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Auto-ranging glucose measuring system

  • US 3,937,615 A
  • Filed: 12/17/1974
  • Issued: 02/10/1976
  • Est. Priority Date: 12/17/1974
  • Status: Expired due to Term
First Claim
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1. A system for measuring a characteristic of a solution in which the relationship between a measured variable and the characteristic includes linear and non-linear portions and in which it is desired that the measurement occur in said linear portion comprising:

  • a source of said solution the characteristic of which is to be measured,modifying means having an inlet to receive said solution for modifying the characteristic of said solution and an outlet,measuring means coupled to the output of said modifying means for producing an electric signal output responsive to the characteristic of said solution,a settable upper limit device for said electrical signal,a settable lower limit device for said electric signal, the difference between said upper and lower limits defining a usable span representing said linear portion of said relationship,means responsive to said upper and lower limit devices to vary said mdoifying means to maintain said electric signal representative of the characteristic of said solution within said linear portion of said relation, andindicating means associated with said responsive means for indicating the extent that said characteristic is modified by said modifying means whereby the magnitude of said characteristic of said solution may be determined jointly from said measuring means and said indicating means.

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