Light shield of optical monitoring sensor

Abstract

The utility model provides a light shield of an optical monitoring sensor, which belongs to the field of fluorescent sensor accessories and comprises a bubble removal overflow port, an instrument fixing port, extinction threads, a first water inlet overflow port, a second water inlet overflow port and a third water inlet overflow port. The bubble removal overflow port is composed of a bubble inlet, a bubble flow guide groove, a flow corner arc port and a bubble discharge port, the bubble inlet is in a large-chamfer design, the bubble flow guide groove is in an isotropic circumferential arc design, the flow corner arc port is arranged between the bubble flow guide groove and the bubble inlet and the bubble discharge port, and the flow corner arc port is arranged between the bubble flow guide groove and the bubble discharge port. The bubble inlet and the bubble outlet are designed to have an opposite included angle, and the bubble discharge overflow ports are uniformly distributed along the circumference. According to the utility model, the installation steps and possible connection gaps are reduced in terms of integral design, the stability and reliability of the shading effect are improved, and the reduction of the shading performance caused by improper installation is avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of fluorescence sensor accessories, relates to an optical monitoring sensor light shield. BACKGROUND

[0002] In the field of modern detection technology, fluorescence sensors are widely used, which work by detecting the fluorescence signals generated by the target substance. However, in practical applications, there are challenges. The source of natural light and artificial light is complex and the intensity is variable. The wavelength of the fluorescence signal is similar or overlapping, which causes serious interference, making it difficult for the sensor to accurately capture and distinguish the signal. The measurement accuracy and reliability are greatly reduced, especially when detecting low-concentration fluorescence substances. Weak signals are easily covered. In addition, unstable factors such as air flow and temperature changes also affect detection. In addition, some optical components of the sensor are sensitive to light and are easily damaged under strong light. The light shield can reduce interference, protect components, and ensure the continuous, stable, and accurate operation of the sensor.

[0003] In actual measurement scenarios, because the measurement window of the light shield is in a limited space of a certain size, when the excitation light of a certain wavelength irradiates the water sample, the water particles and the wall surface of the light shield will cause light scattering and reflection, thereby causing background light interference problems. In addition, the sensor with a light shield is easy to produce bubbles on the surface of the light window after entering the water. The existence of such bubbles will affect the measurement results.

[0004] At present, most in-situ optical monitoring instruments are mainly used in shipborne monitoring, fixed station monitoring, and fixed underwater glider monitoring scenarios. In this case, the sealed light shield needs to have good water exchange performance, and there should be no water residue in the light shield when the instrument is recovered from the water.

[0005] However, the existing optical light shield still cannot meet the following requirements: (1) light shielding; (2) water exchange; (3) bubble discharge; (4) no residue; (5) eliminate most of the excitation light background interference. Utility model content

[0006] To solve the above problems, the utility model provides an optical monitoring sensor light shield, which forms a sealed cabin to avoid natural light from the outside environment, and through various structure optimization designs, it can realize fast water exchange, bubble discharge, elimination of most excitation light background interference, and fast overflow of water flow without residue in the light shield under the premise of ensuring the light shielding of the light shield.

[0007] The utility model discloses a specific technical scheme for an optical monitoring sensor light shield, which is a cabin structure with a closed circular arc top and an open bottom.

[0008] The bubble removal overflow port is composed of a bubble inlet, a bubble flow guide groove, a flow corner arc port, and a bubble outlet. The bubble inlet is designed with a greater than 90-degree cutting angle. The bubble flow guide groove is designed with an isotropic circular arc. The flow corner arc port is arranged between the bubble flow guide groove and the bubble inlet and the bubble outlet. The bubble inlet and the bubble outlet are designed with an opposite included angle. The bubble removal overflow port is uniformly distributed along the circumference on the end face of the light shield.

[0009] The instrument fixing port is composed of a fixed end face, a fixed screw storage port, and a mounting port. The mounting port is uniformly distributed along the circumference on the end face of the light shield. The screw is inserted into the fixed end face inlet and fixed with the threaded port of the light window section. The installed screw is placed in the fixed screw storage port.

