KR102582615B1 - Optical Compensative Gas Measurement System - Google Patents

Abstract

The purpose of the present invention is to provide an optical compensating gas measurement system which can precisely measure the concentration of a measurement object without being affected by the surrounding environment. An optical compensating gas measurement system according to an embodiment of the present invention comprises a light source unit installed in a flow path and compensating for the amount of light change according to the surrounding environment, wherein the light source unit includes a base, a light source disposed on the base and emitting light to the area where a measurement target exists within the flow path, and a light amount detection sensor disposed on both sides of the light source on the base to detect the amount of light emitted from the light source.

Description

Optical Compensative Gas Measurement System

The present invention relates to a measurement system for measuring the concentration of gas, smoke, fine dust, etc., and more specifically, to a light-compensated gas measurement system that compensates for the amount of light from a light source affected by the surrounding environment.

Recently, as various industries have developed and factories are continuously operated by automated systems, dust such as fine dust and ultrafine dust is rapidly increasing.

In addition, as the number of automobiles increases exponentially in modern society, interest in harmful gases, which are the main causes of air pollution, smog, and acid rain, is increasing.

However, most of these dusts and harmful gases cannot be detected by humans, and even if detected, they can cause fatal damage to the human body in themselves, so the development of an optical measurement system to detect the presence or absence of various dusts or harmful gases is necessary. This is being done actively.

When light energy is irradiated to an area where there is an object to be measured, such as dust or harmful gas, only light energy within the absorption wavelength band is absorbed in proportion to the concentration of the detection object present in the area, and light with wavelengths other than the absorption band is absorbed. It is not transmitted and comes out. By measuring the light energy in the absorption band among the light transmitted in this way at the receiving end, the concentration of the measurement target can be quantitatively calculated.

This optical measurement system uses various light sources (e.g., filament lamps and LEDs that generate ultraviolet rays, infrared rays, and visible rays) that match the unique absorption wavelength depending on the spectroscopic properties of the target material to be measured. Even if the same current is applied to the light source, differences in brightness occur depending on the surrounding environment such as temperature and humidity, causing errors in the measuring instrument.

Accordingly, there is a need to develop an optical measurement system that can precisely measure the concentration of the measurement target without generating errors even if the surrounding environment changes.

Korean Patent Publication No. KR10-1839948 (registered on March 13, 2018)

The present invention provides a light-compensated gas measurement system that can precisely measure the concentration of a measurement target without being affected by the surrounding environment.

A light-compensated gas measurement system according to an embodiment of the present invention is a light-compensated gas measurement system including a light source unit installed in a flow path and compensating for the amount of light change according to the surrounding environment, wherein the light source unit is disposed on a base. It includes a light source that irradiates light to the area where the measurement target exists within the flow path, and a light quantity detection sensor disposed on both sides of the light source on the base to detect the amount of light irradiated from the light source.

It further includes a light receiving unit that detects the amount of light irradiated from the light source and passing through the measurement target, and a control unit that detects the concentration of the measurement target based on the difference between the amount of light irradiated from the light source and the amount of light detected by the light receiving unit, and the control unit detects the concentration of the measurement target from the light amount detection sensor. By controlling the power applied to the light source based on the amount of change in the sensed light amount, the amount of light emitted from the light source unit can be kept constant.

The light source unit is disposed on the base, and may further include a guide housing that surrounds and secures the light quantity detection sensor and guides the irradiation direction of the light source toward the measurement target.

The guide housing includes a support portion disposed at both bottoms and fixed to the base, and a body portion disposed on the base and the support portion and having an internal receiving space to surround the light intensity sensor, and the body portion has an opening that exposes one side of the light intensity sensor. It has a first surface formed, and the first surface may have a shape parallel to one surface of the light quantity detection sensor.

The body portion has a bent second surface disposed at the rear end of the first surface, and the light quantity detection sensor and the first surface of the body portion may be inclined in the direction of the light source.

The light-compensated gas measurement system according to an embodiment of the present invention improves the measurement reliability of the measurement target by compensating for the amount of light in the light source unit that can vary depending on the surrounding environment.

In addition, the light-compensated gas measurement system according to an embodiment of the present invention can improve measurement reliability by fixing the angle and position of the light quantity detection sensor so that it is not shaken by external forces.

Additionally, the light-compensated gas measurement system according to an embodiment of the present invention can guide the direction of light emitted from the light source to be concentrated.

