Light transmittance testing equipment

Abstract

The utility model relates to a light transmittance test equipment, including darkroom, light source device, band pass filtering device, two-dimensional detection device and signal acquisition and processing device, light source device is provided the bottom of darkroom, the darkroom is provided with the partition plate, the partition plate is provided with the through-hole, and the through-hole is provided with the dustproof window, and the signal acquisition and processing device is provided with the two-dimensional detection device and the signal acquisition and processing device. The two-dimensional detection device is fixed to the partition plate and right faces the dustproof window, the band-pass light filtering device is located between the two-dimensional detection device and the dustproof window, the two-dimensional detection device is located above the band-pass light filtering device, and light emitted by the light source device sequentially passes through the dustproof window and the band-pass light filtering device to reach the two-dimensional detection device. And the signal acquisition and processing device is connected with the two-dimensional detection device through a signal line. The equipment disclosed by the utility model is convenient to operate and wide in detection range, and can quickly realize the spectral transmittance detection of complex samples with large area, non-uniformity, multiple colors and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical detection equipment technical field especially relates to a transmittance test equipment. BACKGROUND

[0002] The non-uniformity woven fabric represented by sunshade net and sunshade cloth is faced with the definition and detection difficulty of "transmittance", specifically including: the non-uniformity woven fabric has a gap, and the gap ratio of the net-shaped woven fabric is particularly non-negligible; because the light intensity detection probe of the conventional transmittance detector has a small photosensitive area, a larger measurement deviation will be caused by the detection head falling in the shadow or gap of the textile strip; one solution is to move multiple points and collect dozens or hundreds of data points for averaging, such as the scheme proposed in Chinese patent CN220912983U, which uses an electric telescopic rod, a sliding block and the like for two-dimensional motion to realize multi-point detection; but this scheme still faces problems such as small amount of detection data and slow detection speed;

[0003] The non-uniformity woven fabric itself has different colors, and different users have specific requirements for the transmittance of sunshade net in different wave bands, such as different light wave bands required for the growth of various plants and the prevention of insects; the detection spot of the conventional spectrometer is usually in the order of millimeters, and there will be significant differences between the detection area falling in the gap and the detection area falling on the woven strip of different colors, and the data of a single test is difficult to represent the average transmittance of the entire woven fabric related to the spectrum;

[0004] In addition, some woven fabric materials themselves also have a fluorescent effect and will emit long-wave fluorescence under the irradiation of short-wave photons; in this case, various spectrometers using monochromatic incident light as a probe cannot detect this kind of photo-induced fluorescence signal, that is, it is difficult to detect this fluorescent effect. SUMMARY

[0005] In order to solve the above technical problems, the purpose of the utility model is to provide a transmittance test equipment, which can quickly realize the spectral transmittance detection of complex samples such as large area, non-uniformity and multi-color.

[0006] In order to achieve the above utility model purpose, the utility model adopts the following technical scheme:

[0007] The application discloses a light transmittance testing device which comprises a darkroom, a light source device, a band-pass filter device, a two-dimensional detection device and a signal acquisition and processing device.

[0008] As a preferred solution, the band-pass filter device comprises a band-pass filter and a filter mounting disc, the filter mounting disc is rotationally arranged on the partition plate, a plurality of hole positions are uniformly and spacedly arranged on the filter mounting disc, the band-pass filter is mounted on the hole position of the filter mounting disc, and rotation of the filter mounting disc can make the band-pass filters on different hole positions coaxially coincide with the dustproof window and the two-dimensional detection device respectively.

[0009] As a preferred solution, the band-pass filter device further comprises a rotating motor fixed on the partition plate through a screw, and the filter mounting disc is fixed on the rotating shaft of the rotating motor.

[0010] As a preferred solution, the filter mounting disc is provided with a protruding part, and the partition plate is further provided with a filter positioning device matched with the protruding part on one side of the filter mounting disc.

