Turbidity
Turbidity is the cloudiness of water due to suspended particles
(gravel, sand, silt, clay, algae)
(settled/suspended)
Turbidity limits sunlight and alters the photosynthetic activity of plants and algae. Thus leading to plant die-off, oxygen depletion and fish kills
ISO 7027 Nephlometric Sensor
LED at 860nm wavelength sends light down an optical fiber and into the water
Optical fibers are set at an included angle of 90 degrees
Light scatters off the particles
Light that is scattered at 90 degrees is measured by the photo diode
Sunlight is rejected by measuring the photo diode signal with the LED on and off
Units of measure
NTU (Nephelometric Turbidity Units)
low turbidity, high turbidity
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