Detection box for reducing abnormal influence of external light source

Abstract

The utility model discloses a detection box for reducing abnormal influence of an external light source, which comprises a box body, a light path channel is arranged in the box body, two ends of the light path channel are respectively provided with a transmitting unit and a receiving unit, the box body is provided with an air channel capable of feeding and discharging air, and the box body is provided with openings at two sides of the air channel. The opening is provided with a protruding rib, and the extending direction of the protruding rib is perpendicular to the light path channel. The utility model provides the detection box capable of reducing the abnormal influence of the external light source, the scattered electric signals of the external light source can be shielded, and the influence of the outside on the abnormal internal light path is reduced, so that the value of the electric signals received by the receiving unit in the box body is normal and regular, and the qualified rate is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to dust detection technical field especially relates to a detection box that reduces external light source abnormal influence. BACKGROUND

[0002] With the development of science and technology and the increase of people's environmental protection consciousness, the popularization rate of air purifiers, air conditioners and fresh air systems is increasing, and people are more and more concerned about how to quickly, effectively and accurately detect the dust PM2.5 content in the air. The research and promotion of this problem have great significance.

[0003] For example, the publication number "CN217006879U" discloses "dust detector based on laser scattering", which includes a shell, a first air duct is opened in the inside of the shell, a second air duct is opened in the inside of the shell near the upper part of the first air duct, a gas pump is installed in the inside of the second air duct, a single-chip microcomputer is installed in the inside top of the shell, and a silicon photocell is installed on one side of the single-chip microcomputer, a gas pump is installed in the inside of the second air duct, a protection device is installed in the inside of the first air duct, the protection device includes a mounting bracket, a first protection cover and a second protection cover installed on the mounting bracket. However, in actual application, such detection device will cause the stray light in the external light path to affect the internal diode, resulting in abnormal detection data, which requires a large amount of resources for processing and separation. SUMMARY

[0004] In view of the problem that the existing technology mentioned in the background art is affected by external stray light, the utility model provides a detection box that reduces the abnormal influence of external light source, which can block the scattered electric signals of external light source, reduce the abnormal influence of external light path on the internal light path, and make the electric signal value received by the receiving unit in the box body normal and regular, thereby improving the qualified rate.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions.

[0006] The application discloses a detection box capable of reducing the abnormal influence of external light sources, which comprises a box body, a light path channel arranged in the box body, an emitting unit and a receiving unit arranged at two ends of the light path channel respectively, an air duct capable of allowing air to enter and exit arranged on the box body, and openings arranged on two sides of the air duct, wherein raised ribs are arranged on the openings, and the extension direction of the raised ribs is perpendicular to the light path channel. In the application, the light path channel and the air duct are arranged on the box body, the arrangement directions of the light path channel and the air duct are perpendicular, the openings are arranged on the two sides of the air duct, and the raised ribs are arranged on the openings. Since the openings are arranged on the air duct, the external light sources can enter the inside of the box body through the openings during use. Since the external light sources can scatter in the process of propagation, the direction of the scattered light can deviate from the extension direction of the air duct, and thus the scattered light of the external light sources can interfere with the emitting unit and the receiving unit in the inside. In order to solve the above problem, the raised ribs are arranged on the openings, the light entering the box body can propagate along the diffraction direction of the raised ribs, and the remaining scattered light is blocked by the raised ribs, so that the scattered light is prevented from diffusing towards the emitting unit and the receiving unit and affecting the detection result. In the application, the emitting unit is an infrared diode, and the receiving unit is a photodiode. There are generally two openings arranged on the air duct, which are located at two ends of the air duct (a plurality of air inlet openings and a plurality of air outlet openings can also be arranged according to actual needs). The raised ribs are arranged on the openings. Since the openings are directly connected with the external environment, the raised ribs arranged on the openings can reduce the influence of external light on the inside. In actual use, the raised ribs can be arranged according to the positional relationship between the openings and the external environment. For example, when the air inlet opening or the air outlet opening is far away from the external environment, the raised ribs can not be arranged or the size of the raised ribs can be reduced, and the raised ribs can be arranged only at the opening close to the external environment. If all the openings are close to the external environment, the raised ribs can be arranged on all the openings, so that the detection accuracy is ensured.

