KR100898366B1 - Infrared gas detector having a pyrex mirror - Google Patents

Abstract

The present invention relates to an infrared gas detection device for transmitting the infrared rays through the measurement gas to detect the components and concentration of the measurement gas, consisting of four panels having a hollow portion, the opposite panel has an infrared incident hole and an infrared emission hole And a reflector for reflecting infrared rays at right angles, respectively, in the inner positions of the infrared incidence hole and the infrared emission hole, respectively; and a square column type absorption cell having openings at both ends thereof; A holder for closing both ends of the absorbent cell, and a reflective curved surface formed of the same material as the material of the holder and reflecting the infrared rays on the holder are formed toward the inside of the hollow portion, and the holder and the reflective curved surface are integrated. Including a reflective mirror formed by the gas component can be measured in a high temperature state.

As described above, the infrared gas detection apparatus according to the present invention can minimize the disturbance of the infrared beam alignment due to the difference in thermal expansion coefficient generated by the material difference between the holder and the reflective curved surface, and can be operated at a high temperature of 100 ° C. or higher. And it is possible to measure by vaporizing a gas containing water.

Measuring Gas, Infrared, Detector, Pyrex, Reflecting Mirror

Description

Infrared gas detector having a pyrex mirror

1 is a block diagram showing the configuration of a conventional gas detection apparatus.

Figure 2 is an exploded perspective view showing a state in which the absorption cell and the reflecting mirror partially disassembled in accordance with the present invention,

3 is a schematic diagram illustrating a path in which infrared rays incident into the absorption cell according to the present invention are reflected by the reflection mirror and are emitted.

※ Explanation of codes for main parts of drawing

100: absorption cell 110: top panel

111: gas hole 120: lower panel

130: left panel 140: right panel

131: infrared ray incident hole 141: infrared ray emitting hole

132 and 142: guide jaw 150: opening

160 (a, b): Reflector 200 (a, b): Reflector

210: holder 220: reflective surface

The present invention relates to an infrared gas detection device for transmitting the infrared rays through the measurement gas to detect the components and concentration of the measurement gas, and more particularly, an absorption cell having openings formed at both ends, a holder and infrared rays installed at the openings. Since the reflective curved surface reflecting the reflection mirror formed of an integral high-temperature tempered glass, the present invention relates to an infrared gas detection apparatus capable of operating at a high temperature to measure a measurement gas containing moisture.

In general, when a molecule is irradiated with infrared rays, the molecule is excited by the propagation of an intrinsic wavelength band corresponding to its inherent vibration and rotation spectrum, causing absorption of a corresponding spectral line. Infrared analysis is a method of measuring the concentration of a gas by transmitting infrared rays through a gas having an infrared absorption band and detecting the infrared absorption energy inherent in the molecule. At this time, the range of the wavelength normally used is 1-12 micrometers area. The degree of infrared absorption at each gas concentration satisfies Lambert-Beer's law and is determined by the product of the concentration and the infrared transmission distance and its gas-specific absorption coefficient and is exponential for infrared absorption energy. To change.

Since the infrared absorption is proportional to the length of the absorption cell and the gas concentration, the absorption coefficient is large enough and the monochromatic light is passed through the measuring gas to measure the intensity of the transmitted light. have.

1 is a block diagram showing the configuration of a conventional gas detection apparatus using the infrared absorption method.

As shown in the figure, a conventional infrared gas detection device includes a light source 10 for outputting infrared (IR), and a filter unit for receiving the infrared (IR) output from the light source 10 to filter a band of a specific wavelength 20, an absorption cell 30 to which the filtered infrared ray is incident and a measurement gas (Gas) is introduced to generate a mutual absorption reaction therein, and an infrared ray (IR) emitted from the absorption cell 30 And a detector 40 for detecting the absorption wavelength spectrum.

Among these, a pair of reflection mirrors (not shown) are provided inside the absorption cell 30 to reflect the infrared rays IR. Specifically, the reflective mirror is made of a common glass, and is bonded to a holder (not shown) installed inside the absorption cell 30. In general, the holder is manufactured using an aluminum alloy. The reflection mirror repeatedly reflects infrared rays (IR) incident into the absorption cell 30 to the inside of the absorption cell 30 so that the measurement gas introduced into the absorption cell 30 can be more easily absorbed. It has a role of increasing the total length of the optical path in the absorption cell by having multiple optical paths. Such a reflection mirror is a part that requires very precise processing because the infrared (IR) incident inside the absorption cell 30 must be accurately and repeatedly reflected by the reflection curvature and emitted to the outside.

