CN113176184A - Simulation device for sea surface target pBRDF measurement and use method thereof - Google Patents
Simulation device for sea surface target pBRDF measurement and use method thereof Download PDFInfo
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Abstract
The invention relates to a simulation device for measuring a sea surface target pBRDF (pBRDF) and a using method thereof, belonging to the technical field of polarized light scattering characteristic measurement analysis and photoelectric imaging, and comprising a ground rotation measuring frame, a sea surface scene simulation device, a polarized light emitting system, a receiving system and an information processing system, wherein the polarized light emitting system and the receiving system are arranged on the ground rotation measuring frame; the receiving system is electrically connected with the information processing system. The invention can simulate the fog generated on the surface of the sea by utilizing water vapor and NaCl particles indoors, can establish a sea surface target pBRDF database of different water fog humidity under different salt particle concentrations according to the measurement result of an experimental device, and can simulate aerial cloud and fog, thereby providing certain guiding significance for corresponding research.
Description
Technical Field
The invention belongs to the technical field of polarized light scattering characteristic measurement and analysis and photoelectric imaging, and particularly relates to an indoor simulation device for target pBRDF characteristic measurement in a sea fog environment and a using method thereof.
Background
Oceans account for about 71% of the total area of the earth, and with the development and exploration of oceans in various countries of the world, various new technologies such as radar detection, infrared imaging and the like are continuously proposed. In the aspects of ocean exploration and sea surface target identification, an optical measurement method is adopted, so that the method is visual, simple and convenient.
The BRDF is a basic physical quantity for describing the optical reflection characteristics of the surface of a material, and plays an important role in the research fields of ground object remote sensing, target recognition and substance classification, computer image processing and the like. In the aspect of ocean development, sea surface target polarization BRDF values under different parameters are calculated, ocean information changes are monitored in real time, and the method has important significance for maritime ship search and rescue, sea surface object distinguishing, ocean environment protection and the like.
The spatial distribution of the target reflectivity is related to the characteristics of the radiation source, the reflective properties of the target. Ocean background environment is complicated, and based on microscopic angle analysis, sea fog is used as one of natural disasters weather, so that light is continuously reflected and refracted on micro elements on the surfaces of water fog particles, normal transmission of the light is seriously influenced, and imaging contrast is reduced. Previously, the measurement of the two-way reflection distribution function was mainly performed indoors and outdoors in normal weather, and a target pBRDF measurement technique for a sea fog environment was proposed. This technique registers three disadvantages: the experiment can not be carried out at any time when the heavy fog weather occurs randomly; and a large amount of capital and manpower are consumed in the seaside experiment; the sea fog concentration can not be controlled, the experimental recorded data is lack of integrity, and a database of all parameter conditions can not be established quickly. Therefore, there is a need in the art for a new indoor analog measurement device to solve these problems.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the simulation device is used for simulating fog generated on the surface of the ocean by utilizing water vapor and NaCl particles indoors to replace an experiment that the measurement must be carried out on the spot in the ocean, is used for carrying out the measurement of the transmission characteristics of the target surface reflection polarized light under different zenith angles and azimuth angles under the influence of an ocean fog medium, confirms the interference of the ocean fog particles on the light scattering process, and provides a theoretical basis and a real data support for the selection and numerical simulation of a target polarization BRDF model in a real ocean environment.
In order to achieve the purpose, the specific technical scheme of the sea surface target pBRDF measurement simulation device and the use method thereof is as follows:
a simulation device for sea surface target pBRDF measurement comprises a ground rotation measuring frame, a sea surface scene simulation device, a polarized light emitting system, a receiving system and an information processing system, wherein the polarized light emitting system and the receiving system are both arranged on the ground rotation measuring frame;
the polarized light emitting system and the receiving system are arranged around the sponge scene simulation device and do circular motion in a certain range around a sample to be measured on the ground rotating measurement frame;
the movement range of the polarized light emitting system is smaller than that of the receiving system;
the receiving system is electrically connected with the information processing system.
Further, the ground rotation measuring frame consists of a 360-degree azimuth circular track, a 180-degree zenith arc semicircular slide rail I and a 180-degree zenith arc semicircular slide rail II, wherein the 180-degree zenith arc semicircular slide rail I and the 180-degree zenith arc semicircular slide rail II are both in sliding connection with the 360-degree azimuth circular track, and the diameter of the 180-degree zenith arc semicircular slide rail II is larger than that of the 180-degree zenith arc semicircular slide rail I;
the polarized light emitting system is fixed on a 180-degree zenith arc semicircular slide rail I, and the receiving system is fixed on a 180-degree zenith arc semicircular slide rail II.