In addition, the light-compensated gas measurement system according to an embodiment of the present invention integrates a configuration that improves the fixing force of the light amount detection sensor and a configuration that focuses the direction of light irradiated from the light source, making it easy to reduce manufacturing costs and miniaturize manufactured products. .

Figure 1 is a diagram showing a state in which a gas measurement system commonly used to measure exhaust emissions from gasoline vehicles is installed.
Figure 2 is a diagram showing a state in which a gas measurement system commonly used to measure exhaust emissions from diesel vehicles is installed.
Figure 3 is a block diagram briefly showing the configuration of a light-compensated gas measurement system.
Figure 4 is a perspective view showing a light source unit according to an embodiment of the present invention.
Figure 5 is an enlarged perspective view of the guide housing shown in Figure 4.

The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, and may be implemented in various other forms. The present embodiments are only provided to ensure that the disclosure of the present invention is complete and that the present invention is not limited to the embodiments disclosed below. It is provided to fully inform those skilled in the art of the scope of the invention, and the invention is merely defined by the claims. Like reference numerals refer to like elements throughout the specification.

The shapes, sizes, proportions, angles, numbers, etc. disclosed in the drawings for explaining embodiments of the present invention are illustrative, and the present invention is not limited to the matters shown. Like reference numerals refer to like elements throughout the specification. Additionally, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the gist of the present invention, the detailed description will be omitted.

When 'includes', 'has', 'consists of', etc. mentioned in this specification are used, other parts may be added unless 'only' is used. When a component is expressed in the singular, the plural is included unless specifically stated otherwise.

In the case of a description of a positional relationship, for example, if the positional relationship of two parts is described as 'on top', 'on the top', 'on the bottom', 'next to', etc., 'immediately' Alternatively, there may be one or more other parts placed between the two parts, unless 'directly' is used.

In the case of a description of a temporal relationship, for example, if a temporal relationship is described as 'after', 'successfully after', 'after', 'before', etc., 'immediately' or 'directly' Unless used, non-consecutive cases may also be included.

Although first, second, etc. are used to describe various components, these components are not limited by these terms. These terms are merely used to distinguish one component from another. Accordingly, the first component mentioned below may also be the second component within the technical spirit of the present invention.

Figures 1 and 2 are diagrams showing a state diagram in which a commonly used gas measurement system is installed.

Referring to FIG. 1, this is a general configuration of a light-compensated gas measurement system for measuring soot (G) of automobile gasoline, and light is transmitted into a flow path 20 through which soot flows in or out, and a flow path 20 where soot exists. It may include a light source unit 1 that irradiates, and a light receiver 2 that measures the amount of light passing through the soot.

Referring to FIG. 2, the general configuration of the light-compensated gas measurement system 10 for measuring exhaust gas (G) of automobile diesel includes a flow path 20 through which smoke flows in or out, and a flow path 20 where smoke exists. It may include a light source unit 1 that irradiates light, a light receiver 2 that measures the amount of light passing through the smoke, and a ventilation unit 3 disposed on the side of the flow path 20 to discharge the smoke out of the flow path 20. .

As shown in FIGS. 1 and 2, the gas measurement system is capable of quantitatively calculating the concentration of gas typically generated in automobiles, etc. using light, and is a light-compensated gas measurement system (10) according to an embodiment of the present invention. Can be applied to the gas measurement system such as Figures 1 and 2.

In addition, the light-compensated gas measurement system 10 according to an embodiment of the present invention is not limited to the system of FIGS. 1 and 2, and measures dust such as fine dust and ultrafine dust or gases such as smoke and harmful gases. It can be applied to any measurement system that can measure.

Hereinafter, the light-compensated gas measurement system 10 according to an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 3 is a block diagram briefly showing the configuration of the light-compensated gas measurement system 10, FIG. 4 is a perspective view showing the light source unit 100 according to an embodiment of the present invention, and FIG. 5 is a guide shown in FIG. 4. This is an enlarged perspective view of the housing 140.

Referring to FIGS. 3 to 5, the light-compensated gas measurement system 10 according to an embodiment of the present invention detects the concentration of the measurement target (G) present in the flow path 20, but may change depending on the surrounding environment. It is intended to maintain the amount of light of the light source unit 100 and includes a light source unit 100, a light receiving unit 200, and a control unit 300.

The light source unit 100 is a light source that irradiates light to the area where the measurement target (G) exists within the base 110 and flow path 20 where the light source 120, the light quantity detection sensor 130, and the guide housing 140 are placed. (120), a light quantity detection sensor 130 that is disposed on both sides of the light source 120 and detects the amount of light irradiated from the light source 120, and surrounds and secures the light quantity detection sensor 130, but controls the irradiation direction of the light source 120. It includes a guide housing 140 for guidance.

