TW201738553A - Gas detection device - Google Patents

Abstract

The instant disclosure provides a gas detection device including a chamber module, a light module, and an optical sensing module. The chamber module includes a condenser chamber, receiving chamber, and sampling chamber. The condenser chamber includes a first reflective structure and a second reflective structure. The first reflective structure includes a first focal point and a second focal point. The second reflective structure includes a center point. The first focal point corresponds to the center point. The light module disposed on the condenser chamber to generate a light. The light module includes a light unit, wherein the light unit corresponds to the first focal point and center point. The optical sensing module includes optical sensing unit, wherein the optical sensing unit disposed in the receiving chamber.

Description

Gas measuring device

The present invention relates to a gas measuring device, and more particularly to a gas measuring device capable of measuring gas concentration.

First of all, the carbon dioxide detection devices or carbon dioxide analyzers currently on the market almost all use the non-dispersive infrared (NDIR) absorption method to detect the gas concentration, which is mainly based on the Beer-Lambert law. Beer-Lambert law) for calculations. Its principle is to use a gas to absorb the specific wavelength of infrared rays and the concentration of gas is proportional to the amount of absorption to detect specific gas concentrations. For example, carbon monoxide has the strongest absorption of 4.7 micrometer (μm) wavelength and carbon dioxide to infrared light of 4.3 micrometer (μm) wavelength.

The measurement accuracy of the gas concentration measuring device currently on the market is still limited by the structural design of the gas sampling chamber. When the amount of infrared light projected to the infrared sensor is reduced, the measurement accuracy of the gas concentration will be affected. In the "gas concentration detecting device" patent of the patent publication No. TWI513973, since the first open end 22 of the detecting unit 2 for accommodating the light source emitter 3 does not have a special structural design, the light source cannot be effectively utilized. Light generated by the emitter 3.

In addition, in the patent application "High-efficiency non-dispersive infrared air cavity" of the patent publication No. TWM476923, the elliptical bifocal characteristic is mainly used, the infrared light source is placed at a focus, and the infrared sensor is placed at another focus. Achieve high concentrating while meeting the narrow incident angle requirements required for infrared sensors. However, although the TWM476923 patent can effectively improve the light collecting property, the length of the infrared gas chamber body 200 will be increased by utilizing the characteristics of the elliptical bifocal. Furthermore, it is also Due to the error caused by the production assembly process, the infrared sensor is not in the correct focus position, which causes the infrared sensor to receive the signal.

Further, in a typical infrared light sensor, when the incident angle of the incident light projected onto the infrared light sensor is greater than 20 degrees, the filter peak will be caused by the filter having a certain band width. The shift to short wavelength is about 40 nm (nanometer). Thereby, a part of the light which is not absorbed by the gas to be tested is projected to the infrared light sensor, and another part of the light which is correlated with the gas concentration to be measured is intercepted, thereby reducing the signal intensity and thereby reducing The actual measurement accuracy.

Therefore, how to provide a gas measuring device capable of effectively improving the light collecting property, avoiding the influence of production assembly deviation and shortening the length of the gas sampling chamber, to overcome the above-mentioned defects, has become an important subject to be solved by the technology.

The technical problem to be solved by the present invention is to provide a gas measuring device capable of effectively improving the light collecting property by utilizing the concentrating cavity formed by the first reflecting structure and the second reflecting structure in view of the deficiencies of the prior art.

In order to solve the above technical problem, one of the technical solutions adopted by the present invention is to provide a gas measuring device, which comprises a cavity module, a light emitting module and a light sensing module. The cavity module includes a concentrating cavity, an accommodating cavity, and a sampling cavity connected between the concentrating cavity and the accommodating cavity, wherein the concentrating cavity has a first reflective structure and a second reflective structure connected to the first reflective structure, the first reflective structure having a first focus and a second focus corresponding to the first focus, the second The reflective structure has a center point, and the first focus and the center point are disposed opposite each other. The light emitting module is disposed on the concentrating cavity to generate a light T. The light emitting module includes a light emitting unit, wherein the light emitting unit corresponds to the first focus and the center point. The light sensing module includes a light sensing unit, and the light sensing unit is disposed in the receiving cavity.