Further, the sea surface scene simulation device comprises a water tank, a stirrer, a fog filling guide pipe, a bracket, a transparent semicircular glass ball, a sample table, a humidity detection probe and a humidity display instrument; the water tank is provided with an opening for dumping NaCl particles and purified water, and the bottom of the water tank is provided with a stirrer; one end of the transparent semicircular glass ball is provided with a fog filling guide pipe hole, and the glass ball is connected with the water tank through the fog filling guide pipe; the bottom of the glass ball is provided with a bracket, and the bracket is provided with a sample table;
and a water mist concentration detector probe is arranged at the other end of the glass ball and is electrically connected with a water mist concentration display instrument outside the glass ball.
Further, the polarized light emission system comprises a light source, a beam splitter, a diaphragm I, a light power meter, a polarizer, 1/4 glass slides and a diaphragm II, wherein the light source, the beam splitter, the diaphragm I, the light power meter, the polarizer, the 1/4 glass slides and the diaphragm II are fixed on the cross iron rod;
the light source, the beam splitter, the polarizer, the 1/4 glass slide and the diaphragm II are coaxial and are longitudinally arranged;
the beam splitter, the diaphragm I and the optical power meter are coaxial and are transversely arranged;
and after passing through the beam splitter, the light axis of the light source always irradiates the center of the optical power meter and the sample to be measured.
Further, the receiving system comprises a spectrometer and a polarization camera which are arranged on a 180-degree zenith arc semicircular sliding rail II and are transversely arranged.
Further, the information processing system comprises a computer, and the computer is used for collecting and calculating data of the receiving system and storing the data in a fixed naming format.
The invention also provides a use method of the simulation device for the pBRDF measurement of the sea surface target, which applies the indoor sea fog simulation device as claimed in any one of claims 1 to 6, and the measurement method comprises the following steps in sequence:
step one, setting incident linearly polarized light in a water mist-free environment:
fixing each experimental device, calibrating the zero position of a circular orbit, keeping an indoor completely black environment, turning on a light source, and obtaining linearly polarized light with a wide spectrum band (400 nm-760 nm) by adopting a mode of adding the light source and a polarizer; firstly, linearly polarized light in the vibration direction of 0 degree is obtained by adjusting a polarizer, and the linearly polarized light of 0 degree passes through a diaphragm II and then is shot at the center of a sample table; the other beam of light passes through the diaphragm I and then is directly irradiated to the optical power meter, and the reading is observed and kept stable;
step two, setting the variable as an emergent azimuth angle:
opening the glass ball, placing a sample on the sample table, and closing the glass ball; keeping the 180-degree zenith arc semicircular slide rail I still, and fixing an incident zenith angle and an incident azimuth angle; keeping the 180-degree zenith arc semicircular slide rail I and the 180-degree zenith arc semicircular slide rail II still, keeping an emergent zenith angle unchanged, and setting an initial value to be 0 degree; a motor on a circular orbit with 360 degrees of azimuth angles is driven, 12 position points are measured at intervals of 30 degrees in total, and a receiving system measures the scattering spectrum L of a samplesAnd shooting images for storage;
step three, setting variables as emergent zenith angles:
keeping the 180-degree zenith arc semicircular slide rail I still, and fixing an incident zenith angle and an incident azimuth angle; driving a motor of a 180-degree zenith arc semicircular slide rail II to change the emergent zenith angle into 15 degrees, and repeating the step II; sequentially changing the angle of the emergent zenith angle at intervals of 15 degrees, and circularly performing the second experimental step for 12 times in total; receiving system measuring sample scattering spectrum LsAnd shooting images for storage;
setting the variable as an incident zenith angle:
driving a motor of a 180-degree zenith arc semicircular slide rail I, changing the position of a light source to change an incident zenith angle, and repeating the second and third experimental steps;
step five, calculating target pBRDF data in the water mist-free environment:
the information processing system obtains the sample scattering spectrum L from the receiving systemsAnd calibration plate scatter spectrum LbSubstituting the following equation:
wherein theta and phi respectively represent a zenith angle and an azimuth angle, subscripts i and r respectively represent an incidence direction and a detection direction, rho (lambda) is the hemispherical reflectivity of the calibration plate, a standard white plate close to a Lambert body is selected as a reference plate, a manufacturing material is polytetrafluoroethylene, and an information processing system calculates to obtain a pBRDF value and a corresponding image of a sample and stores the pBRDF value and the corresponding image;
