A popular science device demonstrating filter technology

Abstract

The present application discloses a popular science device for demonstrating filter technology. The device comprises a platform, a projection device, an observation device, a screen and a switch. Four narrow-band filters with different central wavelengths are respectively installed on four projection lamps with different negative engraving patterns, and different central wavelength patterns are projected on the screen. The patterns overlap to form a mixed pattern. The experimenter can observe a single central wavelength pattern through the narrow-band filter corresponding to the projection lamp in the observation device. At present, the wavelength and filter technology displayed in the science and technology museum popular science field still remains in the form of Newton dispersion experiment and red, green and blue three-color spectrometer, and the filtering effect of the narrow-band filter cannot be directly shown. The device can improve the display effect, interaction and interest, enable the audience to directly and vividly understand the technical principle of wavelength and filter, and make up for the lack of such technical demonstration device in the existing science and technology museum.

Description

Technical Field

[0001] This invention relates to a popular science device for demonstrating filter technology, specifically for displaying optical technology in science and technology museums, and belongs to the field of optical science popularization and education. Background Technology

[0002] An optical filter is an optical element used to select a desired wavelength of radiation. Filters are made by adding special dyes to a plastic or glass substrate or by depositing an optical film on its surface. They are used to attenuate (absorb) certain wavelengths of light or to precisely select a small range of wavelengths for passage, while reflecting (or absorbing) other unwanted wavelengths. By changing the structure and optical parameters of the filter and its film, various spectral characteristics can be obtained, allowing the filter to control, adjust, and change the transmission, reflection, polarization, or phase state of light waves. Narrowband filters are a subcategory of bandpass filters, and their definition is the same as that of bandpass filters. That is, this type of filter allows light signals to pass through a specific wavelength band, while blocking light signals outside this band. The passband of a narrowband filter is relatively narrow.

[0003] Narrowband filters play a crucial role in many optical applications. Currently, science museum exhibits mainly focus on demonstrating the wavelength of light and the synthesis and decomposition of light, primarily through spectrograms and Newton's dispersion experiments. There are no exhibits showcasing narrowband filters. While visitors may learn about wavelengths, they lack a rational understanding of wavelength and spectrum, and have limited access to information about the applications of narrowband filters. Therefore, how to present the spectrum and filter technology in a vivid and intuitive way has become an urgent problem to be solved in science museum exhibits. Summary of the Invention

[0004] The purpose of this invention is to provide a popular science device for demonstrating filter technology. This device can simulate the effect of multispectral mixed imaging and acquire and compare images of the center wavelength through a narrowband filter to demonstrate the filtering effect of the narrowband filter.

[0005] To achieve the above objectives, this invention provides a science popularization device for demonstrating active infrared imaging technology to the public, comprising a display stand, a projection device, an observation device, a screen, and a switch; wherein, the projection device is fixedly installed above the display stand, and the projection device consists of four projection structures of different wavelengths, each of which can project an image of a specific wavelength; the switch is fixedly installed on the display stand behind the projection device, and is used to control the opening and closing of the projection device; the screen is fixedly installed directly in front of the projection device, and is used to display the image projected by the projection device; the observation device is installed on the right side of the projection device, aligned with the screen, and the image on the screen can be observed through the observation device.

[0006] The projection device comprises a first projection structure, a second projection structure, a third projection structure, and a fourth projection structure.

[0007] The first projection structure is a cylindrical structure. A first full-spectrum projection lamp is set at the rear of the cylinder, which can illuminate light of various wavelengths in the visible light spectrum, close to the solar spectrum. The front of the cylinder is the light outlet, which is equipped with a 450nm narrowband filter A with a bandwidth of 10nm. A first etched pattern is installed on the outside of the 450nm narrowband filter A. The light beam emitted by the full-spectrum projection lamp passes through the 450nm narrowband filter A and finally projects the first etched pattern onto the screen. The wavelength of the projected image is 450nm, and the pattern is blue.

