KR20160038968A - gas sensor asembly having optical cavity - Google Patents

gas sensor asembly having optical cavity Download PDF

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Publication number
KR20160038968A
KR20160038968A KR1020140131191A KR20140131191A KR20160038968A KR 20160038968 A KR20160038968 A KR 20160038968A KR 1020140131191 A KR1020140131191 A KR 1020140131191A KR 20140131191 A KR20140131191 A KR 20140131191A KR 20160038968 A KR20160038968 A KR 20160038968A
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KR
South Korea
Prior art keywords
light
parabolic
reflection surface
parabolic reflection
gas sensor
Prior art date
Application number
KR1020140131191A
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Korean (ko)
Inventor
허상휴
조경재
Original Assignee
포미주식회사
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Publication date
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Priority to KR1020140131191A priority Critical patent/KR20160038968A/en
Publication of KR20160038968A publication Critical patent/KR20160038968A/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/59—Transmissivity
    • G01N21/61—Non-dispersive gas analysers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
    • G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
    • G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
    • G01N33/004—CO or CO2
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G08B17/103—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G08B17/103—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device
    • G08B17/107—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device for detecting light-scattering due to smoke
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • G01N2021/0106—General arrangement of respective parts
    • G01N2021/015—Apparatus with interchangeable optical heads or interchangeable block of optics and detector

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  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Immunology (AREA)
  • General Health & Medical Sciences (AREA)
  • Biochemistry (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Optics & Photonics (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

The present invention relates to a gas sensor assembly having a broadness, and more particularly, to a gas sensor assembly having a broad base, which includes a base plate having a light wavelength capable of traveling light, a light source for emitting light through a light incidence aperture of the light wavelength, And a photodetector. The photocavity includes a first horizontal bottom surface extending in a horizontal direction and extending upward from the base plate, a first parabolic reflection surface extending upward from one end of the first horizontal bottom surface and having a first parabolic surface, A second parabolic reflection surface that extends upward from the other end of the first horizontal bottom surface and has a second parabolic curved surface at a distance from the first parabolic reflective surface toward the upward direction, And a light incident guide for guiding the optical path in a horizontal plane so that the light emitted from the light source can be incident on the first parabolic reflection surface, The first parabolic reflection surface has a first focal length, the second parabolic reflection surface has a second focal length shorter than the first focal length, and the first parabolic reflection surface has a second focal length, The parabolic reflection surface, the focus position, and the optical axis are formed on the base plate in the same manner. According to the gas sensor assembly having a broadness, it is possible to increase the sensitivity of the gas sensor assembly by allowing the light beam to be incident on the photodetector in such a manner that the light beam is concentrated while being reflected many times using two parabolic surfaces, .

Description

Technical Field [0001] The present invention relates to a gas sensor assembly having an optical cavity,

[0001] The present invention relates to a gas sensor assembly having a broadness, and more particularly, to a gas sensor assembly having a lightness that can be easily manufactured and increased in optical path length to improve gas detection performance.

In the case of fire, carbon monoxide, carbon dioxide and smoke are generated in the initial stage. Such sensors for detecting carbon monoxide, carbon dioxide, and smoke are variously known.

In the case of a contact-type sensor for detecting carbon monoxide by a reduction reaction, various publications such as Korean Patent Publication No. 1999-1000001 have been published.

However, such a contact type sensor has a disadvantage in that the reaction capability is deteriorated over time.

On the other hand, although it is possible to consider an optical system that detects a change in the amount of light emitted by a change in the concentration of gas, in the case of carbon monoxide, the light absorption rate is low and the optical path via the gas must be relatively long in order to induce a sufficient change in light quantity. There is a problem that when the optical path is made longer only in order to secure a long optical path, optical loss occurs and the size becomes large.

It is an object of the present invention to provide a gas sensor assembly having an optical path that can be sufficiently long and small in size, and which has a lightness that is easy to manufacture.

According to an aspect of the present invention, there is provided a gas sensor assembly including a base plate having a light-transmitting surface, A light source for emitting light through a light incidence aperture of the aperture of the base plate; And a photodetector for receiving the light incident through the light incidence hole and detecting light passing through the light incidence, wherein the light incidence includes a first horizontal bottom surface extending in the horizontal direction and being inserted into the base plate, A first parabolic reflection surface extending upward from one end of the bottom surface and formed to be drawn into the base plate to have a first parabolic surface and reflecting the incident light; a second parabolic surface extending upward from the other end of the first horizontal bottom surface, The second parabolic reflector has a second parabolic curved surface that is closer to the first parabolic reflective surface and extends to a position lower than the first parabolic reflective surface and is drawn into the base plate to reflect the incident light, The light emitted from the light source may be incident on the first parabolic reflection surface between the slope and the upper end of the first parabolic reflection surface and the upper end of the second parabolic reflection surface Wherein the first parabolic reflection surface and the second parabolic reflection surface are optical axes of the first parabolic reflection surface and the second parabolic reflection surface, Wherein the second parabolic reflection surface has a second focal length that is shorter than the first focal length and the first parabolic reflection surface is formed on the base plate with the same focus position and optical axis as the first parabolic reflection surface, The photodetector is installed to receive light traveling in a direction parallel to the first horizontal bottom surface by reflecting the first parabolic reflection surface and the second parabolic reflection surface many times.

