TWI687668B - Gas quality monitoring device - Google Patents

Abstract

A gas quality monitoring device is provided, which includes a lighting component and a monitoring sensing element. The lighting component has a lighting element and a focus lens. The lighting element emits a light beam going through the focus lens then forms a focus beam in a monitoring area. Part of the focus beam forms a monitoring light which is reflected light. The monitoring sensing element is used for sensing light signal of the monitoring light. The sensing surface of the monitoring sensing element is parallel to the path of the light beam.

Description

Gas quality monitor

The invention relates to a gas quality monitor, in particular to a gas quality monitor that can improve monitoring accuracy and provide correction.

The gas is filled with suspended particles of various particle sizes. For example, suspended particles with a particle size less than or equal to 2.5 μm are called PM2.5, and suspended particles with a particle size less than or equal to 10 μm are called PM10.

The New England Journal of Medicine pointed out that every 10 micrograms of PM2.5 will increase the incidence of lung cancer by 10%, and various types of cancer will also increase by 5%; and the World Health Organization also mentioned that every 10μg/m3 increase in PM10 will increase With a mortality rate of 0.2-0.6%, each additional PM2.5 of 10 μg/m3 will increase the mortality of cardiopulmonary diseases by 6-13%. Therefore, governments and people of various countries have paid more and more attention to the detection of gas quality.

For PM2.5, the conventional monitor is mainly composed of a light-emitting element and a sensing element. The light-emitting element emits detection light to the gas to be detected, and the sensing element senses the scattered light. A processor calculates the concentration of suspended particles contained in the gas based on the light signal of the scattered light.

However, the reliability of the above-mentioned conventional monitors is low. After a long period of use, the deterioration of the light-emitting element or the sensing element may cause measurement deviation. In addition, large particles of suspended particles are not properly processed, resulting in a drop in accuracy. Furthermore, the concentration detection interval Narrow, it can only detect high concentrations; the large gap between suspended particles (even up to 100%) also makes it difficult to calibrate conventional monitors.

According to this, how to have a "gas quality monitor" that can improve the monitoring accuracy and provide correction is a problem that people in the related technical fields need to solve urgently.

In one embodiment, the present invention provides a gas quality monitor, including: a light-emitting component, including a light-emitting element and a focusing mirror, the light-emitting element emits a light beam passing through the focusing mirror to form a focused beam focused on a monitoring area, part of the focused beam Forming a monitoring light, the monitoring light is reflected light; and a monitoring light sensing element for sensing the optical signal of the monitoring light, the sensing surface of the monitoring light sensing element is parallel to the optical path of the light beam; wherein, the light emitting element and A beam splitter is arranged between the focusing mirrors, and the monitoring light enters the beam splitter to generate a split beam to enter the monitoring light sensing element. The light emitting component, the monitoring light sensing element and the beam splitter are arranged in a shell In the body, the housing is provided with a light-transmitting area corresponding to the light path of the light beam.

100, 200: gas quality monitor

10: Light emitting components

11: Light emitting element

12: Focusing lens

13: Monitoring area

20: Monitor light sensing elements

21: Sensing surface

22: Monitoring lens

30: penetrating light sensing element

31: Sensing surface

32: penetrating lens

40: Beamsplitter

50: shell

51: Light transmitting area

L1: beam

L2: Focused beam

L3: Monitoring light

L4, L6: parallel light

L5: Penetrating light

L7: split beam

FIG. 1 is a schematic structural diagram of an embodiment of the invention.

2 is a schematic structural diagram of another embodiment of the present invention.

FIG. 3 is a schematic structural view of the embodiment of FIG. 2 disposed in the housing.

Please refer to the embodiment shown in FIG. 1, the gas quality monitor 100 includes a light emitting element 10 and a monitoring light sensing element 20.

The light-emitting assembly 10 includes a light-emitting element 11 and a focusing mirror 12. The light-emitting element 11 emits a light beam L1 through the focusing mirror 12 to form a focused light beam L2 to focus on a monitoring area 13. The partially focused light beam L2 forms a monitoring light L3. In this embodiment, the monitoring light L3 is scattered light.

The sensing surface 21 of the monitoring light sensing element 20 is parallel to the optical path of the light beam L1. A monitoring lens 22 is provided between the monitoring light sensing element 20 and the monitoring area 13. After the monitoring light L3 strikes the monitoring lens 22, a parallel light L4 is formed, and then enters the monitoring light sensing element 20. The optical signal of the parallel light L4 (equivalent to the monitoring light L3) is sensed by the monitoring light sensing element 20.

A penetrating light sensing element 30 is provided on the side of the monitoring area 13 opposite to the light emitting element 11, and the sensing surface 31 of the penetrating light sensing element 30 faces the monitoring area 13, penetrating the light sensing element 30 and monitoring A penetrating lens 32 is provided between the areas 13, and another part of the focused light beam L2 forms penetrating light L5 and strikes the penetrating lens 32 to form a parallel light L6, and then enters the penetrating light sensing element 30. The sensing element senses the optical signal of parallel light L6 (equivalent to transmitted light L5).

