topology of an alarm device in an infrared body temperature measuring instrument of the present invention.

Detailed ways

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 1, an infrared body temperature measuring instrument of this embodiment includes an infrared temperature sensor 1, a control unit 2 and a door-type bracket 3;

The infrared temperature sensor 1 is arranged at the beam of the door-type bracket 3, and the temperature collection end of the infrared temperature sensor 1 is inclined downward; the control unit 2 is arranged in the door-type bracket 3;

The infrared temperature sensor 1 includes a metal casing 1-1, an infrared temperature sensitive element 1-2, a temperature signal processing circuit 1-3 and an ambient temperature calibration device; an infrared temperature sensitive element 1-2, a temperature signal processing circuit 1-3 and an ambient temperature The calibration devices are located in the metal casing 1-1;

An infrared temperature sensitive element 1-2 is fixed on the first side wall in the metal casing 1-1, and the temperature sensing end of the infrared temperature sensitive element 1-2 serves as the temperature collection terminal of the infrared temperature sensor 1; A temperature collection hole 5 is opened on the second side wall, and the second side wall is opposite to the first side wall;

The ambient temperature calibration device includes a platinum resistance temperature sensor 6, a baffle plate 7, a pair of electromagnets 8 and a metal adsorption part 9;

The platinum resistance temperature sensor 6 is fixed on the baffle plate 7, and the baffle plate 7 is connected to the second side wall through the baffle plate rotating shaft. light path;

The first electromagnet 8-1 and the second electromagnet 8-2 are both fixed on the second side wall; the metal adsorption part 9 is fixed to the baffle 7, and the metal adsorption part 9 is located on the first electromagnet 8-1 and the second electromagnet 8-1. Between the electromagnets 8-2; when the first electromagnet 8-1 or the second electromagnet 8-2 generates a magnetic force, the attracting metal adsorption member 9 moves toward the first electromagnet 8-1 or the second electromagnet 8-2 , thereby driving the baffle 7 to rotate around the baffle axis;

The first control signal input end of the first electromagnet 8-1 is electrically connected with the first electromagnetic control signal output end of the control unit 2, and is used for generating a magnetic force after the coil is energized after receiving the first electromagnetic control signal;

The second control signal input end of the second electromagnet 8-2 is electrically connected to the second electromagnetic control signal output end of the control unit 2, for receiving the second electromagnetic control signal, the coil is energized to generate a magnetic force;

The platinum resistance temperature sensor 6 is used to collect the resistance value corresponding to the temperature output of the baffle plate 7, and the resistance value is sent to the control unit 2 through the temperature signal processing circuit 1-3;

The collecting voltage output by the infrared temperature sensitive element 1-2 is sent to the control unit 2 through the temperature signal processing circuit 1-3; 7. The voltage collected when blocking the light path of the infrared temperature sensitive element 1-2;

The control unit 2 is used to send out the first electromagnetic control signal and the second electromagnetic control signal at the set time interval to control whether the baffle 7 blocks the light path of the infrared temperature sensitive element 1-2; when the baffle 7 blocks the infrared temperature sensitive element 1 When the optical path of -2 is used, the resistance value output by the platinum resistance temperature sensor 6 is converted into temperature and used as the standard temperature. Find a preset voltage-output temperature calibration curve corresponding to the standard temperature and refer to the voltage-output temperature calibration curve. Determine the output temperature corresponding to the acquisition voltage of the infrared temperature sensitive element 1-2 at this time, the output temperature is used as the acquisition temperature, and the difference between the acquisition temperature and the standard temperature is obtained as the error; when the baffle 7 passes the infrared temperature sensitive element 1- 2, refer to the voltage-output temperature calibration curve corresponding to the standard temperature to determine the output temperature corresponding to the acquisition voltage of the infrared temperature sensor 1-2 at this time, and correct the output temperature according to the error.

Specifically, the infrared body temperature measuring instrument in this embodiment adopts the portal bracket 3, so it is especially suitable for measuring the temperature of a specific part of the human body (such as the forehead).

As shown in Figures 1, 3 and 6, the device mainly consists of an infrared temperature sensor 1, a sensor bracket, a control unit 2 (not shown in Figures 1 and 3), a proximity sensing switch 13, a camera 14, a temperature display screen 15, The alarm device 16 is composed of the door type bracket 3 .