[0010] The light extinction thread is composed of a series of equidistant spiral upward trapezoidal threads arranged on the groove wall of the light shield.

[0011] The first water inlet overflow port is composed of a first water inlet, a first water flow guide groove, a flow corner arc, and a first water outlet. The first water flow guide groove is designed with an isotropic circular arc. The flow corner arc is arranged between the first water flow guide groove and the first water inlet and the first water outlet.

[0012] The second water inlet overflow port is composed of a second water inlet, a second water flow guide groove, and a second water outlet. The second water flow guide groove is designed with an S shape.

[0013] The third water inlet overflow port is composed of a third water inlet, a third water flow guide groove, and a third water outlet. The third water flow guide groove is designed with an S shape. The circular arc near the third water outlet is designed as a convex type.

[0014] The utility model has the advantages of:

[0015] 1. Structural optimization: (1) The flow guide groove structure is optimized to make the light shield have light shielding performance, water sample exchange, and bubble removal compatibility. (2) The convex arc design near the water outlet 6-3 ensures that the water and silt in the light shield are not left over during drainage. (3) The design of the light extinction thread eliminates the background interference of the excitation light through refraction, reflection, and interference. (4) The overall integrated design reduces the installation steps and possible connection gaps, improves the stability and reliability of the light shielding effect, and avoids the decline in light shielding performance caused by improper installation.

[0016] 2. Material: the light weight and high strength resin material, such as nylon and ABS photosensitive resin, can reduce the weight of the light shield, facilitate the operator to carry, and ensure the stability and durability of the light shield in various harsh environments, and is not easy to deform or damage.

[0017] 3. Improvement: the form and size of the water inlet are reasonably designed to ensure the water exchange and have coarse filtering function, which can effectively prevent weeds and sundries from entering the detection area and avoid abnormal detection value. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 Fig. 1 is a structural schematic view of the light shield of the present application;

[0019] Figure 2 Fig. 2 is a structural front view of the light shield of the present application;

[0020] Figure 3 Fig. 3 is a structural A-A sectional view of the light shield of the present application;

[0021] Figure 4 Fig. 4 is a structural B-B sectional view of the light shield of the present application;

[0022] Figure 5 Fig. 5 is a structural C-C sectional view of the light shield of the present application;

[0023] Figure 6 Fig. 6 is a deep-sea profile chlorophyll concentration measurement.

[0024] In the drawing, the reference signs are: bubble removal overflow port 1, instrument fixing port 2, light extinction thread 3, first water inlet overflow port 4, second water inlet overflow port 5, third water inlet overflow port 6, bubble discharge port 1-1, bubble flow guiding groove 1-2, flow turning corner arc port 1-3, bubble inlet 1-4, fixed end surface 2-1, fixed screw storage port 2-2, mounting port 2-3, first water inlet 4-1, first water flow guiding groove 4-2, flow turning corner arc 4-3, first water outlet 4-4, second water inlet 5-1, second water flow guiding groove 5-2, second water outlet 5-3, third water inlet 6-1, third water flow guiding groove 6-2, and third water outlet 6-3. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the present application more clear and understandable, the present application will be further described in detail below with reference to the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and not to limit the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other. In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme.

[0026] The utility model provides a kind of optical monitoring sensor light shield, as shown in Figures 1-5 It is avoided that outside environment natural light goes in to form closed cabin by forming a closed cabin mode, and under the premise of guaranteeing light shield light shielding property, water flow rapid exchange, bubble rapid discharge, elimination most excitation light background interference and take out water flow rapid overflow not residual in light shield can be realized.

[0027] As Figure 1 , Figure 2 As shown in, the light shield is cabin structure, the top of cabin structure is closed circular arc surface, the bottom of cabin structure is open design, bubble exclusion overflow port 1, instrument fixed mouth 2, light extinction thread 3, first, second, third water inlet overflow port 4, 5, 6 are arranged on cabin.

