CN103196561B - Device of measuring polarization characteristic of object at multiple angles and method of achieving measurement of polarization characteristic of object at multiple angles thereof - Google Patents
Device of measuring polarization characteristic of object at multiple angles and method of achieving measurement of polarization characteristic of object at multiple angles thereof Download PDFInfo
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Abstract
The invention discloses a device of measuring a polarization characteristic of an object at multiple angles and a method of achieving measurement of the polarization characteristic of the object at multiple angles of the device and belongs to the infrared technical field, the space remote sensing field and the image processing field. The device of measuring the polarization characteristic of the object at multiple angles and the method of achieving the measurement of the polarization characteristic of the object at multiple angles of the device aim to solve the problem that an existing device of measuring the polarization characteristic of the object is single in measuring direction. The method of achieving the measurement of the polarization characteristic of the object at multiple angles of the device includes that a computer is used for controlling a stepped-motor controller to drive an electronic control rotating platform to rotate so as to drive a polarization thermal imager to conduct circling motion, when the polarization thermal imager conducts the circling motion, the computer continuously collects strength information which is radiated by a detected sample in three polarization directions and is measured and obtained by the polarization thermal imager, the computer conducts data processing on the strength information which is obtained every time and radiated by the detected sample in the three polarization directions, and therefore information including the Strokes vector, the linear polarization degree, and the polarization directions and the like is obtained. The device of measuring the polarization characteristic of the object at multiple angles and the method of achieving measurement of the polarization characteristic of the object at multiple angles of the device are mainly used for recognizing a target and judging the attitude of the observed object.
Description
Technical field
The present invention is specifically related to a kind of measurement target self infrared radiation polarization information, and target polarization information is with the device of observation angle and temperature variation, belongs to infrared technique field, space remote sensing field and image processing field.
Background technology
Culture reflection and emitting electromagnetic wave process in all can produce polarization characteristic, this characteristic is by object self property, such as surfaceness and optics philosophy decision.Stokes (Stokes) vector, is used to the vector describing object radiation polarization of electromagnetic wave state.Stokes vector describes polarisation of light information and radiation intensity information by four stokes parameters:
In formula, I represents the total light intensity of test sample emission;
Q represents level and vertical direction light intensity difference;
U represents 45 ° of direction linear polarization light intensity difference;
V represents circular polarization amount, and the circular component of general test sample is very little, does not usually consider, gets V=0.
Can in the hope of the linear polarization degree P of object radiation (DOLP:Degree of Linear Polarization) and polarization angle α (AOLP:Angel of Linear Polarization) by Story gram this vector:
P in formula---linear polarization degree, P=0 is nonpolarized light, and P=1 is full-polarization, and 0<P<1 is partial poolarized light;
α---angle, polarization direction, for partial poolarized light, is exactly the angle of the maximum polarization direction of energy and X-axis.
The polarization characteristic of target generally changes along with target self physicochemical characteristics (such as roughness, water cut) and observation angle.Therefore, for characterizing the Stokes vector of object polarization characteristic, can be used for reflecting some physicochemical characteristicses of object, and observation angle.After target is determined, namely the physicochemical property of target is determined, at this time the polarization characteristic of target often depends on observation angle; Can be regarded as from another angle, when observation angle one timing, the polarization characteristic of target depends on angle and the attitude of the relative observation position of target, that is, by the polarization characteristic of the detection of a target, can determine the attitude of target relative to observation position, no matter this is to identifying target and judging that the attitude of target is helpful in space-based early warning or ground observation.Therefore, it is very significant for inventing a kind of target polarization information with the measurement mechanism of observation angle and temperature variation.
The polarization characteristic of the single direction of object measured mostly by current measurement mechanism, these devices are when measuring object polarization characteristic along with observation angle variation relation, need repetitive measurement at the polarization characteristic of different observation angle, and need when measuring manually to adjust angle, such measuring process is consuming time, and measuring accuracy can not be guaranteed, and the limited angle measured can not provide change curve.
Summary of the invention
The object of the invention is the problem that measurement device direction in order to solve existing measurement object polarization characteristic is single, the invention provides the measuring method that a kind of device of multiangular measurement object polarization characteristic and this device realize multi-angle object polarization characteristic.
