Precision Measurement Engineering, Inc. The Laser Turbidity
sensor is designed to be used with SCAMP's fluorometer. The
sensor is shown in the picture below. It is the black cylinder
located at the center of the end cap, amoung the other sensor
sealing nuts. The Laser Turbidity sensor operates in a similar
way to the other SCAMP Turbidity sensor. The sensor housing is
shown in the following drawing. The sensor emits pulsed infrared
light from a laser diode located in the cavity shown. These
light pulses illuminate the water directly outside above the
cavity. The photo diode detector within the cavity shown views a
small section of the illuminated volume. If particles
(turbidity) are present in the viewed volume then some of the
light will be scattered into the photo diode and detected. The
small electrical signal that results is amplified and recorded
within SCAMP. The turbidity sensor components and electronic
circuit are supplied to PME by D&A Instruments. The housing
shown above is manufactured by PME and