KR20180072585A - Transmitting and receiving system for optical remote measurement device - Google Patents

Abstract

The present invention relates to a transmission / reception system of an optical telemeter for measuring the concentration of an atmospheric substance in a distance, and more particularly, to a system for avoiding the complexity of a diffraction grating and an etalon optical system for narrowband spectroscopy in an existing DIAL system, By simplifying the system and enabling selective simultaneous-sequential use of the pigments used in the transmitting laser, it is possible to simultaneously measure the ozone, sulfur dioxide, nitrogen dioxide Receiving system of an optical telemeter for measuring a concentration.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical telemetry system,

The present invention relates to a transmission / reception system of an optical telemeter measuring the concentration of an atmospheric substance in a distance, and more particularly, to avoid the complexity of a diffraction grating and an etalon optical system for narrowband spectroscopy in a conventional DIAL optical telemetry system Simultaneous sequential measurement of ozone, sulfur dioxide and nitrogen dioxide present in the atmosphere as a system is possible by simplifying the entire transmission and reception system and enabling selective simultaneous and sequential use of pigments (Dye) And more particularly, to a transmission / reception system of an optical telemeter for measuring the concentration of each of these atmospheric substances by distance.

The optical telemetry used in the measurement of atmospheric materials is called Light Detection and Ranging. It is divided into non-scattering, fluorescence, Raman, Doppler and differential absorption (DIAL) according to the interaction of laser light and reactant.

The principle of measuring ozone, sulfur dioxide and nitrogen dioxide present in the double atmosphere is to irradiate ozone, sulfur dioxide and nitrogen dioxide at the same time by irradiating the laser wavelength (one wavelength) and the less absorption laser wavelength (off wavelength) It is a differential absorption method (DIAL: DIfferential Absorption Lidar) that measures the concentration of each wavelength by measuring the signals of the front and back wavelengths after the reaction with the nitrogen dioxide and collecting them using a spectroscopic optical system.

These optical systems require a laser transmitter with a narrow line width in the UV wavelength range to simultaneously transmit a laser wavelength (one wavelength) and a low absorption wavelength (off wavelength) to ozone, sulfur dioxide and nitrogen dioxide A receiver capable of collecting light of a backscattered wavelength, narrow-band spectroscopy, and weak light, and a signal processor and a data processor. At this time, the concentration per distance is calculated as the ratio of the back scattered on and off wavelengths.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to simplify the entire transmission and reception system by avoiding the complexity of diffraction gratings and etalon optics for narrowband spectroscopy in conventional DIAL systems, The present invention provides a system for transmitting and receiving an optical telemetry instrument that measures the concentration of atmospheric matter in a distance by simultaneous-successive measurement of ozone, sulfur dioxide, and nitrogen dioxide present in the atmosphere as a single system.

According to an aspect of the present invention, there is provided an optical telemetry transmitter and receiver system for measuring a concentration of an atmospheric substance in a distance, the system comprising: Laser pumping device; A two-wavelength resonant dye laser device designed to be a two-wavelength resonator type and oscillating a dye laser pumped through the dye laser pumping device simultaneously or sequentially with a laser beam; A laser beam magnifier for magnifying a laser beam oscillated through the two-wavelength resonant dye laser device; A reflector for adjusting and reflecting the optical axis of the enlarged laser beam; A scanning telescope for irradiating the laser beam reflected through the reflector to the atmosphere and receiving backscattered light of the laser of the atmospheric ozone, sulfur dioxide, nitrogen dioxide absorbed and non-absorbed laser wavelength; A telescope for focusing backscattered light received through the scanning telescope; A spectroscope for separating and filtering the light focused through the telescope to the same wavelength as the wavelength transmitted from the two-wavelength resonant dye laser device; A photomultiplier tube for detecting light of a wavelength filtered through the spectroscope; And a distance-specific concentration value calculation unit for calculating a concentration value of the atmospheric substance by distance from the light detected through the photo-multiplication pipe.

Here, the distance-based concentration value calculation unit may include an optical counter and an amplifier, and the two-wavelength resonance dye laser device may include an oscillator.