[0011] As a preferred solution, the two-dimensional detection device comprises a black-and-white camera and a lens connected through threads, the filter mounting disc is at least two sets, each set of the filter mounting disc is provided with an empty position without mounting the band-pass filter, and the sets of filter mounting discs are arranged in a stacked mode, only one band-pass filter in the sets of filter mounting discs is coaxially coincided with the lens, and the others are coaxially coincided with the lens as the empty positions.

[0012] As a preferred solution, the two-dimensional detection device comprises a black-and-white camera and a lens connected through threads, the band-pass filter is a reflective filter with a rectangular narrow-band filter characteristic, and the area of the band-pass filter completely covers the lens.

[0013] As a preferred solution, the signal acquisition and processing device issues an instruction to the two-dimensional detection device and obtains detection data of the two-dimensional detection device.

[0014] As a preferred solution, the light source device comprises a planar light source and a light-shielding baffle, the planar light source is fixed on the bottom of the darkroom, the light-shielding baffle is rotationally arranged on one side of the planar light source through a baffle hinge, and the light-shielding baffle can completely cover the planar light source.

[0015] As a preferred scheme, the two-dimensional detection device comprises a black-and-white camera and a lens connected through threads, the spectral characteristic of the planar light source is continuous white light covering a required wave band, and a diffuse scattering plate is installed on the light emitting surface of the planar light source.

[0016] As a preferred scheme, the upper part of the partition plate in the darkroom is provided with a dust cover, the lower part of the partition plate in the darkroom is further provided with a sample conveying door, and the inner walls of the darkroom are all light absorbing inner walls.

[0017] Compared with the prior art, the device has the beneficial effects that:

[0018] The device of the present application separates the darkroom into upper and lower regions by the partition plate, the light source device is arranged in the lower part, the band-pass filter device and the two-dimensional detection device are arranged in the upper part of the darkroom, during detection, the sample to be detected is placed on the upper part of the light source device, light is emitted from the light source device, sequentially passes through the sample to be detected, the dustproof window and the band-pass filter device to reach the two-dimensional detection device, and then is processed by the signal acquisition and processing device to obtain the spectral transmittance. BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings accompanying the specification of the present application serve to provide further understanding of the present application, the illustrative embodiments of the present application and the description thereof serve to explain the present application, and do not constitute a limitation on the present application.

[0020] Figure 1 is a schematic diagram of the overall appearance structure of the present application;

[0021] Figure 2 is a schematic diagram of the internal structure of the present application (not including the band-pass filter device);

[0022] Figure 3 is a schematic diagram of the internal structure of the present application (including a single set of band-pass filter device) and the signal acquisition and processing device;

[0023] Figure 4 is a side view schematic diagram of the internal structure of the present application (including a single set of band-pass filter device);

[0024] Figure 5 is an isometric view of the two sets of filter mounting discs of the present application (using a two-set band-pass filter device scheme);

[0025] Figure 6 is a top view of the two sets of filter mounting discs of the present application (using a two-set band-pass filter device scheme);

[0026] Figure 7It is the front view of two sets of filter mounting disc (two sets of band-pass filter device scheme is adopted) of the utility model.

[0027] The figure mark is: 1, darkroom;11, light absorption inner wall;12, partition;13, dustproof window;14, dust cover;15, sample transmission door;2, light source device;21, plane light source;22, light shielding baffle;23, baffle hinge;3, band-pass filter device;31, band-pass filter;32, filter mounting disc;33, rotating motor;34, filter positioning device;4, two-dimensional detection device;41, black and white camera;42, lens;43, detector support;5, signal acquisition and processing device. DETAILED DESCRIPTION

[0028] It should be noted that the following detailed description is illustrative only and is intended to provide further description of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0029] It should be noted that the terms used herein are merely for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should also be understood that the terms "comprise" and / or "include" as used herein indicate the presence of the features, steps, operations, devices, components and / or combinations thereof.

[0030] In addition, in the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0031] In addition, the terms "first" and "second" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise stated, the meaning of "multiple" is two or more, unless otherwise explicitly limited.

