公开(公告)号：EP1161659A4

公开(公告)日：2007-05-02

申请号：EP99954736

申请日：1999-10-05

Applicant: WILT ROBERT ,  TOTH GEORGE E

Inventor： WILT ROBERT ,  TOTH GEORGE E

IPC: G01J5/08 ,  G01J3/02 ,  G01J3/10 ,  G01J3/36 ,  G01J3/427 ,  G01N21/31 ,  G01N21/35 ,  G01N21/86

CPC classification number: G01N21/35 ,  G01J3/02 ,  G01J3/0218 ,  G01J3/0264 ,  G01J3/027 ,  G01J3/0291 ,  G01J3/10 ,  G01N21/359 ,  G01N21/86

Abstract: A method and device for high speed spectroscopic constituent verification. The method includes the steps of illuminating the sample with broadband light and measuring two preselected wavelenghts of reflected light: a first narrow-range of wavelenghts lambda 1 that is not significantly absorbed by the constituent of interest, and a second narrow-range of wavelengths lambda 2 that is substantially absorbed by the constituent of interest. Given the two measurements of reflection, upper and lower thresholds are determined, the latter based on a percentage of the measured baseline reflected light of wavelengths lambda 1. Finally, the presence of the constituent of interest is indicated if the measure of reflected discriminant wavelength lambda 2 is within the upper and lower threshold measures of reflected baseline light lambda 1. The compact device that implements the above described method includes a base unit (10) housing a near-IR discriminator circuit with a pair of selective light sensors and a light source. A sensor unit connects to the base unit (10). The sensor unit includes a flexible neck (20) with a connecting block (24) attached at one end for mating with the base unit (10), and a hood assembly (30) attached at the other end for enclosing a light collecting and transmitting lens (32). The optics are connected by an optical fiber bundle inside the flexible neck.