As described above, the infrared gas detection device is generally installed in a place where a large amount of gas containing pollutants, such as incinerators or chimneys are discharged, is widely used.

However, in the conventional infrared gas detection apparatus, since the holder and the reflecting mirror are made of different materials, when the internal temperature of the absorption cell is raised to a high temperature as described above, the infrared ray is detected by the difference in the coefficient of thermal expansion according to the material of the holder and the reflecting mirror. There was a problem in that the beam alignment state is disturbed.

In addition, the conventional infrared gas detection apparatus is used by attaching a reflection mirror to the holder, when the temperature inside the absorption cell is raised to a high temperature or when gas containing water flows into the holder, the adhesion between the holder and the reflection mirror is reduced. Weakening caused a problem that the reflective mirror was easily removed. Therefore, in order to analyze the components of the gas containing moisture in a low temperature state it was necessary to remove the dispersed water droplets after the operation to remove moisture in advance, so that the occurrence of the error was a problem.

Therefore, the present invention has been proposed to solve the above problems, so that the holder for closing the opening of both ends of the absorption cell and the reflective curved surface reflected by the infrared rays on the holder is formed integrally toward the inside of the hollow portion. It is an object of the present invention to provide an infrared gas detection apparatus capable of minimizing disturbance of infrared beam alignment due to a difference in thermal expansion coefficient by manufacturing a reflection mirror.

In addition, the present invention provides an infrared gas detection apparatus that can be operated even at high temperatures by making the reflecting mirror made of a high temperature tempered glass such as Pyrex glass, it is possible to vaporize the measurement gas containing moisture to measure by measuring another There is a purpose.

In order to achieve the above object, the present invention is an infrared gas detector for transmitting the infrared rays through the measurement gas to detect the components and concentration of the measurement gas, comprising four panels having a hollow portion, the opposite panel is infrared An incidence hole and an infrared emission hole are formed, respectively, and reflecting mirrors reflecting infrared rays at right angles are installed at inner positions of the infrared incidence hole and the infrared emission hole, respectively; It characterized in that the gas component can be measured in a high temperature state, including a holder for closing the opening of both ends of the absorption cell, and a reflective mirror formed by the infrared reflecting on the holder toward the inside of the hollow portion.

Here, it is preferable that a gas hole through which the measurement gas flows in / out is formed on at least one panel of the absorption cell.

In addition, the reflective mirror is preferably processed integrally as a high temperature tempered glass.

In this case, the high temperature tempered glass may use Pyrex glass.

In addition, the pair of reflecting mirrors may be formed to have a curvature corresponding to a sphere serving as the center of the absorbing cell.

The following provides a preferred embodiment to help the understanding of the present invention. The following examples are provided to more easily understand the present invention, and the present invention is not limited by these examples.

The present invention has technical features in an absorption cell which is a component of an infrared gas detection device and a reflection mirror installed therein. Therefore, hereinafter, description will be given of the characteristic technical contents of the reflective mirror, and description of a configuration that is not mentioned can be coped with by a technique that can be easily implemented by those skilled in the art.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the present invention.

2 is an exploded perspective view showing a state in which an absorption cell and a reflection mirror are decomposed according to the present invention, and FIG. 3 is a simplified view of a path in which infrared rays incident into the absorption cell are reflected and emitted by the reflection mirror. It is a schematic diagram.

As shown in FIG. 2, the infrared gas detection device according to the present invention has a rectangular column-shaped absorbing cell 100 having a hollow portion and an opening 150 formed at both ends thereof, and the amount of the absorbing cell 100. It includes a pair of reflecting mirrors 200 which are respectively installed to close the opening 150.

When the measurement gas is introduced into the absorption cell 100, the absorption cell 100 performs an infrared ray IR input from the light source 10 in a multipath to provide an infrared ray IR absorbed and reacted with the measurement gas to the detector. . The absorption cell 100 is preferably made of aluminum alloy having excellent workability and chemical resistance and good thermal conductivity to maintain the internal temperature at a high temperature. For reference, the term “high temperature” referred to in the present invention refers to a temperature of 100 ° C. or higher at which water may vaporize into steam, and more specifically, a temperature of about 180 ° C.

