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Mass measuring system

  • US 4,429,574 A
  • Filed: 10/29/1981
  • Issued: 02/07/1984
  • Est. Priority Date: 10/29/1981
  • Status: Expired due to Fees
First Claim
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1. A mass measuring apparatus comprising:

  • a base member;

    a support means including a substantially horizontal surface for supporting a sample mass to be measured, said support means being substantially circular in horizontal cross section, the mass of said support means being distributed so that it increases radially outwardly from the center thereof at a rate greater than the square of the distance from the center;

    spring means connecting said support means to said base member so as to allow substantially only vertical vibrating motion of said support means relative to said base member;

    first transducer means for generating an electrical output signal in response to and representative of said vibratory motion of said support means;

    second transducer means coupled to said support means for vibrating the same in response to said signal to thereby sustain said vibratory motion of said support means;

    electronic circuit means including means for evaluating said signal and for generating a mass signal in response thereto representing the mass of said sample.

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