TW412888B - Polarized laser transceiver - Google Patents

Abstract

There is disclosed a polarized laser transceiver, which utilizes the linear polarized feature of the semiconductor laser, and includes a photo receiving system having a polarization detecting function and a photo inspection system to form the polarized laser transceiver. The polarization detecting process utilizes the differences of the features between the scattering light and the reflective light to enable the system to be able to detect the existence of the scattering signal, so as to increase the capability for resisting interference and being used in all-weather condition.

Description

Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 412888 4 8 13 twf / Ο Ο 2 V. Description of the Invention (/) The present invention relates to a laser detection system, and in particular to a method using polarized laser light which Transceiver with difference in polarization characteristics of scattered and reflected light to identify the presence or absence of scattered signals. The picture of Meng Zhao Meng Zhao 丨 is not a conventional laser detection system. The laser detection system includes a control circuit 10, a laser transmitter 20, and an optical receiver 30. The control circuit 10 functions as a laser power supply for the laser transmitter 20 and analyzes and processes the signals received by the optical receiver 30. The laser transmitter 20 generates laser light. When the laser detection system has a target 40 in front of the laser transmitter 20, the laser light will be reflected to the optical receiver 30 through the target 40. When the optical receiver 30 receives the reflected laser light, a signal is transmitted back to the control circuit ί0 to analyze the information of the target 40. However, in the case of poor weather conditions, the laser light will be scattered during transmission, and the optical receiver 30 will receive it at the same time. The information of the scattered light and the information of the reflected light 'are usually not easily distinguishable. 'This will cause the control circuit 10 to fail to distinguish the target information, and will greatly limit the conditions of use of the laser detection system. Therefore, the present invention provides a polarized laser light transceiver, which utilizes the linear polarization characteristics of semiconductor lasers, and cooperates with a receiving optical system and a light detection system with a polarizing function to form a set of polarized laser light transceivers. 'The present invention provides a polarized laser light transceiver, which uses a detection detection method.' Using the difference in polarization characteristics between scattered light and reflected light, the system has the ability to identify + __ diffuse reflective targets and diffuse particle targets. The ability ----------- installed -------- order --------- Please read the notes on the back before filling this page) This paper size is applicable to China Standard (CNS) A4 specification (210 xi public love) 412888 48X3Cwf / 002 A7 B7 V. Description of the invention (z) The force will further improve the system's ability to interfere with children and the use of such systems around the clock. The present invention proposes a polarized laser light transceiver, which is briefly described as follows: Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economics A linearly polarized laser diode will produce polarized light in a first direction. Emission optical system, the emission optical system includes a diaphragm and a collimator lens. The collimator lens is used to change the light beam generated by the linearly polarized laser diode into a parallel beam. The diaphragm is placed on the collimator lens and the linear polarizer. The laser diode is used to limit the beam range of the light emitting diode. Receiving optical system, the receiving optical system includes an analyzer and a Freshnel lens, the analyzer is used to pass polarized light in the second direction, and Freshnel. The lens is used to polarize in the second direction through the analyzer Light is focused. The light detection system includes a first light detector and a second light detector. The light detection system is located on the focal plane of the Freshnel lens and the first light detector is located at the second focus of the Freshnel lens. The second light detector is located on one side of the first light detector. The present invention provides a polarized laser target detection system, which is briefly described as follows: A laser trigger circuit. A linearly polarized laser diode is connected to the laser trigger circuit, which generates polarized light in a first direction. Transmitting optical system. The transmitting optical system includes a diaphragm and a collimator. The collimator is used to change a beam generated by a linearly polarized laser diode into a parallel beam. The diaphragm is placed on the collimator and the linear polarizer. The laser diode is used to limit the beam range of the light emitting diode. Receiving optical system, please read back

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f Gutter This paper size is in accordance with Chinese National Standard (CNS) A4 (210 X 297 mm). Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs. The Freshnel lens, the analyzer is used to pass the polarized light in the second direction, and the Freshnel lens is used to focus the polarized light in the second direction through the analyzer. A light detection system including a first light detector fl and a second light detector. The light detection system is located on a focal plane of a Freshne lens and the first light detector is located at a second focal point of the Freshnel lens. The second light detector is located on one side of the first light detector. The preamplifier is connected to the light detection system to amplify the signals of the first light detector and the second light detector. The signal processing circuit is connected to the pre-amplifier to process the amplified signals of the first optical detector and the second optical detector. In order to make the above-mentioned objects, features, and advantages of the present invention more comprehensible, preferred embodiments are described below in detail with the accompanying drawings, as follows:

Brief description of the drawings: I Figure 1 shows a conventional laser detection system; Figure 2 shows a schematic diagram of diffuse reflection of linearly polarized laser light; Figure 3 shows It is a schematic diagram of the particle scattering phenomenon of linearly polarized laser light; FIG. 4 is a diagram showing a polarized laser target detection system; and FIG. 5 is a diagram showing a linear polarization in a polarized laser light transceiver according to the present invention Schematic diagram of laser diode and emitting optical system; Figure 6 shows the receiving optical system and light detection system in the polarized laser light transceiver of the present invention; and this paper standard is applicable to 111 national standards (CNS) A4 specifications (2〗 〇297 x 297 mm)-Please read the precautions on the back before filling in this page) Install ---- I --- Order! — Line, 0 0 2 A7 B7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 5. Description of the invention (y) Figure 7 shows the relationship between the first detector and the second detector in the light detection system. . DESCRIPTION OF SYMBOLS: 10 control circuit 20 laser transmitter 30 optical receiver 40 target 50, 150 linearly polarized laser diode 60 transmitting optical system 70 polarized laser light transceiver 80 target 90 receiving optical system 100 light detection System 1 1 0 control circuit 120 laser trigger circuit 1 3 0 preamplifier 140 signal processing circuit 160 diaphragm. 170 collimator lens 180 diffuse reflection target (target) 190 fine particles 200 analyzer 2 2 0 F reshne 1 lens 220 light detection system c, please read the precautions on the back before filling this page) θ_pack. This paper size applies to China's national standard (CNS) A4 specification (210 X 297 mm) / 〇〇2 Α7 __Β7 ___ V. Invention Explanation (f) 23 0 The first light detector 2 4 0 The second light detector rich example first introduces the diffuse reflection phenomenon and scattering phenomenon: (1) diffuse reflection phenomenon _ as shown in Figure 2 as a linear deviation Linearly polarized laser light generated in the first direction (j direction) after the polarized laser diode 150 passes through the stop 160 and collimator 170 (^ there is no second direction at this time ( polarized laser light (direction i)) The components are represented by dashed lines. Here the first direction (j direction) and the second direction (i direction) are mutually perpendicular. When the linearly polarized laser light in the j direction hits the diffuse reflection target ΐδ (target), The reflection will produce two component colors ^ and ^ that are almost equal in the i and j directions. _ (2) The scattering phenomenon is shown in Figure 3 as a linearly polarized laser diode 150 passes through the stop. Linearly polarized laser light generated in the first direction (j direction) after 160 and collimator 170. There is no second direction (i Direction) The linearly polarized laser light (Ei) component is represented by a dashed line. Here the first direction (j direction) and the second direction (i direction) are perpendicular to each other. When the linearly polarized laser light in the j direction is At this time, the particles 190 in the atmosphere will produce a scattering phenomenon. In theory, it will only produce linearly polarized laser light in the j direction and its beam is scattered in all directions. However, after scattering, There will also be a little linearly polarized laser light in the direction or 2 At this time, the paper size is much smaller than 7 papers. Applicable to China National Standard (CNS) A4 (210x297 mm). A7. Member of the Intellectual Property Bureau of the Ministry of Economy. Printed by the Industrial and Consumer Cooperation Department. And its light beam is scattered in all directions. According to the above description, when the linearly polarized laser light hits the diffuse reflection target 180 and the particles 190 in the atmosphere, it will have different characteristics. According to these differences, the system can have The ability to identify general diffuse and diffuse targets. Refer to Figure 4 for a polarized laser target detection system. It may include a control circuit 110 and a polarized laser light transceiver 70. The control circuit Π0 further includes a laser trigger circuit 120, a preamplifier 130, and a signal processing circuit 140. The polarized laser light transceiver 70 further includes a linearly polarized laser diode 50, a transmitting optical system 60, a receiving optical system 90, and a light detecting system 100. Laser trigger circuit 120 provides linearly polarized laser diode 50