The first and second parabolic reflection surfaces forming the light waveguide and the surface of the first horizontal bottom surface are coated with any one of gold, silver, copper and aluminum having high reflectance.

A collimating lens for converting the light emitted from the light source into parallel light and advancing the light to the light incidence guide; and a collimating lens for converting the light emitted from the light source into parallel light, .

And the balanced light incident through the light incident guide path is formed so as to be reflected by the first parabolic reflective surface and the second parabolic reflective surface at least three times and incident on the photodetector.

According to the gas sensor assembly of the present invention, when the light beam is concentrated while being reflected a plurality of times using two parabolic surfaces, the light beam can be incident on the photodetector in such a manner that the light beam is reduced in size, It provides an advantage that can be done.

FIG. 1 is a view showing a gas sensor assembly having a broadness according to the present invention,
FIG. 2 is a cross-sectional view illustrating an assembled state of the gas sensor assembly having the lightness shown in FIG. 1,
3 is a diagram schematically illustrating the optical path of the gas sensor assembly of FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a gas sensor assembly according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a view showing a gas sensor assembly having a lightness according to the present invention, FIG. 2 is a sectional view showing an example of a gas sensor assembly having a lightness shown in FIG. 1 assembled, 1 schematically illustrates the optical path of the gas sensor assembly.

1 to 3, a gas sensor assembly 100 according to the present invention includes a case 110, a base plate 130 mounted within the case, a light source 151, a collimating lens 153 A photodetector 155, a measuring unit 160, and an output unit 170. [

The lower case 112 and the upper case 114 are coupled to each other by a screw connection in the illustrated example, and the case 110 is provided with a housing space in which elements for detecting gas can be housed. And a storage space can be formed in a coupled state.

The lower case 112 is formed with an opening 113 through which an object gas can be input and output.

Reference numeral 117 denotes a circuit board on which a light source 151 and a light detecting unit 155, a measuring unit 160, and an output unit 170 to be described later are mounted.

The base plate 130 is provided on the base plate 130 so that the exposed surface of the optical cavity 140, that is, the surface 131 of the base plate 130 can be exposed to the opening 113 so that the gas to be measured can be introduced into the optical cavity 140 It is mounted on the bottom.

The base plate 130 is configured such that the light emitted from the light source 151 is reflected many times and incident on the photodetector 155.

The base plate 130 is formed with a light cavity 140 to expose a portion opposed to the opening 113 and enter the inside of the base plate 130 so that light can proceed.

The light guide 140 has a structure including a first horizontal bottom surface 141, a first parabolic reflection surface 142, a second parabolic reflection surface 143 and a light incidence guide path 144 .

The first horizontal floor surface 141 is a portion extending from the surface 131 of the base plate 130 and extending in a constant length in a horizontal direction at a constant width.

The first parabolic reflection surface 142 extends upward from one end of the first horizontal bottom surface 141 and is formed to be drawn from the surface of the base plate 130 with a first parabolic surface to reflect the incident light.

The first parabolic reflection surface 142 is located above the region forming the light exit port 147 to provide a light path for light to the photodetector 155, which will be described later, at a position spaced from one end of the first horizontal bottom surface 141 As shown in Fig.

The second parabolic reflection surface 143 extends upward from the other end of the first horizontal bottom surface 141 and has a second parabolic curved surface at a distance from the first parabial reflective surface 142 as it goes upward The upper end 143a extends to a lower position than the upper end 142a of the first parabolic reflective surface 142 and is drawn into the base plate 130 to reflect the incident light .

The light incidence guide path 144 is provided between the upper end 142a of the first parabial reflection surface 142 and the upper end of the second parabolic reflection surface 142a so that the light emitted from the light source 151 passes through the first parabolic reflection surface 142 So as to guide the optical path along a direction parallel to the first horizontal floor surface 141. The first horizontal floor surface 141 is formed in a substantially rectangular shape.

One side of the light incidence guide path 144 serves as a light incidence aperture.

In this structure, the first horizontal bottom surface 141 becomes the optical axis of the first parabolic reflection surface 142 and the second parabolic reflection surface 143, and the first parabolic reflection surface 142 is the optical axis of the first parabolic reflection surface 142, The second parabolic reflection surface 142 has a second focal length p2 shorter than the first focal distance p1 and the first parabolic reflection surface 142 and the focus position f and the optical axis are the same As shown in FIG.

That is, the two parabolic surfaces having mutually different focal lengths are cut with respect to the optical axis, and the cut upper surfaces are formed in the same shape as the concave surfaces facing each other and arranged at the same focal position f.

3, the parallel beam incident from the light source 151 through the light incidence guide path 144 is reflected by the first parabolic reflection surface 142 to the focus position f, Reflected again toward the second parabolic reflection surface 143, and subsequently incident on the first parabolic reflection surface 142 in the horizontal direction. In this process, the light beam is condensed so that the cross-sectional width of the light beam progressively decreases as the light advances, and the light beam reflected by the second parabolic reflection surface 143 and progressing in the vertical direction is reflected by the first horizontal floor surface 141 ) Are close to each other.