Among them, the infrared temperature sensor 1 is fully sealed with a metal casing 1-1, and the metal casing 1-1 contains an infrared temperature sensitive element 1-2 (preferred model: ZTP-315) and a temperature signal processing circuit 1-3 (Figure 4). shown) and the ambient temperature calibration device, while other infrared thermometers do not have the structure of the ambient temperature automatic calibration device.

The above-mentioned ambient temperature calibration device consists of a baffle plate 7 with a platinum resistance temperature sensor 6 (not shown in FIG. 1 and FIG. 3 ), an electromagnet 8 (electromagnetic coil), and a first electromagnet 8-1 for supporting the baffle plate 7 and the first electromagnet 8-1. and the supporting member 4 of the second electromagnet 8-2.

As shown in FIG. 7, it is a schematic diagram of the circuit topology of the control unit 2. The internal clock of the control unit 2 sets the ambient temperature calibration cycle frequency. When the ambient temperature calibration is performed, the control unit 2 sends a first electromagnetic control signal or a second electromagnetic control signal. The control signal makes one electromagnet in the first electromagnet 8-1 or the second electromagnet 8-2 to generate a magnetic adsorption metal adsorption part 9, and the baffle plate 7 with the platinum resistance temperature sensor 6 is placed on the infrared temperature sensitive element In front of the lens of 1-2, the infrared temperature sensitive element 1-2 collects the temperature of the baffle 7 and compares it with the temperature measured by the platinum resistance temperature sensor 6 on the baffle 7 through the control unit 2 to calculate the acquisition error, so as to correct it and control the temperature at the same time. The unit 2 selects a pre-stored corresponding temperature conversion curve according to the current ambient temperature to further improve the temperature measurement accuracy.

The schematic diagram of the interface circuit topology of the circuit control part in the ambient temperature calibration device is shown in FIG. 8 .

The best embodiment, this embodiment is a further description of the first embodiment, in this embodiment, it also includes a sensor bracket;

The sensor bracket includes a sensor fixing plate 10, a base 11 and a stepping motor 12;

The base 11 is fixed at the beam of the portal bracket 3, and the base 11 includes a pair of support plates;

The sensor fixing plate 10 is fixed to the side wall of the casing of the stepping motor 12, and the sensor fixing plate 10 is located between the paired support plates;

The stepper motor 12 is a double-shaft extension stepper motor. The power output shafts at both ends of the stepper motor 12 are respectively fixed with the support plates on the same side. The power output shaft is used as the rotation axis of the fixed plate. 10 can change the angle relative to the base 11;

The infrared temperature sensor 1 is fixed on the sensor fixing plate 10;

The motor control signal input end of the stepping motor 12 is electrically connected with the motor control signal output end of the control unit 2, and is used for rotating after receiving the motor control signal.

Specifically, because the installation position of the temperature sensor in the existing body temperature measuring instrument is fixed and the detection angle is limited, when the height of the measured target (generally the person whose body temperature is to be measured) is too low or too high, the temperature sensor cannot measure or measure data. Inaccurate.

Therefore, as shown in Figure 4, the infrared temperature sensor 1 is installed on a sensor bracket with an adjustable angle, and the angle adjustment of the sensor bracket is driven by a stepping motor 12 (preferred model: 28HS3306B4, not shown in Figure 4). When the height is high, the stepper motor 12 adjusts the sensor bracket to increase the detection angle; when the height of the measured target is low, the stepper motor 12 adjusts the sensor bracket to lower the detection angle.

The schematic diagram of the interface circuit topology of the stepping motor 12 is shown in FIG. 9 .

In this embodiment, an adjustable sensor bracket is used to achieve the function of adjusting the detection range and solve the problem of fixed detection angle.