[0007] Preferably, the light path channel comprises a placing unit, and the emitting unit and the receiving unit are detachably connected with the placing unit. The placing unit is arranged on the light path channel, the receiving unit and the placing unit are placed in the placing unit, and the emitting unit and the receiving unit are detachably connected with the placing unit, so that the maintenance of the installation in the later period is facilitated. The detachable connection includes, but is not limited to, clamping connection, plug connection, bolt connection and the like.

[0008] As preferred, the placing unit comprises a transmitting placing part and a receiving placing part, the transmitting unit is arranged in the transmitting placing part, the receiving unit is arranged in the receiving placing part, and the opening is arranged between the transmitting placing part and the receiving placing part. The placing unit comprises the transmitting placing part and the receiving placing part, and the opening is arranged between the transmitting placing part and the receiving placing part, so that the light entering the opening can irradiate between the transmitting placing part and the receiving placing part, and the dust is detected.

[0009] As preferred, a plurality of extension plates are arranged in the box body, and a refractive sharp corner is arranged at the end of each extension plate. The plurality of extension plates are arranged in the box body, and the refractive sharp corners arranged at the ends of the extension plates can reasonably refract the light in the box body, so that the light in the box body cannot cause excessive interference to the receiving unit.

[0010] As preferred, an offset angle is arranged between the transmitting unit and the receiving unit.

[0011] As preferred, a plurality of lenses are arranged on the light path channel between the transmitting unit and the receiving unit, and the lenses are arranged on both sides of the opening. The lenses are arranged on the light path channel, and the lenses can condense light and control the light.

[0012] As preferred, a plurality of placing plates are arranged on the light path channel, the lenses are detachably connected between adjacent placing plates, and a light passing groove is arranged on each placing plate. The plurality of placing plates are arranged on the light path channel, the lenses are arranged in the gaps between the placing plates, the placing plates are arranged in plurality, so that the lenses can be placed at appropriate positions according to the requirements, the flexibility of adjustment is improved, and the light passing groove is arranged on each placing plate, the light emission can be guided through the light passing groove, and the interference caused by the light divergence is avoided.

[0013] As preferred, the box body comprises an upper cover and a lower cover, an air inlet is arranged on the upper cover, an air outlet is arranged on the lower cover, a circuit board and a shielding cover are connected to the upper cover. The opening comprises the air inlet and the air outlet, the box body comprises the upper cover and the lower cover, the air inlet is arranged on the upper cover, the air outlet is arranged on the lower cover, the protruding ribs can be arranged on the air inlet and the air outlet when actually needed, that is, the protruding ribs are arranged on the upper cover and the lower cover, the air inlet and the air outlet are arranged in alignment, the circuit board is arranged on the upper cover, the shielding cover arranged on the circuit board can shield the interference of external signals to the circuit board, and the detection accuracy is improved.

[0014] As preferred, the convex ribs are arranged on the side of the air outlet facing the air inlet, the convex ribs are arranged on the side of the air inlet away from the air outlet, and the convex ribs on the air inlet are connected with the circuit board and the shielding cover. The convex ribs arranged on the air outlet are arranged on the side facing the air inlet, and the convex ribs arranged on the air inlet are arranged on the side away from the air outlet. Since the air inlet is arranged on the upper cover, and the circuit board and the shielding cover are also connected to the upper cover, the structure size of the upper cover is thicker. The convex ribs on the air inlet can connect the circuit board and the shielding cover, ensure the stability of the connection, and the light from the air inlet enters the shielding cover first, so that the convex ribs on the air inlet can shield the dispersion of the light during the process of entering the air inlet from the shielding cover, thereby improving the detection accuracy. The convex ribs arranged on the lower cover are arranged on the side facing the air inlet, which can ensure the flatness of the bottom surface of the lower cover, reduce the dispersion of light in the light path channel, and control the interference between the convex ribs and the light path channel, thereby ensuring the detection accuracy.

[0015] As preferred, the opening is a circular opening, and the convex rib is an annular plate.

[0016] The beneficial effects of the utility model are as follows:

[0017] (1) The external light source dispersed electric signal can be shielded, the influence of the external light on the internal light path is reduced, the electric signal value received by the receiving unit in the box body is normal and regular, and the qualified rate is improved.

