CN103424192B - A kind of method of infrared thermometer temperature drift compensation - Google Patents

A kind of method of infrared thermometer temperature drift compensation Download PDF

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Publication number
CN103424192B
CN103424192B CN201310296475.5A CN201310296475A CN103424192B CN 103424192 B CN103424192 B CN 103424192B CN 201310296475 A CN201310296475 A CN 201310296475A CN 103424192 B CN103424192 B CN 103424192B
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China
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temperature
movement
infrared
infrared thermometer
baffle plate
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CN201310296475.5A
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Chinese (zh)
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CN103424192A (en
Inventor
吕坚
王仙
孟祥笙
周云
丁维一
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电子科技大学
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Abstract

The embodiment of the invention discloses a kind of method of infrared thermometer temperature drift compensation, be included in difference set temperature sensor on movement and baffle plate, and in constant temperature oven, blackbody radiation is responded, the many groups of responses being obtained infrared thermometer by the consecutive variations controlling constant temperature oven and blackbody temperature are exported; The multi-group data that obtains the first temperature to the temperature in the temperature of the response output of infrared thermometer and black matrix, constant temperature oven and movement is utilized to carry out linear fit; By the result of matching, the temperature drift that movement temperature causes is compensated, and the relation function of the first temperature of the temperature obtained in the temperature of the response output of infrared thermometer and black matrix, constant temperature oven and movement; Calibrated by baffle plate, and obtain current environmental temperature according to the relation function of matching; Remove baffle plate infrared thermometer to target object thermometric, utilize that current response exports, the relation function of current environmental temperature and matching calculates the temperature of described target object.In this method, can Real-Time Monitoring calibration baffle plate, movement temperature variation the temperature drift that movement, variation of ambient temperature cause is compensated, effectively can correct the heterogeneity of infrared thermometer, improve temperature measurement accuracy.

Description

A kind of method of infrared thermometer temperature drift compensation

Technical field

The present invention relates to infrared imaging field, particularly relate to a kind of method of infrared thermometer temperature drift compensation.

Background technology

All temperature higher than the object of absolute zero all at ceaselessly spatial emission infrared energy towards periphery, the size of infrared energy has very close relationship by the distribution of wavelength and its surface temperature, by the measurement of infrared energy sent object self, its surface temperature can be measured exactly.

Infrared temperature-test technology is gradually improved along with the development of modern technologies, and penetrates into every field gradually.The infrared temperature-test technology of development of new, the performance improving infrared temperature measurement system is the requirement of era development.

In numerous infrared temperature-test technology, the of greatest concern infrared temperature-test technology surely belonged to based on blackbody radiation principle, its non-cpntact measurement, achieves telemetry, greatly improves the serviceable life of instrument simultaneously, reduces production cost; Photon as information carrier, fast response time; Highly sensitive; Bandwidth, dynamic range is large; Conveniently be connected with computing machine, easily realize digitizing, intelligent; Volume is little, lightweight, price constantly descends degradation advantage to make it in other thermometry, occupy increasing advantage.

In infrared measurement of temperature process, slow change can be there is in the response characteristic of infrared focal plane array probe unit along with the change of time and environment, thisly to change slowly, i.e. drift phenomenon, this drift can make the Nonuniformity Correction coefficient generated in use produce larger error, if not to drift, the temperature measurement accuracy of infrared system can be had a strong impact on.Therefore the monitor and forecast of temperature seems particularly important to the temperature measurement accuracy improving infrared eye to external world.

Infrared focal plane array temperature drift Producing reason has a lot, and it is mainly because impact that external environment and internal component temperature variation are first on detection causes.Because no-refrigeration infrared focal plane detector system is without refrigerating plant, when working in environment temperature, the response characteristic of probe unit can be drifted about slowly along with the change of environment temperature, power-supply fluctuation, absorption infrared radiation and baffle temperature.