The best embodiment, this embodiment is a further description of the first embodiment, in this embodiment, the proximity sensing switch 13 and the camera 14 are also included;

The proximity sensing switch 13 is fixed outside the door bracket 3 , and the proximity signal output end of the proximity sensing switch 13 is electrically connected to the proximity signal input end of the control unit 2 , and is used to send a proximity signal to the control unit after sensing the proximity of the measured target. 2;

The camera 14 is fixed on the side wall of the infrared temperature sensor 1, and the orientation of the camera 14 is consistent with the orientation of the temperature collection end of the infrared temperature sensor 1;

The image capture signal input end of the camera 14 is electrically connected to the image capture signal output end of the control unit 2, and is used for collecting the image of the object under test after receiving the image capture signal;

The image output end of the camera 14 is electrically connected with the image input end of the control unit 2, and is used for sending the collected image of the measured target to the control unit 2;

The control unit 2 is used to send an image acquisition signal to the camera 14 after receiving the proximity signal; calculate the height of the measured target after receiving the image of the measured target, and calculate the rotation angle of the stepping motor 12 according to the height to generate a motor control signal.

Specifically, as shown in FIG. 1 , a camera 14 (preferred model: Sony IMX317) is installed in the center of the bottom end of the door head (beam) of the door-type bracket 3, and the camera 14 can be a monocular high-definition wide-angle camera for collecting the measured target image. The camera 14 is directly plugged into the motherboard through the USB port for use.

The detection range of the proximity switch 13 (preferred model: E3F-DS200C4) is preset as the measurement area. When the proximity switch 13 detects that the target to be measured enters the measurement area, the camera 14 automatically shoots the target at the preset reference point. Image, through the existing image recognition algorithm preconfigured in the control unit 2 to identify the height information of the measured target, so as to control the rotation angle of the stepping motor 12 to adapt to the height of the measured target.

The schematic diagram of the interface circuit topology of the proximity sensing switch 13 is shown in FIG. 10 .

The best embodiment, this embodiment is a further description of the first embodiment, in this embodiment, the temperature display screen 15 is also included;

The temperature display signal input end of the temperature display screen 15 is electrically connected to the temperature display signal output end of the control unit 2 for displaying the body temperature of the measured target.

Specifically, as shown in FIG. 1 , the temperature value of the device during the measurement process is displayed on the temperature display screen 15 (preferred model: 18101BS). After the camera 14 completes the adjustment of the detection angle, the device starts to measure the target. The body temperature of the device is dynamically measured, and the body temperature value during the measurement process is displayed on the display screen 15, which is also convenient for operators or security personnel to check and find problems in time.

The schematic diagram of the interface circuit topology structure of the temperature display screen 15 is shown in FIG. 11 .

The best embodiment, this embodiment is a further description of the first embodiment, in this embodiment, an alarm device 16 is also included;

The alarm signal input end of the alarm device 16 is electrically connected to the alarm signal output end of the control unit 2, and is used to issue an alarm when the body temperature of the measured object exceeds the set threshold.

Specifically, as shown in FIG. 1 , the alarm device 16 (preferred model: BJ-3) is installed inside the door-type bracket 3 , and the side wall of the door-type bracket 3 is provided with a sound hole for the sound of the alarm device 16 to be transmitted. The alarm upper limit temperature is preset in the control unit 2. When the highest temperature value measured by the device is greater than the set alarm upper limit temperature, the alarm device 16 issues an alarm.

The schematic diagram of the interface circuit topology structure of the alarm device 16 is shown in FIG. 12 .

To sum up, the usage of this infrared thermometer is as follows:

When the proximity switch 13 detects that the measured target enters the measurement area, the camera 14 automatically captures an image of the measured target at a preset reference point, and recognizes the height information of the measured target. When the measured target is taller, the stepping motor 12 Adjust the sensor bracket to increase the detection angle; when the height of the measured target is low, the stepper motor 12 lowers the detection angle.

After the device completes the adjustment of the detection angle, it starts to dynamically measure the temperature of the measured target, and at the same time displays the temperature value during the measurement on the temperature display screen 15 . When the measured maximum temperature value is greater than the set alarm upper limit temperature, the alarm device 16 issues an alarm.

When the device is not measured (not working) after starting, the calibration time interval can be set, such as every 70s, the ambient temperature calibration device is started, and the baffle 7 with the platinum resistance temperature sensor 6 is placed in the infrared temperature sensitive element 1-2. In front of the lens, the infrared temperature sensitive element 1-2 collects the temperature of the baffle 7 and compares it with the temperature collected by the platinum resistance temperature sensor 6 to calculate the collection error, while the control unit 2 selects the corresponding voltage-output temperature calibration curve according to the current ambient temperature, Further improve the temperature measurement accuracy.