[0008] The second projection structure is a cylindrical structure. A second full-spectrum projection lamp is installed at the rear of the cylinder, which can illuminate light of various wavelengths in the visible light spectrum, close to the solar spectrum. The front of the cylinder is the light outlet, which is equipped with a 520nm narrowband filter A with a bandwidth of 10nm. A second etched pattern is installed on the outside of the 520nm narrowband filter A. The light beam emitted by the full-spectrum projection lamp passes through the 520nm narrowband filter A and finally projects the second etched pattern onto the screen. The wavelength of the projected image is 520nm, and the pattern is green.

[0009] The third projection structure is a cylindrical structure. A third full-spectrum projection lamp is set at the rear of the cylinder, which can illuminate light of various wavelengths in the visible light spectrum, close to the solar spectrum. The front of the cylinder is the light outlet, which is equipped with a 590nm narrowband filter A with a bandwidth of 10nm. A third etched pattern is installed on the outside of the 590nm narrowband filter A. The light beam emitted by the full-spectrum projection lamp passes through the 590nm narrowband filter A and finally projects the third etched pattern onto the screen. The wavelength of the projected image is 590nm, and the pattern is yellow.

[0010] The fourth projection structure is a cylindrical structure. A fourth full-spectrum projection lamp is installed at the rear of the cylinder, which can illuminate light of various wavelengths in the visible light spectrum, close to the solar spectrum. The front of the cylinder is the light outlet, which is equipped with a 700nm narrowband filter A with a bandwidth of 10nm. A fourth etched pattern is installed on the outside of the 700nm narrowband filter A. The light beam emitted by the full-spectrum projection lamp passes through the 700nm narrowband filter A and finally projects the fourth etched pattern onto the screen. The wavelength of the projected image is 700nm, and the pattern is red.

[0011] The first, second, third, and fourth intaglio patterns are all hollow intaglio patterns, and light passes through the hollow parts of the patterns to present the patterns on the screen.

[0012] The observation device comprises a housing, a turntable, a 450nm narrowband filter B, a 520nm narrowband filter B, a 590nm narrowband filter B, a 700nm narrowband filter B, and an observation port. By rotating the turntable, different wavelengths of narrowband filters can be arbitrarily switched, and the changes in the screen projection pattern seen through the narrowband filters of different wavelengths can be observed through the observation port.

[0013] The outer shell is a hollow metal shell with a rotary bearing at the center.

[0014] The turntable has four evenly distributed circular holes on its edge, with the diameter of the holes slightly larger than that of the narrow band filter. The turntable has a bearing hole at its center, and the turntable is connected to the rotating bearing of the outer shell through the bearing hole. The turntable is located in the middle of the hollow metal shell of the outer shell. When the turntable rotates to a specific position, the circular holes coincide with the center of the observation port.

[0015] The 450nm narrowband filter B, 520nm narrowband filter B, 590nm narrowband filter B, and 700nm narrowband filter B are installed clockwise in sequence on the round hole of the turntable.

[0016] The observation port is located at the upper end of the outer casing. The observation port is a perforated structure that is open from front to back, and its diameter is equal to the diameter of the circular hole on the edge of the turntable. The switch has four buttons, which, from left to right, control the opening and closing of the first, second, third, and fourth projector structures.

[0017] Advantages and positive effects of the present invention.

[0018] (1) This invention simulates mixed projection images of multiple wavelength bandwidths by using multiple full-spectrum projection lamps and narrowband filters. By comparing mixed images of multiple wavelength bandwidths with image information of a certain bandwidth, as well as comparing image information of different bandwidths, visitors can experience the relationship between wavelength bandwidth and narrowband filters and further understand the scientific principles of light wavelength bandwidth and filters.

[0019] (2) The present invention realizes the free adjustment of multi-bandwidth mixed images between 2 and 4 center wavelengths. The adjustment can be completed by switching on and off the corresponding projection lamp according to actual needs. The corresponding filter in the observation device does not need to be removed. When observing the screen through the filter that has not been removed, no image will be observed, and the teaching effect will not be affected.

[0020] (3) This invention presents the correspondence between wavelength bandwidth and narrowband filter to the user in a real way through comparison. Moreover, the user can operate it interactively and use it in the exhibition hall, which can increase the fun of interactive learning in the exhibition hall and deepen the participants' learning and understanding of wavelength and narrowband filter technology. Attached Figure Description

[0021] Figure 1 This is a front view of a popular science device demonstrating filter technology.