step six, measuring target pBRDF data under different water mist humidity environments:
filling water mist with different humidity into the glass balls according to needs, and repeating the second to fifth experimental steps; the information processing system calculates and obtains a pBRDF value and a corresponding image of the sample, and stores the pBRDF value and the corresponding image;
step seven, measuring target pBRDF data under different NaCl solution concentrations:
NaCl solutions with different concentrations are prepared according to the needs, and the experimental step six is repeated; the information processing system calculates and obtains a pBRDF value and a corresponding image of the sample, and stores the pBRDF value and the corresponding image;
step eight, continuously obtaining linearly polarized light in the vibration directions of 45 degrees, 90 degrees and 135 degrees by adopting a mode of adding a light source and a polarizer and rotating the polarizer; the method comprises the steps of obtaining wide-spectrum circularly polarized light by adopting a mode of adding a light source, a polarizer and 1/4 glass slides, adjusting an included angle between a fast axis of the glass slide and a vibration direction of a polaroid to be 45 degrees by rotating the polarizer to 45 degrees and 135 degrees, and respectively obtaining right-handed circularly polarized light and left-handed circularly polarized light. Repeating the experimental steps from two to six every time the polarization angle is selected, and totaling five major cycles;
step nine, finishing the measurement experiment:
and (4) closing the polarized light emitting system, the receiving system and the information processing system, exhausting the gas in the transparent semicircular glass ball, wiping the residual water stain of the equipment, collecting the measuring equipment and finishing the experiment.
The simulation device for measuring the sea surface target pBRDF and the use method thereof have the following advantages that: the indoor simulation device and the measurement method for sea surface target pBRDF measurement are characterized in that mist generated on the surface of a sea is simulated by utilizing water vapor and NaCl particles indoors to replace an experiment that the measurement must be carried out on the spot in the sea, the indoor simulation device and the measurement method are used for carrying out the measurement of the transmission characteristics of target surface reflection polarized light under different zenith angles and azimuth angles under the influence of a sea fog medium, the interference of the sea fog particles on a light scattering process is verified, and a theoretical basis and a real data support are provided for the selection and numerical simulation of a target pBRDF model in a real marine environment.
And a sea surface target pBRDF database with different water mist humidity under different salt particle concentrations can be established according to the measurement result of the experimental device, the real-time sea surface salt particle concentration and the water mist humidity are determined when the marine target is identified, such as ship search and rescue, so that the pBRDF value of the sea surface target measured by the receiving equipment is received, the pBRDF value of the target in the database is correspondingly searched, and the material and the positioning of the measured target are determined.
The invention can also change water mist into smoke to simulate aerial fog, and has certain guiding significance for searching targets in the sky, such as airplanes.
Drawings
Fig. 1 is a schematic block diagram of a simulation device for measuring a sea surface target pBRDF according to the present invention.
Fig. 2 is a schematic structural diagram of the ground rotation measuring stand according to the present invention.
The notation in the figure is: 1. a ground rotation measuring stand; 10. the device comprises a 360-degree azimuth circular track, 11-degree zenith arc semicircular slide rails I and 180-degree zenith arc semicircular slide rails I; 12. a 180-degree zenith arc semicircular slide rail II; 2. a sea surface scene simulation device; 20-a water tank; 21. a stirrer; 22. a mist charging pipe; 23. a support; 24. transparent semicircular glass balls; 25. a sample stage; 26. a humidity detector; 27. a humidity display; 3. a polarized light emitting system; 30. a light source; 31. a beam splitter; 32. a diaphragm I; 33. an optical power meter; 34. a polarizer; 35. 1/4 slide glass; 36. a diaphragm II; 4. a receiving system; 40. a spectrometer; 41. a polarization camera; 5. an information processing system; 50. and (4) a computer.
Detailed Description
For better understanding of the objects, structure and functions of the present invention, the following describes a simulation device for measuring a sea surface target pBRDF and a method for using the same in detail with reference to the accompanying drawings.
