Wedge Prism
Prism (Optics), Index Of Forestry Articles, Outline Of Forestry
978-613-9-05159-5
6139051592
140
2013-08-15
39,00 €
eng
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The wedge prism is a prism with a shallow angle between its input and output surfaces. Refraction at the surfaces causes the prism to deflect light by a fixed angle. When viewing a scene through such a prism, objects will appear to be offset by an amount that varies with their distance from the prism.A pair of wedge prisms, called a Risley prism pair, can be used for beam steering.The wedge prism is primarily used as an angle gauge in variable-radius plot sampling. The wedge prism can be used, “To rapidly establish fixed-radius plots in the field, common forest survey techniques can be used with a target object calibrated to the desired size of the plot…Wedge prisms used with a 10.2-cm PVC pipe or cylinder were accurate, precise, inexpensive, and easy to use”. In forestry, the wedge prism is used to record and calculate basal area of a stand via a timber cruise known as tree inventory. Because the wedge prism refracts light to offset the object of interest (ex. A tree).
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