TWI499855B - Structure of controlling laser wavelength of lidar apparatus and method thereof - Google Patents

Description

Laser wavelength control structure of optical radar device and method thereof

The invention relates to a laser wavelength conversion component, a laser wavelength control structure of an optical radar device and a method thereof, in particular to converting a laser beam into a specific wavelength by a rapidly transforming wavelength conversion component for a specific gas gel. Laser wavelength control structure and method for qualitatively detecting optical radar equipment.

Aerogel refers to suspended particles in the air. It refers to all colloids that can be suspended in a gas, including solid, liquid, mixed solid-liquid gaseous substances, as well as toxic and non-toxic substances. The natural gas produced by the natural gas is dust ash, volcanic ash, sea salt aerosol, etc.; artificially, there are particles produced by the factory burning fossil fuels, exhaust particles emitted by vehicles, burning paper money or black smoke and soot from burning incense Wait.

The applicant has previously filed an application for the invention of the Republic of China on the "Structure and Method of Laser Telemetry Contaminants". The publication number of the case is 201040514, which is mainly through the integration of the transmitting module, the receiving module and the filter module. The combination and linkage of the group, the photomultiplier tube, the positioning module and the analysis module, applying the principle of the laser beam telemetry pollutant, and the Raman shift wave number after the backscattered light signal is reflected by the space to be measured as the scatterer The feedback is used as the basis of comparison to obtain the relevant characteristic data and corresponding relationship data of pollutant monitoring for the detection of multi-point and multi-gas mode.

Although the above patent application uses a laser beam to remotely measure air pollution However, since the detection of different contaminants requires the application of different wavelengths of laser beams, the patent only discloses the technique of emitting a laser beam of a specific wavelength by a laser emitter, but how to change the wavelength of the laser beam. And how to make the operation of changing the wavelength of the laser beam faster, the patent does not propose a solution. Therefore, when there is more than one type of pollutant to be detected, the technique of "rapidly changing the wavelength of the laser beam" is relatively important.

In view of the above, an object of the present invention is to provide a laser wavelength conversion structure and a laser wavelength control structure of an optical radar device and a method thereof, so that the optical radar device can quickly change its laser wavelength.

Therefore, the present invention provides a laser wavelength conversion element comprising a receiving member extending axially and having an accommodating space therein, the accommodating space is filled with wavelength-converting atoms or molecules, and the accommodating member has two ends. At least two optical lenses respectively disposed at two ends of the axial extension of the receiving member for the laser beam to pass through the laser wavelength conversion element.

The above wavelength converting atom or molecule is in the form of a gas or a liquid.

The gas system is selected from the group consisting of hydrogen, helium, neon, nitrogen, helium, argon, oxygen, carbon dioxide, methane, or a mixture of two or more thereof.

The above-mentioned accommodating member has a circular tubular shape.

The inside of the accommodating member is provided with an inner surface which is a total reflection surface.

The length of the above-mentioned receiving member is an even multiple of the focal length of the optical lens.

The invention also relates to a laser wavelength control structure of an optical radar device, comprising a transmitting module for emitting a laser beam to a space to be tested and forming a transmitting path; and an optical collecting unit receiving the same Measuring an optical signal of a spatial reflection; an analysis unit is connected to the optical collection unit to analyze the optical signal; and the main feature is that a first laser wavelength conversion component is disposed on the emission path, and at least one The second laser wavelength conversion element can be positioned on the emission path instead of the first laser wavelength conversion element, by converting different first laser wavelength conversion elements or second laser wavelength conversion elements on the emission path To control the wavelength of the laser beam.

The second wavelength conversion component is plural, and the first laser wavelength conversion component, the second laser wavelength conversion component, and the emission path are arranged in parallel with each other, the first laser wavelength conversion component and the second Any of the laser wavelength conversion elements can be positioned on the transmission path.

The second wavelength conversion element is plural, and the first laser wavelength conversion element and the second laser wavelength conversion elements are arranged in a ring along the emission path, the first laser wavelength conversion element and the second Any of the laser wavelength conversion elements can be positioned on the transmission path.

The above laser beam is used for detecting one or a mixture of two or more of sulfur dioxide, nitrogen oxides, and gas glue.

The above optical collection unit is a telescope.

An optical aperture, a lens, a filter module and a photomultiplier tube are sequentially connected between the optical collection unit and the analysis unit.

The above analysis unit includes an analog/digital converter and a computer.