The gas measuring device provided by the embodiment of the present invention can utilize the “the first reflecting structure having a first focus and a second focus corresponding to the first focus, the first The two-reflection structure has a center point, the first focus and the center point are disposed corresponding to each other and the technical feature of the light-emitting unit corresponding to the first focus and the center point to improve the cavity The light collection of the module.

For a better understanding of the features and technical aspects of the present invention, reference should be made to the accompanying drawings.

Q‧‧‧Gas measuring device

1,1',1",1'''‧‧‧ cavity module

1a‧‧‧Upper cavity module

1b‧‧‧ lower cavity module

11‧‧‧Concentrating cavity

111‧‧‧First reflection structure

112‧‧‧Second reflective structure

12‧‧‧ accommodating cavity

13,13'‧‧‧Sampling chamber

131,131’‧‧‧ first open end

132,132’‧‧‧second open end

133,133’‧‧‧ upper surface

134,134'‧‧‧ lower surface

135‧‧‧ gas diffusion tank

14‧‧‧Light Guide

141‧‧‧Lighting surface

15‧‧‧ slotting

16‧‧‧ gas filtration membrane

2‧‧‧Lighting module

21‧‧‧Lighting unit

22‧‧‧Connecting line

3‧‧‧Light sensing module

31‧‧‧Light sensing unit

32‧‧‧Connecting line

4‧‧‧Substrate module

F1‧‧‧ first focus

F2‧‧‧second focus

O‧‧‧ Center Point

T‧‧‧Light

T1, T1’, T1”‧‧‧ first light

T11, T11’‧‧‧ first projected light

T12, T12’‧‧‧ first reflected light

T2‧‧‧second light

T21‧‧‧second projected light

T22‧‧‧second reflected light

T23‧‧‧third reflected light

L1, L1’‧‧‧ first predetermined distance

L2, L2’‧‧‧ second predetermined distance

H‧‧‧Predetermined height

W‧‧‧Predetermined width

α‧‧‧Predetermined angle

,,β’‧‧‧ angle

Θ1, θ1'‧‧‧ first incident angle

Θ2, θ2'‧‧‧second angle of incidence

HH‧‧‧ horizontal axis

VV‧‧‧vertical axis

S‧‧‧Sampling space

K1, K2‧‧‧ fixing holes

E‧‧‧Elliptical curvature surface

C‧‧‧Rounded Curvature Surface

1 is a schematic perspective view of one of the gas measuring devices of the first embodiment of the present invention.

2 is another schematic perspective view of the gas measuring device according to the first embodiment of the present invention.

3 is a perspective exploded view of the gas measuring device according to the first embodiment of the present invention.

4 is another perspective exploded view of the gas measuring device according to the first embodiment of the present invention.

Figure 5 is a perspective cross-sectional view showing a gas measuring device according to a first embodiment of the present invention.

Figure 6 is a side cross-sectional view showing the gas measuring device of the first embodiment of the present invention.

Fig. 7 is a schematic view showing a light projection of the gas measuring device according to the first embodiment of the present invention.

Fig. 8 is a schematic view showing another ray projection of the gas measuring device according to the first embodiment of the present invention.

Fig. 9 is a side elevational view showing the gas measuring device of the first embodiment of the present invention.

Figure 10 is a side elevational view showing one embodiment of a gas measuring device according to a first embodiment of the present invention.

Figure 11 is a side elevational view showing another embodiment of the gas measuring device according to the first embodiment of the present invention.

Fig. 12 is a partially enlarged schematic view showing a portion A of Fig. 11;

Figure 13 is a side elevational view showing one embodiment of a gas measuring device according to a second embodiment of the present invention.

Figure 14 is a side elevational view showing another embodiment of a gas measuring device according to a second embodiment of the present invention.

Fig. 15A is a schematic perspective cross-sectional view showing an embodiment of a gas measuring device according to a third embodiment of the present invention.

Figure 15B is a schematic perspective cross-sectional view showing another embodiment of a gas measuring device according to a third embodiment of the present invention.

Figure 15C is a perspective, cross-sectional view showing still another embodiment of the gas measuring device according to the third embodiment of the present invention.