The device of multiangular measurement object polarization characteristic, it is made up of heating module, rotating module, data acquisition module and data processing module; Described heating module is made up of automatic constant temperature heating device and adjustable angle sample holder; Described rotating module is made up of automatically controlled universal stage and controllor for step-by-step motor; Described data acquisition module is made up of lifting table, polarization thermal imaging system and slideway; Described data processing module is computing machine;
Described automatic constant temperature heating device is round platform, described adjustable angle sample holder is fixed on the center of the upper surface of automatic constant temperature heating device, described automatic constant temperature heating device is fixed on the fixed part of automatically controlled universal stage, the slide rail of slideway is linear pattern slide rail, described linear pattern slide rail one end is fixedly connected with the sidewall of the rotating part of automatically controlled universal stage, and the elongated central line of this linear pattern slide rail is crossing with the rotation center of automatically controlled universal stage; The slide block upper surface of slideway is fixed with lifting table, the table top of described lifting table is fixed with polarization thermal imaging system, the optical axis of described polarization thermal imaging system is crossing with the extended line of the turning axle of automatically controlled universal stage, the described data signal output of polarization thermal imaging system is connected with the data signal input of computing machine, the universal stage control signal output terminal of described computing machine is connected with the control signal input end of automatically controlled universal stage, and the heating signal output part of described computing machine is connected with the control signal input end of automatic constant temperature heating device.
Described automatic constant temperature heating device is cylindrical.
The table top of described lifting table vertically moves up and down, and makes the vertical height of the optical axis of polarization thermal imaging system distance slideway be more than or equal to the vertical height of upper surface apart from slideway of automatic constant temperature heating device.
The polaroid of described polarization thermal imaging system is provided with 0 °, 60 ° and 120 ° of three polarization directions simultaneously.
The radiation intensity information on 0 °, 60 ° and 120 ° of three polarization directions measured by polarization thermal imaging system simultaneously.
The device of multiangular measurement object polarization characteristic is adopted to realize the measuring method of multi-angle object polarization characteristic as follows:
First, by the angle of adjustment polarization thermal imaging system, the optical axis of polarization thermal imaging system and the central axis of automatic constant temperature heating device are intersected at a point, secondly, test sample is placed on adjustable angle sample holder, then by computing machine, automatic constant temperature heating device is controlled, after making the temperature of test sample keep a certain fixed temperature, automatically controlled universal stage is driven to do 360 degree of rotations by computer-controlled stepper motor controller again, thus drive polarization thermal imaging system to circle, in the process that polarization thermal imaging system circles, computing machine continuous acquisition polarization thermal imaging system is measured and is obtained the radiation intensity information of test sample emission on three polarization directions, and the anglec of rotation of corresponding automatically controlled universal stage, this anglec of rotation is and gathers detection angle corresponding to described radiation intensity information, computing machine carries out data processing to each radiation intensity information of test sample emission on three polarization directions gathered, obtain the Stokes vector of test sample, linear polarization degree and polarization direction angle information, and by the Stokes vector of obtained test sample, linear polarization degree and polarization direction angle information and corresponding detection angle are as one group of data.
The process that described computing machine carries out data processing to each radiation intensity information of test sample emission on three polarization directions gathered is as follows:
The light intensity I'(θ that polarization thermal imaging system detects) available (3) formula represents:
I'(θ)=(I+Qcos2θ+Usin2θ)/2 （3）
Polarization thermal imaging system detects and obtains I'(0), I'(60) and radiation intensity information I'(120), I, Q and U tri-amount can be calculated by formula (4);
By calculating I, Q and U, and bring I, Q and U of obtaining into formula (2):
That is, linear polarization degree and angle, polarization direction is calculated.
Heating module heats and keeps testing the stable of sample temperature, and heating module is controlled by computing machine, ensure that the precision of measuring tempeature;
Rotating module realizes different taking measurement of an angle by an automatically controlled universal stage, and automatically controlled universal stage is controlled by computer-controlled stepper motor controller, substantially increases the speed of measurement, and the running accuracy of automatically controlled universal stage ensure that the accuracy taken measurement of an angle simultaneously;
Data acquisition module is used for collecting the infrared radiation polarization information testing sample, and gatherer process has been controlled by computing machine equally, saves Measuring Time further;
Data processing module is used for calculating each parameter of Stokes vector, linear polarization degree, and angle, polarization direction, observed ray angle and polarization information are along with observed ray variation relation data.
Under the whole measuring process of this device is all in computing machine control, therefore measuring speed and measuring accuracy are improved.
