CN111323133A - Temperature compensation method and device for temperature sensor, electronic equipment and storage medium - Google Patents

Temperature compensation method and device for temperature sensor, electronic equipment and storage medium Download PDF

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CN111323133A
CN111323133A CN202010092497.XA CN202010092497A CN111323133A CN 111323133 A CN111323133 A CN 111323133A CN 202010092497 A CN202010092497 A CN 202010092497A CN 111323133 A CN111323133 A CN 111323133A
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temperature
distance
compensation
sensor
compensation coefficient
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CN111323133B (en
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刘文昉
吴铎
郑杰
刘敏
周超
曾意忠
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Xian System Sensor Electronics Ltd
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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
    • G01J5/02—Constructional details
    • G01J5/06—Arrangements for eliminating effects of disturbing radiation; Arrangements for compensating changes in sensitivity
    • 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
    • G01J5/02—Constructional details
    • G01J5/06—Arrangements for eliminating effects of disturbing radiation; Arrangements for compensating changes in sensitivity
    • G01J5/068—Arrangements for eliminating effects of disturbing radiation; Arrangements for compensating changes in sensitivity by controlling parameters other than temperature

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Abstract

The invention provides a temperature compensation method and a temperature compensation device for a temperature sensor, electronic equipment and a storage medium, wherein the temperature compensation method for the temperature sensor comprises the following steps: calculating a distance compensation coefficient according to the size parameter of the heating surface of the object to be measured and the distance between the object to be measured and the temperature sensing sensor based on a distance compensation model; based on an angle compensation model, calculating an angle compensation coefficient according to the position of the object to be detected in a pixel matrix of the temperature sensor; and compensating the temperature of the object to be detected by the temperature sensing sensor by adopting a distance compensation coefficient and/or an angle compensation coefficient to obtain a compensated temperature. The method and the device provided by the invention can realize the temperature compensation of the temperature sensing sensor.

Description

Temperature compensation method and device for temperature sensor, electronic equipment and storage medium
Technical Field
The invention relates to the field of temperature sensing detection, in particular to a temperature compensation method and device for a temperature sensor, electronic equipment and a storage medium.
Background
With the development of scientific technology, the traditional contact type temperature measurement mode can not meet the temperature measurement requirements in some modern fields, and the requirements on non-contact and remote temperature measurement technologies are increasing. Conventional temperature measurement techniques have matured over a considerable period of time.
The non-contact infrared temperature measurement is also called radiation temperature measurement, can realize large-area temperature measurement, and can also realize temperature measurement of a certain point on a measured object. The temperature sensor for non-contact infrared temperature measurement has the advantages of low cost, no contact with a measured object during temperature measurement, short response time, no interference with a measured temperature field, long service life, convenient operation and the like, but utilizes infrared radiation to measure temperature, is inevitably influenced by external factors such as object emissivity, temperature measurement distance, smoke dust, water vapor and the like, and has larger measurement error.
How to realize the temperature compensation of the temperature-sensitive sensor is a technical problem to be solved urgently in the field.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a temperature compensation method and device for a temperature-sensing sensor, an electronic device and a storage medium, so as to realize the temperature compensation of the temperature-sensing sensor.
According to an aspect of the present invention, there is provided a temperature compensation method of a temperature sensitive sensor, including: calculating a distance compensation coefficient according to the size parameter of the heating surface of the object to be measured and the distance between the object to be measured and the temperature sensing sensor based on a distance compensation model; based on an angle compensation model, calculating an angle compensation coefficient according to the position of the object to be detected in a pixel matrix of the temperature sensor; and compensating the temperature of the object to be detected by the temperature sensing sensor by adopting a distance compensation coefficient and/or an angle compensation coefficient to obtain a compensated temperature.
In some embodiments of the present invention, the position of the object to be measured in the pixel matrix of the temperature-sensitive sensor is represented by a coordinate of a highest temperature of the object to be measured in the pixel matrix of the temperature-sensitive sensor, the angle compensation coefficient is a product of an abscissa angle compensation coefficient and an ordinate angle compensation coefficient, and the angle compensation model includes a first angle compensation model configured to calculate the abscissa angle compensation coefficient and a second angle compensation model configured to calculate the ordinate angle compensation coefficient.
In some embodiments of the invention, the first angle compensation model is generated by:
for at least one temperature sensing sensor with the same model, for the same test object, when the distance between the test object and the temperature sensing sensor is unchanged, and the test object is in a pixel matrix of the temperature sensing sensor, and the ordinate of the highest temperature point is unchanged, acquiring a first compensation curve between the abscissa of the highest temperature point and a quasi-abscissa angle compensation coefficient in the pixel matrix of the temperature sensing sensor, wherein the first compensation curve is generated according to the values of the abscissa of the highest temperature point and the quasi-abscissa angle compensation coefficient in a plurality of groups of the same test object in the pixel matrix of the temperature sensing sensor; and fitting at least one first compensation curve to obtain the first angle compensation model.
In some embodiments of the invention, the quasi-abscissa angle compensation coefficient cprxCalculated according to the following formula:
Figure BDA0002384171140000021
wherein, TcenIs a matrix reference temperature, which is the temperature, T, of the same test object detected by the temperature sensor when the highest temperature point is the center of the pixel matrix of the temperature sensor in the pixel matrix of the temperature sensorxWhen the same test object is in the pixel matrix of the temperature sensor and the abscissa of the highest point of temperature is x, the temperature sensor detects the temperature of the same test object.
In some embodiments of the invention, the second angle compensation model is generated by:
for at least one temperature sensing sensor with the same model, when the distance between the test object and the temperature sensing sensor is unchanged and the abscissa of the highest temperature point of the test object in the pixel matrix of the temperature sensing sensor is unchanged, a second compensation curve between the ordinate of the highest temperature point and a quasi-ordinate angle compensation coefficient of the test object in the pixel matrix of the temperature sensing sensor is obtained, and the second compensation curve is generated according to the values of the ordinate of the highest temperature point and the quasi-ordinate angle compensation coefficient of a plurality of groups of the same test objects in the pixel matrix of the temperature sensing sensor; and fitting at least one second compensation curve to obtain the second angle compensation model.
In some embodiments of the invention, the quasi-ordinate angle compensation coefficient cpryCalculated according to the following formula:
Figure BDA0002384171140000031
wherein, TcenIs a matrix reference temperature, which is the temperature, T, of the same test object detected by the temperature sensor when the highest temperature point is the center of the pixel matrix of the temperature sensor in the pixel matrix of the temperature sensoryWhen the same test object is in the pixel matrix of the temperature sensor and the ordinate of the highest temperature point is y, the temperature of the same test object is detected by the temperature sensor.
In some embodiments of the invention, the distance compensation factor comprises: a first distance compensation coefficient, wherein a temperature difference of the object to be measured detected by the temperature sensor is reduced when the distance between the object to be measured and the temperature sensor is changed after the first distance compensation coefficient is adopted compared with the uncompensated state, and correspondingly, the distance compensation model at least comprises a first distance compensation model configured to calculate the first distance compensation coefficient; and/or a second distance compensation coefficient, wherein the difference between the temperature of the object to be measured detected by the temperature sensor and the actual temperature of the object to be measured is reduced compared to when the second distance compensation coefficient is not used for compensation, and correspondingly, the distance compensation model at least comprises a second distance compensation model configured to calculate the second distance compensation coefficient.
In some embodiments of the invention, the first distance compensation model is generated by: for at least one test object, acquiring a third compensation curve between the equivalent distance between the test object and the temperature sensing sensor and the quasi-first distance compensation coefficient, wherein the third compensation curve is generated according to a plurality of groups of values of the equivalent distance between the test object and the temperature sensing sensor and the quasi-first distance compensation coefficient; and fitting at least one third compensation curve to obtain the first distance compensation model.
In some embodiments of the invention, the second distance compensation model is generated by: when the detected temperature is closest to the actual temperature of the test object, the equivalent distance between the test object and the temperature-sensing sensor is used as the reference equivalent distance dbase(ii) a And according to the first distance compensation model, taking the ratio of the first distance compensation coefficient to a first reference distance compensation coefficient as the second distance compensation model, wherein the first reference distance compensation coefficient is the equivalent distance between the test object and the temperature sensor and is the reference equivalent distance dbaseThe first distance compensation factor.