It is preferable that the oscillator and the amplifier oscillate and amplify the rotatable dye cell, respectively.

In addition, the spectroscope is preferably two wavelengths and two channels.

In addition, the two-wavelength resonant dye laser device preferably includes a beam collimator, a diffraction grating, a reflector, a motor, a chopper, a rotating disk, and a photocoupler for two-wavelength sequential oscillation.

The two-wavelength two-channel spectrometer is preferably arranged by arranging a field of view adjustment disc, a neutral density, a lens, a narrow band filter, a reflector, and a beam splitter.

Further, it is preferable that the dye laser pumping apparatus uses a xenon monochloride laser (XeCl).

It is preferable that the reflector uses an optical axis adjusting reflector.

The scanning telescope is preferably a rotary scanning telescope.

In addition, the telescope is a Newtonian telescope, and it is preferably composed of a main reflector, a sub-reflector, and an optical axis adjusting reflector.

Also, it is preferable that the spectroscope uses a two-channel narrow-band spectroscope.

In addition, it is preferable that the two-wavelength resonance dye laser device oscillates sequentially by using a mechanical chopper without simultaneously oscillating the laser of the absorption wavelength and the laser of the non-absorption wavelength.

In addition, it is preferable to use a rotating disk and a photocoupler to control the wavelength selection recognition and the laser repetition rate.

In addition, in the two-wavelength resonant dye laser device, the selection of the dye laser is determined by the rotatable dye cell, and each dye cell can be mounted up to three in one rotatable dye cell holder.

In the case of simultaneous measurement, it is preferable that each dye cell is rotated at a high speed in accordance with the frequency of the transmitted laser, and in the case of sequential measurement, the dye cell performs stop and rotation in accordance with the order and time of the sequential measurement .

As described above, according to the transmission / reception system of the optical telemeter for measuring the concentration of the atmospheric substance in the distance according to the embodiment of the present invention, the transmitter is a two-wavelength resonator type dye laser, Since it has the characteristic of transmitting two wavelengths sequentially, it is possible to reduce the optical complexity of existing DIAL optical telemetry system, which requires simultaneous measurement of short linewidths, and to enable automatic rotation and selection of pigments. As a single system, ozone, sulfur dioxide, It is possible to perform simultaneous-sequential continuous observations for the same time.

1 is a schematic block diagram of a transmitting / receiving system of an optical telemeter for measuring a concentration of an atmospheric substance in a distance according to an embodiment of the present invention.
2 is a schematic block diagram of a transmitting / receiving system of an optical telemeter measuring a concentration of an atmospheric substance according to distance according to another embodiment of the present invention.

The present invention may be embodied in many other forms without departing from its spirit or essential characteristics. Accordingly, the embodiments of the present invention are to be considered in all respects as merely illustrative and not restrictive.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms.

The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, .

On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, the terms "comprises", "having", "having", and the like are intended to specify the presence of stated features, integers, steps, operations, components, Steps, operations, elements, components, or combinations of elements, numbers, steps, operations, components, parts, or combinations thereof.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, in order that the present invention may be easily understood by those skilled in the art. .

1 is a schematic block diagram of a transmitting / receiving system of an optical telemeter for measuring a concentration of an atmospheric substance in a distance according to an embodiment of the present invention.

As shown in the figure, the transmission / reception system 100 of the optical telemeter for measuring the concentration of the atmospheric matter in the distance according to the embodiment of the present invention is a transmission / reception system of the optical telemeter measuring the concentration of the atmospheric material by distance, A dye laser pumping device (1) for pumping a dye laser; A two-wavelength resonant dye laser device (2) designed to be a two-wavelength resonator type dye laser and to be simultaneously or sequentially oscillated; A laser beam magnifier (3) for magnifying the oscillated laser beam; A reflector (4) for adjusting and reflecting the optical axis of the enlarged laser beam; A scanning telescope for receiving the reflected laser beam into the atmosphere and receiving backscattered light of a laser of a laser wavelength (on wavelength) absorbed by ozone, sulfur dioxide, nitrogen dioxide in the atmosphere and a laser of a non-absorbed laser wavelength (off wavelength) 7); A telescope 5 for focusing the received backscattering light; A spectroscope (6) for separating and filtering the focused light to the same wavelength as the wavelength transmitted from the two-wavelength resonance dye laser device; A photomultiplier tube for detecting light of the filtered wavelengths; And a distance-specific concentration value calculation unit 8 for calculating a concentration value for each distance of the atmospheric substance from the light detected through the photomultiplier tube.