The simulation device is shown in figure 1, and comprises a ground rotating measuring frame 1, a sea surface scene simulation device 2, a polarized light emitting system 3, a receiving system 4 and an information processing system 5, wherein the emitting system 3 and the receiving system 4 are both arranged on the ground rotating measuring frame 1;
the polarized light emitting system 3 and the receiving system 4 are arranged around the sponge scene simulation device 2 and do circular motion in a certain range around a sample to be measured on the ground rotating measurement frame 1;
the range of motion of the polarized light emitting system 3 is smaller than that of the receiving system 4;
the receiving system 4 is electrically connected to an information processing system 5.
In this embodiment, the ground rotation measuring rack 1 is composed of a 360-degree azimuth circular track 10, a 180-degree zenith arc semicircular slide rail i 11 and a 180-degree zenith arc semicircular slide rail ii 12, the 180-degree zenith arc semicircular slide rail i 11 and the 180-degree zenith arc semicircular slide rail ii 12 are both slidably connected with the 360-degree azimuth circular track 10, and the diameter of the 180-degree zenith arc semicircular slide rail ii 12 is larger than that of the 180-degree zenith arc semicircular slide rail i 11;
the polarized light emitting system 3 is fixed on a 180-degree zenith arc semicircular slide rail I11, the receiving system 4 is fixed on a 180-degree zenith arc semicircular slide rail II 12, and the 180-degree zenith arc semicircular slide rail I11 and the 180-degree zenith arc semicircular slide rail II 12 are used for fixing the polarized light emitting system 3 and the receiving system 4 and controlling the change of a zenith angle and an azimuth angle.
In the present embodiment, the sea surface scene simulation apparatus 2 includes a water tank 20, a stirrer 21, a mist filling duct 22, a bracket 23, a transparent semi-glass ball 24, a sample stage 25, a humidity detection probe 26 and a humidity display instrument 27; an opening for dumping NaCl particles and purified water is formed in the left side of the upper end of the water tank 20, calculated NaCl gram number and water proportion are poured into the water tank 20, a stirrer 21 is arranged at the bottom of the water tank, and a stirring switch is driven to close the water tank after the solution concentration is uniformly mixed;
the left end of the transparent semicircular glass ball 24 is provided with a hole of a fog filling guide pipe 22, so that the glass ball 24 is connected with the water tank 20 and is filled with evenly stirred water fog; a bracket 23 is arranged at the middle end of the bottom of the glass ball 24, and a sample table 25 is arranged on the bracket 23; a water mist concentration detector probe 26 is arranged at the right end of the glass ball 24, the probe 26 is electrically connected with a water mist concentration display instrument 27 on the outer side of the glass ball 24, and water mist charging is stopped when the water mist concentration display instrument 27 reaches specified humidity; the glass ball 24 can be opened and closed to place a sample, and the glass material has a polarization-maintaining property.
In the present embodiment, the polarized light emitting system 3 includes a light source 30 fixed on a cross iron rod 37, a beam splitter 31, a diaphragm i 32, an optical power meter 33, a polarizer 34, an 1/4 slide 35 and a diaphragm ii 36;
the light source 30, the beam splitter 31, the polarizer 34, the 1/4 slide 35 and the diaphragm II 36 are coaxial and are arranged longitudinally;
the beam splitter 31, the diaphragm I32 and the optical power meter 33 are coaxial and are arranged transversely;
after the optical axis of the light source 30 passes through the beam splitter 31, a beam always irradiates the center of the sample to be measured; after the optical axis of the light source 30 passes through the beam splitter 31, one beam of light always irradiates the optical power meter 33, and the stability of the incident light source can be detected. If the number indicated by the optical power meter 33 is too large, the measurement can be continued after the light source with the same transmitting power is replaced, or the measurement process is suspended, and the measurement can be continued after the number indicated is stable.
In the present embodiment, the receiving system 4 includes a spectrometer 40 and a polarization camera 41 mounted on a 180 ° zenith arc semicircular slide rail ii 12, and the spectrometer 40 and the polarization camera 41 are arranged laterally; the spectrometer 40 is used for measuring a target emergent polarization scattering spectrum L; the polarization camera 41 is used for shooting the imaging state of the target under a fixed angle.
In the present embodiment, the information processing system 5 includes a computer 50 for acquiring and computing data of the receiving system 4, and storing the data in a fixed naming format.