[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0035] like Figures 1 to 4 As shown, a transmittance testing device includes a dark chamber 1, a light source device 2, a bandpass filter device 3, a two-dimensional detection device 4, and a signal acquisition and processing device 5. The light source device 2 is located at the lower part of the dark chamber 1. A partition plate 12 is provided inside the dark chamber 1. The partition plate 12 has a through hole, and a dustproof window 13 is provided in the through hole. The two-dimensional detection device 4 is fixed on the partition plate 12 and faces the dustproof window 13. The bandpass filter device 3 is located between the two-dimensional detection device 4 and the dustproof window 13, and the two-dimensional detection device 4 is located above the bandpass filter device 3. The light emitted by the light source device 2 passes through the dustproof window 13 and the bandpass filter device 3 in sequence to reach the two-dimensional detection device 4. The signal acquisition and processing device 5 is connected to the two-dimensional detection device 4 through a signal line.

[0036] The darkroom 1 is divided into upper and lower parts by a partition plate 12 and a dustproof window 13. A dustproof cover 14 is also provided on the upper part of the partition plate 12 in the darkroom 1. In this embodiment, the upper part of the darkroom 1 is surrounded by the partition plate 12, the dustproof window 13 and the dustproof cover 14 to protect the bandpass filter device 3 and the two-dimensional detection device 4 in the enclosed space from the influence of external light and dust. A sample transfer door 15 is also provided in the lower part of the darkroom 1. The inner sides of the upper and lower parts of the darkroom 1 are both light-absorbing inner walls 11.

[0037] The light source device 2 includes a planar light source 21 and a light-shielding baffle 22. The planar light source 21 is fixed at the lower part of the darkroom 1. The light-shielding baffle 22 is rotatably mounted on one side of the planar light source 21 via a baffle hinge 23. It can be opened and closed by rotation. When the light-shielding baffle 22 is open, the planar light source 21 can completely pass through the dustproof window 13 to reach the two-dimensional detection device 4. When the light-shielding baffle 22 is closed, it can completely block the planar light source 21.

[0038] In the light source device 2 of this embodiment, the planar light source 21 uses a white LED, whose spectral characteristics are continuous white light covering the required wavelength band; and the light-emitting surface of the planar light source 21 is equipped with a diffuse scattering plate, the main function of which is to fully scatter the light and achieve a uniform imaging effect.

[0039] In other embodiments, a light diffusion plate, ordinary frosted glass, or quartz frosted glass can also be used as the diffuser plate. In other embodiments, a xenon lamp, metal halide lamp, or hybrid light source can also be used as the planar light source 21; even sunlight can be used as the planar light source 21, but in this case, the entire device needs to be placed upside down.

[0040] In other embodiments, the light-shielding baffle 22 may also be a movable or detachable structure; and the movement drive of the light-shielding baffle 22 may also be electrically controlled or manually operated.

[0041] The purpose of using the light-shielding baffle 22 to completely block the planar light source 21 is to provide baseline data for the two-dimensional detection device 4 in a dark environment. In order to obtain baseline data in a dark environment, the light-shielding baffle 22 is used instead of cutting off the power to the planar light source 21, in order to prevent the planar light source 21 from being frequently turned on and off, which would cause unstable light intensity and reduce the lifespan of the light source.

[0042] The bandpass filter device 3 includes a bandpass filter 31 and a filter mounting plate 32. The filter mounting plate 32 is rotatably mounted on the partition plate 12. Multiple holes are evenly spaced on the filter mounting plate 32. The bandpass filter 31 is mounted on the holes of the filter mounting plate 32. Rotating the filter mounting plate 32 can make the bandpass filters 31 on different holes coaxially overlap with the dustproof window 13 and the two-dimensional detection device 4, respectively.

[0043] The two-dimensional detection device 4 includes a black and white camera 41 and a lens 42. The black and white camera 41 and the lens 42 are connected by threads. The black and white camera 41 is fixed on the partition plate 12 by a detector bracket 43. The light emitted by the planar light source 21 passes through the dustproof window 13, the bandpass filter 31, and the lens 42 in sequence to reach the black and white camera 41. The signal acquisition and processing device 5 is connected to the black and white camera 41 through a signal line.

