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1958年2月加拿大安大略采矿协会(O.M.A.)与有关单位合作,制成了一种与南非所用相仿的电磁钢绳检验仪。随后在该地区各矿山按计划进行了大量试验,至1962年10月已确定此仪器的性能,并在该区正式应用。工作原理如图1所示,检验仪包括一个线圈与一个测量记录仪。在测录仪中有一个振荡器产生27或80周/秒的电流,流经环绕钢绳的单匝线
February 1958 O.M.A. of Ontario, Canada, in cooperation with the relevant agencies, made an electromagnetic steel cord tester similar to that used in South Africa. Subsequent large-scale experiments were carried out in various mines in the area as planned. By October 1962, the performance of this instrument was confirmed and formally applied in the area. Working principle shown in Figure 1, the tester includes a coil and a measuring recorder. An oscillator in the recorder produces a current of 27 or 80 cycles per second flowing through a single turn of wire