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AssigneeJuergen Hartmann
InventorsJuergen Hartmann, Jochen Kuhn
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Device (1) for manually measuring the frequency of vibrations on a tight drive belt (6, 6′, 6″), comprising a Doppler radar module (3) which uses a transmit antenna (4) for emitting a transmit beam (8) onto a vibrating surface of the drive belt (6, 6′, 6″) as well as a receive antenna (5) for receiving the receive beam (9) reflected by the surface and evaluates the receive beam (9) according to the Doppler principle, the vibration sensor (1) also comprising an acceleration sensor (10) in addition to the Doppler radar module (3), the signals of the acceleration sensor (10) being calculated along with the signals of the Doppler radar module, thus allowing some signals to be disregarded.
A device for the hand-held measurement of vibration frequencies on a tight drive belt with a Doppler radar module that transmits a transmit beam using a transmit antenna against a vibrating surface of the drive belt and receives, using a receive antenna, a receive beam reflected from the surface and evaluates the receive beam according to the Doppler principle, wherein in the device apart from the Doppler radar module an acceleration sensor is additionally provided that produces pulses upon acceleration so that if a pulse of the Doppler radar is detected and at the same time a pulse of the acceleration sensor is detected, the pulse of the Doppler radar is disregarded as a faulty impulse.
A method for operating a hand-held device for carrying out a vibration frequency measurement on a tight and vibrating drive belt with a Doppler radar module that transmits, using a transmit antenna, a transmit beam against a vibrating surface of the tight a vibrating drive belt and receives, using a receive antenna, a receive beam reflected from the surface and evaluates the receive beam according to the Doppler principle, wherein from an analogue level of the Doppler radar module, by using a switching threshold, digital pulses that are temporally offset relative to each other are derived, the mutual time distance of which is a measure of the time of the pulses, and from this the frequency of the tight and vibrating drive belt is derived, provided that an acceleration sensor that generates levels upon acceleration does not generate a level that coincides with one of the pulses of the Doppler radar module, and thus the pulse of the Doppler radar sensor is disregarded because the hand-held device was briefly moved during the measurement.
Dependencies are inferred from the claim text.