CN109738160B - Multi-optical-axis consistency testing device and method based on laser communication system - Google Patents
Multi-optical-axis consistency testing device and method based on laser communication system Download PDFInfo
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- CN109738160B CN109738160B CN201811635324.7A CN201811635324A CN109738160B CN 109738160 B CN109738160 B CN 109738160B CN 201811635324 A CN201811635324 A CN 201811635324A CN 109738160 B CN109738160 B CN 109738160B
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Abstract
The invention discloses a multi-optical-axis consistency testing device based on a laser communication system, which comprises an afocal optical device, a laser emitting device, a laser receiving device, a spectroscope, a two-dimensional deflection mirror and a reflector, wherein the afocal optical device is arranged on the outer side of the optical device; the laser emitting device is used for emitting a plurality of lasers; the afocal optical device is used for receiving laser; the laser receiving device is used for receiving the reflected laser and the laser emitted by the product to be detected, and the reflected laser is coaxial with the laser received by the product to be detected; a spectroscope and a two-dimensional deflection mirror are sequentially arranged between the laser emitting device and the afocal optical device; the spectroscope is used for splitting a plurality of lasers emitted by the laser emitting device and transmitting the split lasers to the two-dimensional deflection mirror, and is used for transmitting the lasers emitted by the to-be-detected product and received by the afocal optical device and the emitted lasers to the laser receiving device; the reflector is arranged between the afocal optical device and the product to be measured. The method is applied to the optical axis consistency detection of the multi-wavelength laser communication system.
Description
Technical Field
The invention relates to the field of free space laser communication, in particular to a multi-optical-axis consistency testing device and method based on a laser communication system.
Background
The free space laser communication is a communication mode for realizing remote data transmission by taking laser as an information carrier, a free space laser communication system generally comprises a communication light emitting branch, a beacon light emitting branch, a communication light receiving branch and the like, each branch corresponds to a respective optical axis, and the consistency of multiple optical axes of a communication light emitting axis, a beacon light emitting axis, a communication light receiving axis and the like in the space laser communication system directly determines the establishment of a remote communication link and the quality of communication performance, so that very high requirements are provided for the consistency of the multiple optical axes of the space laser communication.
In the conventional multi-optical axis consistency testing and calibrating device, a large-aperture collimator is generally adopted, a light source of the collimator adopts a wide-spectrum light source such as a halogen tungsten lamp and a bromine tungsten lamp, and when the collimator of the wide-spectrum light source is used for calibrating multiple optical axes of the laser communication system, the energy utilization rate of specific wavelengths is low, so that the testing and calibration of the multiple optical axes are influenced.
The consistency requirements of the optical axes of different branches are different, wherein the highest requirement is the coaxiality of the fine tracking optical axis, the communication transmitting optical axis and the communication receiving optical axis; the visual field of the communication receiving branch is in micro-radian order, the beam divergence angle of communication emission is close to the diffraction limit of the optical system, and the beam divergence angle is also in micro-radian order, so that the requirement on the alignment precision of the fine tracking optical axis and the visual axis of the communication emission optical axis and the communication receiving optical axis is also in micro-radian order.
The high precision of the multi-optical axis consistency is a problem which must be solved to ensure long-distance laser communication, and therefore, the method is particularly important for detecting the multi-optical axis consistency.
Disclosure of Invention
In view of the defects in the prior art, an object of the present invention is to provide a device and a method for testing consistency of multiple optical axes based on a laser communication system, which can be applied to optical axis consistency detection of a laser communication system with multiple wavelengths.
In order to achieve the above object, in a first aspect, an embodiment of the present invention provides a multi-optical axis consistency testing apparatus based on a laser communication system, where the multi-optical axis consistency testing apparatus is applied to an optical axis consistency test of a product to be tested that emits multiple lasers, and includes a afocal optical apparatus, a laser emitting apparatus, a laser receiving apparatus, a spectroscope, a two-dimensional yaw mirror, and a reflector;
the laser emitting device is used for emitting a plurality of lasers;
the afocal optical device is used for receiving laser emitted by the laser emitting device, the laser emitted by the laser emitting device after being reflected by the reflecting mirror, and the laser emitted by the product to be tested and having the same wavelength as the laser emitted by the laser emitting device;
the laser receiving device is used for receiving the reflected laser and the laser emitted by the product to be detected, and the reflected laser and the laser received by the product to be detected are coaxial;
the spectroscope and the two-dimensional deflection mirror are sequentially arranged between the laser emitting device and the afocal optical device; the spectroscope is used for splitting the plurality of laser beams emitted by the laser emitting device and transmitting the split laser beams to the two-dimensional deflection mirror, and the spectroscope is used for transmitting the laser beams emitted by the product to be tested and received by the afocal optical device and the emitted laser beams to the laser receiving device; the two-dimensional deflection mirror is used for changing the direction of the laser;
the reflector is arranged between the afocal optical device and the product to be detected and used for returning the laser emitted by the laser emitting device to the laser receiving device along the original path.