At present for the phenomenon of infrared thermometer temperature drift, the solution usually adopted has two kinds: one to be that the special compensating circuit of design compensates, and two is utilize the method for software to compensate.Wherein software approach generally adopt a point calibration, two point correction, Supplements and a point calibration and two point correction simultaneously and Non-uniformity Correction Algorithm, select suitable calibration object and the change etc. of the temperature that controls environment simultaneously.These methods can carry out certain compensation to temperature drift, but in actual thermometric process, baffle plate self-temperature as calibration also can change, the change of system movement and environment temperature is also uncontrollable on the impact of infrared eye, therefore these methods all can not compensate the temperature drift of infrared measurement of temperature thoroughly, the Nonuniformity Correction of infrared thermometer can not get effective raising, and the temperature measurement accuracy of whole system does not reach desirable effect yet.

Summary of the invention

An object of the present invention be to provide a kind of can Real-Time Monitoring baffle plate and movement temperature variation method to the infrared thermometer temperature drift compensation that temperature drift compensates.

Disclosed in the embodiment of the present invention, technical scheme comprises:

Provide a kind of method of infrared thermometer temperature drift compensation, it is characterized in that, comprising:

The movement of described infrared thermometer arranges the first temperature sensor;

Described infrared thermometer is placed in constant temperature oven respond blackbody radiation, the first response obtaining the infrared focal plane array of described infrared thermometer exports, and acquisition responds the temperature in the temperature exporting corresponding described black matrix, described constant temperature oven with described first, and respond with described first the first temperature exporting corresponding described movement by described first temperature sensor acquisition;

Matching is carried out to the first temperature of described first response outputs, temperature in the temperature of described black matrix, described constant temperature oven and described movement, obtains described first response and export and first relation function of the first temperature of the temperature of described black matrix, temperature in described constant temperature oven and described movement;

Described infrared thermometer is taken out from described constant temperature oven;

Baffle plate is placed between the infrared lens of described infrared thermometer and described infrared focal plane array, and is provided with the second temperature sensor on described baffle plate;

Obtained the temperature of described baffle plate by described second temperature sensor, obtained the second temperature of described movement by described first temperature sensor, and the second response obtaining the described infrared focal plane array of described infrared thermometer exports;

According to the second temperature of the temperature of described baffle plate, described movement, described second response exports and described first relation function calculates current environmental temperature;

The temperature drift that temperature by described movement causes is compensated, obtains the response output of described infrared thermometer and the second relation function between environment temperature and baffle temperature;

Carry out imaging with described infrared thermometer to target object, the current response obtaining the infrared focal plane array of described infrared thermometer exports;

The temperature of described target object is calculated according to described current response output, described current environmental temperature and described second relation function.

Further, obtain multiple first response export and with each first the first temperature responding temperature, temperature in constant temperature oven and the movement exporting corresponding black matrix.

In the method for embodiments of the invention, can Real-Time Monitoring calibration baffle plate, movement temperature variation the temperature drift that movement, variation of ambient temperature cause is compensated, effectively can correct the heterogeneity of infrared thermometer, improve temperature measurement accuracy.

Accompanying drawing explanation

Fig. 1 is the schematic flow sheet of the method for the infrared thermometer temperature drift compensation of one embodiment of the invention.

Embodiment

Describe embodiments of the invention in detail below with reference to the accompanying drawings.

Fig. 1 is the schematic flow sheet of the method for a kind of infrared thermometer temperature drift compensation of one embodiment of the invention, is described in detail below to each step in the embodiment of Fig. 1.

As shown in Figure 1, in embodiments of the invention, a kind of method of infrared thermometer temperature drift compensation comprises step 10, step 12, step 16 and step 18.

Step 10: the first temperature sensor is set on the movement of infrared thermometer.