In some embodiments of the present invention, the second distance compensation model includes a plurality of sub second distance compensation models, each of the sub second distance compensation models corresponds to a different size parameter range, and the calculating a distance compensation coefficient according to the size parameter of the heat generating surface of the object to be measured and the distance between the object to be measured and the temperature sensing sensor based on the distance compensation model includes: and determining the sub second distance compensation model for calculating the second distance compensation coefficient of the object to be measured according to the matching of the size parameter of the heating surface of the object to be measured and the size parameter range corresponding to each sub second distance compensation model.
In some embodiments of the present invention, the calculating a distance compensation coefficient according to a size parameter of a heat generating surface of the object to be measured and a distance between the object to be measured and the temperature sensing sensor based on the distance compensation model includes: and calculating the equivalent distance between the object to be tested and the temperature-sensing sensor according to the size parameter of the heating surface of the object to be tested and the distance between the object to be tested and the temperature-sensing sensor, wherein the calculation mode of the equivalent distance between the object to be tested and the temperature-sensing sensor is the same as the calculation mode of the equivalent distance between the object to be tested and the temperature-sensing sensor.
In some embodiments of the invention, the equivalent distance deqCalculated according to the following formula:
Figure BDA0002384171140000041
wherein d isrealIs the actual distance between the test object and the temperature-sensitive sensor, dunThe minimum size parameter of the heating surface of the reference test object is Dim, and the size parameter of the heating surface of the test object is Dim.
In some embodiments of the invention, the quasi-first distance compensation coefficient cprd1Calculated according to the following formula:
Figure BDA0002384171140000042
wherein, TdmaxThe actual distance between the test object and the temperature-sensing sensor is dmaxThe temperature of the test object, T, detected by the temperature sensordrealThe actual distance between the test object and the temperature-sensing sensor is drealThe temperature of the test object is detected by the temperature sensor, wherein dmaxIs n times of the minimum size parameter of the heating surface of the test object, and n is the object distance ratio of the temperature-sensing sensor.
In some embodiments of the present invention, the distance compensation factor is a product of the first distance compensation factor and the second distance compensation factor.
In some embodiments of the present invention, the compensated temperature is a product of the temperature of the object to be measured detected by the temperature sensitive sensor, the distance compensation coefficient, and the angle compensation coefficient.
According to still another aspect of the present invention, there is also provided a temperature compensation device for a temperature sensitive sensor, including: the distance compensation calculation module is configured to calculate a distance compensation coefficient according to a size parameter of a heating surface of an object to be measured and a distance between the object to be measured and the temperature sensing sensor based on a distance compensation model; the angle compensation calculation module is configured to calculate an angle compensation coefficient according to the position of the object to be measured in the pixel matrix of the temperature sensing sensor based on an angle compensation model; and a compensation module configured to compensate the temperature of the object to be measured detected by the temperature sensor by using a distance compensation coefficient and/or an angle compensation coefficient to obtain a compensated temperature.
According to still another aspect of the present invention, there is also provided a temperature compensation method of a temperature sensitive sensor, including: calculating a distance compensation coefficient according to the size parameter of the heating surface of the object to be measured and the distance between the object to be measured and the temperature sensing sensor based on a distance compensation model; and compensating the temperature of the object to be detected by the temperature sensing sensor by adopting the distance compensation coefficient to obtain compensated temperature.
According to still another aspect of the present invention, there is also provided a temperature compensation method of a temperature sensitive sensor, including: based on an angle compensation model, calculating an angle compensation coefficient according to the position of the object to be detected in a pixel matrix of the temperature sensor; and compensating the temperature of the object to be detected by the temperature sensing sensor by adopting the angle compensation coefficient to obtain a compensated temperature.
According to still another aspect of the present invention, there is also provided an electronic apparatus, including: a processor; a storage medium having stored thereon a computer program which, when executed by the processor, performs the steps as described above.
According to yet another aspect of the present invention, there is also provided a storage medium having stored thereon a computer program which, when executed by a processor, performs the steps as described above.
Compared with the prior art, the invention has the following advantages:
on one hand, the invention calculates the distance compensation coefficient through the size parameter of the heating surface of the object to be detected and the distance between the object to be detected and the temperature sensor, thereby compensating the influence of the distance between the object to be detected and the temperature sensor on the detected temperature through the distance compensation coefficient; on the other hand, the invention calculates the angle compensation coefficient according to the position of the object to be detected in the pixel matrix of the temperature sensor, thereby compensating the influence of the included angle between the normal line of the lens and the object to be detected on the detected temperature through the angle compensation coefficient. Meanwhile, the invention does not need to detect the included angle between the normal of the temperature sensing sensor lens and the object to be measured by any angle measuring device, because the information of the included angle between the normal of the sensor lens and the object to be measured is already contained in the position of the object to be measured in the pixel matrix of the sensor, thus saving a plurality of troubles and problems of angle measurement. Therefore, the temperature of the object to be measured detected by the temperature sensing sensor is compensated by the distance compensation coefficient and/or the angle compensation coefficient, so that the measurement error is reduced.
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The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.
Fig. 1 shows a flowchart of a temperature compensation method of a temperature sensitive sensor according to an embodiment of the present invention.
FIG. 2 shows a flow diagram for generating a first angle compensation model according to an embodiment of the invention.
Fig. 3 shows a schematic diagram of a pixel matrix of a temperature sensitive sensor according to an embodiment of the present invention.
FIG. 4 shows a schematic diagram of a plurality of first compensation curves according to an embodiment of the invention.
FIG. 5 is a flow chart of generating a second angle compensation model according to an embodiment of the present invention.
Fig. 6 shows a schematic view of different distances between different test objects and the same temperature sensitive sensor according to an embodiment of the present invention.
FIG. 7 is a schematic diagram illustrating a third compensation curve for test objects having different heating surface dimensional parameters according to an embodiment of the present invention.
FIG. 8 shows a flow diagram for generating a first distance compensation model according to an embodiment of the invention.
FIG. 9 shows a flow diagram for generating a second distance compensation model according to an embodiment of the invention.
Fig. 10 is a flowchart illustrating a temperature compensation method of a temperature sensitive sensor according to an embodiment of the present invention.
Fig. 11 shows a schematic diagram of a temperature compensating apparatus of a temperature sensitive sensor according to an embodiment of the present invention.
Fig. 12 schematically illustrates a computer-readable storage medium in an exemplary embodiment of the invention.
Fig. 13 schematically illustrates an electronic device in an exemplary embodiment of the invention.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted. Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities. These functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor devices and/or microcontroller devices.
In order to overcome the defects of the prior art, the invention provides a temperature compensation method and device for a temperature-sensing sensor, electronic equipment and a storage medium, so as to realize the temperature compensation of the temperature-sensing sensor. The temperature compensation method, the temperature compensation device, the electronic equipment and the storage medium of the temperature sensor are preferably suitable for the matrix infrared temperature sensor.
Referring first to fig. 1, fig. 1 illustrates a flowchart of a temperature compensation method of a temperature sensitive sensor according to an embodiment of the present invention. Fig. 1 shows the following steps in total:
step S110: and calculating a distance compensation coefficient according to the size parameter of the heating surface of the object to be measured and the distance between the object to be measured and the temperature sensing sensor based on a distance compensation model. Step S120: and based on an angle compensation model, calculating an angle compensation coefficient according to the position of the object to be detected in the pixel matrix of the temperature sensing sensor. Step S130: and compensating the temperature of the object to be detected by the temperature sensing sensor by adopting a distance compensation coefficient and/or an angle compensation coefficient to obtain a compensated temperature.
The steps S110 and S120 may be executed synchronously, asynchronously or in reverse order, which is not intended to limit the present invention. In step S130 provided in the present invention, the temperature of the object to be measured detected by the temperature sensor may be compensated by using only a distance compensation coefficient to obtain a compensated temperature; the temperature of the object to be measured detected by the temperature sensor may be compensated by using only an angle compensation coefficient to obtain a compensated temperature; the temperature of the object to be measured detected by the temperature sensor may be compensated by using the distance compensation coefficient and the angle compensation coefficient at the same time to obtain a compensated temperature. The invention is not so limited.
In various embodiments of the present invention, the temperature compensation method for a temperature-sensitive sensor may further include the step of obtaining a size parameter of a heating surface of an object to be measured, a distance between the object to be measured and the temperature-sensitive sensor, and a position of the object to be measured in a pixel matrix of the temperature-sensitive sensor. One or more parameters of the size parameter of the heating surface of the object to be measured, the distance between the object to be measured and the temperature-sensitive sensor, and the position of the object to be measured in the pixel matrix of the temperature-sensitive sensor may be obtained through user input, automatic detection calculation of the system, reading from a memory, and the like, which is not limited in the present invention.
