CN111579093A - Infrared body temperature measuring instrument - Google Patents
Infrared body temperature measuring instrument Download PDFInfo
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- CN111579093A CN111579093A CN202010490968.2A CN202010490968A CN111579093A CN 111579093 A CN111579093 A CN 111579093A CN 202010490968 A CN202010490968 A CN 202010490968A CN 111579093 A CN111579093 A CN 111579093A
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- 230000036760 body temperature Effects 0.000 title claims abstract description 23
- 238000011088 calibration curve Methods 0.000 claims abstract description 18
- 238000012545 processing Methods 0.000 claims abstract description 15
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 38
- 229910052751 metal Inorganic materials 0.000 claims description 26
- 239000002184 metal Substances 0.000 claims description 26
- 229910052697 platinum Inorganic materials 0.000 claims description 19
- 238000001179 sorption measurement Methods 0.000 claims description 13
- 238000013459 approach Methods 0.000 claims description 2
- 238000009529 body temperature measurement Methods 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 11
- 238000001514 detection method Methods 0.000 description 10
- 238000005259 measurement Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 238000000338 in vitro Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000012937 correction Methods 0.000 description 3
- 210000003128 head Anatomy 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000001061 forehead Anatomy 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/0022—Radiation pyrometry, e.g. infrared or optical thermometry for sensing the radiation of moving bodies
- G01J5/0025—Living bodies
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/10—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors
- G01J5/20—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors using resistors, thermistors or semiconductors sensitive to radiation, e.g. photoconductive devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
- G01K1/028—Means for indicating or recording specially adapted for thermometers arrangements for numerical indication
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
- G01K13/20—Clinical contact thermometers for use with humans or animals
- G01K13/223—Infrared clinical thermometers, e.g. tympanic
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Radiation Pyrometers (AREA)
Abstract
The invention relates to an infrared body temperature measuring instrument, in particular to a security door type thermometer for collecting the temperature of the head of a human body, aiming at solving the problem of larger temperature measurement precision deviation caused by too low environmental temperature of the existing external thermometer; the collected voltage output by the infrared temperature-sensitive element is sent to the control unit through the temperature signal processing circuit; the control unit is used for acquiring errors when the baffle blocks the light path of the infrared temperature-sensitive element; when the baffle passes through the light path of the infrared temperature-sensitive element, the output temperature corresponding to the acquisition voltage of the infrared temperature-sensitive element at the moment is determined according to the voltage-output temperature calibration curve corresponding to the standard temperature, and the output temperature is corrected according to the error.
Description
Technical Field
The invention relates to an in vitro thermometer, in particular to a safety door type thermometer for collecting the temperature of the head of a human body.
Background
The traditional body temperature measuring instrument, especially an in-vitro non-contact type temperature measuring instrument, is exposed outside when measuring temperature, so that the temperature measuring precision of the temperature measuring instrument is closely related to the ambient temperature, when the ambient temperature is too low or frequently changes, the temperature measuring precision deviation is large, and when the temperature measuring precision changes, an operator cannot know in time, so that a part of temperature measuring data is inaccurate; in addition, the common thermodetector with the temperature correction function needs operators to have professional correction knowledge or needs to adopt a special temperature correction device, which is time-consuming and labor-consuming.
Disclosure of Invention
The invention aims to solve the problem that the temperature measurement precision deviation is large due to the fact that the ambient temperature of an existing in-vitro thermometer is too low, and provides an infrared body temperature measuring instrument.