[0022] Figure 2 This is a schematic diagram of the projection device.

[0023] Figure 3 This is a schematic diagram of the observation device.

[0024] Figure 4 This is a schematic diagram of the turntable.

[0025] The components include: 1. Exhibition stand; 2. Projection device; 21. First projection structure; 211. First full-spectrum projection lamp; 212. 450nm narrowband filter A; 213. First etched pattern; 22. Second projection structure; 221. Second full-spectrum projection lamp; 222. 520nm narrowband filter A; 223. Second etched pattern; 23. Third projection structure; 231. Third full-spectrum projection lamp; 232. 590nm narrowband filter A; 233. Third etched pattern; 24. 1. Fourth projection structure; 241. Fourth full-spectrum projection lamp; 242. 700nm narrowband filter A; 243. Fourth engraved pattern; 3. Observation device; 31. Housing; 311. Rotary bearing; 32. Turntable; 321. Circular hole; 322. Bearing hole; 33. 450nm narrowband filter B; 34. 520nm narrowband filter B; 35. 590nm narrowband filter B; 36. 700nm narrowband filter B; 37. Observation port; 4. Screen; 5. Switch. Detailed Implementation

[0026] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0027] like Figure 1 As shown, the display stand 1 serves to support the other parts of the fixing device; the projection device 2 consists of 4 projection structures and is fixedly installed on the display stand 1; there are 4 switches 5, which are fixedly installed on the display stand 1 behind the projection device 2; the screen 4 is installed directly in front of the projection device 2, and the projection device 2 projects the pattern onto the screen 4, and the patterns overlap to form a mixed pattern; the observation device 3 is located to the right of the projection device 2 and is fixedly installed above the display stand 1. The observation device 3 is aligned with the screen 4, and the mixed pattern on the screen 4 can be seen through the observation device 3.

[0028] like Figure 2As shown, the projection device 2 consists of four projection structures, including a first projection structure 21, a second projection structure 22, a third projection structure 23, and a fourth projection structure 24. The first projection structure 21 comprises a first full-spectrum projection lamp 211, a 450nm narrowband filter A 212, and a first etched pattern 213. The 450nm narrowband filter A 212 is fixedly installed at the light outlet of the first projection structure 21, and the first etched pattern 213 is installed outside the 450nm narrowband filter A 212, allowing light with a wavelength close to the center wavelength of the 450nm narrowband filter A 212 to pass through the first etched pattern 213 to form an image; the pattern is blue. The second projection structure 22 comprises a second full-spectrum projection lamp 221, a 520nm narrowband filter A 222, and a second etched pattern 223. The 520nm narrowband filter A 222 is fixedly installed at the light outlet of the second projection structure 22, and the second etched pattern 223 is installed outside the 520nm narrowband filter A 212. Externally, light with a wavelength close to the center wavelength of the 520nm narrowband filter A 222 passes through the second etched pattern 223 to form an image, which appears green. The third projection structure 23 consists of a third full-spectrum projection lamp 231, a 590nm narrowband filter A 232, and a third etched pattern 233. The 590nm narrowband filter A 232 is fixedly installed at the light outlet of the third projection structure 23, and the third etched pattern 233 is installed externally to the 590nm narrowband filter A 232, allowing light with a wavelength close to the center wavelength of the 590nm narrowband filter A 232 to pass through the third etched pattern 233 to form an image, which appears yellow. The fourth projection structure 24 consists of a fourth full-spectrum projection lamp 241, a 700nm narrowband filter A 242, and a fourth etched pattern 243. The 700nm narrowband filter A 242 is fixedly installed at the light outlet of the fourth projection structure 24, and the fourth etched pattern 243 is installed externally to the 700nm narrowband filter A 222. Externally, light of a wavelength close to the center wavelength of a narrowband filter A 242 (approximately 700nm) passes through a fourth etched pattern 243 to form an image, which is red. The patterns of the four wavelengths are mixed and superimposed and projected onto the screen, and the mixed pattern is white.

