초록

An optical probe for sensing presence of small moving particles passing through a defined sensing region comprises:

대표청구항 ▼

[ We claim:] [1.] An optical probe for sensing presence of small moving particles passing through a defined sensing region, said probe comprising:i) an emitter optic fibre for transmitting from its tip radiant energy outwardly of said probe;ii) a receptor optic fibre for receiving radiant energy ref

[ We claim:] [1.] An optical probe for sensing presence of small moving particles passing through a defined sensing region, said probe comprising:i) an emitter optic fibre for transmitting from its tip radiant energy outwardly of said probe;ii) a receptor optic fibre for receiving radiant energy reflected or emitted by such particles moving through said sensing region;iii) a lens for focusing radiant energy emitted from said emitter tip into a focal region spaced outwardly of said probe and which radiant energy diverges outwardly from said focal region into a defined high density radiant energy region,iv) said receptor optic fibre defining a diverging viewing region projecting outwardly towards said high density radiant energy region, said receptor optic fibre being positioned relative to said lens to project said viewing region to overlap a useful portion of said high density radiant energy region to define thereby said sensing region.