The invention can also be a laser wavelength control method for an optical radar device, comprising the steps of: directing a laser beam of an optical radar detecting device to a target to be tested via a transmitting path; and setting a first on the transmitting path a wavelength conversion element that changes a wavelength of the laser beam through the first wavelength conversion element, and at least one second laser wavelength conversion element can be positioned on the emission path of the laser beam instead of the first laser wavelength conversion element; Different wavelength conversion elements are applied to the emission path of the laser beam to control the wavelength of the laser beam.

The second wavelength conversion element is plural, and the first laser wavelength conversion element, the second laser wavelength conversion elements, and the emission path are arranged in parallel with each other, the first laser wavelength conversion element and the second lightning Any of the wavelength converting elements can be positioned on the transmitting path.

The second wavelength conversion element is plural, and the first laser wavelength conversion element and the second laser wavelength conversion elements are arranged in a ring along the emission path, and the first laser wavelength conversion element and the first Any of the two laser wavelength conversion elements can be positioned on the transmission path.

The above laser beam is used for detecting one or a mixture of two or more of sulfur dioxide, nitrogen oxides, and gas glue.

The invention has the following advantages:

1. The laser wavelength conversion element of the present invention, the inside of which is filled with a wavelength-converting atom or molecule, and when the laser beam passes, the wavelength-converting atom or The molecules produce energy level transitions that change the wavelength of the laser beam.

2. The laser wavelength conversion element of the present invention, wherein the inner surface of the receiving member is a total reflection surface, thereby reducing the loss of laser power.

3. The laser wavelength control structure of the optical radar device of the present invention, comprising: the plurality of laser wavelength conversion elements and the emission paths of the laser beams are arranged in parallel with each other, thereby controlling the laser beam by transforming different laser wavelength conversion elements The wavelength.

4. The laser wavelength control structure of the optical radar device of the present invention, comprising a plurality of laser wavelength conversion elements arranged in a ring along a transmission path of the laser beam, thereby being controllable by different laser wavelength conversion elements The wavelength of the laser beam.

5. The laser wavelength control structure of the optical radar device of the present invention can perform qualitative analysis of gas glue by emitting laser beams of different wavelengths, and can be applied to pollutant detection, such as detection of pollutants in the air. , sea surface oil thickness and distribution measurement related to environmental protection testing, atmospheric structure or dynamic properties, special material exploration.

The laser wavelength conversion element of the present invention comprises a receiving member and at least two optical lenses; the receiving member has an extended length in the axial direction, and has an accommodating space therein, the accommodating space is filled with wavelength converting atoms or molecules, and the accommodating member The two optical lenses are respectively disposed at two ends of the accommodating member, and the accommodating member encloses the sealed accommodating space, and the optical lens is configured to pass the laser beam through the laser wavelength conversion element. When the laser beam passes through the accommodating member The lens of the end enters the laser wavelength conversion element, and the wavelength-converting atom or molecule in the laser wavelength conversion element absorbs the energy of the laser beam to perform atomic or molecular vibration, rotation or energy level transition, and is changed by the optical lens at one end of the receiving member. The laser wavelength is re-emitted with photons of another wavelength, and the emitted light beam exits the laser wavelength conversion element via the optical lens at the other end of the housing, and the laser beam exiting the laser wavelength conversion element and entering the lightning The laser beam that emits the wavelength conversion element has a different wavelength.

Please refer to the first figure, which is a cross-sectional view of an embodiment of the laser wavelength conversion element (1) of the present invention. In the figure, the laser wavelength conversion element (1) comprises a receiving member (11), a first optical lens (12) and a second optical lens (13); the receiving member (11) has an extended length in the axial direction and has an inner portion An accommodating space, an inner surface (15) is disposed inside the accommodating member (11), the inner surface (15) is a total reflection surface; and the first optical lens (12) is disposed at a front end of the accommodating member (11), The second optical lens (13) is disposed at the end of the accommodating member (11), and the first optical lens (12), the second optical lens (13) and the accommodating member (11) enclose a sealed accommodating space. Contains wavelength converting atoms or molecules (14). When the first laser beam (16) enters the laser wavelength conversion element (1) via the first optical lens (12) at the front end of the receiving member (11), the wavelength converting atom or molecule within the laser wavelength conversion element (1) 14) absorbing the energy of the first laser beam (16) for atomic or molecular vibration, rotation or energy level transitions, changing the wavelength of the laser entering by the first optical lens (12) and re-emitting it with photons of another wavelength, The emitted light beam exits the laser wavelength conversion element (1) via the second optical lens (13) at the end of the receiving member (11), at which point the laser wavelength conversion is left. The second laser beam (17) of element (1) has a different wavelength than the first laser beam (16).

