A microfilter array based on the principle of spectral difference is prepared to improve the signal-to-noise ratio by eliminating the background. Based on the design of Fabry-Perot periodic multilayer medium film, the narrow-band filter with the central wavelength of 589nm, the bandwidth is about 3.2nm, the transmittance is 60%, and cutoff OD3 was prepared. A filter array with unit size of 11 μm × 11 μm and size of 2048×2048 was prepared by pixelating the optical narrow-band interference film by ultraviolet lithography and reactive ion etching. The microregion of filter array is measured by fiber optic spectrometer and atomic force microscope. The results show that the filter array is accurate and effective for the regulation of Fabry-Perot cavity, and the filter periodic structure of 2×2 is realized.
A micro filter array for portable spectrometer was fabricated. Based on the Fabry Perot periodic multilayer dielectric film, a narrow band filter with a central wavelength of 589 nm was designed and fabricated. The bandwidth is about 3.2 nm, the transmittance is more than 60%, and the cutoff is OD3 . The mask is designed based on the selected mobile camera, and the pixel of narrow-band filter is realized by using semiconductor technology such as step lithography and reactive ion etching on the optical film. The optical fiber spectrometer and atomic force microscope (AFM) were used to measure the micro area of the filter array. The results show that the adjustment of the Fabry Perot cavity is accurate and effective. A 4 × 4 filter periodic structure is realized. The filter array with unit size of 3 μm × 3 μm and size of 1280 × 720 is fabricated.
In the process of the license plate photo recognition process, light and external environment are important factors for the clarity of the photo result. We first add a 400nm filter in front of the camera to carry out the experiment, take pictures with ultraviolet rays light and without ultraviolet rays light source irradiation, then add a 390nm filter in front of the camera to perform the same experiment for comparison. Perform comparative analysis and image processing on the experimental shooting results. First, it can be seen from the comparison of the shooting results that the clarity and recognition of the image under the action of the 400nm filter are significantly improved compared with that of the 390nm filter. Second, the image processing is used to analyze the results, which can effectively identify the license plate information. Finally, the license plate is irradiated with micro-nano filter and ultraviolet light source instead of the monitor fill light, so the strong light stimulation to the driver's eyes is avoided, thereby alleviating the short-term ‘light blindness’ phenomenon of the human eyes and reducing the hidden safety hazards when driving.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.