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1. (WO2017031569) HOLMIUM OXIDE GLASSES AS CALIBRATION STANDARDS FOR NEAR INFRARED MOISTURE SENSORS

Pub. No.:    WO/2017/031569    International Application No.:    PCT/CA2016/000216
Publication Date: Fri Mar 03 00:59:59 CET 2017 International Filing Date: Thu Aug 25 01:59:59 CEST 2016
IPC: G01N 21/3559
Applicants: HONEYWELL LIMITED
Inventors: TIXIER, Sebastien
Title: HOLMIUM OXIDE GLASSES AS CALIBRATION STANDARDS FOR NEAR INFRARED MOISTURE SENSORS
Abstract:
Near infrared moisture sensors using stable holmium oxide glass calibration standards that simulate different moistures levels in paper obviates problems associated with glass encased paper samples. Holmium oxide glass has a strong absorption at 1.93 microns which is close to absorption by paper. Standards can have varying thicknesses to simulate different moisture levels. Didymium glass can also be used with holmium oxide glass. The moisture sensor operates at reference and measurement infrared regions of 1.94 microns and 1.8 microns, respectively.