-I The required power signal, the preamplifier 130 is used to amplify the signal of the light detection system, and the signal processing circuit 140 is used to process the amplified signal of the light detection system 100. Please refer to FIG. 5, which shows a linearly polarized laser diode 150 and a transmitting optical system in the polarized laser light transceiver of the present invention. The emission optical system includes a diaphragm 160 and a collimator 170. According to this embodiment, the linearly polarized laser diode 150 is placed at the focal (first-focus) position of the collimator 170, and the diaphragm 160 is placed at the linearly polarized laser diode 150 and the collimator 170 In order to limit the beam range of the linearly polarized laser light, the collimator 170 changes the beam of the linearly polarized laser light into a parallel beam. The linearly polarized laser diode 150 and the emission optical system are located on the optical axis (emission optical axis). When linear deflection. Polarized laser II ---------------------------------------------- line " Seven, please read first Note on the back, please fill out this page again) This paper size is applicable to China National Standard (CNS) A4 specification (210 X 297 mm) A7 B7 412888 48l3twf / 002 5. Description of invention (q) Polar body! The linearly polarized laser light generated at 50 passes through the diaphragm 160 and the collimator 170 and is generated in the first direction (j direction). There is no second direction (i direction). The linearly polarized laser light (έ,) component on) is indicated by a dotted line. The first direction (j direction) and the second direction (i direction) are perpendicular to each other. Please refer to FIG. 6, which shows a receiving optical system and a light detection system 220 in the polarized laser light transceiver of the present invention. The receiving optical system includes an analyzer lens (A.L) 200 and a Freshne lens 2 10. The light detection system 220 includes a first light detector 230 and a second light detector 240. The light detection system 220 is located on the focal plane of the Freshnel lens 210 and the first light detector 230 is located on the Freshnel lens 2 I. At the focus (second focus), as shown in FIG. 7, the second light detector 24 is located on one side of the first light detector 230. The Freshnel lens 210 is placed between the analyzer 200 and the light detection system 220. The analyzer 200 can adjust the linearly polarized laser light component α] in the second direction (i direction) to pass through, and prevent the linearly polarized laser light component in the first direction (j direction) from passing through. through. The Freshnel lens 2 10 is used to focus the linearly polarized laser light component in the second direction passing through the analyzer. The receiving optical system and the first light detector 230 are located on the light truck (receiving optical axis). _ When the linearly polarized laser light in the first direction (j direction) hits the target reflection, a linearly polarized light of almost the same size in the first direction (j direction) and the second direction (i direction) will be generated. Ray's reflected light has two components. When the two components reach the analyzer 200, there is only the second direction (i. The paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm). Read the text and fill in the TL 5 paper, page order economy Printed by A7 imm of the Consumer Cooperatives of the Ministry of Intellectual Property Bureau 5. The linearly polarized laser light in the invention description (artistic direction) will pass through and through the Freshnel, the lens 210 focuses on the focus of the Freshnel lens 210 (second focus) The reflected signals at this time are all received by the first detector 230. When linearly polarized laser light in the first direction (j direction) hits particles in the atmosphere, a scattering phenomenon occurs at this time. After scattering, it is a beam scattered in all directions. When the scattered light arrives. When the analyzer 200 has a little linearly polarized laser light in the second direction (i direction), it will pass through because the scattered light is not Light in a regular direction, so the area of the light spot focused on the focal point (second focus) of the Ffeshnel lens 210 via the Freshnel lens 210 will expand, and the second detector 24 that is not in focus at this time can also receive signals. When the second detector 240 receives the signal, it can be determined that there is interference of particles scattering at this time. In addition, the reflected signal and the scattered signal can be distinguished and distinguished through the preamplifier 13 and the signal processing circuit 14 to achieve the invention. Therefore, an advantage of the present invention is to provide a light detection system with dual detectors that can identify general diffuse reflection targets and scattering particle targets. Another advantage of the present invention is to provide a polarized laser light transceiver that facilitates the linear polarization characteristics of two semiconductor lasers, and cooperates with a receiving optical system and a light detection system with a detection function to form a set of polarized laser light transceivers. Device. Another advantage of the present invention is to provide a polarized laser light transceiver, which uses a polarization detection detection method and utilizes the polarization of scattered light and reflected light to cause a difference in the general diffuse reflectivity of the system. The ability of targets and scatter particles to further improve the system's resistance to interference and such systems L 0 This paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 Gongchu) 412888 * lSl3twf / 〇〇2 A7 B7 V. Invention Explain (i) the ability to use 24/7. In summary, although the present invention has been disclosed in the preferred embodiment as above, it is not intended to limit the present invention. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Retouching, so the scope of protection of the present invention shall be determined by the scope of the appended patent application. Please read it first

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Claims (1)