Absorption cell 100 has a rectangular column shape having a hollow in the upper panel 110, the lower panel 120, the left end panel 130 and the right end panel 140 is combined so that the opening 150 is formed on both sides It is composed. Specifically, the absorption cell 100 is coupled to the lower end of the left end panel 130 and the right end panel 140 on both sides of the lower panel 120, the upper end of the upper end of the left end panel 130 and the right end panel 140 The panel 110 is coupled in parallel with the lower panel 120. Here, guide walls 132 and 142 for guiding the coupling of the upper panel 110 and the lower panel 120 may protrude from the inner side walls of the left end panel 130 and the right end panel 140.

The upper, lower, left and right end panels 110, 120, 130 and 140 are coupled to each other by a fastening member B such as a bolt is formed in the coupling hole (N) in the corresponding position as shown in the figure. In this case, mirror coupling holes MN are further formed on the front and rear sides of the left end panel 130 and the right end panel 140 to be coupled to the reflective mirror 200 to be described below.

The absorption cell 100 has a gas hole 111 through which measurement gas flows in and out and an infrared ray IR output from a light source is incident / emitted into the absorption cell 100 and infrared radiation is emitted. The hole 141 is formed.

Specifically, two gas holes 111 are formed on the upper surface of the upper panel 110 to allow the measurement gas to flow into / out of the absorption cell 100.

In addition, infrared (IR) is incident into the absorption cell 100 through the left end panel 130 and the right end panel 140 in the infrared incident hole 131 and the infrared emission hole 141 or to the outside of the absorption cell 100. It is formed in the left and right panels 130, 140, respectively, so as to be discharged. In this case, the infrared incident holes 131 and the infrared emission holes 141 formed in the left and right end panels 130 and 140 may be formed at positions facing each other.

Inside the absorption cell 100, a reflector 160 for reflecting the infrared rays IR at right angles is installed. Specifically, the first and second reflecting mirrors 160a and 160b are installed on the upper surface of the lower panel 120 of the absorption cell 100, but the first reflecting mirror 160a is an infrared incident hole 131 formed in the left end panel 130. It is installed at the inner position of the second reflector 160b is installed at the inner position of the infrared emission hole 141 formed in the right end panel 140. Accordingly, one side of the first and second reflectors 160a and 160b reflects the infrared light IR incident into the absorption cell 100 to the reflection mirror 200, and the other side is repeatedly reflected by the reflection mirror 200. The infrared ray (IR), which has been absorbed by the measurement gas, is reflected to be emitted to the outside of the absorption cell 100.

The reflection mirrors 200 are respectively installed at positions of the both ends of the absorption cell 100. The reflection mirror 200 is installed to face both ends of the absorption cell 100 so that infrared (IR) input from the light source 10 can pass through the absorption cell 100 and reach the detector 40. Infrared rays (IR) are reflected according to an accurate multiple light path.

The reflective mirror 200 includes a holder 210 for closing both end openings 150 of the absorption cell 100, and a reflective curved surface 220 formed on one side of the holder 210. At this time, the holder 210 and the reflective curved surface 220 is preferably formed integrally.

The holder 210 has a plurality of panel coupling holes (PN) formed in the corner region so that the reflective mirror 200 is installed at both ends of the absorption cell (100). The panel coupling hole (PN) is arranged side by side with the mirror coupling hole (MN) formed in the left end panel 130 and the right end panel 140 is coupled by a fastening member (B) such as a bolt. The reflective curved surface 220 is formed on one side of the holder 210 as described above. In detail, the reflective curved surface 220 forms a path of the infrared light IR so that the infrared light IR incident to the inside of the absorption cell 100 is repeatedly reflected and emitted to the outside of the absorption cell 100.

The reflective curved surface 220 is preferably formed to have the same radius of curvature in the pair of reflective mirrors 200 facing each other. Specifically, the pair of reflective curved surfaces 220 has a radius of curvature corresponding to the sphere when a sphere having a diameter connecting the positions of both reflective mirrors with respect to the center of the absorption cell 100 is formed.