The following is a description of an embodiment of the present invention relating to a "gas measuring device" by a specific specific example, and those skilled in the art can understand the advantages and effects of the present invention from the contents disclosed in the present specification. The present invention may be carried out or applied in various other specific embodiments, and various modifications and changes can be made without departing from the spirit and scope of the invention. In addition, the drawings of the present invention are merely illustrative and are not intended to be construed in terms of actual dimensions. The following embodiments will further explain the related technical content of the present invention, but the disclosure is not intended to limit the technical scope of the present invention.

First embodiment

First, referring to FIG. 1 to FIG. 5, a first embodiment of the present invention provides a gas measuring device Q, which includes a cavity module 1, a light emitting module 2, a light sensing module 3, and a Substrate module 4. The light-emitting module 2 and the light-sensing module 3 are electrically connected to the substrate module 4. The substrate module 4 can also be connected to a display unit (not shown) and a control unit (not shown). And a processing unit (not shown) is electrically connected. For example, the light-emitting module 2 can be an infrared light-emitting device that generates an infrared light source, and the light-sensing module 3 is an infrared light sensor, for example, a single-channel infrared light sensor, or a dual-channel infrared light sensor. One of the infrared collection windows can be used to detect the gas concentration, and the other infrared collection window can be used to detect the aging of the infrared light source, and has the function of mutual correction. However, the invention is not limited thereto.

Thereby, the gas measuring device Q provided by the embodiment of the invention can measure the to be inspected The concentration of the gas or other properties is measured. Incidentally, the gas to be detected may be carbon dioxide, carbon monoxide or a combination of carbon dioxide and carbon monoxide, and the present invention is not limited by the gas to be detected. In other words, different gases to be detected can be measured by different light-emitting modules 2 and light-sensing modules 3. For example, in terms of measuring the gas concentration, different wavelengths of the gas to be detected can be measured by changing the wavelength filter (filter) on the light sensing module 3.

Then, as shown in FIG. 5 and FIG. 6 , the cavity module 1 has a sampling space S, and the cavity module 1 includes a concentrating cavity 11 , a receiving cavity 12 , and a connection The optical cavity 11 and the sampling cavity 13 between the accommodating cavities 12. The light emitting module 2 can include a light emitting unit 21, and the light emitting unit 21 can be disposed on the light collecting cavity 11 to generate a light T, such as infrared light. The light sensing unit 3 can include a light sensing unit 31. The light sensing unit 31 can be disposed in the receiving cavity 12 to receive the light T generated by the light emitting unit 21.

In addition, as shown in FIG. 1 to FIG. 4, the cavity module 1 can be composed of an upper cavity module 1a and a lower cavity module 1b for manufacturing and assembly. For example, the upper cavity module 1a and the lower cavity module 1b can be screwed into the fixing hole K1 by using a locker (not shown) to combine the upper cavity module 1a and the lower cavity module. 1b. The cavity module 1 can also be screwed into the fixing hole K2 by a locking member (not shown) to fix the cavity module 1 to the substrate module 4. It is to be noted that the substrate module 4 can be a printed circuit board (PCB). The light module 2 can further include a connecting line 22, and the light sensing module 3 can further include a connecting line 32. The connecting line 22 of the light-emitting module 2 and the connecting line 32 of the light-sensing module 3 can firmly fix the light-emitting unit 21 and the light-sensing unit 31 to the substrate module 4 by welding to prevent external contact and cause poor contact. The situation arises.

Next, please refer to FIG. 5 to FIG. 6 at the same time, the sampling cavity 13 may have a rectangular shape, such as a rectangular shape, but the invention is not limited thereto. It should be noted that the sampling cavity will be further described in the third embodiment. The shape of the body 13. The respective surfaces inside the sampling cavity 13 may be provided with a surface 133, a lower surface 134 and a side surface (not labeled). A reflective layer (not shown) may be formed in the sampling cavity 13 by metal plating or plastic plating. The reflective layer may be composed of a gold-containing metal, a nickel metal or a mixture of gold metal and nickel metal. Thereby, the rectangular shaped sampling cavity 13 is like a rectangular optical integrator, and the working principle is that the light T generated by the light emitting module 2 is reflected back and forth in the sampling cavity 13 through the reflective layer in the sampling cavity 13 so that The light rays T generated by the light-emitting module 2 are superimposed on each other in the sampling cavity 13 so that the superimposed light rays T can be uniformly distributed.