[0018] (2) The placing flexibility of the lens in the box body is improved, the box body can adapt to lenses of various sizes, and the adaptability is improved.

[0019] (3) The influence of the refraction in the box body on the receiving unit is reduced, and the detection accuracy is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a partial explosion view of the utility model.

[0021] Figure 2 It is a whole explosion view of the utility model.

[0022] Figure 3 It is an axonometric view of the lower cover in the utility model.

[0023] Figure 4 It is a principle diagram of the utility model.

[0024] In the drawing:

[0025] 1. Box body, 11. Transmitting unit, 12. Receiving unit, 13. Placement unit, 131. Transmitting placement part, 132. Receiving placement part, 14. Extension plate, 141. Refraction sharp corner, 15. Lens, 16. Placement plate, 161. Light passage groove, 17. Optical path channel.

[0026] 2 openings, 21 protruding tendons and bones;

[0027] 3. Top cover, 31. Air inlet;

[0028] 4 bottom covers, 41 air outlets;

[0029] 5 circuit boards;

[0030] 6. Shielding cover. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0032] Example 1:

[0033] like Figure 1 , 4 As shown, a detection box for reducing the influence of abnormal external light sources includes a box body 1, an optical path channel 17 disposed inside the box body 1, a transmitting unit 11 and a receiving unit 12 respectively disposed at both ends of the optical path channel 17, an air duct for air intake and exhaust on the box body 1, and openings 2 on both sides of the air duct on the box body 1, with protruding ribs 21 disposed on the openings 2, the extension direction of the protruding ribs 21 being perpendicular to the optical path channel 17; in this embodiment, there are two openings 2 on the air duct, and protruding ribs 21 are disposed on both openings 2. Since the detection box is generally designed as a separate unit for easy installation, therefore... Figure 1 In the figure, the two openings 2 and the corresponding protruding ribs 21 on the two openings 2 are located on the upper and lower sub-units of the box body, respectively. The upper and lower sub-units are both represented by the box body 1.

[0034] In recent years, with population growth and rapid industrial development, industrial emissions of waste gas and waste have increased significantly, causing increasingly serious damage to humans and the environment. The concentration of dust in the air has increased, and dust floating in the air can attract other harmful substances, leading to severe air pollution, reduced visibility, and the formation of smog. Inhalation of this dust can cause various diseases. With technological advancements and increased environmental awareness, the use of air purifiers, air conditioners, and fresh air systems has become more widespread. People are increasingly concerned about how to quickly, effectively, and accurately detect the PM2.5 concentration in the air. Research and promotion of methods for addressing this issue are of great significance.

[0035] The mainstream dust detection device in the prior art generally adopts an open optical path design and a direct irradiation type architecture, but such a device will expose problems affecting the measurement accuracy in actual work. Specifically, the blocking ability of the box body 1 to external stray light is insufficient, which causes the stray light of the unplanned optical path to invade the interference detection system, thereby reducing the accuracy of signal acquisition. The traditional detection box is configured with a basic light shielding structure, but under complex lighting conditions, part of the stray light can still penetrate into the optical path detection system through the air inlet 31 and the air outlet 41. Since the emission direction of the stray light is not concentrated, when the stray light enters the inside of the box body 1, the stray light will have multiple optical effects such as reflection and refraction with the cavity wall material, thereby interfering with the detection components. The propagation path of such interference light and the main detection light beam are misaligned, which can be captured by the photodiode, resulting in serious interference of the detection signal.

[0036] In the present application, the optical path channel 17 and the air duct are arranged on the box body 1, wherein the arrangement direction of the optical path channel 17 and the air duct is vertical, and the air duct is provided with openings 2 on both sides, wherein the openings 2 are provided with protruding ribs 21. Since the air duct is provided with openings 2, during use, external light sources will enter the inside of the box body 1 through the openings 2. Since the external light sources will produce part of the scattered light during propagation, and the direction of the scattered light will deviate from the extension direction of the air duct, the stray light of the external light sources will interfere with the internal emission unit 11 and the receiving unit 12. In view of the above problem, the protruding ribs 21 are arranged at the position of the opening 2 in the present application, which can make the light entering the box body 1 propagate along the diffraction direction of the protruding ribs 21, and the remaining stray light is blocked by the protruding ribs 21, avoiding the stray light from being scattered towards the emission unit 11 and the receiving unit 12, thereby affecting the detection result. In the present application, the emission unit 11 is an infrared diode, and the receiving unit 12 is a photodiode.