On the basis of the above technical solution, the multi-optical axis consistency testing apparatus further includes:
and the control system is connected with the two-dimensional deflection mirror and is used for controlling the deflection angle of the two-dimensional deflection mirror.
On the basis of the above technical solution, the control system includes:
and the calculation module is connected with the laser receiving device and is used for calculating the deviation between an emission optical axis formed by the laser emitted by the product to be detected and a receiving optical axis formed by the laser emitted by the laser emitting device.
On the basis of the above technical solution, the laser emitting apparatus includes:
a visible light emitting device for integrating visible light of a plurality of wavelengths; the visible light emitting device comprises a first wavelength division multiplexer, a first collimating mirror connected with the output end of the first wavelength division multiplexer, and a plurality of lasers connected with the input end of the first wavelength division multiplexer and used for emitting a beam of visible light;
near-infrared light emitting means for integrating near-infrared light of a plurality of wavelengths; the near-infrared light emitting device comprises a second wavelength division multiplexer, a second collimating mirror connected with the output end of the second wavelength division multiplexer, and a plurality of lasers which are connected with the input end of the second wavelength division multiplexer and used for emitting a beam of near-infrared light;
an emission spectrum spectroscope for separating visible light and near infrared light; the emission spectrum spectroscope is arranged between the spectroscope and the first collimating mirror; the emission spectrum spectroscope is arranged between the spectroscope and the second collimating mirror.
On the basis of the above technical solution, the laser receiving apparatus includes:
a visible light receiving device for receiving visible light;
near-infrared light receiving means for receiving near-infrared light;
and the receiving spectrum spectroscope is arranged between the spectroscope and the visible light receiving device and between the spectroscope and the near infrared light receiving device.
On the basis of the above technical solution, the multi-optical axis consistency testing apparatus further includes:
the control system is connected with the two-dimensional deflection mirror and is used for controlling the deflection angle of the two-dimensional deflection mirror;
the control system includes:
the computing module is respectively connected with the visible light receiving device and the near infrared light receiving device; the calculation module is used for calculating the deviation between an emission optical axis formed by the visible light emitted by the product to be measured and a receiving optical axis formed by the visible light emitted by the laser emission device,
calculating the deviation between an emission optical axis formed by the near infrared light emitted by the product to be detected and a receiving optical axis formed by the near infrared light emitted by the laser emission device,
and calculating the deviation between a receiving optical axis formed when the miss distance of the receiving detector in the product to be detected is zero and a receiving optical axis formed by receiving the near infrared light emitted by the laser emitting device.
In a second aspect, an embodiment of the present invention further provides a multi-optical axis consistency testing method, where based on the above testing apparatus, the multi-optical axis consistency testing method includes:
the laser emitting device emits laser;
adjusting the deflection angle of the two-dimensional deflection mirror to a preset position;
recording the spot position of the laser emitted by the laser emitting device which returns to the laser receiving device along the original path after being reflected by the reflector;
and the product to be tested emits laser with the same wavelength as the laser emitted by the laser emitting device, and the position of a light spot of the laser emitted by the product to be tested in the laser receiving device is recorded.
On the basis of the above technical scheme, when the laser emitting device emits a beam of laser, the laser emitted by the laser emitting device is reflected by the reflector and then returns to the laser receiving device along the original path, and the position of the spot in the laser receiving device of the laser emitted by the product to be tested is recorded as (Xm, Ym), the position of the spot in the laser receiving device of the laser emitted by the product to be tested is recorded as (Xn, Yn), and the step of the multi-optical-axis consistency testing method further includes:
calculating the deviation theta between the transmitting optical axis formed by the laser emitted by the product to be tested and the receiving optical axis formed by the laser emitted by the laser emitting device according to the recorded spot position (Xm, Ym) and the recorded spot position (Xn, Yn), wherein the calculation formula is as follows:
in the formula, Xm and Ym are respectively the horizontal and vertical coordinates of the spot position of the emission optical axis, Xn and Yn are respectively the horizontal and vertical coordinates of the spot position of the reception optical axis, a is the pixel of the laser receiving device, and f is the focal length of the laser receiving device.
On the basis of the technical scheme, the preset position is adjusted by the following steps:
when a product to be detected is placed outside an afocal optical device to detect the laser and the product to be detected displays a power value, adjusting the deflection angle of the two-dimensional deflection mirror, and recording the position of the two-dimensional deflection mirror with the maximum display power of the product to be detected, wherein the position of the two-dimensional deflection mirror is a preset position.