The radiation intensity information of object is measured by the polarization thermal imaging system in data acquisition module, the Stokes vector of the radiation of object, linear polarization degree and angle, polarization direction just can be able to be obtained follow-up data process by computing machine, polarization information also can be obtained follow-up data process by computing machine with the change of observed ray, just can realize the measurement to target emanation polarization information with a kind of instrument like this, and obtain the variation relation of object radiation polarization information along with target emanation direction.
Principle analysis: specifically see Fig. 2, switch on power, computing machine drives automatically controlled universal stage to rotate by the work of control step electric machine controller, thus drive polarization thermal imaging system to circle, in the process that polarization thermal imaging system 6 circles, computing machine controls automatic constant temperature heating device, and computing machine continuous acquisition polarization thermal imaging system is measured and is obtained the radiation intensity information of test sample emission on three polarization directions, and the anglec of rotation of corresponding automatically controlled universal stage, this anglec of rotation is and gathers detection angle corresponding to described radiation intensity information, computing machine is measured to each polarization thermal imaging system gathered the data obtaining the radiation intensity information of survey sample emission on three polarization directions and is carried out data processing, obtain the Stokes vector of testing sample, the information such as linear polarization degree and angle, polarization direction.
The beneficial effect that the device of multiangular measurement object polarization characteristic of the present invention and measuring method are brought is: the radiation polarisation information that directly can obtain arbitrarily angled upper object; Also directly can obtain object polarization characteristic along with observation angle and temperature variation relation; Adopt the device of multiangular measurement object polarization characteristic of the present invention and measuring method measuring process simple, measurement mechanism is full-automatic, takes measurement of an angle without the need to artificial adjustment.
Accompanying drawing explanation
Fig. 1 is the physical construction schematic diagram of the device of multiangular measurement object polarization characteristic of the present invention.
Fig. 2 is the electrical principle block diagram of the device of multiangular measurement object polarization characteristic of the present invention.
Embodiment
Embodiment one: present embodiment is described see Fig. 1, the device of the multiangular measurement object polarization characteristic described in present embodiment, it is made up of heating module, rotating module, data acquisition module and data processing module; Described heating module is made up of automatic constant temperature heating device 1 and adjustable angle sample holder 2; Described rotating module is made up of automatically controlled universal stage 3 and controllor for step-by-step motor 4; Described data acquisition module is made up of lifting table 5, polarization thermal imaging system 6 and slideway 7; Described data processing module is computing machine 8;
Described automatic constant temperature heating device 1 is round platform, described adjustable angle sample holder 2 is fixed on the center of the upper surface of automatic constant temperature heating device 1, described automatic constant temperature heating device 1 is fixed on the fixed part of automatically controlled universal stage 3, the slide rail of slideway 7 is linear pattern slide rail, described linear pattern slide rail one end is fixedly connected with the sidewall of the rotating part of automatically controlled universal stage 3, and the elongated central line of this linear pattern slide rail is crossing with the rotation center of automatically controlled universal stage 3; The slide block upper surface of slideway 7 is fixed with lifting table 5, the table top of described lifting table 5 is fixed with polarization thermal imaging system 6, the optical axis of described polarization thermal imaging system 6 is crossing with the extended line of the turning axle of automatically controlled universal stage 3, the data signal output of described polarization thermal imaging system 6 is connected with the data signal input of computing machine 8, the universal stage control signal output terminal of described computing machine 8 is connected with the control signal input end of automatically controlled universal stage 3, and the heating signal output part of described computing machine 8 is connected with the control signal input end of automatic constant temperature heating device 1.
Embodiment two: the difference of the device of multiangular measurement object polarization characteristic described in present embodiment and embodiment one is, described automatic constant temperature heating device 1 is cylindrical.
Embodiment three: the device of present embodiment and the multiangular measurement object polarization characteristic described in embodiment one is distinguished and is, the table top of described lifting table 5 vertically moves up and down, and makes the vertical height of the optical axis of polarization thermal imaging system 6 distance slideway 7 be more than or equal to the vertical height of upper surface apart from slideway 7 of automatic constant temperature heating device 1.
Embodiment four: the device of present embodiment and the multiangular measurement object polarization characteristic described in embodiment three is distinguished and is, the polaroid of described polarization thermal imaging system 6 is provided with 0 °, 60 ° and 120 ° of three polarization directions simultaneously.
