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1.发明授权
公开(公告)号：EP0635120B1
公开(公告)日：1997-12-17
申请号：EP93909269.8
申请日：1993-04-12
IPC分类号： G01H9/00
摘要： An optical system for monitoring torsional vibration of a shaft (112) has an optical unit (104) including IRLED radiation sources (208) aimed at grid lines (114) applied around the circumference of the shaft (112). The reflection of the radiation is imaged through lenses (204) and a matching Ronchi grid (218) onto a photodiode (220) which produces a periodic wave signal from which indications of rotational irregularities can be derived. In one embodiment, duplicate optical units (104) are arranged in diametric opposition across the shaft (112) to compensate for pitch and plunge vibration. In another embodiment, a second duplicate optical unit (104) is located at a distance along the shaft from the first unit (104). The output signals of the two units (104) are passed through a comparator (406), an EX-NOR gate (430) and a low-pass filter (432) to produce a signal indicative of torsional deflection. Also disclosed are a method and apparatus for precisely applying finely spaced grid lines (114) to an existing shaft (112) on site.
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2.发明公开SYSTEM AND METHOD FOR MONITORING TORSIONAL VIBRATIONS AND OPERATING PARAMETERS OF ROTATING SHAFTS 失效方法和监测系统的扭转振动和转动轴的操作参数。
公开(公告)号：EP0635120A1
公开(公告)日：1995-01-25
申请号：EP93909269.0
申请日：1993-04-12
摘要： An optical system for monitoring torsional vibration of a shaft (112) has an optical unit (104) including IRLED radiation sources (208) aimed at grid lines (114) applied around the circumference of the shaft (112). The reflection of the radiation is imaged through lenses (204) and a matching Ronchi grid (218) onto a photodiode (220) which produces a periodic wave signal from which indications of rotational irregularities can be derived. In one embodiment, duplicate optical units (104) are arranged in diametric opposition across the shaft (112) to compensate for pitch and plunge vibration. In another embodiment, a second duplicate optical unit (104) is located at a distance along the shaft from the first unit (104). The output signals of the two units (104) are passed through a comparator (406), an EX-NOR gate (430) and a low-pass filter (432) to produce a signal indicative of torsional deflection. Also disclosed are a method and apparatus for precisely applying finely spaced grid lines (114) to an existing shaft (112) on site.
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