[0028] As Figure 3 (a) (b) shown, the bubble exclusion overflow port 1 is composed of bubble inlet 1-4, bubble flow guide groove 1-2, flow corner arc mouth 1-3, bubble discharge port 1-1, the bubble exclusion overflow port 1 is uniformly distributed on 4 circumferences of light shield end face, bubble inlet 1-4 is greater than 90 degree cutting angle design, can expand the contact area of interior with bubble as far as possible, so that bubble is rapidly discharged.Flow corner arc mouth 1-3 is equidirectional circumferential arc design, which is convenient for bubble flow, and the flow corner arc mouth 1-3 design is avoided in bubble flow guide groove 1-2 and bubble inlet 1-4 and bubble discharge port 1-1 to make corner so that silt particle does not remain and block bubble exclusion overflow port 1.while guaranteeing light shielding effect without affecting bubble exclusion, bubble inlet 1-4 and bubble discharge port 1-1 are designed to be opposite angle, the angle range is controlled between 20 °-30 ° (specifically can be adjusted according to the diameter size of light shield).Considering the convenience of light shield installation, according to the installation position of instrument fixed mouth 2, finally design bubble exclusion overflow port 1 along the circumferential four uniform openings.

[0029] As Figure 3 (a) shown, the instrument fixed mouth 2 is composed of fixed end face 2-1, fixed screw storage port 2-2, mounting port 2-3, instrument fixed mouth 2 is uniformly distributed on 4 circumferences of light shield end face, long screw is inserted into fixed end face 2-1 entrance by mounting port 2-3 so as to be fixed with the thread port of light window section, for the convenience of internal hexagonal screw installation, chamfer design is carried out in mounting port 2-3, and the screw after installation is placed in fixed screw storage port 2-2, and considering the installation stability, the thickness of fixed end face is more than 5 mm.

[0030] The light extinction thread 3 is composed of a series of equidistant spiral upward trapezoidal threads on the inner groove wall surface of the light shield, about 50mm from the end surface downward. Through this design, when light shines on this structure, part of the light is reflected and refracted at the trapezoidal thread and the circumferential groove, and another part of the light directly transmits through the installation port 2-3 or interferes between the grooves to cause the light in certain directions to cancel each other out. Further, the light shield reduces the excitation light background interference on the physical level.

[0031] As shown in (a) and (b) of FIG. 1, Figure 5 The first water inlet overflow port 4 is composed of a first water inlet 4-1, a first water flow guide groove 4-2, a flow turning angle arc 4-3, and a first water outlet 4-4, which is located 35mm upward at the intersection of the outer side and the bottom arc of the light shield, and is evenly distributed in eight circles. The principle of the bubble outlet is the same, the first water flow guide groove 4-2 is designed as an isotropic circumferential arc to facilitate water exchange. The flow turning angle arc 4-3 is designed between the first water flow guide groove 4-2 and the first water inlet 4-1 and the first water outlet 4-4 to avoid corners so that sediment particles will not be retained and block the first water inlet overflow port 4. At the same time, to ensure the light shielding effect without affecting water exchange, the first water inlet 4-1 and the first water outlet 4-4 are designed with opposite angles, with an angle range of 20°-30° (which can be adjusted according to the diameter of the light shield). Considering that the number of excitation light sources is even and the strength requirement of the light shield, the first water inlet overflow port 4 is evenly distributed along the circumference in eight circles.

[0032] As shown in (a) and (b) of FIG. 1, Figure 4 The second water inlet overflow port 5 is composed of a second water inlet 5-1, a second water flow guide groove 5-2, and a second water outlet 5-3; the second water inlet overflow port 5 is located on the outer side of the bottom arc surface of the light shield, and there are four evenly distributed circles. The third water inlet overflow port 6 is composed of a third water inlet 6-1, a third water flow guide groove 6-2, and a third water outlet 6-3. It is located on the inner side of the bottom arc surface of the light shield, and there are four evenly distributed circles. The second and third water flow guide grooves 5-2 and 6-2 are designed as "S" type (to achieve the bottom light shielding effect). The third water outlet 6-3 is designed as a circular arc protrusion type, which mainly functions to ensure that the water and sediment in the light shield are not retained when draining.