The specific steps of the above process are as follows:

1. The temperature calibration of infrared temperature sensitive elements 1-2 will be carried out before assembly, and the voltage-output temperature calibration curves under different temperature gradients will be obtained. For example, 9 (-20, -10, 0, 10, 20, 30, 40, 50, 60°C) voltage-output temperature calibration curve data, and store these voltage-output temperature calibration curve data in infrared temperature sensitive element 1-2 or control unit 2;

2. The infrared temperature sensitive element 1-2 is packaged in aluminum. When placed in the workplace, the internal temperature of the infrared temperature sensitive element 1-2 will quickly become the same as the external ambient temperature. Therefore, the platinum resistance temperature sensor on the baffle plate 7 is measured. 6, and convert the resistance value of platinum resistance into temperature to obtain the accurate temperature value (standard temperature) of the current ambient temperature of the ambient temperature calibration device;

3. Use the preset voltage-output temperature calibration curve data to obtain the voltage-output temperature calibration curve data corresponding to the standard temperature through mathematical interpolation method (or direct selection), and convert the infrared rays according to the voltage-output temperature calibration curve data. The temperature sensor 1-2 outputs the sensor voltage value and converts it into a temperature value (collected temperature). (The temperature converted according to the voltage-output temperature calibration curve is more accurate than that without calibration);

4. Compare the collected temperature with the standard temperature, calculate the error and correct the subsequent output temperature to further improve the output temperature accuracy.

Claims (5)

1. An infrared body temperature measuring instrument is characterized by comprising an infrared temperature sensor (1), a control unit (2) and a door-shaped bracket (3);

the infrared temperature sensor (1) is arranged at the cross beam of the door-shaped bracket (3), and the temperature acquisition end of the infrared temperature sensor (1) is inclined downwards; the control unit (2) is arranged in the door-shaped bracket (3);

the infrared temperature sensor (1) comprises a metal shell (1-1), an infrared temperature-sensitive element (1-2), a temperature signal processing circuit (1-3) and an environment temperature calibration device; the infrared temperature-sensitive element (1-2), the temperature signal processing circuit (1-3) and the environment temperature calibration device are all positioned in the metal shell (1-1);

the infrared temperature-sensitive element (1-2) is fixed on a first side wall in the metal shell (1-1), and a temperature sensing end of the infrared temperature-sensitive element (1-2) is used as a temperature acquisition end of the infrared temperature sensor (1); a second side wall of the metal shell (1-1) is provided with a temperature acquisition hole (5), and the second side wall is opposite to the first side wall;

the environment temperature calibration device comprises a platinum resistor temperature sensor (6), a baffle (7), a pair of electromagnets (8) and a metal adsorption component (9);

the platinum resistor temperature sensor (6) is fixed on the baffle (7), the baffle (7) is connected to the second side wall through a baffle rotating shaft, and the baffle (7) can rotate around the baffle rotating shaft so as to block or allow a light path of the infrared temperature-sensitive element (1-2);

the first electromagnet (8-1) and the second electromagnet (8-2) are fixed on the second side wall; the metal adsorption part (9) is fixed with the baffle (7), and the metal adsorption part (9) is positioned between the first electromagnet (8-1) and the second electromagnet (8-2); when the first electromagnet (8-1) or the second electromagnet (8-2) generates magnetic force, the metal adsorption part (9) is attracted to move towards the first electromagnet (8-1) or the second electromagnet (8-2), so that the baffle (7) is driven to rotate around the baffle rotating shaft;

a first control signal input end of the first electromagnet (8-1) is electrically connected with a first electromagnetic control signal output end of the control unit (2) and is used for receiving the first electromagnetic control signal and electrifying the coil to generate magnetic force;

a second control signal input end of the second electromagnet (8-2) is electrically connected with a second electromagnetic control signal output end of the control unit (2) and is used for receiving a second electromagnetic control signal and then electrifying the coil to generate magnetic force;

