Sensor Development
Aims
One of the main aspects of the Sound Archive Project is to investigate the optical sensing technology required for non-contact surface measurement of mechanical sound recordings. Aims for sensor development include:
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The improvement of scanning speed : increase data sampling rate from 1KHz to 30KHz.
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Increasing sensor angular tolerance : improve the ability to detect near vertical surfaces.
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Design of optical sensors - including a multi-head sensor array for the flat disc scanner.
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Understanding of systematic errors - including the effects of stand-off distance and inclination.
Investigation
The relationship between surface incline and white light sensor response has been investigated {Ref}. Additionally, the relationship between the average reflected light level and the measured surface distance has been examined. In recent work, a reference sinusoidal surface has been used to compare four different sensing technologies.
White light sensor measurements of reference sinusoidal surface. The measured amplitude is 300 nanometers.
Sensor Head Design
Design of custom sensor heads is a key goal for the Sound Archive Project. The choice of lenses, light source, spot size etc., shall be determined using optical system design software, ZEMAX.