Study and Fabrication of the Dual Band-pass in Grain Screening System

Xiuhua, 付秀华 Fu; Song-lin, 何松霖 He; Xing-ming, 贾星明 Jia; Dongmei, 刘冬梅 Liu; Zhang, Jing; Shuang, 刘爽 Liu

doi:10.3788/gzxb20144312.1216001

Cited by 3 publications

(2 citation statements)

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“…The design methods for multi−bandpass filter membranes include multi−membrane combinations [19,22], a guided−mode resonance filter [23], and membrane designs based on the F−P structure. The F−P structure design methods include increasing the interference order [18], serially connecting multiple F−P cavities [16], and adjusting the bandwidth matching coefficient [24,25], which can adjust the passband position and passband width of the basic membrane system. However, due to material's refractive index limitations, the phase shift of reflection on both sides of the center wavelength is fixed, and can only be designed within the width range of the cutoff band, making it impossible to design a multi−bandpass filter with wider ranges.…”

Section: Design Of Multi−bandpass Filtermentioning

confidence: 99%

Development of Visible Multi−Bandpass Filter Based on F−P Structure

Jiang,

Fan,

et al. 2023

Coatings

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In order to reduce the noise interference of smart wearable devices, spectral filtering technology is used to suppress noise. This technology prevents interference signals from entering the detector from the source, thereby achieving high−precision noise reduction processing. According to the system requirements, a multi−bandpass filter with a wavelength range of 400~1000 nm was designed and prepared on a BK7 substrate. Ta2O5 and SiO2 were selected as the high− and low−refractive−index materials, respectively. By analyzing the −Fabry–Perot narrowband theory, the bandwidth matching coefficient was computed, and the interference order was calculated using the interval of the transmission peak wavelengths. Multiple F−P coating systems were connected through the matching layer to adjust the position of the transmission peak and broaden the bandwidth range. The design was optimized using Macloed film system design software, resulting in the design of a wide half−wave and cutoff multi−bandpass filter. The appropriate preparation process was chosen based on changes in refractive index, surface roughness, and the temperature gradient of the materials. The filter was then produced using Leybold SYRUSpro1110. Sensitivity, filter roughness, and the weak absorption of the film system were tested, and the results met the system requirements.

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Section: Design Of Multi−bandpass Filtermentioning

confidence: 99%

Development of Visible Multi−Bandpass Filter Based on F−P Structure

Jiang,

Fan,

et al. 2023

Coatings

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“… [6] . For the center wavelength 0  of the monolayer film, in the condition of vertical incidence, the reflectance R can be calculated by the following equation.…”

Section: Tab1 the Main Parameters Of Materialsmentioning

confidence: 99%

Fabrication of Filter Film Using in Polarized Light Guide Prism System

Liu

Wang

et al. 2014

KEM

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Aiming at the special requirements for filter film of the optical prismatic system, basing on the design theory, and choosing the appreciate film materials, a high reflectance film and a splitter film are designed respectively. The films can satisfy with the optical requirement perfectly, when the incidence light is P polarized at the 25 angle in the range of the visible wavelengths (450nm~650nm). During the preparation process, the optical film absorption is solved by continually optimizing the process parameters, such as temperature, rate of evaporation and ion assisted deposition parameters, etc. Meanwhile, the error produced in the process of preparation is analyzed and revised through several repeated tests and researches, so that the control precision of layer thickness is improved. Finally the high-reflective film with average reflectance over 99.5% in the 450~500nm band and the beam splitting film with transmittance and reflectance ratio of 1:1 and 1:2 are prepared respectively (both errors are below 1%) in the 450~650nm band. After the spectrum testing and analyzing, the spectrum curve shows that all the parameters meet the basic requirements for usage.

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