The use method of the simulation device for the pBRDF measurement of the sea surface target comprises the following steps which are sequentially carried out:
step one, setting incident linearly polarized light in a water mist-free environment
Fixing each experimental device, calibrating the zero position of the circular orbit, keeping the indoor completely black environment, turning on the light source 30, and obtaining the linear polarized light with a wide spectrum band (400 nm-760 nm) by adopting the mode of adding the light source 30 and the polarizer 34. Firstly, linearly polarized light in the vibration direction of 0 degree is obtained by adjusting a polarizer 34, and the linearly polarized light of 0 degree passes through a diaphragm II 36 and then is emitted to the center of a sample platform 25; the other beam of light is directed through a diaphragm I32 and then through a light power meter 33 to observe the reading and keep it steady.
Step two, setting the variable as an emergent azimuth angle
The transparent semicircular glass sphere 24 is opened, a sample is placed on the sample stage 25, and the glass sphere 24 is closed. Keeping the 180-degree zenith arc semicircular slide rail I11 still, and fixing an incident zenith angle and an incident azimuth angle. Keeping the 180-degree zenith arc semicircular slide rail I11 and the 180-degree zenith arc semicircular slide rail II 12 still, keeping the emergent zenith angle unchanged, and setting the initial value to be 0 degree. The motor on the 360-degree azimuth circular track 10 is driven, and 12 position points are measured at intervals of 30 degrees. Receiving system measuring sample scattering spectrum LsAnd images are taken and stored.
Step three, setting the variable as the emergent zenith angle
Keeping the 180-degree zenith arc semicircular slide rail I11 still, and fixing an incident zenith angle and an incident azimuth angle; driving a motor of a 180-degree zenith arc semicircular slide rail II 12 to change the emergent zenith angle into 15 degrees, and repeating the step II; sequentially changing the angle of the emergent zenith angle at intervals of 15 degrees, and circularly performing the second experimental step for 12 times in total; receiving system measuring sample scattering spectrum LsAnd shooting images for storage;
step four, setting the variable as the incident zenith angle
And driving a motor I11 of the 180-degree zenith arc semicircular slide rail, changing the position of the light source 30, changing the incident zenith angle, and repeating the second and third experimental steps.
Step five, calculating target pBRDF data in the water mist-free environment
The information processing system 5 obtains the sample scattering spectrum L from the receiving system 4sAnd calibration plate scatter spectrum LbSubstituting the following equation:
wherein theta and phi respectively represent a zenith angle and an azimuth angle, subscripts i and r respectively represent an incidence direction and a detection direction, rho (lambda) is the hemispherical reflectivity of the calibration plate, a standard white plate close to a Lambert body is selected as a reference plate, and the manufacturing material is polytetrafluoroethylene. The information processing system 5 calculates and obtains a pBRDF value and a corresponding image of the sample, and uniformly names and stores the pBRDF value and the corresponding image in a mode of 'no water mist-material name-incident zenith angle-emergent azimuth angle'.
Step six, measuring target pBRDF data in different water mist humidity environments
Filling the transparent semicircular glass ball 24 with water mist with different humidity according to needs, and repeating the experimental steps from two to five; the information processing system 5 calculates and obtains a pBRDF value and a corresponding image of the sample, and uniformly names and stores the pBRDF value and the corresponding image in a mode of water mist, humidity, material name, incident zenith angle, emergent zenith angle and emergent azimuth angle.
Seventhly, measuring target pBRDF data under different NaCl solution concentrations
NaCl solutions with different concentrations are prepared according to the needs, and the experimental step six is repeated; the information processing system 5 calculates to obtain a pBRDF value and a corresponding image of the sample, and uniformly names and stores the pBRDF value and the corresponding image in a salt spray-concentration-humidity-material name-incident zenith angle-emergent azimuth angle mode.
Step eight, changing the angle of the polarized light
Linearly polarized light in the vibration directions of 45, 90 and 135 is continuously obtained by rotating the polarizer 34 in a mode of adding the polarizer 34 to the light source 30; the method comprises the steps of obtaining wide-spectrum circularly polarized light by adopting a mode of adding a polarizer 34 and a 1/4 glass slide 35 to a light source 30, adjusting an included angle between a fast axis of the glass slide 35 and a vibration direction of a polaroid to be 45 degrees and 135 degrees by rotating the polarizer, and obtaining right-handed circularly polarized light and left-handed circularly polarized light respectively. Repeating the experimental steps from two to six every time the polarization angle is selected, and totaling five major cycles;
nine steps, end of measurement experiment
And (3) closing the polarized light emitting system 3, the receiving system 4 and the information processing system 5, exhausting the gas in the transparent semicircular glass ball 24, wiping off residual water stains in the equipment, collecting the measuring equipment and finishing the experiment.