In various embodiments of the present invention, the size parameter of the heating surface of the object to be measured is a size parameter of the object to be measured after planarization in the detection range of the temperature sensor. Specifically, since the heating surface of the object may have a three-dimensional shape or the heating surface of the object is inclined with respect to the sensing lens of the temperature sensor, the obtained size parameter of the heating surface of the object needs to be a planarized size parameter. Further, the size parameter of the object to be measured after planarization in the detection range of the temperature sensor refers to the actual size parameter of the object to be measured after planarization, and is not the size parameter of the object to be measured in the pixel matrix of the temperature sensor.
In various embodiments of the present invention, the pixel matrix of the temperature-sensitive sensor refers to a pixel matrix mapped to a detection array in the temperature-sensitive sensor after the detection range of the temperature-sensitive sensor is planarized.
In various embodiments of the present invention, the temperature of the object to be measured detected by the temperature sensitive sensor may be a highest temperature in a pixel matrix of the temperature sensitive sensor, thereby compensating for the highest temperature. For example, the temperature of the object to be measured detected by the temperature sensor may be the temperature of any pixel in the pixel matrix of the temperature sensor, so as to compensate the temperature of any pixel.
In various embodiments of the present invention, the object to be tested and the test objects for generating the distance compensation model and the angle compensation model may be the same or different objects, which is not limited in the present invention. In some preferred embodiments, the present invention can use the same reference test object as the test object to generate more widely applicable distance compensation model, angle compensation model. The reference test object may be a standard black body or an equivalent heat generating body. For example, the reference test object may be a circular heat generating body having a diameter of 10cm, and the size of the reference test object is not limited thereto.
In the temperature compensation method of the temperature sensing sensor provided by the invention, on one hand, the distance compensation coefficient is calculated according to the size parameter of the heating surface of the object to be detected and the distance between the object to be detected and the temperature sensing sensor, so that the influence of the distance between the object to be detected and the temperature sensing sensor on the detected temperature is compensated through the distance compensation coefficient; on the other hand, the invention calculates the angle compensation coefficient through the position of the highest temperature point of the object to be detected in the pixel matrix of the temperature sensing sensor, thereby compensating the influence of the included angle between the normal line of the lens of the temperature sensing sensor and the object to be detected on the detected temperature through the angle compensation coefficient. Meanwhile, the invention does not need to detect the included angle between the normal of the temperature sensing sensor lens and the object to be measured by any angle measuring device, because the information of the included angle between the normal of the sensor lens and the object to be measured is already contained in the position of the object to be measured in the sensor pixel matrix, thereby saving a plurality of troubles and problems of angle measurement. Therefore, the temperature of the object to be measured detected by the temperature sensing sensor is compensated by the distance compensation coefficient and/or the angle compensation coefficient, so that the measurement error is reduced.
According to the temperature measurement principle of the infrared sensor such as Planck's radiation law, the invention easily knows that the electric signal/temperature value output by the infrared temperature sensor is the integral result of the heat radiation of the object to be measured in the wavelength range sensitive by the temperature sensor, and is inversely proportional to the distance d between the object to be measured and the temperature sensor and inversely proportional to the rotation angle theta of the temperature sensor, and can be approximately expressed by the following formula:
V＝f(Tobj，d，θ)
v is a temperature sensor electrical signal or a temperature value converted by radiation of an object To be detected, d is a linear distance between a field angle center of the temperature sensor and a center of a heating surface of the object To be detected, theta is an included angle between a lens normal of the temperature sensor and the heating surface of the object To be detected, and TobjIs the surface temperature of the object to be measured.
Therefore, according to the temperature measurement principle and formula of the infrared sensor, the temperature of the object to be measured detected by the temperature sensing sensor is influenced by the distance between the object to be measured and the sensor and the included angle between the normal line of the lens of the temperature sensing sensor and the object to be measured. In order to reduce the distance between an object to be measured and a sensor and the included angle between the normal line of a lens of a temperature sensor and the object to be measured, the temperature of the object to be measured detected by the temperature sensor is compensated by a distance compensation coefficient and/or an angle compensation coefficient, so that the measurement error is reduced.
The calculation of the angle compensation coefficient and the generation of the angle compensation model provided by the present invention are described below. Specifically, for the matrix-type multi-pixel infrared temperature sensor, the row direction of the pixel matrix of the temperature sensor may be set as the abscissa direction, and the column direction of the pixel matrix of the temperature sensor may be set as the ordinate direction. The position of the object to be measured in the pixel matrix of the temperature sensor can be represented by the coordinate of the highest temperature of the object to be measured in the pixel matrix of the temperature sensor. The abscissa angle compensation coefficient and the ordinate angle compensation coefficient can be respectively calculated by the abscissa of the object to be detected at the highest temperature in the pixel matrix of the temperature sensing sensor, so that the product of the abscissa angle compensation coefficient and the ordinate angle compensation coefficient is used as the angle compensation coefficient to reduce the influence of the included angle between the lens normal of the temperature sensing sensor and the object to be detected on the temperature of the object to be detected by the temperature sensing sensor.
In the above embodiment, the angle compensation model may include a first angle compensation model configured to calculate the abscissa angle compensation coefficient and a second angle compensation model configured to calculate the ordinate angle compensation coefficient.
FIG. 2 shows a flow diagram for generating a first angle compensation model according to an embodiment of the invention. Fig. 2 shows the following steps together: step S210: for at least one temperature sensing sensor with the same model, for the same test object, when the distance between the test object and the temperature sensing sensor is unchanged, and the test object is in a pixel matrix of the temperature sensing sensor, and the ordinate of the highest temperature point is unchanged, a first compensation curve between the abscissa of the highest temperature point and the quasi-abscissa angle compensation coefficient of the test object in the pixel matrix of the temperature sensing sensor is obtained, and the first compensation curve is generated according to the values of the abscissa of the highest temperature point and the quasi-abscissa angle compensation coefficient of a plurality of groups of the same test object in the pixel matrix of the temperature sensing sensor. Step S220: and fitting at least one first compensation curve to obtain the first angle compensation model.
Specifically, in a preferred embodiment, the step S210 may further enable the ordinate of the highest temperature point in the pixel matrix of the temperature-sensitive sensor to be maintained at the center of the ordinate (two central points or one central point), so as to improve the accuracy of the first angle model. In a preferred embodiment, when the test object is a standard black body or an equivalent heating body (for example, a circular heating body having a diameter of 10 cm), the distance between the test object and the temperature-sensitive sensor is maintained to be n times of the minimum size parameter (for example, the diameter thereof) of the heating surface of the test object in step S210, and n is the object distance ratio of the temperature-sensitive sensor.
In the above embodiment, the quasi-abscissa angle compensation coefficient cprxCalculated according to the following formula:
Figure BDA0002384171140000101
wherein, TcenIs a matrix reference temperature, which is the temperature, T, of the same test object detected by the temperature sensor when the highest temperature point is the center of the pixel matrix of the temperature sensor in the pixel matrix of the temperature sensorxWhen the same test object is in the pixel matrix of the temperature sensor and the abscissa of the highest point of temperature is x, the temperature sensor detects the temperature of the same test object. Specifically, according to theoretical analysis, when the highest temperature point is the center of the pixel matrix, it can be considered that an included angle between a lens normal of the temperature sensor and a heating surface of the object to be tested is 0 °, and thus when the highest temperature point is the center of the pixel matrix, the temperature T of the same test object detected by the temperature sensor is detected by the temperature sensorcenClosest to the true temperature of the test object. The center of the pixel matrix may refer to a center point or a center matrix of the pixel matrix. For example, for a pixel matrix of N rows and M columns: if N and M are both odd numbers, the center of the pixel matrix can be the center point of the pixel matrix, and the center point is located at the (N +1)/2 th row and the (M +1)/2 nd row; if N and M are both even numbers, the center of the pixel matrix may be a center matrix (2 rows and 2 columns, the invention is not limited thereto) of the pixel matrix, and four points of the center matrix are respectively located at (N/2+1) th row, (M/2+1) th row, (N/2+1) th row, (M/2-1) th row, (N/2-1) th row, and (M/2-1) th row; if one of N and M is an even number, the center of the pixel matrix may be the center matrix of the pixel matrix (2 rows and 1 column or 1 row and 2 columns, which is not limited by the present invention), and the positions of the two points thereof may refer to the above description, which is not repeated herein.
