Abstract
A method of employing space-periodic magnetoresistive transducers for the direct measurement of the speed of magnetic recording tape is described. The method is, in principle, similar to that devised for measuring strip speed in steel mills, using an inductive transducer. The wavelength-selective transducer is connected in a feedback configuration to an inductive write head placed upstream of the transducer, and the system records an ideally constant-wavelength pattern on the tape, so that the frequency of the transducer output is a direct measure of the tape speed. A digital variable delay line is used to compensate for slight variations in the recorded wavelength caused by variable phase delays encountered in the feedback loop. The error in the speed measurement is less than 0.1%. Three different experimental transducers are investigated, each of which is less than 2 mm long and utilises trackwidths of 100 μm or less.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