The balanced light incident through the light incidence guide path 144 is reflected by the first parabolic reflection surface 142 and the second parabolic reflection surface 143 at least three times, more preferably three to five times, It is preferable to be formed so as to be incident on the detector 155.

And is outputted through the light output port 147 opened to the region where the photodetector 155 is installed through the light progressing process.

The first and second parabolic reflection surfaces 142 and 143 and the surface of the first horizontal bottom surface 141 that form the optical waveguide 140 may be formed of any one of gold, silver, As shown in FIG.

The light source 151 emits light through the light incidence aperture 145 of the aperture 140 of the base plate 130.

It is preferable that a collimating lens 153 for converting the light emitted from the light source 151 into parallel light and advancing the light to the light incidence guide 144 when the light emitted from the light source 151 is diffused is provided.

The photodetector 155 is installed to detect light passing through the light incident portion 145 and passing through the light incident portion 140.

That is, the photodetector 155 reflects the first parabolic reflection surface 142 and the second parabolic reflection surface 143 a plurality of times and advances in a direction parallel to the first horizontal bottom surface 141, The light output port 147 of the base plate 130 can receive the light output through the light output port 147. [

The measurement unit 160 controls the driving of the light source 151 and detects the concentration of carbon monoxide CO in the optical characteristic 140 from an electrical signal corresponding to the amount of light received from the optical detector 155.

In the measurement unit 160, a value obtained by previously experimentally measuring the concentration value of carbon monoxide corresponding to the amount of light detected by the photodetector 155 is recorded in a lookup table (not shown). The concentration of carbon monoxide . ≪ / RTI >

The measurement unit 160 transmits a detection value or an alarm alarm through the output unit 170 when carbon monoxide having a predetermined concentration or more is detected.

Here, it goes without saying that the output unit 170 may be a communication unit that transmits information to a display unit or a management device that displays information by wire or wireless.

As described above, according to the present gas sensor assembly 100, when light beams are concentrated while being reflected a plurality of times using two parabolic surfaces, the small width can be incident on the photodetector so that sensitivity can be increased. It offers the advantage of being scalable.

110: Case 130: Base plate
151: Light source 153: Collimating lens
155: photodetector 160:
170:

Claims (5)

A base plate having a light transmittable light intensity;
A light source for emitting light through a light incidence aperture of the aperture of the base plate;
And a photodetector for receiving the light incident through the light incidence and detecting the light transmitted through the light incidence,
The base plate may include a first horizontal bottom surface extending in the horizontal direction and extending upward from one end of the first horizontal bottom surface, and a first parabolic surface extending in the base plate, And a second parabolic curved surface extending upward from the other end of the first horizontal bottom surface and spaced apart from the first parabolic reflective surface in an upward direction, A second parabolic reflection surface extending to a lower position than the parabolic reflection surface and formed to be drawn into the base plate to reflect the incident light; and a second parabolic reflection surface extending between the upper end of the first parabolic reflection surface and the upper end of the second parabolic reflection surface, And a light incident guide path for guiding the optical path in a horizontal plane so that light emitted from the first parabolic reflection surface can be incident on the first parabolic reflection surface
The first parabolic reflection surface and the second parabolic reflection surface are the optical axis of the first parabolic reflective surface and the second parabolic reflective surface, and the first parabolic reflective surface has a first focal length, The first parabolic reflection surface having a second focal length shorter than one focal length, the focus position and the optical axis being formed on the base plate in the same manner,
Wherein the photodetector is installed to receive light traveling in a direction parallel to the first horizontal bottom surface by reflecting the first parabolic reflective surface and the second parabolic reflective surface a plurality of times, Sensor assembly. The method according to claim 1, wherein the first and second parabolic reflection surfaces forming the light waveguide and the surface of the first horizontal bottom surface are coated with any one of gold, silver, copper, The gas sensor assembly comprising: The gas sensor assembly according to claim 2, further comprising: a measuring unit for detecting a concentration of carbon monoxide in the optical spectrum from a light amount signal output from the photodetector. The gas sensor assembly according to claim 3, further comprising a collimating lens for converting light emitted from the light source into parallel light and advancing the parallel light to the light incidence guide. 2. The parabolic reflector according to claim 1, wherein the balanced light incident through the light incident guide path is formed so as to be incident on the photodetector by reflecting at least three times with respect to the first parabolic reflection surface and the second parabolic reflection surface Wherein the gas sensor assembly comprises a gas sensor assembly.
KR1020140131191A 2014-09-30 2014-09-30 gas sensor asembly having optical cavity KR20160038968A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115240358A (en) * 2022-05-25 2022-10-25 中国船舶重工集团公司第七0三研究所 A formula of breathing in smoke is felt and is surveyed structure for smog concentration detection

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115240358A (en) * 2022-05-25 2022-10-25 中国船舶重工集团公司第七0三研究所 A formula of breathing in smoke is felt and is surveyed structure for smog concentration detection

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