FIG. 5 shows a flow chart for generating a second angle compensation model according to an embodiment of the invention. Fig. 5 shows the following steps in total: step S310: for at least one temperature sensing sensor with the same model, when the distance between the test object and the temperature sensing sensor is unchanged and the abscissa of the highest temperature point of the test object in the pixel matrix of the temperature sensing sensor is unchanged, a second compensation curve between the ordinate of the highest temperature point and the quasi-ordinate angle compensation coefficient of the test object in the pixel matrix of the temperature sensing sensor is obtained, and the second compensation curve is generated according to the values of the ordinate of the highest temperature point and the quasi-ordinate angle compensation coefficient of a plurality of groups of the same test objects in the pixel matrix of the temperature sensing sensor. Step S320: and fitting at least one second compensation curve to obtain the second angle compensation model.
Specifically, in a preferred embodiment, the step S310 may further enable the ordinate of the highest temperature point in the pixel matrix of the temperature sensing sensor to be maintained at the center of the abscissa (two central points or one central point), so as to improve the accuracy of the second angle model. In a preferred embodiment, when the test object is a standard black body or an equivalent heating element (for example, a circular heating element having a diameter of 10 cm), the distance between the test object and the temperature-sensitive sensor is maintained to be n times the minimum size parameter (for example, the diameter thereof) of the heating surface of the test object in step S310, and n is the object distance ratio of the temperature-sensitive sensor.
In the above embodiment, the quasi-ordinate angle compensation coefficient cpryCalculated according to the following formula:
Figure BDA0002384171140000111
wherein, TcenIs a matrix reference temperature, which is the temperature, T, of the same test object detected by the temperature sensor when the highest temperature point is the center of the pixel matrix of the temperature sensor in the pixel matrix of the temperature sensoryWhen the same test object is in the pixel matrix of the temperature sensor and the ordinate of the highest temperature point is y, the temperature of the same test object is detected by the temperature sensor. Specifically, according to theoretical analysis, when the highest temperature point is the center of the pixel matrix, it can be considered that an included angle between a lens normal of the temperature sensor and a heating surface of the object to be tested is 0 °, and thus when the highest temperature point is the center of the pixel matrix, the temperature T of the same test object detected by the temperature sensor is detected by the temperature sensorcenClosest to the true temperature of the test object.
See fig. 3 and 4. Fig. 3 shows a schematic diagram of a pixel matrix of a temperature sensitive sensor according to an embodiment of the present invention. FIG. 4 shows a schematic diagram of a plurality of first compensation curves according to an embodiment of the invention.
For a temperature-sensitive sensor, a coordinate system as shown in fig. 3 is established with the lower right corner of the pixel matrix of the temperature-sensitive sensor as the origin of coordinates. The x-axis represents the horizontal coordinate of the imaging position of the object to be measured on the pixel matrix of the temperature sensor, and the y-axis represents the vertical coordinate of the imaging position of the object to be measured on the pixel matrix of the temperature sensor. The horizontal and vertical coordinates of the imaging position of the object to be measured on the pixel matrix of the temperature sensing sensor can represent the included angle theta between the normal of the sensor lens and the target object. In the embodiment shown in fig. 3, the size of the pixel matrix of the temperature sensing sensor is 32 × 24 pixels. The present invention is not limited thereto, and the temperature sensing sensors of different types may have pixel matrices of different sizes according to hardware parameters thereof.
According to the above theoretical analysis, in the present embodiment, when the abscissa x of the imaging position of the object to be measured on the pixel matrix of the temperature sensing sensor is 16, 17; and when the ordinate y is 12,13, the included angle between the temperature sensing sensor and the heating surface of the object to be measured in the horizontal and vertical directions of the pixel array can be regarded as 0 °, and the error of the temperature value measured by the temperature sensing sensor is minimum at this time.
The x and y coordinates of the object to be measured in the pixel matrix coordinate system of the temperature sensor can indicate the included angle between the lens normal of the temperature sensor and the object to be measured in the horizontal direction and the vertical direction. In order to obtain temperature compensation values measured by temperature sensors at different angles, in the present example, an experiment was performed at a sensor object distance ratio of 40cm with a circular heating element having a diameter of 10cm as a test object. When the test object is located at the center of the temperature sensor (x is 16,17y is 12,13), the temperature value measured by the temperature sensor is used as the matrix reference temperature, and the obtained quotient can be used as a quasi-compensation coefficient to compensate the measurement result of the temperature sensor at different angles by dividing the matrix reference temperature by the measured temperature values at different coordinates.
By rotating the temperature-sensing sensor left and right in the horizontal direction, the included angle between the normal of the lens of the temperature-sensing sensor and the test object in the horizontal direction is continuously adjusted, so that the abscissa value of the test object in the pixel matrix coordinate system of the temperature-sensing sensor is changed from small to large (or vice versa), the ordinate value of the test object in the pixel matrix coordinate system is ensured to be kept at the central position (y is 12 and 13), and the quasi-abscissa angle compensation coefficient under each abscissa value at the moment is recorded:
Figure BDA0002384171140000121
wherein, TcenIs matrix reference temperature, the matrix reference temperature is the temperature sensing temperature when the same test object is in the pixel matrix of the temperature sensing sensor and the highest temperature point is the center of the pixel matrixTemperature, T, of the same test object detected by the sensorxWhen the same test object is in the pixel matrix of the temperature sensor and the abscissa of the highest point of temperature is x, the temperature sensor detects the temperature of the same test object.
By rotating the temperature sensor up and down in the vertical direction, the included angle between the normal of the lens of the temperature sensor and the target object in the vertical direction is continuously adjusted, so that the ordinate value of the test object in the pixel matrix coordinate system of the temperature sensor is changed from small to large (or vice versa), the abscissa value of the test object in the pixel matrix coordinate system is ensured to be kept at the central position (x is 16,17), and the quasi-ordinate angle compensation coefficient under each ordinate value at the time is recorded:
Figure BDA0002384171140000131
wherein, TcenIs a matrix reference temperature, which is the temperature, T, of the same test object detected by the temperature sensor when the highest temperature point is the center of the pixel matrix of the temperature sensor in the pixel matrix of the temperature sensoryWhen the same test object is in the pixel matrix of the temperature sensor and the ordinate of the highest temperature point is y, the temperature of the same test object is detected by the temperature sensor.
Table 1 shows the average peak temperature and the corresponding quasi-abscissa angle compensation coefficient obtained by repeating the above experiment 3 times for 3 temperature sensors of the same type under the same experimental conditions and for the same abscissa value.
TABLE 1 summary of horizontal compensation data
Figure BDA0002384171140000132
Figure BDA0002384171140000141
As can be seen from the data analysis in table 1, the three temperature sensors have good consistency of experimental data, so that the quasi-abscissa angle compensation coefficients corresponding to different abscissa values of the three temperature sensors in table 1 are averaged, and data fitting is performed to draw a curve as shown in fig. 4. Fig. 4 shows three first compensation curves, from which an average compensation curve is generated from the average values of the last column of table 1, and is fitted to generate a first angle compensation model. In fig. 4, the x-axis is the value of the abscissa of the test object in the pixel matrix of the temperature sensor, and the y-axis is the quasi-abscissa angle compensation coefficient.
In this embodiment, the first angle compensation model is obtained as c (x). Wherein, c (x) is an abscissa angle compensation coefficient, and x is an abscissa value of the object to be measured in the pixel matrix of the temperature sensor.
The second angle compensation model c (y) can also be obtained using the same method. Wherein, c (y) is a vertical coordinate angle compensation coefficient, and y is a value of a vertical coordinate of the object to be measured in the pixel matrix of the temperature sensor.
For any point of the object to be measured imaged in the coordinate system of the pixel matrix of the temperature sensor, the coordinate is (x, y), and the angle compensation coefficient c (x, y) can be calculated by the following formula:
c(x，y)＝c(x)×c(y)
in other embodiments of the present invention, an included angle between a lens normal of the temperature sensing sensor and the object to be measured may also be determined by a ratio of a distance between a horizontal coordinate and a vertical coordinate of the object to be measured in the pixel matrix of the temperature sensing sensor and a center of the pixel matrix, and a distance between the object to be measured and the temperature sensing sensor, and the angle compensation model may be obtained in a similar manner as described above according to a functional relationship (for example, in a fitting manner) between the obtained included angle and the quasi-angle compensation coefficient. Wherein, the quasi-angle compensation coefficient cprθFor example, it may be:
Figure BDA0002384171140000142
wherein, TcenIs a matrix reference temperature, which is the same test pairWhen the highest point of temperature is the center of the pixel matrix like in the pixel matrix of the temperature sensor, the temperature sensor detects the temperature, T, of the same test objectθWhen the included angle between the normal line of the lens of the temperature sensor and the object to be tested is theta, the temperature sensor detects the temperature of the same test object.