The invention relates to an infrared body temperature measuring instrument which comprises an infrared temperature sensor, a control unit and a door-shaped bracket;
the infrared temperature sensor is arranged at the cross beam of the door-shaped bracket, and the temperature acquisition end of the infrared temperature sensor is inclined downwards; the control unit is arranged in the door-shaped bracket;
the infrared temperature sensor comprises a metal shell, an infrared temperature-sensitive element, a temperature signal processing circuit and an environment temperature calibration device; the infrared temperature-sensitive element, the temperature signal processing circuit and the environment temperature calibration device are all positioned in the metal shell;
an infrared temperature-sensitive element is fixed on a first side wall in the metal shell, and a temperature sensing end of the infrared temperature-sensitive element is used as a 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 side wall is opposite to the first side wall;
the environment temperature calibration device comprises a platinum resistor temperature sensor, a baffle, 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 rotating shaft, and the baffle can rotate around the baffle rotating shaft, so that a light path of the infrared temperature-sensitive element is blocked or allowed to pass through;
the first electromagnet and the second electromagnet are fixed on the second side wall; the metal adsorption part is fixed with the baffle plate and is positioned between the first electromagnet and the second electromagnet; when the first electromagnet or the second electromagnet generates magnetic force, the metal adsorption part is attracted to move towards the first electromagnet or the second electromagnet, so that the baffle is driven to rotate around the baffle rotating shaft;
a first control signal input end of the first electromagnet is electrically connected with a first electromagnetic control signal output end of the control unit and is used for receiving the first electromagnetic control signal and then electrifying the coil to generate magnetic force;
a second control signal input end of the second electromagnet is electrically connected with a second electromagnetic control signal output end of the control unit and is used for receiving a second electromagnetic control signal and then electrifying the coil to generate magnetic force;
the platinum resistor temperature sensor is used for acquiring the resistance value corresponding to the temperature output of the baffle plate, and the resistance value is sent to the control unit through the temperature signal processing circuit;
the collected voltage output by the infrared temperature-sensitive element is sent to the control unit through the temperature signal processing circuit; the collected voltage comprises voltage collected when the baffle plate passes through the light path of the infrared temperature-sensitive element and voltage collected when the baffle plate blocks the light path of the infrared temperature-sensitive element;
the control unit 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 blocks the light path of the infrared temperature-sensitive element or not; when the baffle blocks the light path of the infrared temperature-sensitive element, the resistance value output by the platinum resistance temperature sensor is converted into temperature which 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 acquisition voltage of the infrared temperature-sensitive element at the moment is determined by referring to the voltage-output temperature calibration curve, the output temperature is used as acquisition temperature, and the difference value between the acquisition temperature and the standard temperature is obtained and used as error; when the baffle passes through the light path of the infrared temperature-sensitive element, the output temperature corresponding to the acquisition voltage of the infrared temperature-sensitive element at the moment is determined according to the voltage-output temperature calibration curve corresponding to the standard temperature, and the output temperature is corrected according to the error.
The invention has the beneficial effects that: the infrared body temperature measuring instrument adopts the rapid and broad-spectrum infrared temperature sensor, is additionally provided with the environment temperature calibrating device, can calibrate the infrared temperature sensor according to the environment temperature at any time according to needs, and solves the problems that the existing in-vitro body temperature measuring equipment cannot be used or has poor temperature measuring precision when the environment temperature is too low (below 0 ℃) or frequently changes. The device has the advantages that the temperature measurement precision is not lower than +/-0.2 ℃ at minus 20 ℃, the measured target temperature is not influenced by the ambient temperature, and the accuracy is high. Can be widely applied to public places with dense population, such as stations, docks, airports, institutions, schools, hospitals and the like.
Drawings
FIG. 1 is a schematic structural diagram of an infrared thermometer according to the present invention;
FIG. 2 is a schematic view of an infrared temperature sensor in the infrared thermometer according to the present invention;
FIG. 3 is a schematic cross-sectional view of an infrared temperature sensor in the infrared thermometer of the present invention;
FIG. 4 is a schematic view of the fitting structure of an infrared temperature sensor, a sensor holder and a door-shaped holder in the infrared body temperature measuring apparatus according to the present invention;
FIG. 5 is a topological diagram of a temperature signal processing circuit in an infrared thermometer according to the present invention;
FIG. 6 is an electrical schematic diagram of an infrared thermometer of the present invention;
FIG. 7 is a schematic diagram of a circuit topology of a control unit in the infrared thermometer of the present invention;
FIG. 8 is a schematic view of an interface circuit topology structure of a circuit control portion of an ambient temperature calibration device in an infrared body temperature measuring apparatus according to the present invention;
FIG. 9 is a schematic view of the topology of the interface circuit of the step motor in the infrared thermometer of the present invention;
FIG. 10 is a schematic view of the topology of the interface circuit of the proximity sensing switch in the infrared thermometer of the present invention;
FIG. 11 is a schematic diagram of the topology of the interface circuit of the temperature display screen in the infrared thermometer according to the present invention;
fig. 12 is a schematic view of a topology structure of an interface circuit of an alarm device in the infrared thermometer of the present invention.
Detailed Description
In a first specific embodiment, the infrared body temperature measuring instrument of the present embodiment includes 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;
an 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; the metal shell 1-1 is provided with a temperature acquisition hole 5 on the second side wall, 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 part 9;
the platinum resistance temperature sensor 6 is fixed on a 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 to pass through;
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 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 then 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 the voltage collected when the baffle 7 passes through the light path of the infrared temperature-sensitive element 1-2 and the 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 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 or not; 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 which 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 acquisition 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 acquisition temperature, and the difference value between the acquisition temperature and the standard temperature is obtained and used as error; when the baffle 7 passes through the light path of the infrared temperature-sensitive element 1-2, the output temperature corresponding to the acquisition voltage of the infrared temperature-sensitive element 1-2 at the moment is determined by referring to a voltage-output temperature calibration curve corresponding to the standard temperature, and the output temperature is corrected according to the error.