the platinum resistor temperature sensor (6) is used for acquiring a resistance value corresponding to the temperature output of the baffle (7), and the resistance value is sent to the control unit (2) through the temperature signal processing circuit (1-3);

the collected voltage output by the infrared temperature-sensitive element (1-2) is sent to the control unit (2) through the temperature signal processing circuit (1-3); the collected voltage comprises voltage collected when the baffle (7) passes through the light path of the infrared temperature-sensitive element (1-2) and voltage collected when the baffle (7) blocks the light path of the infrared temperature-sensitive element (1-2);

the control unit (2) is used for sending out a first electromagnetic control signal and a second electromagnetic control signal at a set time interval to control whether the baffle (7) blocks the light path of the infrared temperature-sensitive element (1-2); when the baffle (7) blocks the light path of the infrared temperature-sensitive element (1-2), the resistance value output by the platinum resistance temperature sensor (6) is converted into temperature, the temperature is used as standard temperature, a preset voltage-output temperature calibration curve corresponding to the standard temperature is found out, the output temperature corresponding to the collection voltage of the infrared temperature-sensitive element (1-2) at the moment is determined by referring to the voltage-output temperature calibration curve, the output temperature is used as collection temperature, and the difference value between the collection temperature and the standard temperature is obtained and used as an error; when the baffle (7) passes through the light path of the infrared temperature-sensitive element (1-2), determining the output temperature corresponding to the collected voltage of the infrared temperature-sensitive element (1-2) at the moment by referring to a voltage-output temperature calibration curve corresponding to the standard temperature, and correcting the output temperature according to the error.

2. The infrared thermometer of claim 1 further comprising a sensor holder;

the sensor bracket comprises a sensor fixing plate (10), a base (11) and a stepping motor (12);

the base (11) is fixed at the cross beam of the door-shaped bracket (3), and the base (11) comprises paired supporting plates;

the sensor fixing plate (10) is fixed with the side wall of the shell of the stepping motor (12), and the sensor fixing plate (10) is positioned between the paired supporting plates;

the stepping motor (12) is a double-shaft extension stepping motor, power output shafts at two ends of the stepping motor (12) are respectively fixed with the supporting plates on the same side, the power output shafts are used as rotating shafts of the fixing plates, and the angle of the sensor fixing plate (10) can be changed relative to the base (11) through the operation of the stepping motor (12);

the infrared temperature sensor (1) is fixed on the sensor fixing plate (10);

the motor control signal input end of the stepping motor (12) is electrically connected with the motor control signal output end of the control unit (2) and is used for receiving the motor control signal and then rotating.

3. The infrared thermometer according to claim 2, characterized in that it further comprises a proximity sensing switch (13) and a camera (14);

the proximity sensing switch (13) is fixed outside the door-shaped support (3), and a proximity signal output end of the proximity sensing switch (13) is electrically connected with a proximity signal input end of the control unit (2) and used for sending a proximity signal to the control unit (2) after sensing that the detected target is close;

the camera (14) is fixed on the side wall of the infrared temperature sensor (1), and the orientation of the camera (14) is consistent with the orientation of the temperature acquisition end of the infrared temperature sensor (1);

the image acquisition signal input end of the camera (14) is electrically connected with the image acquisition signal output end of the control unit (2) and is used for receiving the image acquisition signal and then acquiring an image of a target to be detected;

the image output end of the camera (14) is electrically connected with the image input end of the control unit (2) and is used for sending the collected measured target image to the control unit (2);

the control unit (2) is used for sending an image acquisition signal to the camera (14) after receiving the approach signal; after receiving the image of the detected target, the height of the detected target is calculated, and a motor control signal is generated after the rotation angle of the stepping motor (12) is calculated according to the height.

4. An infrared thermometer according to claim 1, 2 or 3, characterized by further comprising a temperature display screen (15);

and the temperature display signal input end of the temperature display screen (15) is electrically connected with the temperature display signal output end of the control unit (2) and is used for displaying the body temperature of the measured target.

5. An infrared thermometer according to claim 1, 2 or 3, characterized by further comprising alarm means (16);

and the alarm signal input end of the alarm device (16) is electrically connected with the alarm signal output end of the control unit (2) and is used for giving an alarm when the body temperature of the measured target exceeds a set threshold value.

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