In the above, the sampling cavity 13 is further provided with one or more gas diffusion grooves 135 vertically penetrating the upper surface 133 or the lower surface 134 of the sampling cavity 13, and the gas diffusion groove 135 may be disposed at the first open end of the sampling cavity 13. Between 131 and the second open end 132. In addition, the gas diffusion groove 135 has a rectangular shape. As shown in FIG. 6, the cross-sectional shape of the gas diffusion groove 135 may have a V-shape, so that the gas to be detected passes through the Bernoulli's principle, allowing the gas to flow through. In the case of the gas diffusion groove 135 having a V shape, the gas flow rate is increased by the size of the V-shaped gas diffusion groove 135, so that the gas diffusion speed is faster and the measurement time is shortened. Further, the cavity module 1 further includes a gas filter membrane 16 disposed on the gas diffusion tank 135. For example, the gas filter membrane 16 can be a waterproof gas permeable membrane to prevent the aerosol of the gas to be detected from entering. In the cavity module 1, the internal cavity of the cavity module 1 is polluted or the measurement accuracy is affected.

The first embodiment of the present invention further includes a cavity module 13 and a receiving cavity 12 . The light guiding portion 14 and the light guiding portion 14 may have a light guiding surface 141 to reflect the light T generated by the light emitting unit 21 into the light sensing unit 31 through the light guiding surface 141. For example, the light guiding surface 141 may be coated with the foregoing reflective layer (not shown), or the light guiding surface 141 may be a mirror. The invention is not limited thereto. In addition, the cavity module 1 can further include a slot 15 , and the slot 15 can be connected between the light guiding portion 14 and the receiving cavity 12 . Thereby, the lower surface 134 of the sampling cavity 13 and the light sensing unit 31 are spaced apart from each other by a predetermined height H (refer to FIG. 9). With this, The light T generated by the light emitting unit 21 can be projected onto the light sensing unit 31 by the light emitting unit 21 in a substantially "L" shape. It should be noted that in other embodiments (such as the second embodiment), the light guiding portion 14 may not be disposed, so that the light T generated by the light emitting unit 21 is reflected by the upper surface 133 and the lower surface 134. Then, it is directly projected into the light sensing unit 31.

Next, please refer to FIG. 6 to FIG. 8 at the same time, and the relationship between the path of the light T projected by the light-emitting unit 21 and the cavity module 1 will be further described below. The concentrating cavity 11 can have a first reflective structure 111 and a second reflective structure 112 connected to the first reflective structure 111. For example, the curvatures of the first reflective structure 111 and the second reflective structure 112 are different. The first reflective structure 111 may have an elliptical curvature surface E, and the second reflective structure 112 may have a perfect circular curvature surface C. Thereby, the first reflective structure 111 has a first focus F1 and a second focus F2 corresponding to the first focus F1, the second reflective structure 112 has a center point O, and the first focus F1 of the first reflective structure 111 is The center points O of the second reflective structures 112 are disposed corresponding to each other. For example, the first focus F1 and the center point O may overlap each other. However, the present invention is not limited thereto. In other embodiments, the first focus F1 and the center point O may be disposed very close to each other. In addition, the light emitting unit 21 may be disposed corresponding to the first focus F1 and the center point O. Preferably, the light emitting unit 21 can be directly disposed on the first focus F1 and the center point O.

In the above, the light T includes a first projected light T11 projected on the first reflective structure 111 and a second projected light T21 projected on the second reflective structure 112. The first projected light T11 and the second generated by the light emitting unit 21 The projected light T21 can be reflected by the curved surfaces of the first reflective structure 111 and the second reflective structure 112 to form the first light T1 and the second light T2 projected onto the light sensing module 3, respectively.

In view of the above, please refer to FIG. 7, the light path of the light-emitting unit 21 projected on the first reflective structure 111 will be described below. In detail, the first projected light T11 can be reflected by the first reflective structure 111 to form a first reflected light T12 projected to the second focus F2 of the first reflective structure 111, whereby the first projected light T11 and The first reflected light T12 cooperates with each other to form a first light T1 projected onto the light sensing unit 31. In other words, the first reflected light T12 can be reflected by the upper surface 133 and the lower surface 134 in the sampling cavity 13 to form a first light T1 projected to the light sensing unit 31.