On the basis of the technical scheme, the laser emitting device comprises a visible light emitting device and a near infrared light emitting device, and the laser receiving device comprises a visible light receiving device and a near infrared light receiving device; the multi-optical-axis consistency testing method specifically comprises the following steps:
the visible light emitting device and the near infrared light emitting device respectively emit a visible light beam and a near infrared light beam, and the positions of light spots of the visible light and the near infrared light reflected in the visible light receiving device and the near infrared light receiving device respectively through the reflector are recorded;
the product to be detected sequentially emits laser with the same wavelength as the visible light and the near infrared light, and the light spot positions of the laser emitted by the product to be detected in the visible light receiving device and the near infrared light receiving device are recorded;
and the product to be tested emits laser with the same wavelength as the visible light again, the deflection angle of the two-dimensional deflection mirror is adjusted until the miss distance of a receiving detector in the product to be tested is zero, and the position of a light spot of the laser with the same wavelength as the visible light emitted by the product to be tested in the visible light receiving device again is recorded.
Compared with the prior art, the invention has the advantages that:
according to the multi-optical-axis consistency testing device and method based on the laser communication system, the laser communication system needs to be transmitted in a long distance, so that the multi-optical-axis consistency of the laser communication system is necessarily tested and checked, the precision requirement on optical axis adjustment is correspondingly high, and the two-dimensional deflection mirror can realize adjustment on micro-arc degree magnitude; meanwhile, each type of light also has a certain wavelength range, so that the requirement of being capable of emitting light with multiple wavelengths and meeting the consistency detection of different light in different wave bands of a laser communication system is met.
Drawings
Fig. 1 is a schematic structural diagram of a multi-optical-axis consistency testing device based on a laser communication system in an embodiment of the present invention;
in the figure: 1-a first off-axis parabolic reflector, 2-a second off-axis parabolic reflector, 3-a two-dimensional deflection mirror, 4-a spectroscope, 5-a receiving spectrum spectroscope, 6-a first converging lens, 7-a visible light detector, 8-a second converging lens, 9-a near infrared light detector, 10-an emitting spectrum spectroscope, 11-a first collimating mirror, 12-a first wavelength division multiplexer, 13-a second collimating mirror, 14-a second wavelength division multiplexer, 15-a control system, 16-a pyramid reflector, 17-a first attenuation sheet, 18-a second attenuation sheet and 19-a product to be measured.
Detailed Description
The technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. It is to be noted that all the figures are exemplary representations. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The present invention will be described in further detail below with reference to specific embodiments and with reference to the attached drawings.
Examples
Referring to fig. 1, an embodiment of the present invention provides a multi-optical axis consistency testing apparatus based on a laser communication system, where the multi-optical axis consistency testing apparatus is applied to an optical axis consistency test of a product 19 to be tested that emits multiple lasers, and includes an afocal optical apparatus, a laser emitting apparatus, a laser receiving apparatus, a spectroscope 4, a two-dimensional deflection mirror 3, and a reflecting mirror;
the laser emitting device is used for emitting a plurality of lasers;
the afocal optical device is used for receiving the laser emitted by the laser emitting device, the laser emitted by the laser emitting device after being reflected by the reflecting mirror, and the laser emitted by the product to be tested 19 and having the same wavelength as the laser emitted by the laser emitting device;
the laser receiving device is used for receiving the reflected laser and the laser emitted by the product to be detected 19, and the reflected laser and the laser received by the product to be detected 19 are coaxial;
the spectroscope 4 and the two-dimensional deflection mirror 3 are sequentially arranged between the laser emitting device and the afocal optical device; the spectroscope 4 is configured to split a plurality of laser beams emitted by the laser emission device and transmit the split laser beams to the two-dimensional yaw mirror 3, and is configured to transmit the laser beams emitted by the product 19 to be tested and received by the afocal optical device and the emitted laser beams to the laser receiving device; specifically, the spectroscope 4 is a spectral spectroscope 4; the two-dimensional deflection mirror 3 is used for changing the direction of the laser;
the reflector is arranged between the afocal optical device and the product 19 to be detected and used for returning the laser emitted by the laser emitting device to the laser receiving device along the original path.
According to the multi-optical-axis consistency testing device and method based on the laser communication system, the laser communication system needs to be transmitted in a long distance, so that the multi-optical-axis consistency of the laser communication system is necessarily tested and checked, the precision requirement on optical axis adjustment is correspondingly high, and the two-dimensional deflection mirror 3 can be adjusted in the micro-arc degree order; meanwhile, each type of light also has a certain wavelength range, so that the requirement of being capable of emitting light with multiple wavelengths and meeting the consistency detection of different light in different wave bands of a laser communication system is met.
Specifically, the afocal optical device is composed of a first off-axis parabolic reflector 1 and a second off-axis parabolic reflector 2, and the second off-axis parabolic reflector 2 and the two-dimensional deflection mirror 3 are arranged oppositely to transmit laser light.
As a preferable mode of this embodiment, the multi-optical axis consistency testing apparatus further includes a control system 15, which is connected to the two-dimensional deflection mirror 3, and is configured to control a deflection angle of the two-dimensional deflection mirror 3 and enable adjustment in a micro-radian order, so as to improve measurement accuracy of optical axis consistency.