The light emitting element 10, the monitoring light sensing element 20 and the through light sensing element 30 can be disposed at different spatial positions without being limited to the same plane, the principle of the arrangement is that the light emitting element and the through light sensing element 30 are relatively arranged in the monitoring area 13 on both sides, and the sensing surface 21 of the monitoring light-sensing element 20 only needs to face the monitoring area 13.

In this embodiment, by monitoring the light-scattering rate signal of the light beam sensed by the light sensing element 20 and the absorption rate signal of the light beam sensed by the penetrating light sensing element 30, the accuracy of gas detection can be improved Under normal circumstances, the measurement rate of the monitoring light-sensing element 20 and the penetrating light-sensing element 30 should be one high and one low. Correct the signal-to-noise ratio, algorithm, regression analysis, etc. of the detected signal. , The gas quality monitor 100 can be calibrated. If the signal values detected by the monitoring light-sensing element 20 and the penetrating light-sensing element 30 are both high or low, it can be immediately determined which sensing element is faulty and repaired or replaced.

Please refer to the embodiment shown in FIG. 2, the gas quality monitor 200 includes a light emitting component 10 and a monitoring light sensing element 20.

The light-emitting assembly 10 includes a light-emitting element 11 and a focusing mirror 12, and a dichroic mirror 40 is provided between the light-emitting element 11 and the focusing mirror 12. The light emitting element 11 emits the light beam L1 through the focusing mirror 12 to form a focused light beam L2 to focus on a monitoring area 13. The partially focused light beam L2 forms a monitoring light L3. In this embodiment, the monitoring light L3 is reflected light.

The sensing surface 21 of the monitoring light sensing element 20 is parallel to the optical path of the light beam L1. After the monitoring light L3 enters the dichroic mirror 40, a sub-beam L7 is generated and enters the monitoring light sensing element 20. The monitoring light sensing element 20 senses the optical signal of the sub-beam L7 (equivalent to the monitoring light L3).

Referring to the embodiment shown in FIG. 3, the light-emitting assembly 10, the monitoring light sensing element 20 and the beam splitter 40 are disposed in a housing 50. The housing 50 has a light-transmitting area 51 corresponding to the optical path of the light beam L1. The materials of the housing 50 and the light-transmitting area 51 are not limited, and may be the same or different. For example, in order to provide the focused beam L2 and the monitoring light L3 to exit and enter the housing 50, the light-transmitting area 51 may use transparent glass or other light-transmitting Good quality material.

Please refer to FIGS. 1 and 2. The light-emitting element 11 of the present invention may be a laser semiconductor or a laser diode, and the light beam L1 is a laser beam. The forms of the monitoring light sensing element 20 and the penetrating light sensing element 30 are not limited, and for example, a photosensitive wafer may be used. The monitoring light sensing element 20 is coupled to a processor (not shown in the figure), and the processor calculates the suspended particles contained in the gas in the monitoring area 13 according to the optical signal sensed by the monitoring light sensing element 20 (for example PM10, PM2.5) concentration.

In summary, the gas quality monitor provided by the present invention can indeed achieve the functions of improving monitoring accuracy and providing correction. It is worth noting that the main architectures of FIG. 1 and FIG. 2 are the same, both include a light-emitting element 10 and a monitoring light sensing element 20. Under this architecture, together with the penetrating light sensing element 30 or the beam splitter 40, Further obtain other effects.

However, the specific embodiments described above are only used to illustrate the features and effects of the present invention, rather than to limit the scope of the invention, and any application without departing from the spirit and technical scope of the invention The equivalent changes and modifications completed by the disclosure of the present invention should still be covered by the following patent application scope.

200: gas quality monitor

10: Light emitting components

11: Light emitting element

12: Focusing lens

13: Monitoring area

20: Monitor light sensing elements

21: Sensing surface

40: Beamsplitter

L1: beam

L2: Focused beam

L3: Monitoring light

L7: split beam

Claims (6)

A gas quality monitor includes a light-emitting component including a light-emitting element and a focusing mirror. The light-emitting element emits a light beam passing through the focusing mirror to form a focused light beam and focuses on a monitoring area. Part of the focused light beam forms a monitoring light. The monitoring light is reflected light; and a monitoring light sensing element for sensing the optical signal of the monitoring light, the sensing surface of the monitoring light sensing element is parallel to the optical path of the light beam; wherein, the light emitting element and the focusing There is a beam splitter between the mirrors, and the monitor light enters the beam splitter to generate a beam of light to enter the monitor light sensing element. The gas quality monitor as described in item 1 of the patent application scope, wherein the light emitting component, the monitoring light sensing element and the beam splitter are disposed in a housing, and the housing is provided with a light transmission corresponding to the optical path of the light beam Area. The gas quality monitor as described in item 1 of the patent application scope, wherein the beam is a laser beam. The gas quality monitor as described in item 1 of the patent application scope, wherein the light emitting element is a laser semiconductor or a laser diode. The gas quality monitor as described in item 1 of the patent application scope, wherein the monitoring light sensing element is a photosensitive wafer. The gas quality monitor as described in item 1 of the patent application scope, wherein the monitoring light sensing element is coupled to a processor, and the processor calculates the light signal according to the optical signal sensed by the monitoring light sensing element The concentration of suspended particles contained in the gas in the monitoring area.

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