[0029] like Figure 3As shown, the observation device 3 includes a housing 31, a rotary bearing 311, a turntable 32, a 450nm narrowband filter B 33, a 520nm narrowband filter B 34, a 590nm narrowband filter B 35, a 700nm narrowband filter B 36, and an observation port 37. The housing 31 is a hollow metal shell with an opening at the top. The observation port 37 is installed at the opening at the top of the housing 31. The rotary bearing 311 is installed inside the housing 31, and the turntable 32 is installed inside the housing. The top of the housing 31 is open, and the turntable 32 is installed inside the housing. Part of the turntable 32 is exposed outside the housing 31 and can be rotated by hand. The 450nm narrowband filter B 33, 520nm narrowband filter B 34, 590nm narrowband filter B 35, and 700nm narrowband filter B 36 are evenly installed on the turntable 32 in a circumferential shape. The installation positions of the 520nm narrowband filter B, 34, 590nm narrowband filter B, 35, and 700nm narrowband filter B, and 36 can all be aligned with the observation port 37 by rotating the turntable. The 450nm narrowband filter B 33 corresponds to the center wavelength of the 450nm narrowband filter A 212, the 520nm narrowband filter B 34 corresponds to the center wavelength of the 520nm narrowband filter A 222, the 590nm narrowband filter B 35 corresponds to the center wavelength of the 590nm narrowband filter A 232, and the 700nm narrowband filter B 36 corresponds to the center wavelength of the 700nm narrowband filter A 242. By rotating the turntable 32, the user can switch between the four narrowband filters with different center wavelengths and observe the mixed pattern on screen 4.

[0030] like Figure 4 As shown, the turntable 32 has four circular holes 321 for mounting a 450nm narrowband filter B 33, a 520nm narrowband filter B 34, a 590nm narrowband filter B 35, and a 700nm narrowband filter B 36. The turntable 32 has a bearing hole 322 in the center. The turntable 32 is mounted inside the housing 31 and can rotate by rotating the bearing 311.

[0031] In a specific implementation example, the exhibit automatically starts upon power-on, and projection device 2 activates, projecting patterns with different center wavelengths onto screen 4. Multiple center wavelength patterns overlap to form a mixed pattern—a white pattern formed by the mixing of red, yellow, green, and blue patterns on the screen. The user cannot distinguish any single center wavelength pattern. The user observes screen 4 through viewing port 37 and manually rotates dial 32, using 450nm narrowband filters B 33, 520nm narrowband filters B 34, 590nm narrowband filters B 35, and 700nm narrowband filters B 36 respectively. Any one of 36 will allow you to observe the pattern on screen 4 corresponding to the center wavelength of the narrowband filter currently in use. Patterns of other wavelengths will be filtered out because they are different from the wavelength of the narrowband filter currently in use, and therefore cannot be seen. The user uses switch 5 to turn off all projection devices 2, and then presses the button on the projection structure of the projection device 2 corresponding to the center wavelength of the narrowband filter currently in use. The projection structure in the projection device 2 corresponding to the wavelength will open, and the projection device 2 will project the pattern corresponding to the center wavelength onto screen 4, verifying the pattern observed by the user through observation device 3. If it is necessary to reduce the number of center wavelengths that generate the mixed image, simply control the opening and closing of the projection structure in the projection device 2 by using the corresponding button in switch 5. As long as the projection structures in the projection devices 2 with more than two center wavelengths are open at the same time, a mixed image can be generated. The mixed pattern composed of images of different wavelengths will also have different colors, and multiple color pattern changes can be generated.

Claims

1. A popular science device for demonstrating filter technology, characterized in that... A science popularization device demonstrating filter technology includes a display stand, a projection device, an observation device, a screen, and a switch. The projection device is fixedly installed above the display stand and consists of four projection structures with different wavelengths, each capable of projecting an image of a specific wavelength. The switch is fixedly installed on the display stand behind the projection device and is used to control the projection device's on / off state. The screen is fixedly installed directly in front of the projection device and is used to display the image projected by the projection device. The observation device is installed to the right of the projection device, aligned with the screen, allowing observation of the image on the screen.

