Use straw or wheat straw to make 20 kg of boiling water and 120 g of soda ash per 100 kg of raw material, cook for 45 minutes, remove and put into cold water, stir and knead, remove, and crush, the finer the better; then stalk The material is put back into the original solution, stirred for more than ten minutes and then filtered with a fine sieve. The filtrate is put into a vat for clarification; after 12 hours, the waste liquid with impurities is removed in the upper layer, and the lower layer of the dope is filled in a cloth bag. Dry is wet starch.
Dove prism is used to rotate, invert, or retroreflect an image, depending upon the prism's rotation angle and the surface through which the light enters the prism. Dove Prisms are fabricated from N-BK7 glass for high transmission from the visible to the near-infrared spectral range.
Dove prisms can be thought of as right-angle prisms with the triangular apex removed, which reduces the weight of the prism and stray internal reflections. They introduce astigmatism when used with converging light, so we recommend using them with collimated light.
Image Rotation
Light is usually propagated along the longitudinal axis of a Dove prism. In this geometry, light reflects once from the bottom face, inverting the image on the other side. Rotation of the prism about the longitudinal axis rotates the image at twice the rate of the prism's rotation. For example, a 20° rotation of the prism results in a 40° rotated image. The AR-coated Dove prisms are designed specifically for the image rotation and inversion application.
Due to the high incidence angle, the light reflecting from the bottom face undergoes total internal reflection, even if the light's propagation axis and the prism's longitudinal axis are not exactly parallel. Hence, in a Dove prism, the magnitude of the internal transmission is limited only by absorption.
Retroreflection
When light is incident on the longest face, the Dove prism acts as a retroreflector or a right-angle prism. The light exits parallel to the input light (independent of the incidence angle) and is inverted by 180°. In situations with limited space or where more convenient mounting options are needed, the Dove prism can replace a retroreflector or right-angle prism.
Custom Coatings
Upon request, our prisms can be AR coated for the UV spectral range , VIS spectral range and IR spectral range.
Dove Prisms,Custom Glass Prisms,Glass Trapezoidal Prism,Dove Prisms Glass Trapezoidal Prism
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