It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes in the features and embodiments, or equivalent substitutions may be made therein by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (7)
1. A simulation device for sea surface target pBRDF measurement is characterized by comprising a ground rotating measurement frame (1), a sea surface scene simulation device (2), a polarized light emitting system (3), a receiving system (4) and an information processing system (5), wherein the polarized light emitting system (3) and the receiving system (4) are both installed on the ground rotating measurement frame (1);
the polarized light emitting system (3) and the receiving system (4) are arranged around the sponge scene simulation device (2) and do circular motion in a certain range around a sample to be measured on the ground rotating measuring frame (1);
the movement range of the polarized light emitting system (3) is smaller than that of the receiving system (4);
the receiving system (4) is electrically connected with the information processing system (5).
2. The simulation device for the pBRDF measurement of the sea surface target according to claim 1, wherein the ground rotation measuring frame (1) consists of a 360-degree azimuth circular track (10), a 180-degree zenith arc semicircular slide rail I (11) and a 180-degree zenith arc semicircular slide rail II (12), the 180-degree zenith arc semicircular slide rail I (11) and the 180-degree zenith arc semicircular slide rail II (12) are both in sliding connection with the 360-degree azimuth circular track (10), and the diameter of the 180-degree zenith arc semicircular slide rail II (12) is larger than that of the 180-degree zenith arc semicircular slide rail I (11);
the polarized light emitting system (3) is fixed on a 180-degree zenith arc semicircular slide rail I (11), and the receiving system (4) is fixed on a 180-degree zenith arc semicircular slide rail II (12).
3. The sea surface target pBRDF measurement simulation device according to claim 1, characterized in that the sea surface scene simulation device (2) comprises a water tank (20), a stirrer (21), a mist filling duct (22), a bracket (23), a transparent semicircular glass ball (24), a sample table (25), a humidity detection probe (26) and a humidity display (27); an opening for dumping NaCl particles and purified water is arranged on the water tank (20), and a stirrer (21) is arranged at the bottom of the water tank; one end of the transparent semicircular glass ball (24) is provided with a hole of a fog filling guide pipe (22), and the glass ball (24) is connected with the water tank (20) through the fog filling guide pipe (22); the bottom of the glass ball (24) is provided with a bracket (23), and the bracket (23) is provided with a sample table (25);
the other end of the glass ball (24) is provided with a water mist concentration detector probe (26), and the probe (26) is electrically connected with a water mist concentration display instrument (27) on the outer side of the glass ball (24).
4. The simulation setup for the pBRDF measurement of sea surface targets according to claim 1, characterized in that the polarized light emitting system (3) comprises a light source (30), a beam splitter (31), a diaphragm i (32), a light power meter (33), a polarizer (34), 1/4 slide (35) and a diaphragm ii (36) fixed on a cross-shaped iron rod (37);
the light source (30), the beam splitter (31), the polarizer (34), the 1/4 glass slide (35) and the diaphragm II (36) are coaxial and are arranged longitudinally;
the beam splitter (31), the diaphragm I (32) and the optical power meter (33) are arranged along the same optical axis and are arranged transversely;
an optical axis of the light source (30) always irradiates a beam of light on the optical power meter (33) and the center of the sample to be measured after passing through the beam splitter (31).
5. The simulation setup for sea surface target pBRDF measurements according to claim 1, characterized in that the receiving system (4) comprises a spectrometer (40) and a polarization camera (41) mounted on a 180 ° zenith arc semi-circular slide ii (12), and the spectrometer (40) and the polarization camera (41) are arranged laterally.
6. Simulation device of a sea surface object pBRDF measurement according to claim 1, characterized in that the information processing system (5) comprises a computer (50) for collecting and computationally processing the data of the receiving system (4) and saving the data in a fixed named format.