Further, the control system 15 includes a calculating module, connected to the laser receiving device, for calculating a deviation between an emitting optical axis formed by the laser emitted from the product 19 to be measured and a receiving optical axis formed by the laser emitted from the laser emitting device. The deviation between the transmitting optical axis and the receiving optical axis of the product 19 to be measured is processed by utilizing the computing module in the control system 15, compared with manual computation, the method is convenient and fast, and the efficiency is obvious.
As an embodiment of the present invention, the laser emitting device includes a visible light emitting device, a near infrared light emitting device, and an emission spectrum spectroscope 10; the visible light emitting device is used for integrating visible light with multiple wavelengths, and comprises a first wavelength division multiplexer 12, a first collimating mirror 11 connected with the output end of the first wavelength division multiplexer 12, and multiple lasers which are connected with the input end of the first wavelength division multiplexer 12 and used for emitting a beam of visible light; the near-infrared light emitting device is used for integrating near-infrared light with multiple wavelengths, and comprises a second wavelength division multiplexer 14, a second collimating mirror 13 connected with the output end of the second wavelength division multiplexer 14, and multiple lasers which are connected with the input end of the second wavelength division multiplexer 14 and used for emitting a beam of near-infrared light; the emission spectrum spectroscope 10 is used for separating visible light and near infrared light, and the emission spectrum spectroscope 10 is arranged between the spectroscope 4 and the first collimating mirror 11; the emission spectrum spectroscope 10 is arranged between the spectroscope 4 and the second collimating mirror 13; specifically, the emission spectrum spectroscope 10 is connected to both the first collimating mirror 11 and the second collimating mirror 13.
Further, the laser receiving device includes a visible light receiving device for receiving visible light, a near infrared light receiving device for receiving near infrared light, and a receiving spectrum spectroscope 5; the receiving spectrum spectroscope 5 is arranged between the spectroscope 4 and the visible light receiving device and between the spectroscope 4 and the near infrared light receiving device. The visible light receiving device comprises a visible light detector 7 and a first convergent lens 6 connected with the visible light detector 7; the near infrared light receiving device comprises a near infrared light detector 9 and a second converging lens connected with the near infrared light detector 9; the receiving spectrum spectroscope 5 is connected with the first converging lens 6 and the second converging lens 8.
Because the visible light detector 7 can only detect visible light and the near infrared light detector 9 can only detect near infrared light, two laser emitting devices and corresponding laser receiving devices are arranged, the visible light wave band and the near infrared light wave band respectively have a plurality of wavelengths, and a plurality of emitters are designed to be connected to the wavelength division multiplexer, so that the laser emission of the plurality of wave bands is realized without mutual influence of the first wavelength division multiplexer 12 and the second wavelength division multiplexer 14, and other components in the testing device are not changed.
Further, the laser light receiving device further includes a first attenuation sheet 17 and a second attenuation sheet 18; a first attenuation sheet 17 is disposed between the first focusing lens 6 and the receiving spectral beam splitter 5; a second attenuation plate 18 is disposed between the second condenser lens 8 and the reception spectrum beam splitter 5. The proper attenuation sheet is selected to adapt to light beams with different energies, and the method has strong engineering practical value.
In the embodiment of the present invention, the reflector is the corner cube reflector 16, and the corner cube reflector 16 does not need to be moved during the use operation, thereby avoiding the defect that the reflector needs to be moved during the use of the movable plane reflector and simplifying the operation process.
Therefore, the control system 15 includes a computing module, which is connected to the visible light receiving device and the near infrared light receiving device respectively; the calculation module is used for calculating the deviation between the transmitting optical axis formed by the visible light emitted by the product 19 to be detected and the receiving optical axis formed by the visible light emitted by the laser emission device, calculating the deviation between the transmitting optical axis formed by the near infrared light emitted by the product 19 to be detected and the receiving optical axis formed by the near infrared light emitted by the laser emission device, and calculating the deviation between the receiving optical axis formed by the visible light received by the product 19 to be detected when the miss distance of the receiving detector in the product 19 to be detected is zero and the receiving optical axis formed by the near infrared light emitted by the laser emission device. Therefore, the spectroscope 4 can transmit one visible light beam and one near infrared light beam emitted by the visible light emitting device and the near infrared light emitting device through the spectroscope 4 to form two parallel light beams, namely, the receiving optical axes of the visible light beam and the near infrared light beam emitted by the product 19 to be measured are coaxial, and the laser receiving devices where the light spot forming positions are located are different due to different wavelengths, so that if a plurality of lasers received by the product 19 to be measured are compared, the receiving optical axes of the visible light beam or the near infrared light beam emitted by the product 19 to be measured can be converted; when the miss distance of the receiving detector in the product 19 to be measured is zero, the receiving optical axis formed by the visible light emitted by the product 19 to be measured and the receiving optical axis of the receiving detector in the product 19 to be measured are coaxial, so that the obtained receiving optical axis formed by the visible light emitted by the product 19 to be measured is more accurate, and the deviation between the receiving optical axis formed by the visible light received by the product 19 to be measured when the miss distance of the receiving detector in the product 19 to be measured is zero and the receiving optical axis formed by the near infrared light emitted by the laser emitting device can be calculated, so that the processing of a new group of parameters on the optical axis deviation is provided, and the measuring precision of the product is further improved.
