SG Designs - micro, power, photodiode, light, meter, mechanical, design

Electronic Product Design Services

Precision Light Meter

Photo Therapeutics produce medical photodynamic treatment lamps used to treat skin cancer. The light dosage needs to be accurately monitored. Therefore each lamp is provided with a power meter. Photo Therapeutics asked SG Designs to design the complete product including the electronics, optical parts and enclosure.

Precision Light Meter

The light meter is based around a precision photodiode amplifier and expanded scale bargraph. The circuit powers up automatically when a certain light level is sensed. Micro power design techniques ensure 7 years' battery life from a single AA cell.

The PCB slides into the enclosure and is accurately aligned with the optical assembly.

The PCB is enclosed in a CNC machined aluminium assembly designed by SG Designs. The white nylon part inside the right hand aluminium piece is the optical assembly which diffuses the measured light and corrects the spectral response for different operating wavelengths.

Precision Light Meter
Precision Light Meter
Precision Light Meter