Apparatus and method for measuring the concentration of solid particles in a fluid stream
First Claim
1. Apparatus for measuring the concentration of solid particles in a fluid stream, said apparatus comprising:
- means for producing a sub-stream of fluid, means for producing a substantially constant velocity in said sub-stream which is independent of the velocity of said fluid stream;
a triboelectric charging surface disposed such that particles in said sub-stream can impact upon said surface, thereby effecting triboelectric charging of said particles impacting upon said surface; and
charge measuring means for measuring the charge produced on said particles by said impacts.
1 Assignment
0 Petitions
Accused Products
Abstract
Apparatus for measuring the concentration of solid particles in a fluid stream wherein a critical flow orifice produces a stream of fluid having a constant velocity, a surface for effecting triboelectric charging of the particles in the gas in the constant velocity stream and a charge measuring device for measuring the charges thus triboelectrically imparted to the particles. The apparatus overcomes the inaccuracies which occur in prior art particle detectors when such particle detectors are used to monitor fluid streams whose velocity is variable e.g. air intake systems for internal combustion engines which operate at varying speeds.
48 Citations
22 Claims
-
1. Apparatus for measuring the concentration of solid particles in a fluid stream, said apparatus comprising:
-
means for producing a sub-stream of fluid, means for producing a substantially constant velocity in said sub-stream which is independent of the velocity of said fluid stream; a triboelectric charging surface disposed such that particles in said sub-stream can impact upon said surface, thereby effecting triboelectric charging of said particles impacting upon said surface; and charge measuring means for measuring the charge produced on said particles by said impacts. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
-
-
20. A method for measuring the concentration of solid particles in a fluid stream which is susceptible to changes in velocity, said method comprising:
-
producing a sub-stream of said fluid having a substantially constant and independent velocity; permitting said sub-stream to come into contact with a triboelectric charging surface, thereby effecting triboelectric charging of said solid particles in said sub-stream; and thereafter measuring the charge produced upon said particles by their impacts on said triboelectric charging surface. - View Dependent Claims (21, 22)
-
Specification