Wherein, the wavelength converting atom or molecule (14) may be selected from the group consisting of hydrogen, helium, neon, nitrogen, helium, argon, oxygen, carbon dioxide, methane or a mixture of two or more thereof or a liquid such as an organic dye. Form implementation. The accommodating member (11) is preferably a circular tubular shape, and the inner surface (15) of the circular tubular accommodating member (11) can withstand the pressure of the internal filling material on average, and has better stability and safety than other shapes of the accommodating member. Moreover, the inner surface (15) of the accommodating member (11) is preferably made of a total reflection surface material, and the inner surface (15) of the total reflection surface material can reduce the laser power loss.

Wherein the length of the receiving member (11) is an even multiple of the focal length of the first optical lens (12) or the second optical lens (13), whereby the first laser beam (16) passes through the front end of the receiving member (11) After the first optical lens (12) and the inner surface (15) of the receiving member (11) are refracted, the second laser beam (17) can be separated in parallel via the second optical lens (13) at the end of the receiving member (11). Laser wavelength conversion element (1).

The laser wavelength conversion element of the present invention can replace the wavelength-converting atoms or molecules in the internal housing space of the receiving member (11) by filling the opening (18) without changing the first laser beam (16) (14). The wavelength of the second laser beam (17) is controlled by a different wavelength converting atom or molecule. In addition, without changing the first laser beam (16), a plurality of sets of laser wavelength conversion elements (1) are prepared in advance, so that the insides of the housings (11) of each of the laser wavelength conversion elements (1) are respectively filled. Different wavelengths convert atoms or molecules (14) by using thunder The laser wavelength conversion element (1) is replaced on the emission path of the beam to achieve the purpose of rapidly changing the wavelength of the laser beam.

The laser wavelength control structure of the optical radar device of the present invention comprises a transmitting module, an optical collecting unit and an analyzing unit, wherein the first laser wavelength converting element is disposed on a transmitting path of the laser beam, and at least a second The laser wavelength conversion element can be positioned on the emission path of the laser beam instead of the first laser wavelength conversion element, and the wavelength of the laser beam is controlled by transforming different laser wavelength conversion elements onto the emission path of the laser beam. The transmitting module is configured to emit the laser beam to the space to be tested, the optical collecting unit is configured to receive the optical signal reflected from the space to be tested, and the analyzing unit is connected to the optical collecting unit for analyzing the optical signal.

The laser beam is preferably used for detecting one or a mixture of two or more of sulfur dioxide, nitrogen oxides, and gas gel.

Please refer to the second figure, which is a schematic diagram of a first embodiment of a laser wavelength control structure of the optical radar device of the present invention. In the figure, the laser wavelength control structure of the optical radar device comprises a transmitting module (21), an optical collecting unit (22), a first wavelength converting component (23), a second wavelength converting component (24), and a third wavelength converting component. (25), a fourth wavelength conversion element (26), a slider (27), and a slide rail (29). Wherein, the optical collection unit (22) is a telescope, and the emission module (21) emits a laser beam along a transmission path (28), and the laser beam passes through a first wavelength conversion element located on the emission path (28) ( 23) changing the wavelength and transmitting to a space to be tested (A), the reflected optical signal is first collected by the optical collecting unit (22), and sequentially passed through an aperture (31), a lens (32), A filter module (33) filters out the desired optical signal, which is then amplified by a photomultiplier tube (34) and transmitted to an analog/digital converter (35) and computer (36) of an analysis unit. The analog/digital signal converter (35) converts the optical signal into a pulse signal of current, and then the computer (36) analyzes the converted current pulse signal to analyze the characteristic parameter of the gas; wherein the first wavelength conversion The element (23), the second wavelength conversion element (24), the third wavelength conversion element (25), and the fourth wavelength conversion element (26) are respectively filled with different wavelength conversion atoms or molecules, which are parallel to each other and have an axis The first wavelength conversion element (23), the second wavelength conversion element (24), the third wavelength conversion element (25), and the fourth wavelength conversion are parallel to the emission path (28) of the emission module (21) The component (26) is disposed on the sliding seat (27) (as shown in the third figure), and the sliding seat (27) is slidable on the sliding rail (29) to control the first wavelength conversion component ( 23), any of the second wavelength conversion element (24), the third wavelength conversion element (25) or the fourth wavelength conversion element (26) Which one moves to the transmission path (28), thereby transforming different laser wavelength conversion elements to change the wavelength of the control laser beam. In this embodiment, the wavelength of the laser beam is controlled by different wavelength-converting atoms or molecules to achieve qualitative analysis of the substance to be tested (A).

