Title: Electronic gram weight tester for non-metal material
Application Number: 90103179 Application Date: 1990.06.26
Publication Number: 1057906 Publication Date: 1992.01.15
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G01N9/00,G01N27/22
Applicant(s) Name: Hebei Mechanoelectric College Address: 050054
Inventor(s) Name:
Attorney & Agent: YANG QIEXIANG
Abstract:
     This invention relates to a test device for thin type nonmetal material gram-weight value (g/m square). Its main test circuit is composed of amplitude-stabilization and frequency-stabilization oscillator, main amplifier, pole plate type capacitor sensor, drive shield layer circuit, rectifying filter circuit and monolithic microcomputer. The pole plate type capacitor sensor uses double layer shield structure, hence its anti-interference ability is strong, precision is higher and has no relation with the length of cable of capacitor. This device is suitable to on line measuring of automatic production line of materials, such as paper, plastic membrance, film or knitting cloth, and is also suitable to static loss-less lest and displays gram weight value directly.
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