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Turbidimeter utilizing back scatter

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TLDR
A turbidimeter having a probe mounted in a single opening in a fluid flow line which has a smooth uniform face in contact with the flowing fluid, a collimated incident light source and a photosensitive cell positioned to receive back scatter light was used in this paper.
Abstract
A turbidimeter having a probe mounted in a single opening in a fluid flow line which has a smooth uniform face in contact with the flowing fluid, a collimated incident light source and a photosensitive cell positioned to receive back scatter light

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Low-cost on-line and in-line spectral sensors based on solid-state source and detectors combinations for monitoring lubricants and functional fluids

TL;DR: In this article, a series of optical spectral sensors is based on a combination of solid-state sources and detectors, which are integrated within an integrated package that includes the interfacing optics and acquisition and processing electronics.
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Integrated sensing module for handheld spectral measurements

John Coates
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Method and apparatus for particulate monitoring

TL;DR: In this paper, a two-dimensional multiple sensor radiation detector is used for real-time monitoring of particle-containing fluid, where back-scattered radiation from the particles generating electrical pulse signals representative of individual particle size and number, and determining particle size distribution as a function of signal pulse height.
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An integrated sensing system approach for handheld spectral measurements

John Coates
TL;DR: In this paper, an integrated spectral sensing engine with energy sources and detectors within a single package includes sample interfacing optics and acquisition and processing electronics for specific laboratory and field-based measurements by integration into a handheld format.
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Underwater light scattering sensor

Robert Bartz
TL;DR: In this paper, an underwater light scattering sensor includes a light source, light stop and a light detector mounted on a planar support capable of measuring nearly all suspended particle concentrations found in natural waters, 1 μg/l to 3 g/l.
References
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Patent

Turbidity meter having calibrating light source

TL;DR: In this article, a photoelectric turbidity measurement system is presented for measuring turbidity of a fluid in a flow through a pipe with a light source and a pair of photocells.
Patent

Apparatus for measuring turbidity photoelectrically

TL;DR: In this article, a method for determining the turbidity of substantially colorless liquids of very low dispersed particle content and of liquids so highly colored as to partially mask turbidity was proposed.