The transmission / reception system 100 of the optical telemeter for measuring the concentration of the atmospheric substance according to the distance according to the embodiment of the present invention can measure the complexity of the diffraction grating and the etalon optical system for narrowband spectroscopy in the DIAL system And the simultaneous or sequential use of pigments used in transmission lasers makes possible the simultaneous and continuous measurement of ozone, sulfur dioxide and nitrogen dioxide present in the atmosphere as one system It is possible to measure the concentration by distance of

The dye laser pumping apparatus 1 is preferably a xenon monochloride laser (XeCl) for performing a function of pumping a dye laser.

The two-wavelength resonant dye laser device 2 is designed as a two-wavelength resonator type and performs a function of simultaneously or sequentially oscillating a dye laser pumped through the dye laser pumping device into a laser beam.

The two-wavelength resonance dye laser device 2 preferably includes an oscillator 15-1 (see FIG. 2) for oscillation to oscillate the rotatable dye cell.

The laser beam magnifier 3 serves to magnify the laser beam oscillated through the oscillator.

The reflector 4 adjusts and reflects the optical axis of the laser beam expanded through the laser beam magnifier 3.

At this time, the reflector 4 preferably uses an optical axis adjusting reflector.

The scanning telescope 7 irradiates the laser beam reflected through the reflecting mirror 4 to the atmosphere and irradiates a laser beam (on wavelength) absorbed in the atmospheric ozone, sulfur dioxide, nitrogen dioxide and a non- off wavelength) of the laser beam.

At this time, the scanning telescope 7 preferably uses a rotating scanning telescope.

The telescope 5 serves to collect the backscattered light received through the scanning telescope 7.

At this time, the telescope 5 is preferably a Newtonian telescope, and may be composed of a main reflector, a sub-reflector, and an optical axis adjusting reflector.

The spectroscope 6 serves as a spectroscope for separating and filtering the light focused through the telescope 5 to the same wavelength as the wavelength transmitted from the two-wavelength resonance dye laser device 2.

At this time, it is preferable to use a two-channel narrow-band spectroscope as the spectroscope 6 that performs a spectroscopic function, and a field-of-view adjustment disk. A neutral filter, a lens, a narrow-band filter, a beam splitter, a reflector, and the like.

Meanwhile, the photomultiplier tube (not numbered) serves to detect light of a wavelength filtered through the spectroscope 6.

The distance-based concentration value calculation unit 8 calculates a concentration value for each distance of the atmospheric substance from the light detected through the photomultiplier tube.

The distance-based concentration value calculation unit 8 is composed of an optical counter and an amplifier, and can count and amplify the detection light, thereby accurately calculating the concentration value of the atmospheric substance by distance.

The two-wavelength resonator dye laser device 2, which is a transmitter of the optical telemeter transmitter / receiver system 100, uses a two-wavelength resonator dye laser. Ozone, sulfur dioxide and nitrogen dioxide, And the wavelength of the non-absorbing wavelength (off wavelength) is very small, which is less than nm. Therefore, a highly sophisticated optical system is required for spectroscopically measuring the scattered signal in the atmosphere 6.

That is, in using a conventional narrow-band filter, it is necessary to adjust a very precise optical system. When a diffraction grating or an etalon is used, there is a disadvantage that a loss of a received signal is large and a measurement distance becomes short.

In order to avoid such disadvantages and to simplify the optical system, a two - wavelength resonator type dye laser was developed and constructed.