The working principle of the embodiment of the invention is as follows: the laser used for emitting a beam of visible light emits a beam of visible light, the visible light is set as beacon light, the beacon light is emitted sequentially through a first wavelength division multiplexer 12, a first collimating mirror 11, an emission spectrum spectroscope 10, a spectroscope 4, a two-dimensional deflection mirror 3, a second off-axis parabolic reflector 2 and a first off-axis parabolic reflector 1, when a product 19 to be detected detects the beacon light and the product 19 to be detected displays a power value, the deflection angle of the two-dimensional deflection mirror 3 is adjusted, and the position of the two-dimensional deflection mirror 3 with the maximum display power of the product 19 to be detected is recorded, wherein the position of the two-dimensional deflection mirror 3 is a preset position; adjusting the deflection angle of the two-dimensional deflection mirror 3 to a preset position, and closing the laser used for emitting a beam of visible light;
the laser for emitting a beam of visible light emits a beam of visible light, the laser for emitting a beam of near-infrared light emits a beam of near-infrared light, in the embodiment of the invention, the emitted visible light is beacon light, the emitted near infrared light is communication light, the beacon light and the communication light are transmitted by the spectroscope 4 to form two parallel beacon lights and communication light, and the emission of the two lights does not influence each other, the beacon light and the communication light received by the product 19 to be measured are returned along the original path by the pyramid reflecting mirror 16 between the afocal optical system and the product 19 to be measured, and respectively reflected to the visible light detector 7 and the near infrared light detector 9 when passing through the spectroscope 4, which turns off the laser for emitting a beam of visible light at the spot positions (X1, Y1) and (X2, Y2) of visible light and near infrared light recorded on the visible light detector 7 and near infrared light detector 9; the product 19 to be tested sequentially emits the laser with the same wavelength as the beacon light and the communication light, the spot positions recorded on the visible light detector 7 and the near infrared light detector 9 are (X3, Y3) and (X4, Y4), and the laser emitter of the product 19 to be tested is turned off; the product 19 to be detected emits laser with the same wavelength as the beacon light again, the deflection angle of the two-dimensional deflection mirror 3 is adjusted again until the miss distance of the receiving detector in the product 19 to be detected is zero, and the position of a light spot in the visible light receiving device at the moment is recorded (X5, Y5); and then, a calculation module in the control device is used for carrying out deviation processing calculation on the position of the light spot.
According to the above steps, calculating the deviation between the emission optical axis formed by the visible light emitted from the product 19 to be measured and the receiving optical axis formed by the visible light emitted from the laser emission device as follows:
calculating the deviation between the transmitting optical axis formed by the near infrared light emitted by the product 19 to be measured and the receiving optical axis formed by the near infrared light emitted by the laser emitting device as follows:
calculating the deviation between a receiving optical axis formed when the miss distance of the receiving detector in the product 19 to be detected of the visible light received by the product 19 to be detected is zero and a receiving optical axis formed by receiving the near infrared light emitted by the laser emitting device as follows:
in the formula, a1Is a visible light detector 7 pixel, a2Is a 9-pixel near infrared light detector, f1Is the focal length of the visible light receiving device, f2For the focal length of the near-infrared light receiving device, X1 and Y1 are respectively the horizontal coordinate and the vertical coordinate of the spot position of the receiving optical axis formed by the visible light received by the product 19 to be detected, X2 and Y2 are respectively the horizontal coordinate and the vertical coordinate of the spot position of the receiving optical axis formed by the near-infrared light received by the product 19 to be detected, X3 and Y3 are respectively the horizontal coordinate and the vertical coordinate of the spot position of the emitting optical axis formed by the visible light emitted by the product 19 to be detected, X4 and Y4 are respectively the horizontal coordinate and the vertical coordinate of the spot position of the emitting optical axis formed by the near-infrared light emitted by the product 19 to be detected, and X5 and Y5 are respectively the horizontal coordinate and the vertical coordinate of the spot position of the receiving optical axis formed when the miss distance of the receiving detector in the product 19 to be detected by the visible light received by the product 19 to.
In a second aspect, an embodiment of the present invention further provides a multi-optical axis consistency testing method, where based on the above testing apparatus, the multi-optical axis consistency testing method includes:
the laser emitting device emits laser;
adjusting the deflection angle of the two-dimensional deflection mirror 3 to a preset position;
recording the spot position of the laser emitted by the laser emitting device which returns to the laser receiving device along the original path after being reflected by the reflector;
and the product 19 to be tested emits laser with the same wavelength as the laser emitted by the laser emitting device, and the position of a light spot of the laser emitted by the product 19 to be tested in the laser receiving device is recorded.