In view of the above, please refer to FIG. 8, and the light path of the light-emitting unit 21 projected on the second reflective structure 112 will be described below. The second projected light T21 is reflected by the second reflective structure 112 to form a second reflected light T22 projected to the first reflective structure 111, and the second reflected light T22 is reflected by the first reflective structure 111 to form a projection to The third reflected light T23, the second projected light T21, the second reflected light T22, and the third reflected light T23 of the second focus F2 of the first reflective structure 111 cooperate with each other to form a first projection onto the light sensing unit 31. Two rays T2. It should be noted that, in principle, the second reflected light T22 can pass through the center point O of the second reflective structure 112 and the first focus F1 of the first reflective structure 111, but to avoid confusion, the second reflection shown in FIG. The light ray T22 is presented in such a manner that it does not pass through the first focus F1.

Next, referring to FIG. 9 , in detail, the sampling cavity 13 has a first open end 131 and a second open end 132 corresponding to the first open end 131 . The first open end 131 is connected to the concentrating cavity 11 , and the second open end 132 is connected to the accommodating cavity 12 . In the first embodiment of the present invention, the light guiding portion 14 can be connected between the second open end 132 and the accommodating cavity 12, and the light guiding surface 141 of the light guiding portion 14 can be opposite to a horizontal axis HH (see 10 is inclined to a predetermined angle α between 30 degrees and 60 degrees (not shown), or the light guiding surface 141 of the light guiding portion 14 is inclined with respect to the surface of the light sensing unit 31. A predetermined angle α between 30 degrees and 60 degrees. Preferably, the predetermined angle α may be 45 degrees. In other words, the surface of the light sensing unit 31 and the horizontal axis HH are parallel to each other. In addition, preferably, the slot 15 is connectable between the light guiding portion 14 and the receiving cavity 12. As shown in FIG. 9, the slot 15 has a predetermined width W, and a predetermined height H is formed between the lower surface 134 adjacent to the second open end 132 and the light sensing unit 31, and the predetermined width W and the predetermined height H satisfy the following formula. :(0.8*W) ≦H≦(3*W), where H is a predetermined height H and W is a predetermined width W.

Further, a first predetermined distance L1 is formed between the upper surface 133 and the lower surface 134 adjacent to the first open end 131, and a second predetermined portion is adjacent between the upper surface 133 and the lower surface 134 adjacent to the second open end 132. Distance L2. In the embodiment of the present invention, in order to change the incident angle of the first reflected light T12 or the third reflected light T23 projected on the light sensing unit 31, the first predetermined distance L1 and the second predetermined distance L2 may be different. Preferably, the second predetermined distance L2 is greater than the first predetermined distance L1. Furthermore, the predetermined height H and the second predetermined distance L2 may conform to the following formula: (0.8*L2) ≦H ≦ (3*L2), where H is a predetermined height H and L2 is a second predetermined distance L2. In other words, the predetermined width W may be equal to the second predetermined distance L2.

Further, for example, in the first embodiment of the present invention, the cross-sectional area of the rectangular sampling cavity 13 (see FIGS. 15A to 15C) is greater than or equal to the sensing area of the light sensing unit 31. Furthermore, since the size of the current two-channel infrared light sensor is approximately 4 millimeters (millimeter, mm) * 2 millimeters (mm), the second predetermined distance L2 may be 2.1 millimeters (mm), and the predetermined width W may also be The size is equal to the second predetermined distance L2, but the invention is not limited thereto. In other embodiments, the size of the predetermined width W may also be between (1.1*L2) and (2.3*L2). The predetermined height H may be between 1 millimeter (mm) and 2 millimeters (mm), and more preferably may be 1.5 millimeters (mm), although the invention is not limited thereto.