That is, the two-wavelength resonator type dye laser device of the optical remote measurement transmitter system for measuring the concentration of the atmospheric material according to the distance according to another embodiment of the present invention is characterized by using a mechanical chopper 20 (see FIG. 2) And has a characteristic structure that oscillates sequentially without oscillating the laser and the laser having the non-absorption wavelength simultaneously.

2 is a schematic block diagram of a transmitting / receiving system of an optical telemeter measuring a concentration of an atmospheric substance according to distance according to another embodiment of the present invention.

2, the overall configuration of an optical telemeter transmission / reception system 200 for measuring the concentration of atmospheric matter by distance in accordance with another embodiment of the present invention includes a xenon monochloride laser 11, The laser beam is focused by the splitters 12 and 13, the lens 14, the rotating dye cell 15-1, the rotating dye cell 15-2, the beam collimator 16, the diffraction grating 17, And is composed of a reflector 18, a motor 19, a chopper 20, a rotating disk 21, photocouplers 22 and 23, a BBO crystal 24, and a beam expander 25.

Herein, the transmitting / receiving system 200 of the optical telemeter for measuring the concentration of the atmospheric matter according to the distance according to another embodiment of the present invention is characterized in that the wavelength selection is performed by using the rotating disk 21 and the photocouplers 22 and 23 Recognition and laser repetition rate.

First, with respect to the transmission laser, the light pumped by the Xenon monochloride laser (XeCl) 11 is split by the beam splitter 12, 13 at a ratio of 50% to 50% of the output energy, And is oscillated by a dye laser oscillator 15-1 and an amplifier 15-2 composed of dye cells. A two-wavelength laser which is designed in a two-wavelength resonator type in a dye laser and sequentially oscillated is fed to a diffraction grating 17 And the beam is irradiated to the atmosphere through a beam magnifier 3, an optical axis adjusting reflecting mirror 4 and a rotating reflecting mirror 7 for reducing the divergence angle of the beam, as shown in Fig.

At this time, the pigment of the dye laser is sequentially selected depending on the substance to be measured. Rhodamine 6G (Rh-6G) is used to measure ozone wavelengths of 292.5 nm (on wavelength) and 294.5 nm (off wavelength), 300.05 nm (on wavelength) and 299 nm (off wavelength) And the Coomarin-450 (Co-450) pigment oscillates at 448 nm (one wavelength) and 449.8 nm (off wavelength). The choice of dye is determined by the motor rotating dye cell, and each dye cell can be mounted up to three in one rotatable dye cell holder. In the case of simultaneous measurement, each dye cell rotates at high speed according to the frequency of the transmission laser, and in the case of sequential measurement, the dye cell performs stop and rotation according to the order and time of the sequential measurement.

The backscattered light of the laser of wavelength (on wavelength) absorbed in ozone, sulfur dioxide, nitrogen dioxide in the atmosphere and the laser of non-absorbed laser wavelength (off wavelength) is then focused by the telescope 5 (see FIG. 1) (Not shown) after being filtered at the same wavelength as that transmitted by the spectroscope 6 (see Fig. 1) using two channels.

The receiving telescope 5 (see FIG. 1) is a Newtonian telescope as described above, which is composed of a main reflector, a sub-reflector and an optical axis adjusting reflector, and the spectroscope 6 is a field of view adjusting disk. Neutral Density, Lens, Narrow band filter, Beam splitter, Reflector.

The concentration value for each distance is calculated by the distance-based concentration value calculation unit 8, which is a signal processing and data processing apparatus composed of an optical counter and an amplifier.

Of course, in this embodiment, a two-wavelength resonator dye laser is used as a transmitter, and a Newtonian telescope and a two-channel narrow-band spectrometer are used as a receiver.