In the process of infrared thermometer work, due to factors such as distribute heats in such as infrared thermometer devices function, movement temperature can change, thus affects the output of the infrared focal plane array of infrared thermometer.In embodiments of the invention, the movement of infrared thermometer arranges the first temperature sensor, with the temperature of Real-Time Monitoring movement.

The movement of infrared thermometer is also the controller of infrared thermometer, it can be the electron device be applicable to of any type, such as, single-chip microcomputer, microprocessor, various applicable special IC, various applicable logical device (such as FPGA, CPLD etc.) etc. can be passed through realize.Some steps of the method for the infrared thermometer temperature drift compensation in embodiments of the invention can realize or perform in this movement, or realize under the control of this movement.

The controller of infrared thermometer can also be communicated with host computer by data transmission interface, thus works under the control of host computer.Here, host computer can be such as other computing machine or other control device.Data transmission interface can be the data-interface carrying out data transmission between any applicable distinct electronic apparatuses, such as, can be RS232 interface etc.

In embodiments of the invention, the first temperature sensor can be any applicable temperature sensor, as long as can measure the temperature obtaining movement in real time.This first temperature sensor can be integrated on movement, also can be that the connected mode by being applicable to is arranged on movement.

First temperature sensor is electrically connected to the movement of infrared thermometer, and works under the control of movement.Under the control of movement, the first temperature sensor gathers the temperature of movement, and the temperature data of collection is sent to controller.

Step 12: in constant temperature oven, response matching are carried out to blackbody radiation and obtain the first relation function.

In infrared thermometer, the radiation (measuring with the temperature T of target object) of the response output of infrared focal plane array pixel and target object, environment temperature T environment, movement temperature T movementrelevant, this relation can be with the function representation of a simulation:

(1)

This funtcional relationship represents the response characteristic of the infrared focal plane array of infrared thermometer itself.

In embodiments of the invention, can by exporting the response of the black matrix of specified temp under the infrared focal plane array of infrared thermometer at specific environment temperature, specific movement temperature, the response output of the infrared focal plane array of acquisition infrared thermometer and blackbody temperature (being equivalent to the temperature of target object), funtcional relationship between this constant environment temperature (being equivalent to environment temperature) and movement temperature.

Therefore, in step 12, under infrared thermometer can being placed in constant environment temperature, such as, being placed in constant temperature oven, in constant temperature oven, blackbody radiation being responded.

Now, control black matrix and there is certain temperature, control, in constant temperature oven, also there is certain temperature.Infrared focal plane array in infrared thermometer will have certain response for the black matrix that this has certain temperature and export, herein by constant temperature oven time infrared thermometer in the response of infrared focal plane array export and be referred to as the first response and export.

Now, first response of measuring the infrared focal plane array of infrared thermometer exports, and obtain the temperature of movement now (herein by the first temperature sensor on movement, by in constant temperature oven time measure the movement temperature obtained and be referred to as the first temperature of movement), like this, one group of data can be obtained: the first temperature, first response of the temperature of black matrix, the temperature of constant temperature oven, movement export.

Control the temperature variation in the temperature of black matrix and constant temperature oven, for the temperature often organized in blackbody temperature and constant temperature oven, all measure the first response obtaining corresponding the first temperature of movement and the infrared focal plane array of infrared thermometer to export, like this, a series of data group can be obtained.

Then, the first response obtained is exported, this series of data group of the first temperature of temperature in the temperature of black matrix, constant temperature oven and movement carries out matching, and by the drift that the result of matching causes movement temperature, obtain the first response and export and relation function between the temperature of black matrix, temperature in constant temperature oven and the first temperature of movement:

(2)

Wherein T bit is the temperature of black matrix.

Be referred to as the first relation function herein.

The method of these data groups being carried out to matching can use any applicable approximating method in art of mathematics, does not repeat them here.Can perform by movement the program be applicable to the fit procedure of data group to realize.

Step 16: take out infrared thermometer and with baffle plate calibration, obtain current environmental temperature from constant temperature oven.

