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    Method and apparatus for in-situ measurement of head/recording medium clearance
    3.
    发明授权
    Method and apparatus for in-situ measurement of head/recording medium clearance 失效
    用于原位测量头/记录介质间隙的方法和装置

    公开(公告)号：US4777544A

    公开(公告)日：1988-10-11

    申请号：US897180

    申请日：1986-08-15

    申请人： Byron R. Brown ,  Hung L. Hu ,  Klaas B. Klaassen ,  Joseph J. Lum ,  Jacobus C. L. Van Peppen ,  Walter E. Weresin

    发明人： Byron R. Brown ,  Hung L. Hu ,  Klaas B. Klaassen ,  Joseph J. Lum ,  Jacobus C. L. Van Peppen ,  Walter E. Weresin

    IPC分类号： G01B7/00 ,  G11B5/00 ,  G11B5/012 ,  G11B5/60 ,  G11B21/21 ,  G11B27/36 ,  G11B21/02

    CPC分类号： G11B5/012 ,  G11B27/36 ,  G11B5/6029 ,  G11B2005/001 ,  G11B2005/0013

    摘要： A method and apparatus for measuring the flying height of a slider supporting a magnetic transducer in-situ in a direct manner in an operational magnetic disk storage system. The method and apparatus produce relative motion between the magnetic transducer and a magnetic recording medium at a first velocity so that the resulting air bearing positions the magnetic transducer slider at a first flying height from the magnetic medium. A single signal of constant periodicity is written over a predetermined area of the recording medium by the magnetic transducer, and a readback signal is sensed from the predetermined area of the recording medium to produce a first signal. The flying height of the magnetic transducer slider is lowered to substantially zero, and a readback signal is sensed at the lowered flying height to produce a second signal. The first flying height is then calculated as the ratio, expressed in decibels, of the first and second signals times the wavelength divided by a constant. In an alternate embodiment a plurality of signals are recorded and readback signals are simultaneously sensed at two separate wavelengths. In a further embodiment, a signal is recorded which has a spectral content comprising a plurality of different frequencies, and readback signals are simultaneously sensed at two separate wavelengths.

    摘要翻译： 一种用于在操作磁盘存储系统中以直接方式现场测量支撑磁换能器的滑块的飞行高度的方法和装置。 所述方法和装置以第一速度在磁换能器和磁记录介质之间产生相对运动，使得所得到的空气轴承将磁换能器滑块定位在距离磁介质的第一飞行高度。 通过磁换能器将恒定周期性的单个信号写入记录介质的预定区域，并且从记录介质的预定区域感测回读信号以产生第一信号。 磁换能器滑块的飞行高度降低到基本为零，并且在降低的飞行高度处感测回读信号以产生第二信号。 然后以第一和第二信号乘以波长除以常数的比率（以分贝表示）计算第一飞行高度。 在替代实施例中，记录多个信号，并且以两个分开的波长同时感测回读信号。 在另一实施例中，记录信号，其具有包括多个不同频率的频谱内容，并且在两个分开的波长下同时感测回读信号。