The base 110 is a plate on which the light source 120, the light quantity detection sensor 130, and the guide housing 140 are placed. Although shown in Figure 4 as a rectangular plate, the base 110 is not limited to this, and its shape can be changed as needed. You can. The base 110 may have a hollow formed at a position where the light source 120 and the guide housing 140 are disposed to couple the light source 120 and the guide housing 140.

The base 110 may include a detachably circular plate at the center. The light source 120, the light quantity detection sensor 130, and the guide housing 140 are disposed on a circular plate located at the center of the base 110.

The light source 120 irradiates light to the area where the measurement target (G) exists within the flow path 20. The light source 120 emits light in a wavelength range where the measurement target (G) has an absorption line, and can irradiate a required wavelength range depending on the measurement target (G), such as ultraviolet rays, infrared rays, or visible light.

The light source 120 may be composed of a filament lamp, a light emitting diode (LED), or a laser (ex. VCSEL laser, DFB laser, QCL laser, ICL laser, Fabry-Perot laser, etc.), but is not limited thereto. It can be formed in a configuration suitable for detecting the concentration of the measurement target (G).

Additionally, the light source 120 may be a single light source 120 that emits a single wavelength, but is not limited thereto and may include a plurality of light sources 120 operating at different wavelengths.

The light source 120 is connected to the control unit 300, and the amount of light emitted is adjusted according to the control of the applied power by the control unit 300. For example, the amount of light emitted by the light source 120 may be reduced as the power applied by the control unit 300 is reduced. Conversely, the light source 120 may increase the amount of light emitted by increasing the power applied by the control unit 300.

A pair of light quantity detection sensors 130 is disposed on both sides of the light source 120 and detects the quantity of light emitted from the light source 120. The light quantity detection sensor 130 is connected to the control unit 300 and transmits the detected light quantity to the control unit 300. The light quantity detection sensor 130 has one surface in contact with the light source 120 formed as a rectangular flat surface so that it can detect the quantity of light emitted from the light source 120 with high accuracy.

The light quantity detection sensor 130 may include a sensor body 131 that detects the light quantity, and a support leg 132 that extends from the sensor body 131, is bent, and is coupled to the base 110.

The guide housing 140 surrounds each pair of light intensity sensors 130 and secures them to the base 110. In order to accurately measure the amount of light emitted from the light source 120, the position and angle of the light amount detection sensor 130 are important, but it is difficult to position the light amount detection sensor 130 at an accurate position and angle, so the light amount detection sensor ( Installation of the light quantity detection sensor 130 is facilitated through the guide housing 140 surrounding the 130). In addition, in order to accurately measure the amount of light emitted from the light source 120, it is important to fix the light amount detection sensor 130 without being shaken by external force. The light amount is measured through the guide housing 140 surrounding the light amount detection sensor 130. Improves the fixing force of the detection sensor 130 to the base 110.

The guide housing 140 includes a support portion 141 disposed at both bottoms and fixed to the base 110 to improve fixing force, and a body portion 142 surrounding the light amount detection sensor 130. The support portion 141 and the body portion 142 of the guide housing 140 will be injected to be formed as a single piece, but this is not limited to this, and the support portion 141 and the body portion 142 may be configured to be combined as needed. there is.

The support portion 141 includes a contact surface coupled to the base 110 to increase fixation force, and is coupled through a hollow formed in the base 110.

The body portion 142 is disposed on the support portion 141 and the base 110, and a space in which the light amount detection sensor 130 is accommodated is formed. The body portion 142 surrounds the light quantity detection sensor 130 through the internal space and becomes integrated, thereby improving the fixing force of the light quantity detection sensor 130 to the base 110 and preventing shaking.

The body portion 142 may include a first surface 1421 facing the light source 120 and a second surface 1422 disposed at the rear end of the first surface 1421. A first opening 1421a is formed on the first surface 1421 of the body 142 to expose one surface of the light quantity detection sensor 130. The first surface 1421 has a shape parallel to one surface of the light quantity detection sensor 130 and can guide the irradiation direction of the light source 120.

The second surface 1422 is arranged to be bent at the rear end of the first surface 1421 and has a second opening 1422a through which the support leg 132 of the light amount detection sensor 130 can be exposed. The light quantity detection sensor 130 is connected to the guide housing 140 and the sensor body 131 is fixed through the support leg 132 that passes through the second opening 1422a of the first and second surfaces 1422. Fixing force is improved through the second fixation that is directly coupled to the base 110.

