公开(公告)号：WO1992009881A1

公开(公告)日：1992-06-11

申请号：PCT/US1991008943

申请日：1991-11-27

Applicant: NIRSYSTEMS INCORPORATED

Inventor： NIRSYSTEMS INCORPORATED ,  McGEE, Philip, A. ,  VONBARGEN, Kenneth, Paul

IPC: G01N21/47

CPC classification number: G01N21/474 ,  G01N21/359 ,  G01N21/8507 ,  G01N2021/4742

Abstract: In an optical instrument for infrared spectral analysis of powder, an improved fiber optic probe is provided. Fiber optics (13, 17) carry light to an from the probe (15) and the fiber optics terminate in the probe in a fiber optic endface (20). A sapphire road (23) is positioned to about the fiber optic endface (20). The sapphire rod (23) has a distal endface (24) arranged at slightly less than one-half the maximum acceptance angle of the optic fibers in the probe.