The present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

100, 200: Transmitter / receiver system of optical telemeter
1: Xenon monochloride laser 2: dye laser
3: beam magnifier 4: reflector for optical axis adjustment
5: Telescope
6: spectroscope
7 scanning telescope 8: signal processing and data processing unit
11: Xenon monochloride laser 12, 13: Beam splitting
14: lens 15-1: rotatable dye cell (oscillator)
15-2: rotatable dye cell (amplifier) 16: beam collimator
17: diffraction grating 18: reflector
19: motor 20: chopper
21: rotating disk 22, 23: photo coupler
24: BBO crystal 25: beam expander

Claims (15)

An optical remote meter transmitter / receiver system for measuring the concentration of an atmospheric substance in a distance,
A dye laser pumping device for pumping a dye laser;
A two-wavelength resonant dye laser device designed to be a two-wavelength resonator type and oscillating a dye laser pumped through the dye laser pumping device simultaneously or sequentially with a laser beam;
A laser beam magnifier for magnifying a laser beam oscillated through the two-wavelength resonant dye laser device;
A reflector for adjusting and reflecting the optical axis of the enlarged laser beam;
A scanning telescope for irradiating the laser beam reflected through the reflector to the atmosphere and receiving backscattered light of the laser of the atmospheric ozone, sulfur dioxide, nitrogen dioxide absorbed and non-absorbed laser wavelength;
A telescope for focusing backscattered light received through the scanning telescope;
A spectroscope for separating and filtering the light focused through the telescope to the same wavelength as the wavelength transmitted from the two-wavelength resonant dye laser device;
A photomultiplier tube for detecting light of a wavelength filtered through the spectroscope; And
And a distance-based concentration value calculation unit for calculating a concentration value for each distance of the atmospheric substance from the light detected through the photomultiplier tube.
The method according to claim 1,
Wherein the distance-based concentration value calculation unit includes an optical counter and an amplifier, and the two-wavelength resonance dye laser unit includes an oscillator.
3. The method of claim 2,
Wherein the oscillator and the amplifier oscillate and amplify the rotatable dye cell, respectively.
The method according to claim 1,
Wherein the spectroscope has two wavelengths and two channels.
The method according to claim 1,
Wherein the two-wavelength resonant dye laser device comprises a beam collimator for two-wavelength sequential oscillation, a diffraction grating, a reflector, a motor, a chopper, a rotating disk, and a photocoupler. Transmitter / receiver system of a remote instrument.
5. The method of claim 4,
Characterized in that the two-wavelength two-channel spectrometer is made up of an arrangement of a field of view adjustment disc, a neutral density, a lens, a narrow-band filter, a reflector and a beam splitter Transmitter / receiver system of optical telemeter measuring concentration.
The method according to claim 1,
Wherein the dye laser pumping apparatus uses a xenon monochloride laser (XeCl).
The method according to claim 1,
Wherein the reflector uses an optical axis adjusting reflector. 2. The optical telemetry transmitter / receiver system according to claim 1, wherein the reflector is an optical axis adjusting reflector.
The method according to claim 1,
Wherein the scanning telescope is a rotary scanning telescope. 2. The optical telemetry transmitter / receiver system according to claim 1,
The method according to claim 1,
Wherein the telescope is a Newtonian telescope and comprises a main reflector, a sub-reflector, and an optical axis adjusting reflector.
The method according to claim 1,
Wherein the spectroscope uses a two-channel narrow-band spectrometer.
The method according to claim 1,
Wherein the two-wavelength resonant dye laser device oscillates sequentially by using a mechanical chopper without simultaneously oscillating a laser having an absorption wavelength and a laser having a non-absorption wavelength. The optical remote meter Transmission / reception system.
The method according to claim 1,
Wherein the wavelength selective recognition and the laser repetition rate are controlled using a rotating disk and a photocoupler.
The method according to claim 1,
Wherein in the two-wavelength resonant dye laser device, the selection of the dye laser is determined by a rotatable dye cell, and each dye cell is mounted up to three in one rotatable dye cell holder. Transmitter / receiver system of optical telemeter measuring the concentration of stars.
15. The method of claim 14,
In the case of simultaneous measurement, each dye cell is rotated at a high speed in accordance with the frequency of the laser to be transmitted, and in the case of sequential measurement, the dye cell performs stop and rotation in accordance with the order and time of the sequential measurement An optical telemetry transceiver system for measuring the concentration of atmospheric matter by distance.

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