Please refer to the fourth figure, which is a schematic diagram of a second embodiment of the laser wavelength control structure of the optical radar device of the present invention. In the figure, the laser wavelength control structure of the optical radar device comprises a transmitting module (21A), an optical collecting unit (22A), a first wavelength converting element (23A), a second wavelength converting element (24A), and a third wavelength converting element. (25A), fourth wavelength conversion element (26A), turntable (27A) and drive unit (29A). The transmitting module (21A) emits a laser beam along the transmitting path (28A), and the laser beam is changed to a wavelength through the first wavelength converting element (23A) located on the transmitting path (28A), and then emitted to a space to be tested, the reflected light The signal is first collected by the optical collection unit (22A) and then filtered out the desired optical signal for analysis; wherein the first wavelength conversion element (23A), the second wavelength conversion element (24A), and the third wavelength conversion element (25A) The fourth wavelength conversion element (26A) is arranged in a ring shape parallel to the emission path (28A), and the rotation of the turntable (27A) is driven by the driving unit (29A) to make the first wavelength conversion element (23A) Any one of the second wavelength conversion element (24A), the third wavelength conversion element (25A), or the fourth wavelength conversion element (26A) may be positioned on the emission path (28A) by changing different lasers The wavelength conversion element controls the wavelength of the laser beam.

Please refer to the fifth figure, which is a block diagram of the laser wavelength control structure of the optical radar device of the present invention. In the figure, the transmitting module (41) emits a fixed-wavelength laser beam (51) to a laser wavelength converting component (42), and the fixed-wavelength laser beam (51) is wavelength-converted into a laser beam of a specific wavelength (52). And emitted from the laser wavelength conversion component (42) to the object to be tested (43), the object to be tested (43) reflects an optical signal (53) to the optical collection unit (44), and the optical collection unit (44) collects the optical signal ( 53) After filtering the useless noise by the filter module (45), since the signal strength may be insufficient and analogous, the signal is amplified by the photomultiplier tube (46), and the analog/digital signal converter is used. 47) Convert the signal into a digital signal, and finally analyze the object to be tested by the computer (48).

Please refer to the sixth figure, which is a laser of the optical radar device of the present invention. Flow chart of the wavelength control method. In the figure, the laser wavelength control method of the optical radar device comprises the following steps: Step 1: The laser beam of the optical radar detecting device is directed to the target to be tested via a transmitting path; Step 2: setting the first wavelength conversion on the transmitting path An element that causes the laser beam to change wavelength through the first wavelength conversion element, and at least one second laser wavelength conversion element can be positioned on the emission path of the laser beam instead of the first laser wavelength conversion element; Transforming different wavelength conversion components onto the emission path of the laser beam to control the wavelength of the laser beam.

Preferably, the second wavelength conversion element is plural, and the first laser wavelength conversion element, the plurality of second laser wavelength conversion elements, and the emission paths of the laser beams are arranged in parallel with each other, the first laser wavelength conversion element and the plurality Any of the second laser wavelength conversion elements can be positioned on the emission path of the laser beam.

Preferably, the second wavelength conversion component is a plurality, and the first laser wavelength conversion component and the plurality of second laser wavelength conversion components are arranged in a ring along the emission path of the laser beam, and the first laser wavelength conversion component and Any of the plurality of second laser wavelength conversion elements can be positioned on the emission path of the laser beam.

The laser beam is preferably used for detecting one or a mixture of two or more of sulfur dioxide, nitrogen oxides, and gas gel.

The above is intended to be illustrative only and not limiting. Any not detached The spirit and scope of the present invention, and equivalent modifications or variations thereof, are intended to be included in the scope of the appended claims.

