Grating band transmittance measuring device

Abstract

The application provides a grating strip transmittance measuring device, which comprises an illumination light source, a grating sheet, an optical lens group and a detection module; the illumination light source emits light rays with a set intensity; the grating sheet, the optical lens group and the detection module are sequentially arranged along the emission direction of the light rays; the grating sheet comprises a pattern surface arranged close to the optical lens group, and the pattern surface is provided with at least one grating strip of a transmittance parameter. The application expands the measurable size range of the measuring target, and improves the measuring efficiency and accuracy.

Description

Technical Field

[0001] This application relates to the field of optical element measurement technology, and in particular to a device for measuring the transmittance of grating strips. Background Technology

[0002] In existing technologies, transmittance testing schemes for optical components such as filter transmittance measurement and cover plate ink transmittance measurement are as follows: Figure 1 As shown: The light source is output through an optical fiber and collimated by a collimating lens. The collimated light passes through the optical element under test and enters the integrating sphere, which is connected to a fiber optic spectrometer via an optical fiber. The spectrometer analyzes the spectral distribution within the integrating sphere and transmits the results to a computer via a data cable. Finally, the results are analyzed and displayed in detail using software.

[0003] The basic principle of existing spectral transmittance measurement methods is as follows: under the same light source and light intensity conditions, the response of the spectrometer is acquired separately when there is no sample and when there is a sample. The transmittance is obtained by calculating the ratio of the two responses. Typically, transmittance is the ratio of the sample's transmission spectrum to a reference spectrum.

[0004] Therefore, the hardware design and measurement principles of existing measurement schemes together limit the size of the optical components under test, typically requiring the size of the optical components to be greater than 0.5 mm, or even exceeding 1 mm. This leads to difficulties in testing small-sized targets, especially for targets with different spectral transmittance between adjacent small-sized targets, resulting in inaccurate test data. Summary of the Invention

[0005] The purpose of this application is to provide a grating strip transmittance measuring device to solve the technical problems of existing technologies, such as difficulty in measuring small-sized targets and the ease with which measurement errors occur.

[0006] To address the aforementioned technical problems, this application provides a grating strip transmittance measuring device. The device includes: an illumination source, a grating sheet, an optical lens group, and a detection module. The illumination source emits light of a set intensity, and the grating sheet, optical lens group, and detection module are arranged sequentially along the light emission direction. The grating sheet includes a patterned surface located near the optical lens group, and a grating strip with at least one transmittance parameter is disposed on the patterned surface. The light emitted by the illumination source passes through the patterned surface and then passes through the optical lens group to form an image. The detection module collects the light passing through the patterned surface and the optical lens group, and performs spectral analysis on the light to determine the transmittance of the grating sheet.

[0007] Preferably, the lighting source includes at least one of white LED, monochrome LED, multicolor LED, laser, and halogen lamp.

[0008] Preferably, it is at least one of a transmissive lens and a reflective lens.

[0009] Preferably, the shape of the grating strip includes at least one of small-sized shapes such as stripes, dots, and grids.

[0010] Preferably, the detection module includes a spectrometer that collects light passing through the patterned surface and the optical lens group.

[0011] Preferably, the detection module further includes a light-collecting module, which is located on the light-emitting side of the optical lens group and connected to the spectrometer. The light-collecting module is provided with a light-collecting surface. Light passing through the patterned surface and the optical lens group is irradiated onto the light-collecting surface, and the light-collecting module collects the light and imports it into the spectrometer for spectral analysis.

[0012] Preferably, the detection module further includes a light-guiding optical fiber, one end of which is connected to a light-receiving module and the other end to a spectrometer. After the light-receiving module collects the light, it guides the light into the spectrometer via the light-guiding optical fiber for spectral analysis.

[0013] Compared with existing technologies, this application uses optical magnification to magnify the target being measured, making the image of the target larger than the light-receiving module. This allows for the measurement of transmittance for targets smaller than 0.1 mm. Furthermore, due to the optical magnification, the corresponding narrow band of the target being measured can be observed simultaneously. By moving the target or the light-receiving system, transmittance measurements of different narrow bands can be achieved, thus improving the efficiency and accuracy of the measurement. Attached Figure Description

[0014] To more clearly illustrate the solutions in this application, the accompanying drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of an existing technology transmittance testing device;

[0016] Figure 2 This is a block diagram of the grating strip transmittance measuring device of this application;

[0017] Figure 3 This is a schematic diagram of the grating strip transmittance measuring device of this application;

[0018] Figure 4 This is a schematic diagram of the grating sheet with grating strips in this application.

[0019] Reference numerals in the figures: 11. Illumination source; 12. Grating sheet; 13. Optical lens group; 14. Light receiving surface; 15. Light receiving module; 16. Optical fiber; 17. Spectrometer. Detailed Implementation

[0020] 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 pertains; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application, are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, not to describe a particular order.

[0021] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0022] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0023] Please see Figure 2 and Figure 3 This application discloses a grating strip transmittance measuring device, which includes: an illumination source 11, a grating sheet 12, an optical lens group 13, and a detection module; the illumination source 11 emits light of a set intensity, and the grating sheet 12, the optical lens group 13, and the detection module are arranged sequentially along the emission direction of the light.

[0024] The grating sheet 12 includes a patterned surface disposed near the optical lens group 13, and a grating strip with at least one transmittance parameter is disposed on the patterned surface; the light emitted by the illumination source 11 passes through the patterned surface and is then imaged by the optical lens group 13; the detection module collects the light passing through the patterned surface and the optical lens group 13, and performs spectral analysis on the light to determine the transmittance of the grating sheet 12.

