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Could the testing frequency be higher than the inductive sensor's resonant frequency?

user1384456
Prodigy 20 points
Other Parts Discussed in Thread: LDC1612, LDC1101

When I use an inductive sensor(like the eddy current sensor) to measure a vibration, if the vibration frequency is higher than the sensor's resonant frequency, what will happen about the ouput of the sensor?

What I mentioned above are all about the analog signals.

Thanks!

  • 0
    TI__Genius 13650 points

    Hello,

    sensor frequency can be chosen by choosing appropriate LC components (up to 10MHz on LDC1612 or LDC1101). Each device restricts the relationship between the sensor oscillation frequency and the reference clock. For example, figure 11 and table 2 of the LDC1612 datasheet specify that fin_x must be smaller than fref_x/4.

    However, the sample rate of the LDC must also support the measured frequency to avoid under sampling. Our fastest device, the LDC1101, can sample up to 180ksps, so vibrations should not exceed 90kHz. Many vibration sensing applications require higher sample rates than those that our LDCs currently offer. 

  • 0 in reply to Ben Kasemsadeh
    Prodigy 20 points
    Hello Ben,

    Thank you very much for your explanation!

    Best regards!
    Jing