[0033] The water inlets and outlets of the first, second, and third water inlet overflow ports 4, 5, and 6 can be opposite. When the light shield follows the instrument into the water to be measured, 4-1, 5-1, and 6-1 are set as water inlets. When the light shield is taken out of the water to be measured, the water inlets and outlets are opposite. The first, second, and third water inlet overflow ports 4, 5, and 6 are evenly distributed along the circumference on the outer shell of the light shield, and are sequentially arranged downward at a certain interval from the top arc surface of the cabin structure.

[0034] Further, in order to ensure the light shielding effect and structural strength, the designed light shielding cover has a thickness of 12-15mm.

[0035] Further, the designed structure is relatively complex, the guide groove structure is built-in, and the machining is difficult, and generally 3D printing is used.

[0036] Further, in terms of materials, in order to achieve the light shielding effect, a black resin material can be selected, and at the same time, in order to further eliminate the influence of scattered light, a light-absorbing material can be sprayed on the inner side wall.

[0037] Further, the shape of the outer water outlet can be diversified, for example, a hole type and multiple long strip shapes (impurities such as primary filtering water grass and large particles).

[0038] After the light shielding cover of the utility model is connected with the optical monitoring sensor, it can be put into the water body to be measured to carry out measurement work. At the same time, in order to verify the light shielding performance and water flow exchange effect of the light shielding cover, the chlorophyll sensor with the light shielding cover is installed on the underwater glider to carry out deep sea profile measurement, and the measurement depth reaches 3500 meters. The measurement result is shown in FIG. 6. In the process of rising and falling of the underwater glider in 3500 meters of seawater depth, the measurement data does not appear large change deviation, thereby verifying that the light shielding cover has excellent light shielding performance and water flow exchange effect.

Claims

1. An optical monitoring sensor light shield, characterized in that The light shield is a cabin structure, the top of the cabin structure is a closed circular arc surface, the bottom of the cabin structure is an open design, the cabin structure is provided with a bubble removal overflow port, an instrument fixing port, a light extinction thread, a first, second and third water inlet overflow port, wherein, The bubble removal overflow port is composed of a bubble inlet port, a bubble flow guide groove, a flow corner arc port and a bubble outlet port, the bubble inlet port is designed with a greater than 90-degree cutting angle, the bubble flow guide groove is designed with an isotropic circular arc, the flow corner arc port is arranged between the bubble flow guide groove and the bubble inlet port and the bubble outlet port, the bubble inlet port and the bubble outlet port are designed with an opposite included angle, and the bubble removal overflow port is uniformly distributed along the circumference on the end surface of the light shield; The instrument fixing port is composed of a fixing end surface, a fixing screw storage port and a mounting port, is uniformly distributed along the circumference on the end surface of the light shield, the screw is inserted into the fixing end surface inlet and fixed with the thread port of the light window section through the mounting port, and the installed screw is placed in the fixing screw storage port; The light extinction thread is composed of a circle of equidistant spiral upward trapezoidal threads and is located on the groove wall surface of the light shield; The first water inlet overflow port is composed of a first water inlet port, a first water flow guide groove, a flow corner arc and a first water outlet port; the first water flow guide groove is designed with an isotropic circular arc, and the flow corner arc is arranged between the first water flow guide groove and the first water inlet port and the first water outlet port; The second water inlet overflow port is composed of a second water inlet port, a second water flow guide groove and a second water outlet port; the second water flow guide groove is S-shaped; The third water inlet overflow port is composed of a third water inlet port, a third water flow guide groove and a third water outlet port; the third water flow guide groove is S-shaped, and the circular arc near the third water outlet port is designed as a convex type.

2. An optical monitoring sensor light shield according to claim 1, wherein, The thickness of the concentric circle of the light shield is between 12-15mm.

3. The optical monitoring sensor light shield of claim 1, wherein, The shape of the water outlet port is a hole type or a long strip shape.

4. The optical monitoring sensor light shield of claim 1, wherein, The first, second and third water inlet overflow ports are uniformly distributed along the circumference on the light shield shell and are sequentially arranged downward at a certain interval from the top circular arc surface of the cabin structure.

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