Further, when the laser emitting device emits a beam of laser light, the laser light emitted by the laser emitting device is reflected by the mirror and then returns to the laser receiving device along the original path, and the position of the spot in the laser receiving device is recorded as (Xm, Ym), the position of the spot in the laser receiving device of the laser light emitted by the product to be tested 19 is recorded as (Xn, Yn), and the step of the multi-optical-axis consistency testing method further includes:
calculating a deviation theta of a deviation between a transmitting optical axis formed by the laser emitted by the product 19 to be tested and a receiving optical axis formed by the laser emitted by the laser emitting device according to the recorded spot position (Xm, Ym) and the spot position (Xn, Yn), wherein the calculation formula is as follows:
in the formula, Xm and Ym are respectively the horizontal and vertical coordinates of the spot position of the emission optical axis, Xn and Yn are respectively the horizontal and vertical coordinates of the spot position of the reception optical axis, a is the pixel of the laser receiving device, and f is the focal length of the laser receiving device.
Further, the adjusting step of the preset position is as follows:
when a product 19 to be detected is placed outside an afocal optical device to detect the laser and the product 19 to be detected displays a power value, the deflection angle of the two-dimensional deflection mirror 3 is adjusted, and the position of the two-dimensional deflection mirror 3 with the largest display power of the product 19 to be detected is recorded, wherein the position of the two-dimensional deflection mirror 3 is a preset position.
As a preferable mode of the embodiment of the present invention, the laser emitting device includes a visible light emitting device and a near-infrared light emitting device, and the laser receiving device includes a visible light receiving device and a near-infrared light receiving device; the multi-optical-axis consistency testing method specifically comprises the following steps:
the visible light emitting device and the near infrared light emitting device respectively emit a visible light beam and a near infrared light beam, and the positions of light spots of the visible light and the near infrared light reflected in the visible light receiving device and the near infrared light receiving device respectively through the reflector are recorded;
the product 19 to be tested sequentially emits laser with the same wavelength as the visible light and the near infrared light, and the positions of light spots of the laser emitted by the product 19 to be tested in the visible light receiving device and the near infrared light receiving device are recorded;
and the product 19 to be tested emits the laser with the same wavelength as the visible light again, the deflection angle of the two-dimensional deflection mirror 3 is adjusted until the miss distance of the receiving detector in the product 19 to be tested is zero, and the position of the light spot of the laser with the same wavelength as the visible light emitted by the product 19 to be tested in the visible light receiving device again is recorded.
The following is a description of specific embodiments:
the laser used for emitting a beam of visible light emits a beam of visible light, the visible light is set as beacon light, the beacon light is emitted sequentially through a first wavelength division multiplexer 12, a first collimating mirror 11, an emission spectrum spectroscope 10, a spectroscope 4, a two-dimensional deflection mirror 3, a second off-axis parabolic reflector 2 and a first off-axis parabolic reflector 1, when a product 19 to be detected detects the beacon light and the product 19 to be detected displays a power value, the deflection angle of the two-dimensional deflection mirror 3 is adjusted, and the position of the two-dimensional deflection mirror 3 with the maximum display power of the product 19 to be detected is recorded, wherein the position of the two-dimensional deflection mirror 3 is a preset position; adjusting the deflection angle of the two-dimensional deflection mirror 3 to a preset position, and closing the laser used for emitting a beam of visible light;
the laser for emitting a beam of visible light emits a beam of visible light, the laser for emitting a beam of near-infrared light emits a beam of near-infrared light, in the embodiment of the invention, the emitted visible light is beacon light, the emitted near infrared light is communication light, the beacon light and the communication light are transmitted by the spectroscope 4 to form two parallel beacon lights and communication light, and the emission of the two lights does not influence each other, the beacon light and the communication light received by the product 19 to be measured are returned along the original path by the pyramid reflecting mirror 16 between the afocal optical system and the product 19 to be measured, and respectively reflected to the visible light detector 7 and the near infrared light detector 9 when passing through the spectroscope 4, which turns off the laser for emitting a beam of visible light at the spot positions (X1, Y1) and (X2, Y2) of visible light and near infrared light recorded on the visible light detector 7 and near infrared light detector 9; the product 19 to be tested sequentially emits the laser with the same wavelength as the beacon light and the communication light, the spot positions recorded on the visible light detector 7 and the near infrared light detector 9 are (X3, Y3) and (X4, Y4), and the laser emitter of the product 19 to be tested is turned off; the product 19 to be detected emits laser with the same wavelength as the beacon light again, the deflection angle of the two-dimensional deflection mirror 3 is adjusted again until the miss distance of the receiving detector in the product 19 to be detected is zero, and the position of a light spot in the visible light receiving device at the moment is recorded (X5, Y5); and then, a calculation module in the control device is used for carrying out deviation processing calculation on the position of the light spot.