In addition, through experimental tests, the first angle compensation model and the second angle compensation model obtained by the compensation method provided by the invention have applicability in a certain temperature range. Therefore, the first angle compensation model and the second angle compensation model can be generated only according to the test object under a certain temperature, so that the method is suitable for compensating the detection of the test object in a certain temperature range.
Further, according to the foregoing principle, only by the angle compensation coefficient, the distance between the object to be measured and the temperature sensing sensor still affects the detected temperature. In order to reduce or eliminate this effect as much as possible, the distance compensation coefficients provided by the present invention may comprise a first distance compensation coefficient and/or a second distance compensation coefficient. Compared with the uncompensated state, after the first distance compensation coefficient is adopted, when the distance between the object to be detected and the temperature sensing sensor changes, the temperature difference value of the object to be detected, which is detected by the temperature sensing sensor, is reduced. In other words, the temperature difference of the object to be measured detected by the temperature sensor approaches 0 regardless of the distance between the object to be measured and the temperature sensor. Correspondingly, the distance compensation model comprises at least a first distance compensation model configured to calculate the first distance compensation coefficient. And compared with the uncompensated state, after the second distance compensation coefficient is adopted, the difference between the temperature of the object to be detected by the temperature sensing sensor and the actual temperature of the object to be detected is reduced. In other words, regardless of the distance between the object to be measured and the temperature sensing sensor, the difference between the temperature of the object to be measured detected by the temperature sensing sensor and the actual temperature of the object to be measured approaches 0, and thus, the second distance compensation coefficient can be used to calibrate the detected temperature. Correspondingly, the distance compensation model comprises at least a second distance compensation model configured to calculate the second distance compensation coefficient.
When the first distance compensation model and/or the second distance compensation model are/is obtained, the distance between the object to be measured and the temperature sensing sensor may be normalized first. Specifically, according to the foregoing principle, the electric signal output by the temperature sensor and the distance d are in a negative correlation relationship, and the electric signal output by the sensor is a result of integrating the heat radiation of the object entering the sensor lens area in the wavelength range sensitive to the light, so that it can be known that the object to be measured having the heating surfaces with different size parameters, the distance between the object to be measured and the temperature sensor can be normalized within the range of the object distance ratio of the sensor. To achieve the normalization process, the present invention provides the concept of equivalent distance. Equivalent distance deqCalculated according to the following formula:
Figure BDA0002384171140000151
wherein d isrealIs the actual distance between the test object and the temperature-sensitive sensor, dunThe minimum dimension parameter of the heat emitting surface of the reference test object (if a reference test object having a circular heat emitting surface is used, the minimum dimension parameter of the heat emitting surface is the diameter thereof), Dim is the dimension parameter of the heat emitting surface of the test object. The meaning of the benchmark test object is described above and is not repeated herein.
Referring now to fig. 6, fig. 6 is a schematic diagram illustrating different distances between different test objects and the same temperature sensitive sensor according to an embodiment of the present invention.
The dimensional parameters of the heat-generating surface of the test object include the length (L) and the width (W) of the heat-generating surface of the test object facing the temperature-sensitive sensor after planarization in the detection range of the temperature-sensitive sensor (likewise, the object to be tested includes the length (L) and the width (W) of the heat-generating surface of the test object facing the temperature-sensitive sensor after planarization in the detection range of the temperature-sensitive sensor). The equivalent distance refers to the temperature detected by a temperature sensor with a distance d from a test object with a certain size parameter of a heating surface and the distance from a reference test objectIs separated by deqThe temperature detected by the temperature sensitive sensor of (1) is approximately equivalent. deqReferred to as an equivalent distance between a test object having a dimensional parameter of the heat generating surface and the temperature sensitive sensor.
If a test object of a standard black body or an equivalent heating element (for example, a circular heating element having a diameter of 10 cm) is used as a reference test object, the equivalent distance d between the test object and the temperature sensor having different size parameters of the heating surfaceeqSatisfies the following formula
Figure BDA0002384171140000161
In correspondence with fig. 6, when a test object having a diameter of 10cm is taken as a reference test object, and when a distance between the reference test object and the temperature sensitive sensor is 160cm for a test object having a height of 40cm and a width of 60cm, it corresponds to a distance between the reference test object and the temperature sensitive sensor of 40cm, and therefore, when a distance between the test object having a heat generating surface height of 40cm and a width of 60cm is 160cm, an equivalent distance therebetween is 40 cm. Similarly, when the test object having a heat generating surface height of 80cm and a width of 120cm is at a distance of 320cm from the temperature sensor, this corresponds to a distance of 40cm from the reference test object and the temperature sensor, and therefore, when the test object having a heat generating surface height of 80cm and a width of 120cm is at a distance of 320cm from the temperature sensor, the equivalent distance therebetween is 40 cm. The calculation mode of the equivalent distance between the object to be tested and the temperature-sensing sensor is the same as the calculation mode of the equivalent distance between the object to be tested and the temperature-sensing sensor.
After distance normalization, see fig. 8. FIG. 8 shows a flow diagram for generating a first distance compensation model according to an embodiment of the invention. Fig. 8 shows the following steps:
step S410: and for at least one test object, acquiring a third compensation curve between the equivalent distance between the test object and the temperature sensing sensor and the quasi-first distance compensation coefficient, wherein the third compensation curve is generated according to a plurality of groups of values of the equivalent distance between the test object and the temperature sensing sensor and the quasi-first distance compensation coefficient. Step S420: and fitting at least one third compensation curve to obtain the first distance compensation model.
In a preferred embodiment, step S410 may obtain a third compensation curve using only one of the aforementioned reference test objects, so that the first distance compensation model is obtained according to only one third compensation curve fitting in step S420. In the preferred embodiment, considering that the objects to be tested with the other sizes are equivalent to the reference test object so as to obtain the equivalent distance, the first distance compensation model suitable for various objects to be tested can be obtained only by adopting the reference test object to obtain the third compensation curve, so that the temperatures corresponding to other test objects with different sizes and different test distances do not need to be additionally measured.
In a specific embodiment, to obtain the first distance compensation model. The temperature of the test object can be set to 80 ℃ while keeping the sensing sensor facing the test object in the horizontal and vertical directions (the invention is not limited), and the actual distance d between the temperature sensing sensor and the test object can be continuously adjustedrealLet the actual distance drealThe value varies from small to large, and a quasi-first distance compensation coefficient is calculated. Quasi first distance compensation coefficient cprd1Calculated according to the following formula:
Figure BDA0002384171140000171
wherein, TdmaxThe actual distance between the test object and the temperature-sensing sensor is dmaxThe temperature of the test object, T, detected by the temperature sensordrealThe actual distance between the test object and the temperature-sensing sensor is drealThe temperature of the test object is detected by the temperature sensor, wherein dmaxN is n times of the minimum size parameter of the heating surface of the test object, and n is the object distance ratio of the temperature sensing sensor (in the embodiment, the object distance ratio is 1: 4, the invention is not limited). When the test object is the aforementioned reference test object, dmaxIs n times the diameter of the reference test object.
Actual distance d of recordingrealQuasi-first distance compensation coefficient cprd1And the average maximum temperature (average maximum temperature obtained by performing a plurality of detections at the same distance of the same test object, in degrees celsius) is shown in table 2.
TABLE 2 quasi-first distance compensation coefficients for different distances
Figure BDA0002384171140000172
Figure BDA0002384171140000181
Three third compensation curves were obtained according to the three test subjects of table 2 (heat sources with different heat generation surface size parameters), as shown in fig. 7. FIG. 7 shows a schematic illustration of a third compensation curve for test objects with different dimensional parameters of the heat emitting surface according to an embodiment of the invention. In fig. 7, the x-axis of the third compensation curve is the equivalent distance between the test object and the temperature sensor, and the y-axis is the first distance compensation coefficient. The first distance compensation model may be obtained from fitting only the third compensation curve of the reference test object (the circular heat-generating body having a diameter of 10 cm). The third compensation curves of the test objects with the rest sizes are almost overlapped with the first distance compensation model obtained by fitting, so that the first distance compensation model obtained by only adopting the reference test object can be suitable for various types of objects to be tested with different sizes.
In this embodiment, the first distance compensation model may be obtained by fitting a third compensation curve of the middle reference test object of fig. 7:
c(d)＝adeq b
wherein c (d) is a first distance compensation coefficient, deqAnd a and b are parameters obtained according to the fitting of a third compensation curve respectively. Thus, in step S120 shown in fig. 1, a distance compensation model is used based on the size parameter of the heat generating surface of the object and the distance between the object and the temperature sensorCalculating the distance compensation coefficient includes: and calculating the equivalent distance between the object to be measured and the temperature-sensing sensor according to the size parameter of the heating surface of the object to be measured and the distance between the object to be measured and the temperature-sensing sensor.
