发明授权
- 专利标题： Fault detector for paper webs
- 专利标题（中）： 纸巾故障检测仪
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申请号： US41114673申请日： 1973-10-30
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公开(公告)号： US3859538A公开(公告)日： 1975-01-07
- 发明人: MANNONEN PENTTI
- 申请人： STROEMBERG OY AB
- 专利权人： Stroemberg Oy Ab
- 当前专利权人： Stroemberg Oy Ab
- 优先权： US41114673 1973-10-30; FI328772 1972-11-22; US35570473 1973-04-30
- 主分类号： G01N21/89
- IPC分类号： G01N21/89 ; G01N21/20
摘要：
The invention relates to an amplification circuit for a photoelectric device - for example, a phototransistor - whereby the output from such circuit is responsive to percentage changes in the light incident upon said device rather than absolute changes therein or in the condition of the circuit. The device is connected in series with a diode junction across a potential supply and the current passing therethrough controls the bias applied to a transistor connected across a potential supply and having diode junction characteristics similar to those of the first-named junction. The output signal from the circuit is thus dependent upon the current flow through the transistor, which is controlled by the bias applied thereto. Also disclosed and claimed is the application of the circuit to a web fault detector apparatus.
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