After obtaining the first relation function, namely this first relation function available demarcates current environment temperature.

In step 16, first infrared thermometer is taken out from constant temperature oven, then between the infrared lens and infrared focal plane array of infrared thermometer.This baffle plate can drive by any applicable mode, such as, in infrared thermometer, can motor be set, the output shaft of motor is connected with baffle plate by transmission transposition, thus drive baffle plate to move between infrared lens and infrared focal plane array, or remove between infrared lens and infrared focal plane array.

In embodiments of the invention, baffle plate can arrange the second temperature sensor.Second temperature sensor can be any applicable temperature sensor, as long as can measure the temperature obtaining baffle plate in real time.This second temperature sensor can be integrated on baffle plate, also can be that the connected mode by being applicable to is arranged on baffle plate.

Second temperature sensor is electrically connected to the movement of infrared thermometer, and works under the control of movement.Under the control of movement, the second temperature sensor gathers the temperature of baffle plate, and the temperature data of collection is sent to movement.

After baffle plate is arranged between infrared lens and infrared focal plane array, infrared focal plane array can respond the radiation of baffle plate and produce response output (, the response of the infrared focal plane array when calibrating with baffle plate output being referred to as the second response herein to export).

Measure the second response obtaining infrared focal plane array to export, and the temperature of baffle plate is obtained by the second temperature sensor, and the temperature (, the temperature of the movement when calibrating with baffle plate being referred to as the second temperature of movement herein) of movement is obtained by the first temperature sensor.

Then, can export and aforesaid first funtcional relationship according to the second response of the second temperature of the temperature of the baffle plate obtained, movement, infrared focal plane array, can current environmental temperature be calculated.

When calibrating with baffle plate, if the spoke out-degree of black matrix is P b, the radiation energy of baffle plate is P gear, when infrared focal plane array receives identical spoke out-degree, the pass of baffle temperature and blackbody temperature is:

Can release:

(3)

Or

(4)

Wherein ε is the emissivity of baffle plate, is transmissivity of optical system, T bthe temperature of black matrix, T gearit is the temperature of baffle plate.

Formula (3) is substituted in formula (2), now the second response can be obtained and export and baffle temperature, funtcional relationship between environment temperature and movement temperature:

(5)

Be referred to as the second relation function herein.

Described in above, in step 16, obtain the temperature (T namely in formula (5) of baffle plate gear), the second temperature (T namely in formula (5) of movement movement) and infrared focal plane array second response export (V namely in formula (5)).Therefore, according to formula (5), the current environmental temperature (T namely in formula (5) can be calculated environment).

Step 18: with infrared thermometer to target object thermometric, obtains target object temperature.

Obtain current environmental temperature and the second relation function in abovementioned steps after, baffle plate can be removed between infrared lens and infrared focal plane array, then with this infrared thermometer to target object thermometric, the current response obtaining now infrared focal plane array exports.

Then, according to second relation function (formula (5)) of aforementioned acquisition, and current response output (is equivalent to the V in formula (5) 2) and step 16 in the second temperature of movement (be equivalent to the T in formula (5) movement) and step 16 in obtain current environmental temperature and (be equivalent to the T in formula (5) environment) surface temperature (T now, in formula (5) of target object can be calculated gearbe target object surface temperature).

In the method for embodiments of the invention, can Real-Time Monitoring calibration baffle plate, movement temperature variation the temperature drift that movement, variation of ambient temperature cause is compensated, effectively can correct the heterogeneity of infrared thermometer, improve temperature measurement accuracy.

Described the present invention by specific embodiment above, but the present invention is not limited to these specific embodiments.It will be understood by those skilled in the art that and can also make various amendment, equivalent replacement, change etc. to the present invention, as long as these conversion do not deviate from spirit of the present invention, all should within protection scope of the present invention.In addition, " embodiment " described in above many places represents different embodiments, can certainly by its all or part of combination in one embodiment.