Next, referring to FIGS. 10 to 12, the influence of the case where the first predetermined distance L1 and the second predetermined distance L2 are the same on the ray T, and the first predetermined distance L1 and the second predetermined distance L2 will be described below. The influence of the different conditions on the light T is hereinafter described by the first light (T1', T1". As shown in Fig. 10, it represents the same as the first predetermined distance L1 and the second predetermined distance L2. The first reflected light T12' generated by the reflection of the first projected light T11' through the first reflective structure 111 may have a first incident angle θ1, and the first incident angle θ1 is the first reflected light T12' and the sampling The angle between the lower surface 134 of the cavity 13. The first reflected light T12' is reflected by the interior of the sampling cavity 13, and then passes through the 45-degree light guide. After the surface 141 is reflected, a first light ray T1 ′ having a second incident angle θ2 and projected on the light sensing unit 31 can be formed, wherein the second incident angle θ2 is a vertical axis VV of the light sensing unit 31 (vertical light) The angle between the axis of the surface of the sensing unit 31 and the first light ray T1'. For example, since the first predetermined distance L1 and the second predetermined distance L2 are the same, that is, the upper surface 133 of the sampling cavity 13 is parallel to the lower surface 134, when the first incident angle θ1 is 23 degrees, The two incident angles θ2 are still 23 degrees.

Next, as shown in FIGS. 11 and 12, the first predetermined distance L1 and the second predetermined distance L2 are different, and the second predetermined distance L2 is greater than the first predetermined distance L1. Thereby, the lower surface 134 of the sampling chamber 13 and the horizontal axis HH have an angle β between 0.1 and 5 degrees. Preferably, in the first embodiment of the present invention, the angle β may be between 0.3 degrees and 3 degrees, more preferably 0.5 degrees, but the invention is not limited thereto. The first reflected light T12' generated by the first projected light ray T11' generated by the light-emitting unit 21 may have a first incident angle θ1', and the first reflected light T12' passes through the sampling cavity. After the internal reflection is reflected by the 45-degree light guiding surface 141, a first light ray T1" having a second incident angle θ2' and projected on the light sensing unit 31 can be formed. For example, The first predetermined distance L1 and the second predetermined distance L2 are different, that is, the upper surface 133 of the sampling cavity 13 is not parallel to the lower surface 134, so when the first incident angle θ1' is 23 degrees, the first light T1 "It will be affected by the angle β, so that the second incident angle θ2' becomes 18 degrees. Therefore, when the light sensing unit 31 is the same as the first predetermined distance L1 and the second predetermined distance L2, more infrared light of a set wavelength can be further received. In other words, the light T (the first light T1' and the second light T2) preferably enters the light sensing unit 31 vertically. In addition, it should be noted that the present invention does not take the incident angle of 20 degrees as a critical value, and 20 degrees is only an example. In other embodiments, different light sensing units 31 may have a better incident angle different from 20 degrees or less. .

Second embodiment

First, referring to FIG. 13 and FIG. 14, a second embodiment of the present invention provides a gas measuring device Q. As can be seen from a comparison between FIG. 13 to FIG. 14 and FIG. 10 to FIG. The maximum difference between the second embodiment and the first embodiment is that the cavity module 1 ′ provided by the second embodiment does not have the light guiding portion 14 and the slot 15 , but directly generates the light T generated by the light emitting unit 21 . Projected onto the light sensing unit 31. Preferably, the sampling cavity 13 can have a first open end 131', a second open end 132', an upper surface 133' and a lower surface 134'.

In the above, the first open end 131' has a first predetermined distance L1' between the upper surface 133' and the lower surface 134', and the upper surface 133' and the lower surface 134' of the second open end 132' have a The second predetermined distance L2'. As shown in FIG. 13, the first predetermined distance L1' and the second predetermined distance L2' may be the same, however, as shown in FIG. 14, in order to increase the infrared energy that the light sensing unit 31 can receive, the first predetermined The distance L1' and the second predetermined distance L2' may also be different as described in the foregoing first embodiment, and the first predetermined distance L1' and the second predetermined distance L2' may be greater than the first predetermined distance L1'. Thereby, the lower surface 134' of the sampling chamber 13' may have an included angle β' between 0.1 and 5 degrees with the horizontal axis HH.