According to the above steps, calculating the deviation between the emission optical axis formed by the visible light emitted from the product 19 to be measured and the receiving optical axis formed by the visible light emitted from the laser emission device as follows:
calculating the deviation between the transmitting optical axis formed by the near infrared light emitted by the product 19 to be measured and the receiving optical axis formed by the near infrared light emitted by the laser emitting device as follows:
calculating the deviation between a receiving optical axis formed when the miss distance of the receiving detector in the product 19 to be detected of the visible light received by the product 19 to be detected is zero and a receiving optical axis formed by receiving the near infrared light emitted by the laser emitting device as follows:
in the formula, a1Is a visible light detector 7 pixel, a2Is a 9-pixel near infrared light detector, f1Is the focal length of the visible light receiving device, f2Is close toThe focal length of the infrared light receiving device, X1 and Y1 are respectively the abscissa and ordinate of the spot position of the receiving optical axis formed by the visible light received by the product 19 to be detected, X2 and Y2 are respectively the abscissa and ordinate of the spot position of the receiving optical axis formed by the near-infrared light received by the product 19 to be detected, X3 and Y3 are respectively the abscissa and ordinate of the spot position of the emitting optical axis formed by the visible light emitted by the product 19 to be detected, X4 and Y4 are respectively the abscissa and ordinate of the spot position of the emitting optical axis formed by the near-infrared light emitted by the product 19 to be detected, and X5 and Y5 are respectively the abscissa and ordinate of the spot position of the receiving optical axis formed by the visible light received by the product 19 to be detected when the miss distance of the receiving detector in the product 19 to be detected is zero.
According to the method provided by the embodiment of the invention, the deviation among a plurality of optical axes of the product 19 to be detected, namely the included angle among the optical axes can be obtained; the measurement precision can also be improved by measuring and averaging for multiple times, and the light spot position is obtained by a light spot mass center method, so that the light spot mass center positioning precision can be improved to 0.2 pixel precision.
According to the multi-optical-axis consistency test method based on the laser communication system, the laser communication system needs to be transmitted in a long distance, so that the multi-optical-axis consistency of the laser communication system is necessarily tested and checked, the precision requirement on optical axis adjustment is correspondingly high, and the two-dimensional deflection mirror 3 can be adjusted in the micro-arc degree order; meanwhile, each type of light also has a certain wavelength range, so that the requirement of being capable of emitting light with multiple wavelengths and meeting the consistency detection of different light in different wave bands of a laser communication system is met.
The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements are also considered to be within the scope of the present invention. Those not described in detail in this specification are within the skill of the art.
Claims (10)
1. A multi-optical-axis consistency test device based on a laser communication system is characterized in that the multi-optical-axis consistency test device is applied to optical axis consistency test of a product to be tested for emitting a plurality of lasers and comprises an afocal optical device, a laser emitting device, a laser receiving device, a spectroscope, a two-dimensional deflection mirror and a reflector;
the laser emitting device is used for emitting a plurality of lasers;
the afocal optical device is used for receiving the laser emitted by the laser emitting device, the laser emitted by the laser emitting device after being reflected by the reflecting mirror and the laser emitted by the product to be tested and having the same wavelength as the laser emitted by the laser emitting device, and sending the laser emitted by the laser emitting device after being reflected by the reflecting mirror and the laser emitted by the product to be tested to the laser receiving device;
the laser receiving device is used for receiving the reflected laser emitted by the afocal optical device and the laser emitted by the product to be detected, and the reflected laser is coaxial with the laser received by the product to be detected;
the spectroscope and the two-dimensional deflection mirror are sequentially arranged between the laser emitting device and the afocal optical device; the spectroscope is used for splitting the plurality of laser beams emitted by the laser emitting device and transmitting the split laser beams to the two-dimensional deflection mirror, and the spectroscope is used for transmitting the laser beams emitted by the product to be tested and received by the afocal optical device and the emitted laser beams to the laser receiving device; the two-dimensional deflection mirror is used for changing the direction of the laser;
the reflector is arranged between the afocal optical device and the product to be detected and used for returning the laser emitted by the laser emitting device to the laser receiving device along the original path.
2. The multi-optical axis consistency test apparatus based on a laser communication system according to claim 1, further comprising:
and the control system is connected with the two-dimensional deflection mirror and is used for controlling the deflection angle of the two-dimensional deflection mirror.
3. The multi-optical axis conformance testing device of claim 2, wherein the control system comprises:
and the calculation module is connected with the laser receiving device and is used for calculating the deviation between an emission optical axis formed by the laser emitted by the product to be detected and a receiving optical axis formed by the laser emitted by the laser emitting device.