[0044] In other embodiments, the switching of the band-pass filter 31 is realized in a manual way. In the present embodiment, the rotation of the filter mounting disc 32 is realized in an electric way; as shown in Figure 3 and Figure 4 The band-pass filter device 3 further comprises a rotating motor 33 fixed on the partition plate 12 by screws, and the filter mounting disc 32 is fixed on the rotating shaft of the rotating motor 33. The filter mounting disc 32 is provided with a protruding part, and the filter positioning device 34 cooperating with the protruding part is also fixed on one side of the filter mounting disc 32. The filter positioning device 34 uses a pair of slot-type optical coupling photoelectric switches and is connected to the signal acquisition and processing device 5.

[0045] As shown in Figure 3 and Figure 4 The band-pass filter device 3 in the present embodiment comprises a plurality of band-pass filters 31, a filter mounting disc 32, a rotating motor 33, and a filter positioning device 34; wherein the band-pass filters 31 are installed in the hole positions of the filter mounting disc 32, the filter mounting disc 32 is driven to rotate by the rotating motor 33 to switch different band-pass filters 31; the filter mounting disc 32 has a protruding part to trigger the filter positioning device 34, thereby playing a role in precise positioning.

[0046] As shown in Figures 5 to 7 In other embodiments, two or more sets of filter mounting discs 32 are used, each set of filter mounting discs 32 is provided with an empty hole position without installing a band-pass filter 31, and each set of filter mounting discs 32 is stacked up and down, and there is a coincident filter hole position coaxial with the lens 42; in operation, the selected filter mounting disc 32 rotates the required band-pass filter 31 to the lower side of the lens 42, and the remaining filter mounting discs 32 rotate their respective empty positions to the lower side of the lens 42.

[0047] The band-pass filter 31 is a reflective filter with a rectangular narrow-band filter characteristic, and the area of the band-pass filter 31 completely covers the lens 42.

[0048] In the present embodiment, the upper surface of the planar light source 21 is a light diffusion plate; during debugging, a transparent film printed with black lines is placed above the light diffusion plate, the transparent film printed with black lines is imaged on the detection surface of the black-and-white camera 41 by adjusting the lens 42, and a clear black line image is observed through the signal acquisition and processing device 5.

[0049] In the present embodiment, the black-and-white camera 41 used does not contain a color filter layer itself, and uses Mono 8 format; preferably, the maximum length of the sample to be measured is less than 20 degrees in the angle of view of the black-and-white camera 41.

[0050] In the embodiment, the signal acquisition and processing device 5 comprises an electronic computer, a programmable logic controller (PLC) for controlling the equipment, acquiring images and processing image data; the signal acquisition and processing device 5 senses the position of the filter through the filter positioning device 34, and switches to the required band-pass filter 31 by sending a command to the rotating motor 33; then, the signal acquisition and processing device 5 issues an exposure command to the black-and-white camera 41 and obtains its detection data.

[0051] In other embodiments, the signal acquisition and processing device 5 is also connected to the motor for controlling the light-shielding baffle 22.

[0052] The test equipment disclosed in the embodiment can independently measure the spectral transmittance of each local point of a large-area sample corresponding to a million-level pixel point at a strictly defined spectral position and width; through mathematical statistics and reporting, the local and average spectral transmittance of a large-area, non-uniform sample can be accurately and conveniently tested.

[0053] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0054] Although the embodiments of the utility model have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the utility model. The ordinary skilled in the art can change, modify, replace and modify the above-mentioned embodiments in the range of the utility model without departing from the principles and purposes of the utility model. Any simple modification, equivalent change and modification made according to the technical essence of the utility model to the above-mentioned embodiments still belongs to the range of the technical scheme of the utility model.

