Patent · US Expired

Backscatter instrument for monitoring particulate levels in a gas stream

US6476911B1 · kind B1 · utility

9Cited by
7References
20Claims
0Family size

Inventor

Key dates

Filing dateFeb 20, 2001
Grant dateNov 5, 2002
Priority date—
Expiry dateFeb 20, 2021

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG01N2015/0096
  • WIPO fieldMeasurement
  • WIPO sectorInstruments

Abstract

An automatic setup backscatter particulate monitor includes a small source (38) of narrow beam radiant energy directed into a gas stream containing particulates. A lens (34) that is mounted behind the radiant energy source (38) collects the energy reflected back from the particulates and concentrates it on a photodetector (48). The beam is directed into duct at an angle greater than twice the beam spread, minimizing reflection off opposing wall surfaces. Internal radiant energy sources are periodically directed to the detector to verify system integrity. Backscattered energy is corrected for energy reflected from the opposite stack wall and for ambient energy.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.