The data fitting curve used here is a power function about the distance, because although the distance between any object to be measured and the sensor can be equivalent to the range of the object distance ratio of the sensor by a distance normalization method, in practical use, an application situation that the distance is very close to a target object or exceeds the range of the object distance ratio may occur, the power function can just reflect the change rule, and the first distance compensation coefficient calculated by the first distance compensation model does not increase significantly with the increase of the distance d; with the reduction of the distance, the first distance compensation coefficient calculated by the first distance compensation model is not reduced remarkably, and the relationship between the output of the sensor and the distance is basically analyzed according to the theory of the invention.
FIG. 9 shows a flow diagram for generating a second distance compensation model according to an embodiment of the invention. Fig. 9 shows the following steps:
step S510: when the detected temperature is closest to the actual temperature of the test object, the equivalent distance between the test object and the temperature-sensing sensor is used as the reference equivalent distance dbase. Step S520: according to the first distance compensation model, taking the ratio of the first distance compensation coefficient to a first reference distance compensation coefficient as the second distance compensation model, wherein the first reference distance compensation coefficient is the equivalent distance between the test object and the temperature sensor and is the reference equivalent distance dbaseThe first distance compensation factor.
In the embodiment shown in table two, the second distance compensation model is:
dcal＝(adeq b)/(adbase b)＝(deq/dbase)b
wherein d iscalIs a second distance compensation coefficient, deqIs the equivalent distance between the object to be measured and the temperature-sensitive sensor, dbaseIs the reference equivalent distance. Reference equivalent distance dbaseAccording to the size parameters of the heating surfaces of different objects to be measured. Specifically, the second distance compensation model includes a plurality of sub second distance compensation models (reference equivalent distances d of different sub second distance compensation models)baseDifferent), each sub-second distance compensation model corresponds to a different size parameter range, and the calculating of the distance compensation coefficient according to the size parameter of the heating surface of the object to be measured and the distance between the object to be measured and the temperature sensor based on the distance compensation model may further include the steps of: and determining the sub second distance compensation model for calculating the second distance compensation coefficient of the object to be measured according to the matching of the size parameter of the heating surface of the object to be measured and the size parameter range corresponding to each sub second distance compensation model.
In the specific embodiment shown in table 2, when the shortest side distance of the test object after planarization in the detection range of the temperature sensor is less than or equal to 40cm and the actual measurement distance of the sensor is less than or equal to 160cm, the temperature measured by the temperature sensor at the equivalent distance of 20cm is closest to the true value of 80 ℃; when the shortest side distance of the test object after planarization in the detection range of the temperature sensor is 80cm and the actual measurement distance of the temperature sensor is 320cm, the temperature measured by the temperature sensor at the equivalent distance of 5cm is closest to the true value of 80 ℃. Therefore, when the shortest side distance of the object to be detected in the detection range of the temperature-sensitive sensor after planarization is less than or equal to 40cm, the d in the matched sub-second distance compensation modelbaseIs 20 cm; d in the matched sub-second distance compensation model when the shortest side distance of the object to be detected in the detection range of the temperature sensor after planarization is more than or equal to 40cmbaseIs 5 cm. The foregoing is merely an example of the present invention and is not intended to limit the invention thereto. Specifically, dbaseThe parameter can be determined through experiments or calculation and the like and serves as a preset adjustable parameter, and the parameter can be written into a program of a product to be called by a temperature compensation method of the temperature sensing sensor or acquired in a similar mode. Further, dbaseIs a preset obtained by automatic calculation of the system or manually set by a userAnd (4) parameters. dbaseFor example, the present invention may be stored in a storage medium such as a Read Only Memory (ROM), an erasable programmable read only memory (EPROM or flash memory), an optical storage device, a magnetic storage device, and the like, but is not limited thereto. In some embodiments of the invention, the distance compensation factor is a product of the first distance compensation factor and the second distance compensation factor.
In some embodiments of the invention, the compensated temperature is a product of the temperature of the object to be measured detected by the temperature-sensitive sensor, the distance compensation coefficient and the angle compensation coefficient.
The above schematically describes several implementations of the present invention, which may be implemented individually or in combination, and the parameters of the models are not limited thereto.
One specific implementation of the present invention is described below in conjunction with fig. 10. Fig. 10 shows the following steps in total:
step S610: and acquiring the size parameter of the heating surface of the object to be measured and the distance between the object to be measured and the temperature sensing sensor.
Step S620: and judging whether to start compensation or not according to a first preset condition.
Specifically, the first preset condition determines whether the distance between the object to be measured and the temperature sensor is long enough through the initial temperature of the object to be measured sensed by the temperature sensor, the temperature of each pixel point in the pixel matrix of the temperature sensor, and the like, so that a measurement error may exist. It is understood that if the distance between the object to be measured and the temperature-sensitive sensor is very close, the influence of the distance and the angle on the measurement result is very small, and therefore, in this case, it can be considered that the compensation is not necessary.
In one embodiment, when the initial temperature of the object to be measured sensed by the temperature-sensitive sensor is greater than a1The temperature difference value of each pixel point in the pixel matrix of the temperature-sensing sensor is maximally greater than a2The temperature of the pixel matrix of the temperature sensor is higher than a preset threshold value, and the number of the pixel points is less than or equal to a3% of the total amount of the components in the sample, the distance between the object to be measured and the temperature sensor is far enoughAnd thus it is considered that temperature compensation is required in this case. Wherein, a1For example, it may be 40-55, a2For example, it may be 5-20, a3For example, it may be 10-30. The first preset condition is only schematically described above, and the above determination conditions, combinations of the determination conditions, and ranges of the parameters are not limited thereto.
If the determination in step S620 is no, step S630 is executed, and temperature compensation is not performed. In other words, step S630 outputs the temperature detected by the temperature sensitive sensor as the compensated temperature.
If the determination in step S620 is yes, step S640 is executed to calculate a distance compensation coefficient according to the size parameter of the heating surface of the object to be measured and the distance between the object to be measured and the temperature sensor based on the distance compensation model. The calculation method can refer to the foregoing embodiments, and is not described herein.
Step S650 determines whether to start angle compensation according to a second preset condition.
Specifically, the second preset condition of step S650 determines whether angle compensation is required according to the position of the object to be measured in the pixel matrix of the temperature sensor.
Specifically, if the object to be measured is located at the center of the pixel matrix of the temperature sensor, the influence of the angle on the detection result is small, and angle compensation is not required. Thus, when the determination in step S650 is no, step S660 is performed: the product of the detected temperature and the distance compensation coefficient is taken as the compensated temperature. The step S660 is not limited thereto, for example, the step S660 may use a product of the detected temperature and the first distance compensation coefficient as the compensated temperature. For another example, step S660 may use the product of the detected temperature and the second distance compensation coefficient as the compensated temperature.
If the determination in step S650 is yes, step S670 is executed to calculate an angle compensation coefficient according to the position of the object to be measured in the pixel matrix of the temperature sensor based on the angle compensation model. The calculation method can refer to the foregoing embodiments, and is not described herein.
Step S670 is followed by step S680 of taking the detected temperature as a compensated temperature by multiplying the distance compensation coefficient and the angle compensation coefficient.
Fig. 10 is a schematic diagram illustrating only one embodiment of the present invention, and the present invention is not limited thereto, and the steps in fig. 10 are divided, combined, added, omitted, or otherwise changed without departing from the spirit of the present invention.
According to another aspect of the present invention, the present invention further provides a temperature compensation method for a temperature sensitive sensor, including the steps of: calculating a distance compensation coefficient according to the size parameter of the heating surface of the object to be measured and the distance between the object to be measured and the temperature sensing sensor based on a distance compensation model; and compensating the temperature of the object to be detected by the temperature sensing sensor by adopting the distance compensation coefficient to obtain compensated temperature. The calculation method of the distance compensation model and the distance compensation coefficient may adopt any combination of the foregoing embodiments or embodiments, which is not described herein again. Therefore, the distance compensation coefficient is calculated according to the size parameter of the heating surface of the object to be measured and the distance between the object to be measured and the temperature sensing sensor, so that the influence of the distance between the object to be measured and the temperature sensing sensor on the detected temperature is compensated through the distance compensation coefficient.