4. The multi-optical axis consistency test device based on the laser communication system as claimed in claim 1, wherein the laser emitting device comprises:
a visible light emitting device for integrating visible light of a plurality of wavelengths; the visible light emitting device comprises a first wavelength division multiplexer, a first collimating mirror connected with the output end of the first wavelength division multiplexer, and a plurality of lasers connected with the input end of the first wavelength division multiplexer and used for emitting a beam of visible light;
near-infrared light emitting means for integrating near-infrared light of a plurality of wavelengths; the near-infrared light emitting device comprises a second wavelength division multiplexer, a second collimating mirror connected with the output end of the second wavelength division multiplexer, and a plurality of lasers which are connected with the input end of the second wavelength division multiplexer and used for emitting a beam of near-infrared light;
an emission spectrum spectroscope for separating visible light and near infrared light; the emission spectrum spectroscope is arranged between the spectroscope and the first collimating mirror; the emission spectrum spectroscope is arranged between the spectroscope and the second collimating mirror.
5. The multi-optical axis consistency test device based on the laser communication system as claimed in claim 4, wherein the laser receiving device comprises:
a visible light receiving device for receiving visible light;
near-infrared light receiving means for receiving near-infrared light;
and the receiving spectrum spectroscope is arranged between the spectroscope and the visible light receiving device and between the spectroscope and the near infrared light receiving device.
6. The multi-optical axis consistency test apparatus based on a laser communication system according to claim 5, further comprising:
the control system is connected with the two-dimensional deflection mirror and is used for controlling the deflection angle of the two-dimensional deflection mirror;
the control system includes:
the computing module is respectively connected with the visible light receiving device and the near infrared light receiving device; the calculation module is used for calculating the deviation between an emission optical axis formed by the visible light emitted by the product to be measured and a receiving optical axis formed by the visible light emitted by the laser emission device,
calculating the deviation between an emission optical axis formed by the near infrared light emitted by the product to be detected and a receiving optical axis formed by the near infrared light emitted by the laser emission device,
and calculating the deviation between a receiving optical axis formed when the miss distance of the receiving detector in the product to be detected is zero and a receiving optical axis formed by receiving the near infrared light emitted by the laser emitting device.
7. A multi-optical axis consistency test method based on the test device of claim 1, wherein the multi-optical axis consistency test method comprises the following steps:
the laser emitting device emits laser;
adjusting the deflection angle of the two-dimensional deflection mirror to a preset position;
recording the spot position of the laser emitted by the laser emitting device which returns to the laser receiving device along the original path after being reflected by the reflector;
and the product to be tested emits laser with the same wavelength as the laser emitted by the laser emitting device, and the position of a light spot of the laser emitted by the product to be tested in the laser receiving device is recorded.
8. The multi-optical axis consistency test method according to claim 7, wherein when the laser emitting device emits a laser beam, the laser beam emitted by the laser emitting device is reflected by the mirror and then returns to the laser receiving device along the original path, and the spot position of the laser beam emitted by the product to be tested in the laser receiving device is recorded as (Xm, Ym), and the spot position of the laser beam emitted by the product to be tested in the laser receiving device is recorded as (Xn, Yn), and the multi-optical axis consistency test method further comprises the following steps:
calculating the deviation theta between the transmitting optical axis formed by the laser emitted by the product to be tested and the receiving optical axis formed by the laser emitted by the laser emitting device according to the recorded spot position (Xm, Ym) and the recorded spot position (Xn, Yn), wherein the calculation formula is as follows:
in the formula, Xm and Ym are respectively the horizontal and vertical coordinates of the spot position of the emission optical axis, Xn and Yn are respectively the horizontal and vertical coordinates of the spot position of the reception optical axis, a is the pixel of the laser receiving device, and f is the focal length of the laser receiving device.
9. The multi-optical axis consistency test method according to claim 7, wherein the adjusting step of the preset position is:
when a product to be detected is placed outside an afocal optical device to detect the laser and the product to be detected displays a power value, adjusting the deflection angle of the two-dimensional deflection mirror, and recording the position of the two-dimensional deflection mirror with the maximum display power of the product to be detected, wherein the position of the two-dimensional deflection mirror is a preset position.
10. The multi-optical axis conformance test method of claim 7,
the laser emitting device comprises a visible light emitting device and a near infrared light emitting device, and the laser receiving device comprises a visible light receiving device and a near infrared light receiving device; the multi-optical-axis consistency testing method specifically comprises the following steps:
the visible light emitting device and the near infrared light emitting device respectively emit a visible light beam and a near infrared light beam, and the positions of light spots of the visible light and the near infrared light reflected in the visible light receiving device and the near infrared light receiving device respectively through the reflector are recorded;
the product to be detected sequentially emits laser with the same wavelength as the visible light and the near infrared light, and the light spot positions of the laser emitted by the product to be detected in the visible light receiving device and the near infrared light receiving device are recorded;
and the product to be tested emits laser with the same wavelength as the visible light again, the deflection angle of the two-dimensional deflection mirror is adjusted until the miss distance of a receiving detector in the product to be tested is zero, and the position of a light spot of the laser with the same wavelength as the visible light emitted by the product to be tested in the visible light receiving device again is recorded.
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| CN115996088B (en) * | 2023-03-23 | 2023-06-27 | 中国电子科技集团公司第五十四研究所 | On-orbit self-calibration device and method for satellite-borne laser communication terminal |
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