[0037] Embodiment 2:

[0038] As Figure 1 , 4As shown in the figure, a detection box for reducing the abnormal influence of external light source comprises a box body 1, a light path channel 17 is arranged in the box body 1, an emitting unit 11 and a receiving unit 12 are arranged at both ends of the light path channel 17 respectively, an air duct capable of air inlet and outlet is arranged on the box body 1, the box body 1 is provided with openings 2 on both sides of the air duct, the openings 2 are provided with raised ribs 21, and the extension direction of the raised ribs 21 is perpendicular to the light path channel 17. In the application, the raised ribs 21 are arranged at the positions of the openings 2, so that the light entering the box body 1 can propagate along the diffraction direction of the raised ribs 21, and the remaining stray light is blocked by the raised ribs 21, avoiding the stray light from being diffused towards the emitting unit 11 and the receiving unit 12, thereby affecting the detection result. In the application, the emitting unit 11 is an infrared diode, and the receiving unit 12 is a photodiode.

[0039] As shown in the figure, Figure 2 , 3 As shown in the figure, the box body 1 comprises an upper cover 3 and a lower cover 4, an air inlet 31 is arranged on the upper cover 3, an air outlet 41 is arranged on the lower cover 4, and a circuit board 5 and a shielding cover 6 are connected to the upper cover 3. The box body 1 comprises the upper cover 3 and the lower cover 4, the air inlet 31 is arranged on the upper cover 3, and the air outlet 41 is arranged on the lower cover 4, wherein the air inlet 31 and the air outlet 41 are arranged in alignment, the circuit board 5 is arranged on the upper cover 3, and the shielding cover 6 arranged on the circuit board 5 can interfere with the external signal to the circuit board 5, thereby improving the accuracy of detection; in the embodiment, the air duct is provided with openings 2 at both ends, the openings 2 in the embodiment are provided with two, the box body 1 in the embodiment is divided into the upper cover 3 and the lower cover 4, and the two openings 2 are arranged on the upper cover 3 and the lower cover 4 respectively, wherein the opening 2 on the upper cover 3 is the air inlet 31, and the opening 2 on the lower cover 4 is the air outlet 41, and the raised ribs 21 are arranged on both openings 2, that is, the air inlet 31 and the air outlet 41 in the embodiment are provided with the raised ribs 21, and since the shapes are similar, the raised ribs 21 are arranged in the embodiment and the following embodiments, and the raised ribs 21 arranged on the air outlet 41 / air inlet 31 are distinguished in position in the following.

[0040] As shown in the figure, Figure 2 , 3As shown, the raised ribs 21 are arranged on the side of the air outlet 41 facing the air inlet 31, the raised ribs 21 are arranged on the side of the air inlet 31 away from the air outlet 41, and the raised ribs 21 on the air inlet 31 are connected to the circuit board 5 and the shielding cover 6. The raised ribs 21 arranged on the air outlet 41 are arranged on the side facing the air inlet 31, and the raised ribs 21 arranged on the air inlet 31 are arranged on the side away from the air outlet 41. Since the air inlet 31 is arranged on the upper cover 3, and the circuit board 5 and the shielding cover 6 are also connected to the upper cover 3, the structure size of the upper cover 3 is thicker. The raised ribs 21 on the air inlet 31 can connect the circuit board 5 and the shielding cover 6, ensure the stability of the connection, and the light from the air inlet 31 first passes through the hole in the shielding cover 6, so that the light passing through the shielding cover 6 and entering the air inlet 31 is blocked by the raised ribs 21 on the air inlet 31, thereby improving the detection accuracy. The raised ribs 21 arranged on the lower cover 4 are arranged on the side facing the air inlet 31, which can ensure the flatness of the bottom surface of the lower cover 4, reduce the divergence of light in the light path channel 17, and control the interference between the raised ribs 21 and the light path channel 17, thereby ensuring the accuracy of detection.

[0041] As shown in Figure 2 , 3 , the opening 2 is a circular opening, and the raised ribs 21 are annular plates. The opening is arranged as a circular opening, so that the air inlet is more uniform, and the raised ribs 21 are arranged as annular plates. Due to the annular structure of the raised ribs 21, the light can be blocked in all directions, ensuring the uniformity of the light blocking, and avoiding light leakage and refraction out of the preset range.