According to another aspect of the present invention, there is also provided a temperature compensation method for a temperature sensitive sensor, including the steps of: based on an angle compensation model, calculating an angle compensation coefficient according to the coordinate of the highest temperature point of the object to be measured in the pixel matrix of the temperature sensing sensor; and compensating the temperature of the object to be detected by the temperature sensing sensor by adopting the angle compensation coefficient to obtain a compensated temperature. The calculation method of the angle compensation model and the angle compensation coefficient may adopt any combination of the foregoing embodiments or embodiments, which is not described herein again. Therefore, the angle compensation coefficient is calculated according to the position of the object to be detected in the pixel matrix of the temperature sensing sensor, so that the influence of the included angle between the normal line of the lens of the temperature sensing sensor and the object to be detected on the detected temperature is compensated through the angle compensation coefficient. Meanwhile, the invention does not need to detect the included angle between the normal of the temperature sensing sensor lens and the object to be measured by any angle measuring device, because the information of the included angle between the normal of the sensor lens and the object to be measured is already contained in the position of the object to be measured in the sensor pixel matrix, thereby saving a plurality of troubles and problems of angle measurement.
The present invention also provides a temperature compensation device of a temperature sensor, as shown in fig. 11. The temperature-sensing sensor temperature compensation apparatus 700 includes a distance compensation calculation module 710, an angle compensation calculation module 720, and a compensation module 730.
The distance compensation calculating module 710 is configured to calculate a distance compensation coefficient according to a size parameter of a heating surface of the object to be measured and a distance between the object to be measured and the temperature sensing sensor based on a distance compensation model. The angle compensation calculating module 720 is configured to calculate an angle compensation coefficient according to the coordinate of the highest temperature point of the object to be measured in the pixel matrix of the temperature sensing sensor based on an angle compensation model. The compensation module 730 is configured to compensate the temperature of the object to be measured detected by the temperature sensing sensor by using a distance compensation coefficient and/or an angle compensation coefficient to obtain a compensated temperature.
In the temperature compensation device of the temperature sensing sensor, on one hand, the distance compensation coefficient is calculated according to the size parameter of the heating surface of the object to be detected and the distance between the object to be detected and the temperature sensing sensor, so that the influence of the distance between the object to be detected and the temperature sensing sensor on the detected temperature is compensated through the distance compensation coefficient; on the other hand, the invention calculates the angle compensation coefficient through the position of the highest temperature point of the object to be detected in the pixel matrix of the temperature sensing sensor, thereby compensating the influence of the included angle between the normal line of the lens of the temperature sensing sensor and the object to be detected on the detected temperature through the angle compensation coefficient. Meanwhile, the invention does not need to detect the included angle between the normal of the temperature sensing sensor lens and the object to be measured by any angle measuring device, because the information of the included angle between the normal of the sensor lens and the object to be measured is already contained in the position of the object to be measured in the sensor pixel matrix, thereby saving a plurality of troubles and problems of angle measurement. Therefore, the temperature of the object to be measured detected by the temperature sensing sensor is compensated by the distance compensation coefficient and/or the angle compensation coefficient, so that the measurement error is reduced.
Fig. 11 is a schematic diagram of the temperature compensation device 700 of the temperature-sensitive sensor according to the present invention, and the detachment, combination, and addition of the modules are within the scope of the present invention without departing from the spirit of the present invention. The temperature compensation device 700 of the temperature sensor according to the present invention can be implemented by software, hardware, firmware, plug-in, or any combination thereof, and the present invention is not limited thereto.
In an exemplary embodiment of the present invention, there is also provided a computer-readable storage medium having stored thereon a computer program which, when executed by, for example, a processor, can implement the steps of the temperature compensation method of the temperature-sensitive sensor in any one of the above-described embodiments. In some possible embodiments, the various aspects of the present invention may also be embodied in the form of a program product including program code for causing a terminal device to perform the steps according to the various exemplary embodiments of the present invention described in the temperature-sensitive sensor temperature compensation method section of this specification, when the program product is run on the terminal device.
Referring to fig. 12, a program product 800 for implementing the above method according to an embodiment of the present invention is described, which may employ a portable compact disc read only memory (CD-ROM) and include program code, and may be run on a terminal device, such as a personal computer. However, the program product of the present invention is not limited in this regard and, in the present document, a readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
In an exemplary embodiment of the invention, there is also provided an electronic device that may include a processor and a memory for storing executable instructions of the processor. Wherein the processor is configured to perform the steps of the temperature compensation method of the temperature sensitive sensor in any of the above embodiments via execution of the executable instructions.
As will be appreciated by one skilled in the art, aspects of the present invention may be embodied as a system, method or program product. Thus, various aspects of the invention may be embodied in the form of: an entirely hardware embodiment, an entirely software embodiment (including firmware, microcode, etc.) or an embodiment combining hardware and software aspects that may all generally be referred to herein as a "circuit," module "or" system.
An electronic device 900 according to this embodiment of the invention is described below with reference to fig. 13. The electronic device 900 shown in fig. 13 is only an example and should not bring any limitations to the function and scope of use of the embodiments of the present invention.
As shown in fig. 13, the electronic device 900 is embodied in the form of a general purpose computing device. Components of electronic device 900 may include, but are not limited to: at least one processing unit 510, at least one memory unit 920, a bus 930 connecting the various system components (including the memory unit 920 and the processing unit 910), a display unit 940, and the like. Wherein the storage unit stores program code executable by the processing unit 910 to cause the processing unit 910 to perform the steps according to various exemplary embodiments of the present invention described in the above-mentioned temperature compensation method section of the present specification. For example, the processing unit 910 may perform the steps as shown in fig. 1. The storage unit 920 may include a readable medium in the form of a volatile storage unit, such as a random access memory unit (RAM)9201 and/or a cache memory unit 9202, and may further include a read only memory unit (ROM) 9203. The memory unit 920 may also include a program/utility 9204 having a set (at least one) of program modules 9205, such program modules 5205 including but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which, or some combination thereof, may comprise an implementation of a network environment. Bus 930 can be any of several types of bus structures including a memory unit bus or memory unit controller, a peripheral bus, an accelerated graphics port, a processing unit, or a local bus using any of a variety of bus architectures.
The electronic device 900 may also communicate with one or more external devices 1000 (e.g., keyboard, pointing device, bluetooth device, etc.), with one or more devices that enable a tenant to interact with the electronic device 900, and/or with any devices (e.g., router, modem, etc.) that enable the electronic device 900 to communicate with one or more other computing devices. Such communication may occur via input/output (I/O) interface 950. Also, the electronic device 500 may communicate with one or more networks (e.g., a Local Area Network (LAN), a Wide Area Network (WAN) and/or a public network, such as the Internet) via the network adapter 960. The network adapter 960 may communicate with other modules of the electronic device 500 via the bus 930. It should be appreciated that although not shown, other hardware and/or software modules may be used in conjunction with the electronic device 900, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, among others.
Through the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein may be implemented by software, or by software in combination with necessary hardware. Therefore, the technical solution according to the embodiment of the present invention can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a usb disk, a removable hard disk, etc.) or on a network, and includes several instructions to make a computing device (which can be a personal computer, a server, or a network device, etc.) execute the above-mentioned temperature compensation method of the temperature-sensing sensor according to the embodiment of the present invention.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

Claims (20)

1. A temperature compensation method for a temperature-sensitive sensor is characterized by comprising the following steps:
calculating a distance compensation coefficient according to the size parameter of the heating surface of the object to be measured and the distance between the object to be measured and the temperature sensing sensor based on a distance compensation model;
based on an angle compensation model, calculating an angle compensation coefficient according to the position of the object to be detected in a pixel matrix of the temperature sensor; and
and compensating the temperature of the object to be detected by the temperature sensing sensor by adopting a distance compensation coefficient and/or an angle compensation coefficient to obtain a compensated temperature.
2. The temperature compensation method of a temperature-sensitive sensor according to claim 1, wherein the position of the object to be measured in the pixel matrix of the temperature-sensitive sensor is represented by a coordinate of a highest temperature of the object to be measured in the pixel matrix of the temperature-sensitive sensor, the angle compensation coefficient is a product of an abscissa angle compensation coefficient and an ordinate angle compensation coefficient, and the angle compensation model includes a first angle compensation model configured to calculate the abscissa angle compensation coefficient and a second angle compensation model configured to calculate the ordinate angle compensation coefficient.
