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Photo-electric Measurement of Douglas Fir Needle Area

 

作者: M. B. Balderston,  

 

期刊: Canadian Journal of Forest Research  （NRC Available online 1972）
卷期: Volume 2, issue 3  

页码: 374-376

 

ISSN:0045-5067

 

年代: 1972

 

DOI:10.1139/x72-057

 

出版商: NRC Research Press

 

数据来源: NRC

 

摘要:

A photo-electric device suitable for determining projected area of up to 60 Douglas fir needles at a time is described. Arrangement of the light source, lens, and selenium cell, and the method of operation, were designed to take into account seven points considered important for satisfactory measurements.

 

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