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US 4,841,157 AGranted
Optical backscatter turbidimeter sensor
OwnerJohn P. Downing, Jr.inventor
Life of this patent
Estimating the term…
Abstract
There is disclosed a turbidimeter with an optical sensor having an IRED surrounded by four radiation detecting solar cells mounted on a printed circuit board which is encapsulated by a transparent potting material in a cavity of a housing. Additionally, the printed circuit board has a temperature sensor mounted thereon which is utilized by a sensor operating circuit to control the magnitude of the diode energizing current to compensate for variations in component response due to temperature variations.
Claims13
An apparatus for measuring particle concentration in fluids comprising
- a housing having a cavity defining an opening for facing a fluid,
- a printed circuit board adjacent the cavity,
- a radiation emitting diode mounted on the printed circuit board for projecting radiation from the opening into the fluid;
- a plurality of radiation detectors mounted on the printed circuit board adjacent the diode and on at least two different sides of the radiation emitting diode for receiving radiation passing from the fluild into the opening;
- means for preventing radiation emitted by the diode from impinging directly on the detectors such that the detectors respond to radiation reflected by particles in the fluid;
- a potting matereial which is transparent to the radiation emitted by the diode, filling the cavity and encasing the printed circuit board, the diode and the detectors;
- and
- wire means connected to the printed circuit board and extending from the housing for connecting the diode and the detectors to a particle sensor operating and indicating circuit.
5 more elements
An apparatus for measuring particle concentration in fluids. comprising
- a housing having a cavity defining an opening for facing a fluid;
- a radiation emitting diode in the cavity;
- a plurality of radiation detectors in the cavity adjacent the diode and on at least two different sides of the infrared emitting diode;
- means for preventing radiation emitted by the diode from impinging directly on the detectors such that the detectors receive radiation reflected by particles in the fluid;
- a temperature sensor in the cavity;
- a potting material, which is transparent to the radiation emitted by the diode, filling the cavity and encasing the diode, the detectors and the temperature sensor;
- means for energizing the diode to project radiation into the fluid;
- means responsive to electrical signals generated by the radiation detectors for indicating a particle concentration;
- and
- means responsive to electrical signals from the temperature sensor for varying the diode energizing means or the indicating means to eliminate temperature variation of the indicated particle concentration.
7 more elements
Dependencies are inferred from the claim text.