3. The temperature compensation method of a temperature sensitive sensor according to claim 2, wherein the first angle compensation model is generated by:
for at least one temperature sensing sensor with the same model, for the same test object, when the distance between the test object and the temperature sensing sensor is unchanged, and the test object is in a pixel matrix of the temperature sensing sensor, and the ordinate of the highest temperature point is unchanged, acquiring a first compensation curve between the abscissa of the highest temperature point and a quasi-abscissa angle compensation coefficient in the pixel matrix of the temperature sensing sensor, wherein the first compensation curve is generated according to the values of the abscissa of the highest temperature point and the quasi-abscissa angle compensation coefficient in a plurality of groups of the same test object in the pixel matrix of the temperature sensing sensor;
and fitting at least one first compensation curve to obtain the first angle compensation model.
4. The temperature compensation method of a temperature-sensitive sensor according to claim 3, wherein the quasi-abscissa angle compensation coefficient cprxCalculated according to the following formula:
Figure FDA0002384171130000021
wherein, TcenIs a matrix reference temperature, which is the temperature, T, of the same test object detected by the temperature sensor when the highest temperature point is the center of the pixel matrix of the temperature sensor in the pixel matrix of the temperature sensorxWhen the same test object is in the pixel matrix of the temperature sensor and the abscissa of the highest point of temperature is x, the temperature sensor detects the temperature of the same test object.
5. The temperature compensation method of a temperature sensitive sensor according to claim 2, wherein the second angle compensation model is generated by:
for at least one temperature sensing sensor with the same model, when the distance between the test object and the temperature sensing sensor is unchanged and the abscissa of the highest temperature point of the test object in the pixel matrix of the temperature sensing sensor is unchanged, a second compensation curve between the ordinate of the highest temperature point and a quasi-ordinate angle compensation coefficient of the test object in the pixel matrix of the temperature sensing sensor is obtained, and the second compensation curve is generated according to the values of the ordinate of the highest temperature point and the quasi-ordinate angle compensation coefficient of a plurality of groups of the same test objects in the pixel matrix of the temperature sensing sensor;
and fitting at least one second compensation curve to obtain the second angle compensation model.
6. The temperature compensation method of a temperature-sensitive sensor according to claim 5, wherein the quasi-ordinate angle compensation coefficient cpryCalculated according to the following formula:
Figure FDA0002384171130000022
wherein, TcenIs a matrix reference temperature, which is the temperature, T, of the same test object detected by the temperature sensor when the highest temperature point is the center of the pixel matrix of the temperature sensor in the pixel matrix of the temperature sensoryWhen the same test object is in the pixel matrix of the temperature sensor and the ordinate of the highest temperature point is y, the temperature of the same test object is detected by the temperature sensor.
7. The temperature compensation method of a temperature sensitive sensor according to claim 1, wherein the distance compensation coefficient includes:
a first distance compensation coefficient, wherein a temperature difference of the object to be measured detected by the temperature sensor is reduced when the distance between the object to be measured and the temperature sensor is changed after the first distance compensation coefficient is adopted compared with the uncompensated state, and correspondingly, the distance compensation model at least comprises a first distance compensation model configured to calculate the first distance compensation coefficient; and/or
And a second distance compensation coefficient, wherein the difference between the temperature of the object to be measured detected by the temperature sensor and the actual temperature of the object to be measured is reduced after the second distance compensation coefficient is adopted compared with the uncompensated state, and correspondingly, the distance compensation model at least comprises a second distance compensation model configured to calculate the second distance compensation coefficient.
8. The temperature compensation method of a temperature-sensitive sensor according to claim 7, wherein the first distance compensation model is generated by:
for at least one test object, acquiring a third compensation curve between the equivalent distance between the test object and the temperature sensing sensor and the quasi-first distance compensation coefficient, wherein the third compensation curve is generated according to a plurality of groups of values of the equivalent distance between the test object and the temperature sensing sensor and the quasi-first distance compensation coefficient;
and fitting at least one third compensation curve to obtain the first distance compensation model.
9. The temperature compensation method of a temperature-sensitive sensor according to claim 8, wherein the second distance compensation model is generated by:
when the detected temperature is closest to the actual temperature of the test object, the equivalent distance between the test object and the temperature-sensing sensor is used as the reference equivalent distance dbase(ii) a And
according to the first distance compensation model, taking the ratio of the first distance compensation coefficient to a first reference distance compensation coefficient as the second distance compensation model, wherein the first reference distance compensation coefficient is the equivalent distance between the test object and the temperature sensor and is the reference equivalent distance dbaseThe first distance compensation factor.
10. The temperature compensation method of a temperature sensor according to claim 9, wherein the second distance compensation model includes a plurality of sub-second distance compensation models, each sub-second distance compensation model corresponding to a different size parameter range, and the calculating a distance compensation coefficient according to the size parameter of the heat generating surface of the object to be measured and the distance between the object to be measured and the temperature sensor based on the distance compensation model includes:
and determining the sub second distance compensation model for calculating the second distance compensation coefficient of the object to be measured according to the matching of the size parameter of the heating surface of the object to be measured and the size parameter range corresponding to each sub second distance compensation model.
11. The temperature compensation method of a temperature sensor according to any one of claims 8 to 10, wherein the calculating a distance compensation coefficient based on a distance compensation model based on a size parameter of a heat generation surface of the object to be measured and a distance between the object to be measured and the temperature sensor comprises:
and calculating the equivalent distance between the object to be tested and the temperature-sensing sensor according to the size parameter of the heating surface of the object to be tested and the distance between the object to be tested and the temperature-sensing sensor, wherein the calculation mode of the equivalent distance between the object to be tested and the temperature-sensing sensor is the same as the calculation mode of the equivalent distance between the object to be tested and the temperature-sensing sensor.
12. The temperature compensation method of the temperature sensitive sensor according to any one of claims 8 to 10, wherein the equivalent distance d iseqCalculated according to the following formula:
Figure FDA0002384171130000041
wherein d isrealIs the actual distance between the test object and the temperature-sensitive sensor, dunThe minimum size parameter of the heating surface of the reference test object is Dim, and the size parameter of the heating surface of the test object is Dim.
13. The temperature compensation method of the temperature sensitive sensor according to any one of claims 8 to 10, wherein the quasi-first distance compensation coefficient cprd1Calculated according to the following formula:
Figure FDA0002384171130000042
wherein, TdmaxIs the actual distance between the test object and the temperature-sensitive sensorIs separated by dmaxThe temperature of the test object, T, detected by the temperature sensordrealThe actual distance between the test object and the temperature-sensing sensor is drealThe temperature of the test object is detected by the temperature sensor, wherein dmaxIs n times of the minimum size parameter of the heating surface of the test object, and n is the object distance ratio of the temperature sensing sensor.
14. The temperature compensation method of a temperature sensitive sensor according to any one of claims 7 to 10, wherein the distance compensation coefficient is a product of the first distance compensation coefficient and the second distance compensation coefficient.
15. The temperature compensation method of a temperature-sensitive sensor according to any one of claims 1 to 10, wherein the compensated temperature is a product of a temperature of the object to be measured detected by the temperature-sensitive sensor, the distance compensation coefficient, and the angle compensation coefficient.
16. A temperature compensation device for a temperature-sensitive sensor, comprising:
the distance compensation calculation module is configured to calculate a distance compensation coefficient according to a size parameter of a heating surface of an object to be measured and a distance between the object to be measured and the temperature sensing sensor based on a distance compensation model;
the angle compensation calculation module is configured to calculate an angle compensation coefficient according to the position of the object to be measured in the pixel matrix of the temperature sensing sensor based on an angle compensation model; and
and the compensation module is configured to compensate the temperature of the object to be detected by the temperature sensing sensor by adopting a distance compensation coefficient and/or an angle compensation coefficient to obtain a compensated temperature.
17. A temperature compensation method for a temperature-sensitive sensor is characterized by comprising the following steps:
calculating a distance compensation coefficient according to the size parameter of the heating surface of the object to be measured and the distance between the object to be measured and the temperature sensing sensor based on a distance compensation model; and
and compensating the temperature of the object to be detected by the temperature sensing sensor by adopting the distance compensation coefficient to obtain compensated temperature.
18. A temperature compensation method for a temperature-sensitive sensor is characterized by comprising the following steps: based on an angle compensation model, calculating an angle compensation coefficient according to the position of an object to be measured in a pixel matrix of the temperature sensor; and
and compensating the temperature of the object to be detected by the temperature sensing sensor by adopting the angle compensation coefficient to obtain compensated temperature.
19. An electronic device, characterized in that the electronic device comprises:
a processor;
a memory on which is stored a computer program that, when executed by the processor, performs the temperature-sensitive sensor temperature compensation method according to any one of claims 1 to 15.
20. A storage medium having stored thereon a computer program which, when executed by a processor, executes the temperature-sensitive sensor temperature compensation method according to any one of claims 1 to 15.
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