Featured Application: This proof-of-concept work might find applications as programmable zoom systems for imaging systems or holographic projection systems, when applied with newer high resolution SLMs.Abstract: In this work we present an experimental proof of concept of a programmable optical zoom lens system with no moving parts that can form images with both positive and negative magnifications. Our system uses two programmable liquid crystal spatial light modulators to form the lenses composing the zoom system. The results included show that images can be formed with both positive and negative magnifications. Experimental results match the theory. We discuss the size limitations of this system caused by the limited spatial resolution and discuss how newer devices would shrink the size of the system.
A dendrometer that utilises a single turn rotary potentiometer linked to a girth band is described. The dendrometer system is simple in construction, relatively inexpensive and capable of accurate measurement of small changes in stem dimensions. It can be applied to a wide range of stem sizes from 25mm diameter upwards to large tree boles.
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