The radiation intensity information on 0 °, 60 ° and 120 ° of three polarization directions measured by polarization thermal imaging system 6 simultaneously.
Embodiment five: present embodiment is described see Fig. 1, adopts the device of multiangular measurement object polarization characteristic described in embodiment one to realize the measuring method of multi-angle object polarization characteristic as follows:
First, by the angle of adjustment polarization thermal imaging system 6, the central axis of the optical axis of polarization thermal imaging system 6 and automatic constant temperature heating device 1 is intersected at a point, secondly, test sample is placed on adjustable angle sample holder 2, then controlled by computing machine 8 pairs of automatic constant temperature heating devices 1, after making the temperature of test sample keep a certain fixed temperature, automatically controlled universal stage 3 is driven to do 360 degree of rotations by computing machine 8 control step electric machine controller 4 again, thus drive polarization thermal imaging system 6 to circle, in the process that polarization thermal imaging system 6 circles, computing machine 8 continuous acquisition polarization thermal imaging system 6 is measured and is obtained the radiation intensity information of test sample emission on three polarization directions, and the anglec of rotation of corresponding automatically controlled universal stage 3, this anglec of rotation is and gathers detection angle corresponding to described radiation intensity information, computing machine 8 carries out data processing to each radiation intensity information of test sample emission on three polarization directions gathered, obtain the Stokes vector of test sample, linear polarization degree and polarization direction angle information, and by the Stokes vector of obtained test sample, linear polarization degree and polarization direction angle information and corresponding detection angle are as one group of data.
Embodiment six: the difference that present embodiment and the multi-angle described in embodiment five test the measuring method of sample polarization characteristic is, the process that described computing machine 8 carries out data processing to each radiation intensity information of test sample emission on three polarization directions gathered is as follows:
The light intensity I'(θ that polarization thermal imaging system 6 detects) available (3) formula represents:
I'(θ)=(I+Qcos2θ+Usin2θ)/2 （3）
Polarization thermal imaging system 6 detects and obtains I'(0), I'(60) and radiation intensity information I'(120), I, Q and U tri-amount can be calculated by formula (4);
By calculating I, Q and U, and bring I, Q and U of obtaining into formula (2):
That is, linear polarization degree and angle, polarization direction is calculated.
Obtain linear polarization degree and angle, polarization direction by present embodiment, in conjunction with automatically controlled universal stage 3 rotation angle information that computing machine 8 gathers, obtain the relation that polarization information changes along with angle.
Realized the measuring method of multi-angle object polarization characteristic by the device of multiangular measurement object polarization characteristic of the present invention and this device, also directly can obtain the relation of polarization information along with temperature variation.
Claims (5)
1. the device of multiangular measurement object polarization characteristic, it is made up of heating module, rotating module, data acquisition module and data processing module;
Described heating module is made up of automatic constant temperature heating device (1) and adjustable angle sample holder (2); Described rotating module is made up of automatically controlled universal stage (3) and controllor for step-by-step motor (4); Described data acquisition module is made up of lifting table (5), polarization thermal imaging system (6) and slideway (7); Described data processing module is computing machine (8);
Described automatic constant temperature heating device (1) is round platform, described adjustable angle sample holder (2) is fixed on the center of the upper surface of automatic constant temperature heating device (1), described automatic constant temperature heating device (1) is fixed on the fixed part of automatically controlled universal stage (3), the slide rail of slideway (7) is linear pattern slide rail, described linear pattern slide rail one end is fixedly connected with the sidewall of the rotating part of automatically controlled universal stage (3), and the elongated central line of this linear pattern slide rail is crossing with the rotation center of automatically controlled universal stage (3), the slide block upper surface of slideway (7) is fixed with lifting table (5), the table top of described lifting table (5) is fixed with polarization thermal imaging system (6), the optical axis of described polarization thermal imaging system (6) is crossing with the extended line of the turning axle of automatically controlled universal stage (3), the data signal output of described polarization thermal imaging system (6) is connected with the data signal input of computing machine (8), the universal stage control signal output terminal of described computing machine (8) is connected with the control signal input end of automatically controlled universal stage (3), the heating signal output part of described computing machine (8) is connected with the control signal input end of automatic constant temperature heating device (1),
It is characterized in that, the table top of described lifting table (5) vertically moves up and down, and makes the vertical height of the optical axis of polarization thermal imaging system (6) distance slideway (7) be more than or equal to the vertical height of upper surface apart from slideway (7) of automatic constant temperature heating device (1).