Specifically, the infrared body temperature measuring instrument in the present embodiment employs the door-shaped holder 3, and is therefore particularly suitable for measuring the temperature of a specific part (e.g., forehead) of a human body.
As shown in fig. 1, 3 and 6, the device mainly comprises an infrared temperature sensor 1, a sensor support, a control unit 2 (not shown in fig. 1 and 3), a proximity sensing switch 13, a camera 14, a temperature display screen 15, an alarm device 16 and a door-shaped support 3.
The infrared temperature sensor 1 is hermetically packaged by a metal shell 1-1, an infrared temperature sensitive element 1-2 (preferably, ZTP-315), a temperature signal processing circuit 1-3 (as shown in figure 4) and an ambient temperature calibration device are contained in the metal shell 1-1, and other infrared body temperature measuring instruments do not have the structure of an ambient temperature automatic calibration device.
The above-described ambient temperature calibration device is composed of a baffle plate 7 with a platinum resistance temperature sensor 6 (not shown in fig. 1, 3), an electromagnet 8 (electromagnetic coil), and a support member 4 for supporting the baffle plate 7 and the first and second electromagnets 8-1 and 8-2.
As shown in fig. 7, which 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 environmental temperature is calibrated, the control unit 2 sends out a first electromagnetic control signal or a second electromagnetic control signal, one electromagnet of the first electromagnet 8-1 or the second electromagnet 8-2 is made to generate a magnetic adsorption metal adsorption part 9, the baffle 7 with the platinum resistance temperature sensor 6 is placed in front of the lens of the infrared temperature sensitive element 1-2, the infrared temperature sensitive element 1-2 collects the temperature of the baffle 7 and then compares the temperature with the temperature measured by the platinum resistance temperature sensor 6 on the baffle 7 through the control unit 2 to calculate the collection error, therefore, the calibration is performed, and meanwhile, the control unit 2 selects the corresponding pre-stored temperature conversion curve according to the current ambient temperature, so that the temperature measurement precision is further improved.
Fig. 8 shows a schematic diagram of a topology structure of an interface circuit of a circuit control portion in the ambient temperature calibration apparatus.
A best embodiment, which is a further description of the first embodiment, further includes 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 a pair of supporting plates;
a 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 at the same side, the power output shafts are used as rotating shafts of the fixing plates, and the sensor fixing plate 10 can change the angle 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.
In particular, because the temperature sensor in the existing body temperature measuring instrument is fixed in installation position and limited in detection angle, when the height of the measured object (generally, a person whose body temperature is to be measured) is too low or too high, the temperature sensor cannot measure or the measurement data is inaccurate.
Therefore, as shown in FIG. 4, the infrared temperature sensor 1 is mounted on an angle-adjustable sensor holder, the angle adjustment of the sensor holder is driven by a stepping motor 12 (preferred model: 28HS3306B4, not shown in FIG. 4), when the height of the measured object is high, the stepping motor 12 adjusts the sensor holder to increase the detection angle; when the height of the measured target is low, the stepping motor 12 adjusts the sensor bracket to reduce the detection angle.
The schematic diagram of the interface circuit topology of the stepping motor 12 is shown in fig. 9.
In the embodiment, the adjustable sensor support is adopted, the detection range adjusting function is achieved, and the problem of fixed detection angle is solved.
A best embodiment, which is a further description of the first embodiment, further includes a proximity sensing switch 13 and a camera 14;
the proximity sensing switch 13 is fixed outside the door-shaped bracket 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 is used for sending a proximity signal to the control unit 2 after sensing that the detected object 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 measured target, the height of the measured 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.
Specifically, as shown in fig. 1, a camera 14 (preferably, model: sony IMX317) is installed at the bottom center of the door head (beam) of the door-type bracket 3, and the camera 14 may be a monocular high-definition wide-angle camera for acquiring an image of a target to be measured. The camera 14 is directly plugged into the mainboard for use through a USB port.
The detection range of the proximity switch 13 (preferred model: E3F-DS200C4) is preset as a measurement area, when the proximity switch 13 detects that the measured object enters the measurement area, the camera 14 automatically shoots the image of the measured object at a preset reference point, and the height information of the measured object is identified through the existing image identification algorithm pre-configured in the control unit 2, so that the rotation angle of the stepping motor 12 is controlled to adapt to the height of the measured object.
The schematic diagram of the interface circuit topology of the proximity sensing switch 13 is shown in fig. 10.
Best embodiment, this embodiment is a further description of the first embodiment, and in this embodiment, the temperature display screen 15 is further included;
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 object.