Claims

1. A light transmittance testing apparatus, characterized by: The application relates to a two-dimensional detection device for detecting a sample, which comprises a darkroom (1), a light source device (2), a band-pass filter device (3), a two-dimensional detection device (4) and a signal acquisition and processing device (5), wherein the light source device (2) is arranged at the lower part of the darkroom (1), a partition plate (12) is arranged in the darkroom (1), the partition plate (12) is provided with a through hole, a dustproof window (13) is arranged in the through hole, the two-dimensional detection device (4) is fixed on the partition plate (12) and faces the dustproof window (13), the band-pass filter device (3) is arranged between the two-dimensional detection device (4) and the dustproof window (13), the two-dimensional detection device (4) is arranged above the band-pass filter device (3), light emitted by the light source device (2) passes through the dustproof window (13) and the band-pass filter device (3) in sequence and reaches the two-dimensional detection device (4), and the signal acquisition and processing device (5) is connected with the two-dimensional detection device (4) through a signal line.

2. The light transmittance testing apparatus according to claim 1, wherein The band-pass filter device (3) comprises a band-pass filter (31) and a filter mounting disc (32), the filter mounting disc (32) is rotatably arranged on the partition plate (12), a plurality of hole positions are uniformly and spacedly arranged on the filter mounting disc (32), the band-pass filter (31) is arranged on the hole position of the filter mounting disc (32), and rotating the filter mounting disc (32) can make the band-pass filters (31) on different hole positions coaxially coincide with the dustproof window (13) and the two-dimensional detection device (4) respectively.

3. The light transmittance testing apparatus according to claim 2, wherein The band-pass filter device (3) further comprises a rotating motor (33) fixed on the partition plate (12) through screws, and the filter mounting disc (32) is fixed on the rotating shaft of the rotating motor (33).

4. The light transmittance testing apparatus according to claim 2, wherein The filter mounting disc (32) is provided with a protruding part, and the partition plate (12) is further provided with a filter positioning device (34) fixed on one side of the filter mounting disc (32) and matched with the protruding part.

5. The light transmittance testing apparatus according to claim 2, wherein The two-dimensional detection device (4) comprises a black-and-white camera (41) and a lens (42) connected through threads, the filter mounting disc (32) is at least two sets, each set of the filter mounting disc (32) is provided with an empty position without the band-pass filter (31), the filter mounting discs (32) are arranged in a stacked mode, only one band-pass filter (31) in the multiple sets of filter mounting discs (32) is coaxially coincided with the lens (42), and the rest are empty positions coaxially coincided with the lens (42).

6. The light transmittance testing apparatus according to claim 2, wherein The two-dimensional detection device (4) comprises a black-and-white camera (41) and a lens (42) connected through threads, the band-pass filter (31) is a reflective filter with a rectangular narrow-band filter characteristic, and the area of the band-pass filter (31) completely covers the lens (42).

7. The light transmittance testing apparatus of claim 1, wherein The signal acquisition and processing device (5) sends an instruction to the two-dimensional detection device (4) and obtains detection data of the two-dimensional detection device (4).

8. The light transmittance testing apparatus of claim 1, wherein, The light source device (2) comprises a planar light source (21) fixed at the bottom of the darkroom (1) and a light-shielding baffle (22) rotatably arranged at one side of the planar light source (21) through a baffle hinge (23), and the light-shielding baffle (22) can completely cover the planar light source (21).

9. The light transmittance testing apparatus of claim 8, wherein, The two-dimensional detection device (4) comprises a black-and-white camera (41) and a lens (42) connected through threads, the spectral characteristics of the planar light source (21) are continuous white light covering the required wave band, and the light emitting surface of the planar light source (21) is provided with a diffuse scattering plate, and the planar light source (21) is imaged on the detection surface of the black-and-white camera (41) through the lens (42).

10. The light transmittance testing apparatus of claim 1, wherein, The upper part of the partition plate (12) in the darkroom (1) is provided with a dust cover (14), the lower part of the partition plate (12) in the darkroom (1) is further provided with a sample conveying door (15), and the inner walls of the darkroom (1) are all light-absorbing inner walls (11).

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