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Field Measurement of Effective Leaf Area Index using Optical Device in Vegetation Canopy

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Optical transfer function measurment facility for aerial survey cameras.

A Bewsher, I Powell

|October 14, 2010

Summary

The upgraded optical transfer function (OTF) measurement facility now offers a more convenient way to test aerial survey cameras. This enhanced system utilizes a linear photodiode array, improving efficiency and accuracy in camera performance evaluation.

Area of Science:

Optical Engineering
Photographic Science

Background:

The National Research Council of Canada developed an optical transfer function (OTF) measurement facility for aerial survey cameras.
The original facility relied on a cumbersome physical scanning mechanism for line spread function (LSF) analysis.

Purpose of the Study:

To upgrade the existing OTF measurement facility for enhanced convenience and efficiency.
To improve the methodology for testing aerial survey camera performance.

Main Methods:

Replaced the physical scanning mechanism with a detector assembly featuring a relay lens and a linear photodiode array.
Implemented a new light source, daylight filter, and computer software package to support the updated detection system.
The facility is based on the line spread function (LSF) technique.

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Main Results:

The upgraded system significantly increases the convenience of OTF measurements.
Several aerial survey cameras, including a standard Zeiss camera, were successfully evaluated using the improved facility.

Conclusions:

The modifications have resulted in a more user-friendly and efficient OTF measurement system.
The enhanced facility provides reliable performance data for aerial survey cameras.