公开(公告)号：US4823008A

公开(公告)日：1989-04-18

申请号：US116987

申请日：1987-11-05

Applicant: Steven P. Sturm

Inventor： Steven P. Sturm

IPC: G01N21/31 ,  G01N21/35 ,  G01N21/86 ,  G01N33/34

CPC classification number: G01N21/86 ,  G01N21/3559 ,  G01N33/346 ,  G01N2021/3148 ,  G01N2021/8663 ,  G01N2201/1211

Abstract: Apparatus and methods for use in measuring the moisture content of heavy-grade sheets of paper during their continuous manufacture. In one aspect, means employing infrared absorption techniques for determining the fiber weight per unit area of a sheet having a fiber weight of up to 1100 grams per square meter are provided. In another aspect, means employing infrared absorption techniques including the use of two moisture absorption bands and associated moisture reference bands for calculating the average temperature of the sheet are provided. The latter aspect may be used to produce an indication of moisture weight per unit area, wherein the indication is substantially independent on changes in the average temperature, and enables accurate measurement of the moisture weight per unit area of heavy grades of paper having moisture weights of up to 450 grams per square meter. The former aspect may be employed in measuring the moisture content of heavy grade of paper having moisture weights of up to 90 grams per square meter.

公开(公告)号：US4733078A

公开(公告)日：1988-03-22

申请号：US899611

申请日：1986-08-25

Applicant: Steven P. Sturm

Inventor： Steven P. Sturm

IPC: G01N21/35 ,  G01N21/86 ,  G01N33/34 ,  G01J1/00 ,  G01F23/00

CPC classification number: G01N33/346 ,  G01N21/3559 ,  G01N2021/8618

Abstract: A process and apparatus for measuring moisture content of moisture-stratified sheet material such as paper is disclosed. The effective reflectivities of two areas of an infrared moisture sensor that generally face opposite surfaces of the sheet are made significantly different, so that the sensitivity of the measurement to conditions prevailing in a high-moisture stratum of the sheet is increased.

Abstract translation: 公开了一种用于测量水分分层的片材如纸的含水量的方法和装置。 通常面对片材的相对表面的红外线湿度传感器的两个区域的有效反射率被显着地不同，使得测量对片材的高湿度层中普遍存在的条件的灵敏度增加。