[0042] Embodiment 3:

[0043] As shown in Figure 1 , a detection box for reducing the abnormal influence of external light sources includes a box body 1, a light path channel 17 is arranged in the box body 1, an emitting unit 11 and a receiving unit 12 are arranged at both ends of the light path channel 17, and an air duct is arranged on the box body 1 to allow air to enter and exit. The box body 1 is provided with an opening 2 on both sides of the air duct, the opening 2 is provided with raised ribs 21, and the extension direction of the raised ribs 21 is perpendicular to the light path channel 17. In the present application, the raised ribs 21 are arranged at the position of the opening 2. The light entering the box body 1 can propagate along the diffraction direction of the raised ribs 21, and the remaining stray light is blocked by the raised ribs 21 to avoid the stray light from diverging towards the emitting unit 11 and the receiving unit 12, thereby affecting the detection result. In the present application, the emitting unit 11 is an infrared diode, and the receiving unit 12 is a photodiode.

[0044] As shown in Figure 2 , 3As shown, the light path channel 17 includes a placement unit 13, the emission unit 11 and the receiving unit 12 are detachably connected with the placement unit 13. The light path channel 17 is provided with the placement unit 13, wherein the placement unit 13 can place the receiving unit 12 and the placement unit 13, and the emission unit 11 and the receiving unit 12 are detachably connected with the placement unit 13, so as to facilitate the installation of the later maintenance, wherein the detachable connection includes but is not limited to snap connection, plug-in, bolt connection and the like.

[0045] As shown in Figure 2 , the placement unit 13 includes an emission placement part 131 and a receiving placement part 132, the emission unit 11 is arranged in the emission placement part 131, and the receiving unit 12 is placed in the receiving placement part 132, and the opening 2 is arranged between the emission placement part 131 and the receiving placement part 132. The placement unit 13 includes the emission placement part 131 and the receiving placement part 132, wherein the opening 2 is arranged between the emission placement part 131 and the receiving placement part 132, so that the light entering the opening 2 can be irradiated between the emission placement part 131 and the receiving placement part 132, and then the dust is detected.

[0046] As shown in Figure 3 , a plurality of extension plates 14 are arranged in the box body 1, and the extension plates 14 are provided with refractive sharp corners 141 at the ends. A plurality of extension plates 14 are arranged in the box body 1, and the refractive sharp corners 141 arranged at the ends of the extension plates 14 can reasonably refract the internal light, so that the internal light can not cause excessive interference to the receiving unit 12.

[0047] As shown in Figure 3 , the emission unit 11 and the receiving unit 12 are provided with an offset included angle.

[0048] As shown in Figure 2 , 4 , a plurality of lenses 15 are arranged on the light path channel 17 between the emission unit 11 and the receiving unit 12, and the lenses 15 are located on both sides of the opening 2. The lenses 15 are arranged on the light path channel 17, and the lenses 15 can condense light and control light at the same time.

[0049] As shown in Figure 3As shown, the light path channel 17 is provided with a plurality of placement plates 16, the lens 15 is detachably connected between adjacent placement plates 16, and the placement plate 16 is provided with a light passing groove 161. The light path channel 17 is provided with a plurality of placement plates 16, and a gap is provided between each placement plate 16. The lens 15 can be placed in the gap. Since the placement plate 16 is provided with a plurality of placement plates 16, the lens 15 can be placed at the appropriate position according to the use requirements, improving the flexibility of adjustment. The light passing groove 161 is provided on the placement plate 16, and the light passing groove 161 can guide the emission of light, avoiding interference caused by light dispersion.

[0050] As shown in Figure 2 , 3 , the box body 1 includes an upper cover 3 and a lower cover 4. The upper cover 3 is provided with an air inlet 31, and the lower cover 4 is provided with an air outlet 41. The upper cover 3 is connected with a circuit board 5 and a shielding cover 6. The box body 1 includes an upper cover 3 and a lower cover 4. The air inlet 31 is provided on the upper cover 3, and the air outlet 41 is provided on the lower cover 4. The air inlet 31 and the air outlet 41 are aligned. The circuit board 5 is provided on the upper cover 3. The shielding cover 6 provided on the circuit board 5 can shield the interference of external signals on the circuit board 5, improving the accuracy of detection.