Specifically, as shown in fig. 1, the temperature value of the device during the measurement process is displayed on a temperature display screen 15 (preferred model: 18101BS), the device starts to dynamically measure the body temperature of the measured object after the detection angle of the camera 14 is adjusted, and simultaneously the body temperature value during the measurement process is displayed on the display screen 15, which is convenient for the operator or security personnel to check and find problems in time.
The schematic diagram of the interface circuit topology of the temperature display screen 15 is shown in fig. 11.
A best embodiment, which is a further description of the first embodiment, further includes an alarm device 16;
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 object exceeds a set threshold value.
Specifically, as shown in fig. 1, an alarm device 16 (preferably, model: BJ-3) is installed inside the door type bracket 3, and a sound emitting hole is opened on a side wall of the door type bracket 3 for emitting sound of the alarm device 16. An alarm upper limit temperature is preset in the control unit 2, and when the highest temperature value measured by the device is greater than the set alarm upper limit temperature, the alarm device 16 gives an alarm.
Fig. 12 shows a schematic diagram of the interface circuit topology of the alarm device 16.
In conclusion, the use method of the infrared body temperature measuring instrument comprises the following steps:
when the proximity sensing switch 13 detects that the measured object enters the measuring area, the camera 14 automatically shoots the image of the measured object at a preset reference point and identifies the height information of the measured object, and when the height of the measured object is high, the stepping motor 12 adjusts the sensor bracket and increases the detection angle; when the height of the measured object is low, the stepping motor 12 adjusts the detection angle to be low.
After the device finishes the detection angle adjustment, the device starts to dynamically measure the temperature of the measured target, and simultaneously displays the temperature value in the measurement process on the temperature display screen 15. When the measured maximum temperature value is larger than the set alarm upper limit temperature, the alarm device 16 gives an alarm.
After the device is started, when the device is not used for measurement (non-working), a calibration time interval can be set, for example, every 70s, the ambient temperature calibration device is started, the baffle 7 with the platinum resistance temperature sensor 6 is arranged in front of the lens of the infrared temperature-sensitive element 1-2, the infrared temperature-sensitive element 1-2 collects temperature conversion of the baffle 7 and compares the temperature conversion with the temperature collected by the platinum resistance temperature sensor 6, a collection error is calculated, and meanwhile, the control unit 2 selects a corresponding voltage-output temperature calibration curve according to the current ambient temperature, so that the temperature measurement precision is further improved.
The specific steps of the process are as follows:
1. before the infrared temperature-sensitive element 1-2 is assembled, temperature calibration is carried out to obtain voltage-output temperature calibration curves under different temperature gradients, for example, 9 pieces of (-20, -10, 0, 10, 20, 30, 40, 50, 60 ℃) voltage-output temperature calibration curve data under different temperatures are measured, and the voltage-output temperature calibration curve data are stored into the infrared temperature-sensitive element 1-2 or the control unit 2;
2. the infrared temperature-sensitive element 1-2 is packaged by aluminum, and when the infrared temperature-sensitive element 1-2 is placed in a working occasion, the internal temperature of the infrared temperature-sensitive element 1-2 and the external environment temperature quickly tend to be consistent, so that the resistance value of the platinum resistor temperature sensor 6 on the baffle 7 is measured, and the resistance value of the platinum resistor is converted into the temperature, so that the accurate temperature value (standard temperature) of the current environment temperature of the environment temperature calibration device can be obtained;
3. by using preset voltage-output temperature calibration curve data, obtaining voltage-output temperature calibration curve data corresponding to the standard temperature through a mathematical interpolation method (or direct selection), and converting the voltage value of the output sensor of the infrared temperature sensitive element 1-2 into a temperature value (acquisition temperature) according to the voltage-output temperature calibration curve data. (temperatures scaled from the voltage-output temperature calibration curve are more accurate than those without calibration);
4. and comparing the acquired temperature with the standard temperature, calculating an error, correcting subsequent output temperature, and further improving the precision of the output temperature.
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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| CN202010490968.2A CN111579093A (en) | 2020-06-02 | 2020-06-02 | Infrared body temperature measuring instrument |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113237560A (en) * | 2021-05-10 | 2021-08-10 | 云南锡业股份有限公司铜业分公司 | Automatic temperature measurement method for slag ladle car vehicle-mounted device |
| CN114719991A (en) * | 2022-04-08 | 2022-07-08 | 山东三宏信息科技有限公司 | Temperature measuring device based on ambient temperature correction |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113237560A (en) * | 2021-05-10 | 2021-08-10 | 云南锡业股份有限公司铜业分公司 | Automatic temperature measurement method for slag ladle car vehicle-mounted device |
| CN114719991A (en) * | 2022-04-08 | 2022-07-08 | 山东三宏信息科技有限公司 | Temperature measuring device based on ambient temperature correction |
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