7. Use of a simulator for the pBRDF measurement of sea surface targets, characterized in that an indoor sea fog simulator according to any of claims 1-6 is used, the measurement method comprising the following steps, in sequence:
step one, setting incident linearly polarized light in a water mist-free environment:
fixing each experimental device, calibrating the zero position of a circular orbit, keeping an indoor completely black environment, turning on a light source (30), and obtaining linearly polarized light with a wide spectrum band (400 nm-760 nm) by adopting a mode of adding the light source (30) and a polarizer (34); firstly, linearly polarized light in the vibration direction of 0 degree is obtained by adjusting a polarizer (34), and the linearly polarized light of 0 degree passes through a diaphragm II (36) and then is shot at the center of a sample table (25); another beam of light passes through a diaphragm I (32) and then is directly transmitted to a light power meter (33), and readings are observed and kept stable;
step two, setting the variable as an emergent azimuth angle:
opening the glass ball (24), placing a sample on the sample table (25), and closing the glass ball (24); keeping a 180-degree zenith arc semicircular slide rail I (11) still, and fixing an incident zenith angle and an incident azimuth angle; keeping a 180-degree zenith arc semicircular slide rail I (11) and a 180-degree zenith arc semicircular slide rail II (12) stationary, keeping an emergent zenith angle unchanged, and setting an initial value to be 0 degree; a motor on a 360-degree azimuth circular track (10) is driven, 12 position points are measured at intervals of 30 degrees in total, and a receiving system measures the scattering spectrum L of a samplesAnd shooting images for storage;
step three, setting variables as emergent zenith angles:
keeping a 180-degree zenith arc semicircular slide rail I (11) still, and fixing an incident zenith angle and an incident azimuth angle; driving a motor of a 180-degree zenith arc semicircular slide rail II (12) to change the emergent zenith angle into 15 degrees, and repeating the step II; sequentially changing the angle of the emergent zenith angle at intervals of 15 degrees, and circularly performing the second experimental step for 12 times in total; receiving system measurementsSample scattering spectrum LsAnd shooting images for storage;
setting the variable as an incident zenith angle:
driving a motor of a 180-degree zenith arc semicircular slide rail I (11), changing the position of a light source (30), changing the incident zenith angle, and repeating the second and third experimental steps;
step five, calculating target pBRDF data in the water mist-free environment:
the information processing system (5) is used for obtaining the sample scattering spectrum L from the receiving system (4)sAnd calibration plate scatter spectrum LbSubstituting the following equation:
theta and phi respectively represent a zenith angle and an azimuth angle, subscripts i and r respectively represent an incidence direction and a detection direction, rho (lambda) is the hemispherical reflectivity of a calibration plate, a standard white plate close to a Lambert body is selected as a reference plate, a manufacturing material is polytetrafluoroethylene, and an information processing system (5) calculates to obtain a pBRDF value and a corresponding image of a sample and stores the pBRDF value and the corresponding image;
step six, measuring target pBRDF data under different water mist humidity environments:
filling water mist with different humidity into the glass ball (24) according to the requirement, and repeating the experimental steps from two to five; the information processing system (5) calculates and obtains a pBRDF value and a corresponding image of the sample, and stores the pBRDF value and the corresponding image;
step seven, measuring target pBRDF data under different NaCl solution concentrations:
NaCl solutions with different concentrations are prepared according to the needs, and the experimental step six is repeated; the information processing system (5) calculates and obtains a pBRDF value and a corresponding image of the sample, and stores the pBRDF value and the corresponding image;
step eight, continuously obtaining linearly polarized light in the vibration directions of 45 degrees, 90 degrees and 135 degrees by rotating the polarizer (34) in a mode of adding the light source (30) and the polarizer (34); the method comprises the steps of obtaining circularly polarized light of a wide spectrum band by adopting a mode of adding a light source (30) into a polarizer (34) and adding 1/4 glass slides (35), adjusting an included angle between a fast axis of the glass slide (35) and a vibration direction of a polaroid to be 45 degrees by rotating the polarizer to 45 degrees and 135 degrees, and obtaining right-handed circularly polarized light and left-handed circularly polarized light respectively. Repeating the experimental steps from two to six every time the polarization angle is selected, and totaling five major cycles;
step nine, finishing the measurement experiment:
and (3) closing the polarized light emitting system (3), the receiving system (4) and the information processing system (5), exhausting the gas in the transparent semicircular glass ball (24), wiping residual water stains on the equipment, collecting the measuring equipment and finishing the experiment.
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