[0051] As shown in Figure 3 , the protruding ribs 21 are provided on one side of the air outlet 41 facing the air inlet 31. The protruding ribs 21 are provided on the side of the air inlet 31 away from the air outlet 41. The protruding ribs 21 on the air inlet 31 are connected with the circuit board 5 and the shielding cover 6. The protruding ribs 21 provided on the air outlet 41 are provided on the side facing the air inlet 31, and the protruding ribs 21 on the air inlet 31 are provided on the side away from the air outlet 41. Since the air inlet 31 is provided on the upper cover 3, and the upper cover 3 is also connected with the circuit board 5 and the shielding cover 6, the structure size of the upper cover 3 is thicker. The protruding ribs 21 on the air inlet 31 can connect the circuit board 5 and the shielding cover 6, ensuring the stability of the connection. At the same time, when external light enters from the air inlet 31, it will first pass through the hole of the shielding cover 6. Therefore, during the process of entering the air inlet 31 from the shielding cover 6, the protruding ribs 21 on the air inlet 31 can shield the astigmatism of the light, thereby improving the detection accuracy. The protruding ribs 21 provided on the lower cover 4 are provided on the side facing the air inlet 31, which can ensure the flatness of the bottom surface of the lower cover 4, and can reduce the dispersion of light on the light path channel 17. At the same time, the protruding ribs 21 need to be controlled not to interfere with the light path channel 17, thereby ensuring the accuracy of detection.

[0052] As shown in Figure 3 , the opening 2 is a circular opening, and the protruding ribs 21 are annular plates.

Claims

1. A test cartridge for reducing the effect of extraneous light sources, characterized in that, The box body is internally provided with a light path channel, the light path channel is provided with a transmitting unit and a receiving unit at two ends respectively, the box body is provided with an air duct capable of air inlet and outlet, the box body is provided with an opening at two sides of the air duct, the opening is provided with a raised rib, and the extension direction of the raised rib is perpendicular to the light path channel.

2. The test cartridge of claim 1, wherein the light source is a light emitting diode. The light path channel comprises a placing unit, and the transmitting unit and the receiving unit are detachably connected with the placing unit.

3. The cartridge of claim 2, wherein the cartridge is configured to reduce the effect of ambient light. The placing unit comprises a transmitting placing part and a receiving placing part, the transmitting unit is arranged in the transmitting placing part, the receiving unit is arranged in the receiving placing part, and the opening is arranged between the transmitting placing part and the receiving placing part.

4. The cartridge of claim 1, wherein the cartridge is configured to reduce the effects of ambient light. A plurality of extension plates are arranged in the box body, and the extension plates are provided with refractive sharp corners at end portions.

5. The cartridge of claim 1, wherein the cartridge is configured to reduce the effects of ambient light. An offset included angle is arranged between the transmitting unit and the receiving unit.

6. The cartridge of claim 1, wherein the cartridge is configured to reduce the effects of ambient light. A plurality of lenses are arranged on the light path channel and located between the transmitting unit and the receiving unit, and the lenses are located at two sides of the opening.

7. The cartridge of claim 6, wherein the cartridge is configured to reduce the effect of ambient light. A plurality of placing plates are arranged on the light path channel, the lenses are detachably connected between adjacent placing plates, and the placing plates are provided with light passing grooves.

8. The cartridge of any one of claims 1-7, wherein the cartridge is configured to reduce the effect of an external light source on the detection of the analyte. 5 The box body comprises an upper cover and a lower cover, the upper cover is provided with an air inlet, the lower cover is provided with an air outlet, and the upper cover is connected with a circuit board and a shielding cover.

9. The cartridge of claim 8, wherein the cartridge is configured to reduce the effect of ambient light. The raised rib is arranged on one side of the air outlet facing the air inlet, the raised rib is arranged on one side of the air inlet away from the air outlet, and the raised rib on the air inlet is connected with the circuit board and the shielding cover.

10. The cartridge of any one of claims 1-7, wherein the cartridge is configured to reduce the effect of an external light source on the detection of the analyte. 10 The opening is a circular opening, and the raised rib is an annular plate.

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