4 results about "Grating light valve" patented technology

The application discloses a closed-loop control direct-current fiber current sensor, which comprises a grating light valve type fiber direct-current current sensor and a polarization interference type fiber temperature sensor; the polarization interference type fiber temperature sensor and the sensing head of the grating light valve type fiber direct-current current sensor are integrated in the same shell; the temperature at the primary sensing head of the grating light valve type fiber direct-current current sensor is measured through the polarization interference type fiber temperature sensor; error correction is carried out according to the measured temperature information; and the influence of the environmental temperature change on the measurement accuracy of the grating light valve type fiber direct-current current sensor is corrected. Meanwhile, the micro-power light control signal source technology is adopted to realize the closed-loop light feedback control of the grating light valve type fiber direct-current current sensor, the measurement linearity of the grating light valve type fiber direct-current current sensor is improved in the closed-loop demodulation algorithm, and the dynamic measurement range is increased.

An object build area is exposed to a radiation beam, such as a laser light source, which has been processed and controlled through a grating light valve or valves, or planar light valve, to thereby melt, sinter, fuse or cure predetermined portions of the build area corresponding to the equivalent of individually controlled pixels, with rapid movement and positioning of the resulting LV application output array on the build area. The LV arrangement is adapted to also generally heat an entire powder bed, or targeted areas of the bed, to just below melting temperature.

An OSC material may include a grating structure for use in waveguide applications. A method of patterning the OSC material to create the grating structure may include forming a hard mask over the OSC layer and etching the OSC layer through an opening in the hard mask. Furthermore, an improved design of a grating light valve device may include a reflective backplane, an array of micro-ribbons disposed on the reflective backplane, and a metasurface structure positioned beneath the array of micro-ribbons. A multiple stage process may include generating a broad spectrum of light from a laser architecture, filtering and multiplexing the wavelengths of light using an image optimization module, and incoherently averaging the speckle patterns across the various wavelengths using a spatial light modulator architecture.

This application discloses a grating light valve array and its fabrication method. The grating light valve array includes: a substrate; a one-dimensional cantilever array disposed above the substrate, wherein the one-dimensional cantilever array adopts a multi-row, multi-column cantilever array, each row of the cantilever array includes multiple sets of cantilever pairs that are equally spaced and parallel to each other, and the number of cantilever pairs in each row of the cantilever array is the same, and multiple cantilever pairs in the same column of different rows are electrically connected sequentially; the absolute value of the difference between the overall horizontal length and the overall vertical length of the multi-row, multi-column cantilever array is less than a preset threshold; and a driving circuit for applying voltage to each cantilever pair to cause the cantilever pair to deform and generate a height difference, wherein the driving circuit applies the same voltage to the cantilever pairs in the same column of different rows. The grating light valve array and its fabrication method of this application can reduce the difficulty of focusing and spot shaping in grating light valve illumination.