2. the device of multiangular measurement object polarization characteristic according to claim 1, is characterized in that, described automatic constant temperature heating device (1) is for cylindrical.
3. the device of multiangular measurement object polarization characteristic according to claim 1, is characterized in that, the polaroid of described polarization thermal imaging system (6) is provided with 0 °, 60 ° and 120 ° of three polarization directions simultaneously.
4. adopt the device of multiangular measurement object polarization characteristic according to claim 1 to realize the measuring method of multi-angle object polarization characteristic, it is characterized in that, the method is as follows:
First, by the angle of adjustment polarization thermal imaging system (6), the central axis of the optical axis of polarization thermal imaging system (6) and automatic constant temperature heating device (1) is intersected at a point, secondly, test sample is placed on adjustable angle sample holder (2), then by computing machine (8), automatic constant temperature heating device (1) is controlled, after making the temperature of test sample keep a certain fixed temperature, pass through computing machine (8) control step electric machine controller (4) again and drive automatically controlled universal stage (3) to do 360 degree of rotations, thus drive polarization thermal imaging system (6) to circle, in the process that polarization thermal imaging system (6) circles, computing machine (8) continuous acquisition polarization thermal imaging system (6) is measured and is obtained the strength information of test sample emission on three polarization directions, and the anglec of rotation of corresponding automatically controlled universal stage (3), this anglec of rotation is and gathers detection angle corresponding to described strength information, computing machine (8) carries out data processing to each strength information of test sample emission on three polarization directions gathered, obtain the Stokes vector of test sample, linear polarization degree and polarization direction angle information, and by the Stokes vector of obtained test sample, linear polarization degree and polarization direction angle information and corresponding detection angle are as one group of data.
5. the device of employing multiangular measurement object polarization characteristic according to claim 4 realizes the measuring method of multi-angle object polarization characteristic, it is characterized in that, the process that described computing machine (8) carries out data processing to each strength information of test sample emission on three polarization directions gathered is as follows:
The light intensity I'(θ that polarization thermal imaging system (6) detects) available (3) formula represents:
I'(θ)＝(I+Qcos2θ+Usin2θ)/2 (3)
In formula: I'(θ) represent the radiant quantity of test sample emission on θ direction;
θ represents the angle of light transmission shaft direction relative to horizontal direction of polarization thermal imaging system (6) interior polaroid;
I represents the total light intensity of test sample emission;
Q represents level and vertical direction light intensity difference;
U represents 45 ° of direction linear polarization light intensity difference;
Polarization thermal imaging system (6) detects and obtains I'(0), I'(60) and radiation intensity I'(120), I, Q and U tri-amount can be calculated by formula (4);
By calculating I, Q and U, and bring I, Q and U of obtaining into formula (2):
that is, linear polarization degree and angle, polarization direction is calculated,
In formula, P represents linear polarization degree;
α represents angle, polarization direction;
V represents circular polarization amount, gets V=0.
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| CN104296875B (en) * | 2014-09-25 | 2017-01-25 | 中国科学院光电技术研究所 | Light beam polarization degree measuring device and method |
| CN108267228A (en) * | 2016-12-30 | 2018-07-10 | 南京理工大学 | A kind of atmospheric scattering light polarization analysis method based on CE318 heliographs |
| CN110672239B (en) * | 2019-07-15 | 2021-07-30 | 中国人民解放军陆军工程大学 | Method for selecting optimal incident polarization state in optical fiber pressure sensing based on Stokes parameters |
| CN111121666B (en) * | 2019-12-25 | 2021-07-16 | 联想(北京)有限公司 | Angle determination method and electronic equipment |
| CN111380809B (en) * | 2020-05-06 | 2021-08-20 | 长春理工大学 | Method for testing oil film type based on polarization characteristic |
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| JP2012083311A (en) * | 2010-10-14 | 2012-04-26 | Horiba Ltd | Polarimeter |
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| US8305578B1 (en) * | 2009-05-01 | 2012-11-06 | Lockheed Martin Corporation | Imaging polarimeter |
| CN101672696A (en) * | 2009-09-14 | 2010-03-17 | 清华大学 | Light polarization detection instrument |
| CN101968453A (en) * | 2009-12-01 | 2011-02-09 | 北京理工大学 | Polarization detection method and device for white and colorless foreign matters in cotton |
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