[0025] The lighting source 11 includes at least one of white LED, monochrome LED, multicolor LED, laser, and halogen lamp.

[0026] The optical lens group 13 includes at least one type of lens composed of single or multiple lenses, such as a transmission lens or a reflection lens, and preferably a double telecentric lens.

[0027] In this embodiment, the optical magnification method of the optical lens group 13 is used to magnify the size of the grating strip on the grating sheet, thereby achieving a measurable effect.

[0028] In this embodiment, for the example of optical magnification using a double telecentric lens, since the aperture of the double telecentric lens is generally small and the size of the measurement target is small, it can be considered that the test result of the transmittance measurement target of the grating plate 12 is close to parallel light incidence.

[0029] Please see Figure 4 In this embodiment, each grating strip in the patterned surface 12a, such as 12a1, 12a2, and 12a3, may have different transmittance parameters. The shape of the grating strip includes at least one of medium-sized shapes such as stripes, dots, and grids.

[0030] The detection module includes a spectrometer 17, which collects light passing through the patterned surface and the optical lens group 13.

[0031] The detection module also includes a light-collecting module 15, which is located on the light-emitting side of the optical lens group 13. The light-collecting module 15 is connected to the spectrometer 17. The light-collecting module 15 is provided with a light-collecting surface 14. Light passing through the patterned surface and the optical lens group 13 is irradiated onto the light-collecting surface 14. After being collected by the light-collecting module 15, it is introduced into the spectrometer 17 for spectral analysis.

[0032] The detection module also includes a light guide fiber 16, one end of which is connected to a light receiving module and the other end is connected to a spectrometer 17. After the light receiving module 15 collects the light, it guides the light into the spectrometer 17 via the light guide fiber 16 for spectral analysis.

[0033] The following is combined with Figures 2 to 4 The working principle of this application will be explained.

[0034] First, turn on the illumination source 11 to block the detection module, i.e., the spectrometer 17, and acquire the dark spectrum D0. Then, remove the grating plate 12, turn on the illumination source 11, and use the detection module, i.e., the spectrometer 17, to acquire the bright spectrum L1. Next, place the grating plate 12 on the measurement stage, move the grating plate 12 so that the image of the target narrow band on the grating plate 12 is within the light-receiving range of the detection module, and the measured image of the target narrow band is larger than the light-receiving size of the detection module. Use the detection module to acquire the spectrum Lt of the target narrow band. The spectrum Lt can be acquired in two ways: placing the grating plate 12 on the measurement stage and moving the grating plate 12 so that the image of the target narrow band on the grating plate 12 is within the light-receiving range of the light-receiving module 15, and measuring the image of the target narrow band; or, moving the grating plate 12 or using the detection module position to measure the transmittance of different parts of the object being measured. Finally, obtain the transmittance of the target narrow band from the grating plate 12.

[0035] This invention employs a novel grating strip transmittance measurement device, particularly by using optical magnification to enlarge the target image, making it larger than the size of the receiving module. This enables transmittance measurement of targets smaller than 0.1 mm. Furthermore, due to the optical magnification, the corresponding target narrowband can be observed simultaneously. By moving the target or the receiving module, transmittance measurements of different narrowbands can be achieved, expanding the measurable size range of the target and improving measurement efficiency and accuracy.

[0036] Obviously, the embodiments described above are only some embodiments of this application, not all embodiments. The accompanying drawings show preferred embodiments of this application, but do not limit the patent scope of this application. This application can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this application's specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the scope of patent protection of this application.

Claims

1. A device for measuring the transmittance of a grating strip, characterized in that, The device includes: an illumination source, a grating sheet, an optical lens group, and a detection module; the illumination source emits light of a set intensity, and the grating sheet, the optical lens group, and the detection module are arranged sequentially along the emission direction of the light. The grating sheet includes a patterned surface disposed near the optical lens group, and a grating strip with at least one transmittance parameter is disposed on the patterned surface; the light emitted by the illumination source passes through the patterned surface and then passes through the optical lens group to form an image; the detection module collects the light passing through the patterned surface and the optical lens group, and performs spectral analysis on the light to determine the transmittance of the grating sheet.

2. The grating strip transmittance measuring device according to claim 1, characterized in that, The lighting source includes at least one of white LED, monochrome LED, multicolor LED, laser, and halogen lamp.

3. The grating strip transmittance measuring device according to claim 1, characterized in that, The optical lens group includes at least one of a transmissive lens and a reflective lens.

4. The grating strip transmittance measuring device according to claim 1, characterized in that, The shape of the grating strip includes at least one of stripes, dots, and grids.

5. The grating strip transmittance measuring device according to claim 1, characterized in that, The detection module includes a spectrometer that collects light passing through the patterned surface and the optical lens group.

6. The grating strip transmittance measuring device according to claim 5, characterized in that, The detection module further includes a light-collecting module, which is disposed on the light-emitting side of the optical lens group and connected to the spectrometer. The light-collecting module is provided with a light-collecting surface. Light passing through the patterned surface and the optical lens group is irradiated onto the light-collecting surface. The patterned surface and the light-collecting surface satisfy an imaging relationship with respect to the optical lens group. The light collected by the light-collecting module is then imported into the spectrometer for spectral analysis.

7. The grating strip transmittance measuring device according to claim 6, characterized in that, The detection module also includes a light-guiding optical fiber, one end of which is connected to the light-receiving module and the other end of which is connected to the spectrometer. After the light-receiving module collects light, it guides the light into the spectrometer via the light-guiding optical fiber for spectral analysis.

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