2. The popular science device for demonstrating filter technology according to claim 1, characterized in that... The projection device comprises a first projection structure, a second projection structure, a third projection structure, and a fourth projection structure. The first projection structure is a cylindrical structure. A first full-spectrum projection lamp is set at the rear of the cylinder, which can illuminate light of various wavelengths in the visible light spectrum, close to the solar spectrum. The front of the cylinder is the light outlet, which is equipped with a 450nm narrowband filter A with a bandwidth of 10nm. A first negative pattern is installed on the outside of the 450nm narrowband filter A. The light beam emitted by the full-spectrum projection lamp passes through the 450nm narrowband filter A and finally projects the first negative pattern onto the screen. The wavelength of the projected image is 450nm, and the pattern is blue. The second projection structure is a cylindrical structure. A second full-spectrum projection lamp is installed at the rear of the cylinder, which can illuminate light of various wavelengths in the visible light spectrum, close to the solar spectrum. The front of the cylinder is the light outlet, which is equipped with a 520nm narrowband filter A with a bandwidth of 10nm. A second etched pattern is installed on the outside of the 520nm narrowband filter A. The light beam emitted by the full-spectrum projection lamp passes through the 520nm narrowband filter A and finally projects the second etched pattern onto the screen. The wavelength of the projected image is 520nm, and the pattern is green. The third projection structure is a cylindrical structure. A third full-spectrum projection lamp is set at the rear of the cylinder, which can illuminate light of various wavelengths in the visible light spectrum, close to the solar spectrum. The front of the cylinder is the light outlet, which is equipped with a 590nm narrowband filter A with a bandwidth of 10nm. A third etched pattern is installed on the outside of the 590nm narrowband filter A. The light beam emitted by the full-spectrum projection lamp passes through the 590nm narrowband filter A and finally projects the third etched pattern onto the screen. The wavelength of the projected image is 590nm, and the pattern is yellow. The fourth projection structure is a cylindrical structure. A fourth full-spectrum projection lamp is installed at the rear of the cylinder, which can illuminate light of various wavelengths in the visible light spectrum, close to the solar spectrum. The front of the cylinder is the light outlet, which is equipped with a 700nm narrowband filter A with a bandwidth of 10nm. A fourth etched pattern is installed on the outside of the 700nm narrowband filter A. The light beam emitted by the full-spectrum projection lamp passes through the 700nm narrowband filter A and finally projects the fourth etched pattern onto the screen. The wavelength of the projected image is 700nm, and the pattern is red. The first, second, third, and fourth intaglio patterns are all hollow intaglio patterns, and light passes through the hollow parts of the patterns to present the patterns on the screen.

3. A popular science device for demonstrating filter technology according to claim 1, characterized in that... The observation device comprises a housing, a turntable, a 450nm narrowband filter B, a 520nm narrowband filter B, a 590nm narrowband filter B, a 700nm narrowband filter B, and an observation port; by rotating the turntable, different wavelengths of narrowband filters can be switched arbitrarily, and the changes in the screen projection pattern seen through the narrowband filters of different wavelengths can be observed through the observation port. The outer shell is a hollow metal shell with a rotary bearing at the center. The turntable has four evenly distributed circular holes on its edge, with the diameter of the holes slightly larger than that of the narrow band filter. The turntable has a bearing hole at its center, and the turntable is connected to the rotating bearing of the outer shell through the bearing hole. The turntable is located in the middle of the hollow metal shell of the outer shell. When the turntable rotates to a specific position, the circular holes coincide with the center of the observation port. The 450nm narrowband filter B, 520nm narrowband filter B, 590nm narrowband filter B, and 700nm narrowband filter B are installed clockwise in sequence on the round hole of the turntable. The observation port is located at the upper end of the outer shell. The observation port is a perforated structure that is open from front to back, and the diameter of the observation port is equal to the diameter of the circular hole on the edge of the turntable.

4. A popular science device for demonstrating filter technology according to claim 1, characterized in that... The switch has four buttons, which, from left to right, control the opening and closing of the first projector structure, the second projector structure, the third projector structure, and the fourth projector structure.

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