(1) ‧‧‧Laser wavelength conversion components

(11)‧‧‧Accessories

(12)‧‧‧First optical lens

(13)‧‧‧Second optical lens

(14) ‧‧‧wavelength-converting atoms or molecules

(15) ‧‧‧ inner surface

(16)‧‧‧First laser beam

(17)‧‧‧second laser beam

(18)‧‧‧ Filling port

(21)‧‧‧Transmission module

(22)‧‧‧Optical collection unit

(23)‧‧‧First wavelength conversion element

(24) ‧‧‧second wavelength conversion element

(25)‧‧‧ Third wavelength conversion element

(26)‧‧‧Fourth wavelength conversion element

(27)‧‧‧Slide

(28)‧‧‧ Launch path

(29)‧‧‧Slide rails

(31) ‧ ‧ aperture

(32)‧‧‧ lens

(33)‧‧‧Filter Module

(34) ‧ ‧ Photomultiplier

(35)‧‧‧ Analog/Digital Signal Converters

(36)‧‧‧ Computer

(41)‧‧‧Transmission module

(42)‧‧‧Laser wavelength conversion components

(43) ‧‧‧Test objects

(44)‧‧‧Optical collection unit

(45)‧‧‧Filter Module

(46) ‧‧‧Photomultiplier

(47)‧‧‧ Analog/Digital Signal Converters

(48)‧‧‧ Computer

(51)‧‧‧ Fixed wavelength laser beam

(52)‧‧‧Special wavelength laser beam

(53)‧‧‧Optical signal

(21A)‧‧‧Transmission module

(22A) ‧‧‧Optical collection unit

(23A)‧‧‧First Wavelength Conversion Element

(24A) ‧‧‧second wavelength conversion element

(25A)‧‧‧ Third wavelength conversion element

(26A) ‧‧‧Fourth wavelength conversion element

(27A)‧‧‧ Turntable

(28A)‧‧‧ Launch path

(29A)‧‧‧ drive unit

(A) ‧ ‧ space to be tested

The first figure is a cross-sectional view of the laser wavelength conversion element of the present invention.

The second figure is a schematic view of a first embodiment of a laser wavelength control structure of the optical radar device of the present invention.

The third figure is a schematic view of the slide of the present invention sliding on the slide rail.

The fourth figure is a schematic view of a second embodiment of the laser wavelength control structure of the optical radar device of the present invention.

The fifth figure is a block diagram of the laser wavelength control structure of the optical radar device of the present invention.

The sixth figure is a flow chart of the laser wavelength control method of the optical radar device of the present invention.

(1) ‧‧‧Laser wavelength conversion components

(11)‧‧‧Accessories

(12)‧‧‧First optical lens

(13)‧‧‧Second optical lens

(14) ‧‧‧wavelength-converting atoms or molecules

(15) ‧‧‧ inner surface

(16)‧‧‧First laser beam

(17)‧‧‧second laser beam

(18)‧‧‧ Filling port

Claims (7)

A laser wavelength control structure for an optical radar device, comprising: a transmitting module for emitting a laser beam to a space to be tested and forming a transmitting path; and an optical collecting unit receiving the reflected from the space to be tested An optical signal; an analysis unit connected to the optical collection unit for analyzing the optical signal; wherein the first laser wavelength conversion component is disposed on the transmission path, and at least two of The second laser wavelength conversion component can be disposed on the emission path instead of the first laser wavelength conversion component, and the first wavelength conversion component and the second wavelength conversion component are both disposed on a sliding seat, and the sliding seat The first laser wavelength conversion component, the second laser wavelength conversion component, and the emission path are arranged in parallel with each other to make the first laser wavelength conversion component and the second Any one of the laser wavelength conversion elements can be positioned on the transmission path by converting a different first laser wavelength conversion element or a second laser wavelength conversion element to the emission path , To control the wavelength of the laser beam. The laser wavelength control structure of the optical radar device according to claim 1, wherein the laser beam is used for detecting one or a mixture of two or more of sulfur dioxide, nitrogen oxides, and gas gel. The laser wavelength control structure of the optical radar device of claim 1, wherein the optical collection unit is a telescope. The laser wavelength control structure of the optical radar device of claim 1, wherein the optical collection unit and the analysis unit are sequentially connected with an aperture, a lens, a filter module, and a photoelectric multiplication. tube. The laser wavelength control structure of the optical radar device of claim 1, wherein the analysis unit comprises an analog/digital signal converter and a computer. A laser wavelength control method for an optical radar device, comprising the steps of: directing a laser beam of an optical radar detecting device to a target to be tested via a transmitting path; and providing a first wavelength converting component on the transmitting path; The laser beam is changed in wavelength by the first wavelength conversion element, and at least two or more second laser wavelength conversion elements are disposed on the emission path of the laser beam instead of the first laser wavelength conversion element, the first wavelength The conversion element and the second wavelength conversion elements are all disposed on a sliding seat, the sliding seat is slidable on a sliding rail, and the first laser wavelength conversion component, the second laser wavelength conversion component, and The emission paths are arranged in parallel with each other such that any one of the first laser wavelength conversion element and the second laser wavelength conversion elements can be positioned on the emission path; by converting different wavelength conversion elements to the laser The wavelength of the laser beam is controlled by the beam's emission path. Laser of the optical radar device as described in claim 6 A wavelength control method, wherein the laser beam is used for detecting one or a mixture of two or more of sulfur dioxide, nitrogen oxides, and gas glue.