In addition, it should be noted that the light-emitting module 2, the light sensing module 3, the concentrating cavity 11, the accommodating cavity 12, and the sampling cavity 13' provided by the second embodiment are the same as the first embodiment described above. The example is similar and will not be repeated here.

Third embodiment

First, referring to Figures 15A through 15C, other shapes of the sampling cavity 13 will be further illustrated in Figures 15A through 15C. For example, the foregoing rectangular shaped sampling cavity 13 can be as shown in FIG. 15A, but the invention is not limited thereto. In other words, the cross section of the cavity module 1" may also have a pentagonal cross section as shown in FIG. 15B, or the cross section of the cavity module 1"' may also be as shown in FIG. 15C. There is a cross section of a hexagon, that is, the cavity module (1, 1 ', 1", 1"') may have a polygonal shaped cross section. In addition, the first predetermined distance L1 and the second predetermined distance L2 of the cavity module (1", 1"') having a cross-section of a pentagonal shape or a hexagonal shape may be different (not shown in the drawing) That is, the areas of the cross sections of the first open end 131 and the second open end 132 are different.

It is worth noting that the cavity module 1 having a rectangular cross section is preferably Can be applied to dual-channel infrared light sensors (since the two infrared collection windows are rectangular). In addition, the cavity module (1", 1"" having a cross-section of a pentagonal shape or a hexagonal shape is preferably applicable to a single-channel infrared light sensor (due to a single-channel infrared light sensor) The infrared collecting window has a substantially circular shape or a square shape, and the infrared collecting window can be surrounded by a cavity module (1", 1"" having a cross section of a pentagonal shape or a hexagonal shape).

Further, the cavity module (1", 1"') provided by the third embodiment is similar to the previous embodiment, and will not be described again here. That is, the cavity module (1", 1' The inner surface of the '') may further be provided with a reflective layer to further superimpose the light sources T generated by the light-emitting module 2 in the sampling cavity 13 so that the superimposed light rays T can be evenly distributed.

Advantages of the embodiment

In summary, the gas measuring device Q provided by the embodiment of the present invention can utilize the “first reflective structure 111 having a first focus F1 and a second corresponding to the first focus F1. Focus F2, the second reflective structure 112 has a center point O, the first focus F1 and the center point O are corresponding to each other, and the "light-emitting unit 21 corresponds to the first focus F1 and the center point O", and the cavity is improved. Light collecting property of the body module (1, 1', 1", 1"'). At the same time, the first reflected light T11 and the third reflected light T23 are projected to the first of the sampling cavity (13, 13') The open end (131, 131') further reflects the first reflected light T11 and the third reflected light T23 in the sampling cavity (13, 13').

Further, by the concentrating cavity 11 composed of the elliptical curvature surface E and the perfect circular curvature surface C, respectively, the length of the sampling cavity (13, 13') can be greatly shortened, and at the same time, the first reflective structure 111 can also be passed. And the second reflective structure 112 condenses to increase the infrared energy projected by the light emitting unit. Furthermore, after the first reflected light T12 and the third reflected light T23 are projected onto the light guiding surface 141 having an angle of 45 degrees, the first reflected light T12 and the third reflected light T23 can be rotated by 45 degrees, and uniformly projected to the light sense. On the measuring unit 31.

In addition, by the technical feature that the second predetermined distance L2 is greater than the first predetermined distance L1, the incident angle of the light T (the first light T1 and the second light T2) projected to the light sensing module 3 can be changed (second Incident angle θ2) to improve measurement accuracy. In other words, the first incident angle θ1 originally greater than 20 degrees and the technical feature of the first predetermined distance L1 being greater than the first predetermined distance L1" may be caused by the sampling cavity 13 to be projected to the light sensing unit 31. The light is converted into a second angle of incidence (θ2, θ2') of less than 20 degrees.

Therefore, according to the above structure, the prior art can improve the problem that the infrared light cannot be efficiently projected onto the light sensing unit 31 due to assembly tolerance or vibration when the infrared light is concentrated on one point, and the cavity module can be improved. The light collection property of (1,1',1",1''').

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Therefore, all equivalents of the present invention are included in the scope of the present invention.