Claims (2)

1. a method for infrared thermometer temperature drift compensation, is characterized in that, comprising:
The movement of described infrared thermometer arranges the first temperature sensor;
Described infrared thermometer is placed in constant temperature oven respond blackbody radiation, the first response obtaining the infrared focal plane array of described infrared thermometer exports, and acquisition responds the temperature in the temperature exporting corresponding described black matrix, described constant temperature oven with described first, and respond with described first the first temperature exporting corresponding described movement by described first temperature sensor acquisition;
Matching is carried out to the first temperature of the temperature in described first response output, the temperature of described black matrix, described constant temperature oven and described movement, and by the result of matching, the temperature drift that movement temperature causes is compensated, obtain described first response and export the first relation function with the first temperature of the temperature in the temperature of described black matrix, described constant temperature oven and described movement;
Described infrared thermometer is taken out from described constant temperature oven;
Baffle plate is placed between the infrared lens of described infrared thermometer and described infrared focal plane array, and is provided with the second temperature sensor on described baffle plate;
When receiving identical spoke out-degree by measuring infrared focal plane array, the relation of baffle temperature and blackbody temperature and described first relation function, calculate response and export the second relation function with the temperature of described baffle plate, environment temperature and described movement temperature;
Obtained the temperature of described baffle plate by described second temperature sensor, obtained the second temperature of described movement by described first temperature sensor, and the second response obtaining the described infrared focal plane array of described infrared thermometer exports;
According to the second temperature of the temperature of described baffle plate, described movement, described second response exports and described second relation function calculates current environmental temperature;
Removed between described infrared lens and described infrared focal plane array by described baffle plate, then carry out thermometric with described infrared thermometer to target object, the current response obtaining the infrared focal plane array of described infrared thermometer exports;
The temperature of described target object is calculated according to described current response output, the second temperature of described movement, described current environmental temperature and described second relation function.
2. the method for claim 1, it is characterized in that: export in the first response of the infrared focal plane array obtaining described infrared thermometer, and acquisition responds the temperature in the temperature exporting corresponding described black matrix, described constant temperature oven with described first, and to be obtained by described first temperature sensor and respond in the step of the first temperature exporting corresponding described movement with described first, obtain multiple first respond output and with each first the first temperature responding temperature, temperature in constant temperature oven and the movement exporting corresponding black matrix.
CN201310296475.5A 2013-07-16 2013-07-16 A kind of method of infrared thermometer temperature drift compensation CN103424192B (en)

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CN103792011B (en) * 2014-01-27 2016-05-25 无锡艾立德智能科技有限公司 A kind of self adaptation thermal infrared imager temperature drift compensation method and device
NZ722834A (en) * 2014-02-19 2019-03-29 Mallinckrodt Hospital Products Ip Ltd Systems and methods for compensating long term sensitivity drift of electrochemical gas sensors exposed to nitric oxide
CN103869151B (en) * 2014-03-24 2017-06-13 国家电网公司 A kind of sampling resistor real-time deviation correcting compensation method based on infrared principles
CN104181613B (en) * 2014-08-13 2017-02-15 中国人民解放军理工大学 Foundation infrared ceilometer on-site calibration method
CN104280136B (en) * 2014-09-30 2017-05-17 中国电子科技集团公司第四十一研究所 Temperature drift and spectral response compensation method for pyroelectric detector
CN104634458A (en) * 2014-11-04 2015-05-20 北京富吉瑞光电科技有限公司 Temperature measurement calibration system and temperature measurement method
CN105864956A (en) * 2016-03-28 2016-08-17 广东美的暖通设备有限公司 Drifting detection method for temperature sensor in air side heat exchanger, processor and air conditioner
CN106768347B (en) * 2016-11-17 2019-03-05 中国航空工业集团公司洛阳电光设备研究所 A kind of temp measuring method of the uncooled ir temperature measurer of uncompensated device
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