The reflective mirror 200 is made of high temperature tempered glass to withstand high temperatures, and preferably made of Pyrex glass. As such, when the holder 210 and the reflective curved surface 220 of the reflective mirror 200 are integrally formed and manufactured using Pyrex, the absorber 100 may operate even if the inside of the absorption cell 100 rises to a high temperature so that the exhaust gas contains moisture. Can be measured from a high temperature state to a vaporized state, and it is possible to minimize the disturbance of the infrared (IR) beam alignment due to the difference in coefficient of thermal expansion.

FIG. 3 schematically shows a path in which infrared rays (IR) incident into the absorption cell 100 according to the present invention are reflected by the reflection mirror 200 and are emitted. As shown in the figure, the infrared light IR input from the light source 10 passes through the infrared incident hole 131 formed in the left end panel 130 and is incident into the absorption cell 100. At this time, the infrared ray (IR) incident inside the absorption cell 100 is reflected at right angles by the first reflecting mirror 160a to face the second reflecting mirror 200b. The infrared rays IR reaching the second reflecting mirror 200b are reflected toward the first reflecting mirror 200a by the reflection curved surface 220 formed on the second reflecting mirror 200b and the first reflecting mirror 200a. ) Is reflected back to the second reflection mirror 200b by the reflective curved surface 220 formed on the back side. As such, the infrared ray IR incident into the absorption cell 100 is repeatedly reflected between the first reflection mirror 200a and the second reflection mirror 200b by the reflection curved surface 220. If the measurement gas is introduced into the absorption cell 100 through the gas hole 111 during this process, the infrared ray IR is absorbed at a specific wavelength. In this way, the infrared ray (IR), which has absorbed a specific wavelength on the multiple light paths, is reflected by the second reflector 160b and passes through the infrared emission hole 141 formed in the right end panel 140 to be provided to the outside of the absorption cell 100. The detector 40 detects the absorption wavelength spectrum and examines the components of the measurement gas.

As described above, the gas measuring apparatus of the present invention having the above-described configuration vaporizes the moisture generated in the absorption cell in a high temperature state, thereby solving the problem that the conventional measurement had to be performed after removing the moisture in advance. .

On the other hand, the present invention is not limited to the above-described typical preferred embodiment, but can be carried out in various ways without departing from the gist of the present invention, various modifications, alterations, substitutions or additions in the art Anyone who has this can easily understand it. If the implementation by such improvement, change, replacement or addition falls within the scope of the appended claims, the technical idea should also be regarded as belonging to the present invention.

As described above, the infrared gas detection apparatus according to the present invention includes an absorbing cell having openings formed at both ends, and a reflecting mirror in which the holder and the reflective curved surface which integrally close the opening are integrally formed. There is an advantage in that the disturbance of the infrared beam alignment due to the difference in coefficient of thermal expansion caused by the difference can be minimized.

In addition, the infrared gas detection apparatus according to the present invention can be operated at a high temperature of more than 100 ℃ by manufacturing the reflection mirror made of a high temperature tempered glass such as Pyrex, it is possible to vaporize the gas containing water to measure the effect have.

Claims (5)

In the infrared gas detection device for transmitting the infrared rays through the measurement gas to detect the components and concentration of the measurement gas, It consists of four panels and has a hollow part, and opposite opposing panels are formed with an infrared incidence hole and an infrared emission hole, respectively, and the reflecting mirrors reflecting the infrared rays at right angles are installed at the inner positions of the infrared incidence hole and the infrared emission hole, respectively. A square pillar absorption cell having openings at both ends; A holder for closing both ends of the absorbent cell, and a reflective curved surface formed of the same material as the material of the holder and reflecting the infrared rays on the holder are formed toward the inside of the hollow portion, and the holder and the reflective curved surface are integrated. Infrared gas detection device, characterized in that the gas component can be measured in a high temperature state including a reflection mirror formed by. The method of claim 1, Infrared gas detection device, characterized in that the gas hole is formed on the at least one panel of the absorption cell flows into / out of the measurement gas. The method according to claim 1 or 2, The reflection mirror is an infrared gas detection device, characterized in that the processed high-temperature tempered glass. The method of claim 3, wherein The high temperature tempered glass is infrared gas detection apparatus, characterized in that the Pyrex glass. The method of claim 1, And the pair of reflective mirrors have a curvature corresponding to a sphere centered on the absorption cell.

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