Method and means for operating logarithmic circuits
AssigneeBeckman Instruments, Inc.
InventorJames R. Brown
Life of this patent
Estimating the term…
Abstract
A method and means for operating log converter circuits in which the method comprises the steps of sequentially conducting to the input of the log converter circuit signals representing a known transmittance (T) of 100% T, 10% T, 1% T, and 0.1% T, these signals covering the range of operation of the log converter circuit, storing the outputs of the circuit as signals representing an absorbance (A) of 0A, 1A, 2A, and 3A, respectively, conducting to the input of the log converter circuit an unknown signal, and utilizing a microcomputer to perform a linear interpolation of the output of the circuit with the unknown signal applied thereto using the previously stored 0A, 1A, 2A, and 3A signals.
Claims18
A method for operating a log converter circuit comprising the steps of:
- sequentially conducting signals to the input of said log converter circuit, each signal representing a known transmittance of light through a sample, said signals being spaced within the range of operation of said log converter circuit;
- storing the resultant outputs of said circuit as signals representing equivalent absorbances;
- conducting to said input of said circuit an unknown signal;
- and
- comparing the resultant unknown output of said circuit with said unknown signal applied thereto with the stored outputsto determine the value of said unknown output.
A method for operating a log converter circuit comprising the steps of:
- sequentially conducting at least two signals to the input of said log converter circuit, each of said input signals having a known value, said signals being spaced within the range of operation of said log converter circuit;
- storing the resultant outputs of said circuit as output signals having known values;
- conducting to said input of said circuit an input signal having an unknown value;
- and
- comparing the resultant unknown output of said circuit with said unknown signal applied thereto with the stored outputs to determine the value of said unknown output.
Apparatus for operating a log converter circuit comprising:
- means for sequentially conducting at least two input signals to the input of said log converter circuit, each of said input signals having a known value, said signals being within the range of operation of said log converter circuit;
- means for storing the outputs of said circuit as output signals having known values;
- means for conducting to said input of said circuit an input signal having an unknown value;
- and
- means for comparing the unknown output signal of said circuit with said unknown input signal applied thereto with the stored output signals to determine the value of said unknown output signal.
Dependencies are inferred from the claim text.