Additionally, the body portion 142 of the guide housing 140 may be formed such that its first surface 1421 is inclined at a predetermined angle in the direction of the light source 120. Accordingly, the first surface 1421 of the guide housing 140 can guide the irradiation direction of the light source 120 to focus on the center.

The body portion 142 may further include a third surface 1423 disposed on top of the first surface 1421 and the second surface 1422. The third surface 1423 includes a coupling protrusion and is detachably coupled to the first surface 1421 and the second surface 1422. The third surface 1423 is separated from the first surface 1421 and the second surface 1422, so that the light amount detection sensor 130 can be easily seated inside the body portion 142.

The guide housing 140 may further include a fastening leg portion 143 extending from the bottom of the support portion 141. The fastening leg portion 143 includes a coupling leg extending from the bottom of the support portion 141 and a fastening member detachably coupled to the coupling leg.

The light receiving unit 200 is configured to include an element that detects light, detects light irradiated from the light source 120 and passes through the measurement object (G), and transmits the sensed amount of light to the control unit 300. The light receiving unit 200 may be composed of an element for detecting light, such as a PIN Photo Diode (PD), Avalanche Photo Diode (APD), or Laser Diode (LD), and is not limited to the above-described configuration, but may vary depending on the type of light source unit 100. Accordingly, it may be composed of an appropriate light detection element.

The control unit 300 calculates the concentration of the measurement target (G) based on the information on the amount of light irradiated from the light source unit 100 and the amount of light detected by the light receiving unit 200 after passing through the measurement target (G).

Additionally, the control unit 300 receives the light amount information detected from the light amount detection sensor 130 and compensates so that the amount of light emitted from the light source 120 is constant. For example, if the amount of light received from the light amount detection sensor 130 is decreasing due to changes in temperature and humidity, the power applied to the light source 120 is increased to compensate for the insufficient amount of light.

As another example, if the amount of light received from the light amount detection sensor 130 is increasing based on changes in temperature and humidity, the power applied to the light source 120 is reduced to control the increased amount of light to be reduced.

The description of the present invention described above is for illustrative purposes, and those skilled in the art will understand that the present invention can be easily modified into other specific forms without changing the technical idea or essential features of the present invention. will be. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive. For example, each component described as single may be implemented in a distributed manner, and similarly, components described as distributed may also be implemented in a combined form.

The scope of the present invention is indicated by the claims described below rather than the detailed description above, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention. do.

10: Optically compensated gas measurement system,
100: light source, 110: base,
120: light source, 130: light quantity detection sensor,
131: sensor body, 132: support leg
140: guide housing, 141: support,
142: body portion, 143: fastening leg,
200: light receiving unit, 300: control unit

Claims (5)

In the light compensation type gas measurement system having a light source installed in the flow path and compensating for the amount of light change according to the surrounding environment,
The light source unit includes a base, a light source placed on the base to irradiate light to the area where the measurement target exists in the flow path, a light quantity detection sensor placed on both sides of the light source on the base to detect the amount of light irradiated from the light source, and placed in the base. It includes a guide housing that surrounds and secures the light quantity detection sensor and guides the irradiation direction of the light source toward the measurement target,
A light receiving unit that detects the amount of light irradiated from the light source and passing through the measurement object; and
It further includes a control unit that detects the concentration of the measurement target based on the difference between the amount of light emitted from the light source and the amount of light detected by the light receiver,
The control unit controls the power applied to the light source based on the amount of change in light detected by the light sensor to keep the amount of light emitted from the light source constant.
The light quantity detection sensor includes a sensor body that detects light quantity and a support leg that is extended and bent from the sensor body and coupled to a base,
The guide housing consists of a support part arranged at both bottoms and fixed to the base, a body part placed on the base and the support part and having an internal accommodation space to surround the light quantity detection sensor, a fastening leg part extending from the support part, and a detachable fastening leg part. Includes a fastening member that is coupled,
The body portion includes a first opening exposing one side of the light intensity sensor, a first surface having a plane shape parallel to one side of the light intensity sensor, and a second opening through which the support leg of the light intensity sensor can be exposed,
The support leg of the light quantity detection sensor is exposed through the second opening and is directly coupled to the base,
A light-compensated gas measurement system in which the first side of each guide housing disposed on both sides of the light source is inclined in the direction of the light source.
delete delete delete According to paragraph 1,
A light-compensated gas measurement system where the body portion is disposed at the rear end of the first side and has a bent second side.

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