Changguang Chenspu coating technology boosts remote sensing imaging.
In response to the issue of image sensor manufacturers restricting sales of aerospace-grade multispectral chips to China, our company has successfully developed multispectral filters covering 4-, 5-, 9-, and 32-band spectra. Currently, the aerospace-grade multispectral filters we’ve developed have been successfully deployed in several major national satellite programs as well as on the Jilin-1 satellite, yielding exceptionally high-quality image and spectral data.
Multispectral Filter Satellite Project Support—
The multispectral filter is precisely fabricated using a combined lithography and coating process. A high-precision replication lithography technique is employed to create deposition masks, which are then used to deposit high-performance optical filter films for each spectral band. The multispectral filter boasts high transmittance and exceptional filtering characteristics. Multiple filter channels are integrated onto a single substrate with extremely high spatial alignment accuracy. Channel widths and channel gaps can be controlled down to the hundred-micron level. The spectral passband transmittance exceeds 95%, while the out-of-band rejection ratio is below 0.1%. The alignment accuracy of individual spectral channels is better than 2 microns. Moreover, the reflectance in the isolation regions between adjacent spectral channels is less than 3%, and the transmittance is below 0.1%.
Linear Gradient Filter Satellite Project Support—
A linear gradient filter employs a continuous coating process and relies on a multi-layer wedge-shaped thin-film structure to achieve spatially continuous variation in its filtering characteristics. By adjusting the slope of the thin film according to dispersion requirements, the desired linear variation rate can be obtained. Linear gradient filters offer highly integrated spectral separation capabilities and possess irreplaceable advantages in the miniaturization and lightweight design of spectroscopic instruments.