6. Scope of patent application! A polarized laser light transceiver includes: a linearly polarized laser diode, the linearly polarized laser diode is capable of generating polarized light in a first direction; An emission optical system including a diaphragm and a collimator, the collimator is used to change a beam generated by the linearly polarized laser 'diode into a parallel beam, and the aperture Placed between the collimator and the linearly polarized laser diode to limit the beam range of the linearly polarized laser diode; a receiving optical system, the receiving optical system including an analyzer Mirror and a Freshnet lens, the analyzer is used to pass polarized light in a second direction, and the Freshne 丨 lens is used to pass polarized light in the second direction through the analyzer Focusing; and a light detection system including a first light detector and a second light detector, the light detection system is located on a focal plane of the Freshnel lens and the first light detector At the second focal point of one of the Freshnel lenses And the second light detector is located on one side of the first light detector. 2. The polarized laser light transceiver according to item 1 of the scope of the patent application, wherein the linearly polarized laser diode and the emission optical system are located on a transmission optical axis. 3. The polarized laser light transceiver according to item 1 of the patent application scope, wherein the linearly polarized laser diode system is located at a first focal point of the collimator lens. 4. The polarized laser light transmission and reception as described in item 1 of the scope of the patent application. The paper size applies to the Chinese National Standard (CNS) A4 specification (210X297 mm) (Please read the precautions on the back before filling this page). Order the Ministry of Economic Affairs Printed by the Intellectual Property Bureau employee consumer cooperative 1 «2888 VI. Patent application scope, where the receiving optical system and the first light detector are located on the receiving axis. '(谙 Please read the precautions on the back before filling in this page. 5. The polarized laser transceiver as described in item 1 of the patent application scope, wherein the first direction and the second direction are perpendicular to each other. 6. The polarized laser light transceiver according to item 1 of the scope of the patent application, wherein the first photodetector is configured to receive the polarized light in the second direction after the polarized light in the first direction is reflected. 7. The polarized laser light transceiver as described in item 1 of the scope of the patent application, wherein the second light detector is configured to receive the polarized light in the first direction after being scattered in the first direction. Polarized light in two directions 8. —A polarization laser target detection system includes: a laser trigger circuit; a linearly polarized laser diode is coupled to the laser trigger circuit for Generates polarized light in a first direction; an emission optical system is printed by the Consumer Cooperative of Didi ’s Intellectual Property Bureau. The emission optical system includes a diaphragm and a collimator. A beam generated by the linearly polarized laser diode Into a parallel beam, the diaphragm is placed between the collimator and the linearly polarized laser diode to limit the beam range of the linearly polarized laser diode;-receiving optics System, the receiving optical system includes an analyzer and a Freshnel lens, the analyzer is used to pass polarized light in a second direction, and the Freshnej lens is used to pass the first Focusing of polarized light in two directions; a light detection system including a first light detector; the paper size is applicable to China National Standard (CNS) A4 specification {210X297 mm) 412888 48l3twf / 002 Λδ B8 CS D8 Patent application scope and a second light detector, the light detection system is located on a focal plane of the Freshnel lens. The first light detector is located on a second focal point of the Freshnel lens and the first Two optical detectors are located on one side of the first optical detector *; a preamplifier is coupled to the optical detection system to ^ amplify the first optical detector and the second optical detector A signal; and a signal processing circuit coupled to the preamplifier The device is used to process the amplified signal of a | 1 optical detector and the second optical detector 9. The polarized laser as described in item 8 of the patent application scope ^ wherein the linearly polarized laser 2 Polar body and the emission optics Body light $ by ± 〇mW \ 10. Polarized laser 1 as described in item 8 of the scope of patent application where the linearly polarized laser diode is located at the > focal point of the collimator . 'π. The polarized laser light as described in item 8 of the scope of the patent application, wherein the receiving optical system and the first light detector are located at 1¾ 2. Please read the precautions on the back before filling in this yellow)-installation · Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 撵 Λ on the optical axis 12. The polarized laser 1 as described in item 8 of the scope of patent application, wherein the first direction and the second direction are perpendicular to each other α / _ _ 3 · The polarized laser as described in item 8 of the scope of patent application "Laser" wherein the first light detector is used to receive polarized light M in the second direction after the chemical light in the first direction is reflected. The polarization type described in item 8 of the scope of patent application The laser Y¾te_ 'wherein the second light detector is configured to receive polarized light in the second direction after the lilS light in the first direction is scattered. 14 This paper size applies to China National Standard (CNS) A4 (210 X 297 mm)