Q‧‧‧Gas measuring device

1‧‧‧ cavity module

1a‧‧‧Upper cavity module

1b‧‧‧ lower cavity module

11‧‧‧Concentrating cavity

111‧‧‧First reflection structure

112‧‧‧Second reflective structure

12‧‧‧ accommodating cavity

13‧‧‧Sampling chamber

135‧‧‧ gas diffusion tank

14‧‧‧Light Guide

16‧‧‧ gas filtration membrane

2‧‧‧Lighting module

21‧‧‧Lighting unit

22‧‧‧Connecting line

3‧‧‧Light sensing module

31‧‧‧Light sensing unit

32‧‧‧Connecting line

4‧‧‧Substrate module

K2‧‧‧ fixing hole

S‧‧‧Sampling space

Claims (10)

A gas measuring device includes: a cavity module, the cavity module includes a concentrating cavity, an accommodating cavity, and a concentrating cavity and the accommodating cavity a sampling cavity, wherein the concentrating cavity has a first reflective structure and a second reflective structure connected to the first reflective structure, the first reflective structure has a first focus and a corresponding The second reflective structure has a center point, the first focus and the center point are disposed corresponding to each other; and a light emitting module, the light emitting module is disposed at the second focus The illuminating cavity includes a light emitting unit, wherein the light emitting unit corresponds to the first focus and the center point; and a light sensing module, The light sensing module includes a light sensing unit, and the light sensing unit is disposed in the receiving cavity. The gas measuring device according to claim 1, wherein the first reflecting structure has an elliptical curvature curved surface, the second reflecting structure has a perfect circular curvature curved surface, and the light emitting unit is disposed at the first focus And the center point. The gas measuring device of claim 1, wherein the light ray comprises a first projected ray projected onto the first reflective structure and a second projected ray projected on the second reflective structure, The first projected light is reflected by the first reflective structure to form a first reflected light that is projected to the second focus, and the first projected light and the first reflected light cooperate to form a projection a first light incident on the light sensing unit, the second projected light is reflected by the second reflective structure to form a second reflected light projected onto the first reflective structure, the second Reflecting light is reflected by the first reflective structure to form a third reflected light that is projected to the second focus, the second projected light, the second reflected light, and the third reflected light Interworking to form a second light that is projected onto the light sensing unit. The gas measuring device of claim 1, wherein the sampling cavity has an upper surface and a lower surface, the sampling cavity has a first open end and a second corresponding to the first open end An open end, the first open end is connected to the concentrating cavity, and the second open end is connected to the accommodating cavity, between the upper surface and the lower surface of the first open end Having a first predetermined distance, a second predetermined distance between the upper surface and the lower surface of the second open end, the second predetermined distance being greater than the first predetermined distance. The gas measuring device of claim 4, wherein the cavity module further comprises a light guiding portion disposed between the sampling cavity and the receiving cavity, adjacent to the first The lower surface of the two open ends and the photo sensing unit have a predetermined height, and the predetermined height and the second predetermined distance conform to the following formula: (0.8*L2) ≦H≦(3*L2), Where H is the predetermined height and L2 is the second predetermined distance. The gas measuring device of claim 1, wherein the cavity module further comprises a light guiding portion disposed between the sampling cavity and the accommodating cavity, the light guiding portion There is a light guiding surface that is inclined with respect to a horizontal axis by a predetermined angle between 30 degrees and 60 degrees. The gas measuring device of claim 1, wherein the cavity module further comprises a light guiding portion disposed between the sampling cavity and the accommodating cavity, and a slot. The slot is connected between the light guiding portion and the receiving cavity, the sampling cavity has an upper surface and a lower surface, the slot has a predetermined width, and the sampling cavity is The lower surface and the light sensing unit have a predetermined height, and the predetermined width and the predetermined height conform to the following formula: (0.8*W) ≦H ≦ (3*W), where H is the predetermined height , W is the predetermined width. The gas measuring device according to claim 1, wherein the sampling chamber further has a gas diffusion groove, and the gas diffusion groove is disposed at the first open end And between the second open ends. The gas measuring device of claim 1, wherein the light emitting module is an infrared light emitting device, and the light sensing module is an infrared light sensor. The gas measuring device according to claim 1, wherein a cross section of the sampling chamber is a rectangular shape, a pentagon shape or a hexagonal shape.