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US 6,662,130 B1Granted
Systems and methods for calibrating a distorted signal with another signal of known calibration
AssigneeSouthwest Research Institute
InventorsHarry Herbert Peel, III, Keith Alan Bartels
Life of this patent
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Abstract
An uncalibrated sensor located at a first location relative to a physical phenomenon is calibrated using a calibrated sensor spaced away from the uncalibrated sensor at a second location relative to the physical phenomenon and a frequency-domain transfer function that relates the physical phenomenon at the second location to the output of the uncalibrated sensor.
Claims18
A method for calibrating an uncalibrated sensor, comprising:
- sensing at a first location a time-varying physical phenomenon using a calibrated sensor to determine an input waveform of the time-varying physical phenomenon at the first location;
- sensing at a second location the time-varying physical phenomenon using the uncalibrated sensor, the uncalibrated sensor outputting an output waveform corresponding to the time-varying physical phenomenon at the second location;
- determining a frequency-domain transfer function that relates the output waveform to the input waveform based on the input and output waveforms;
- determining a calibration coefficient for the uncalibrated sensor based on the determined frequency-domain transfer function;
- and
- determining a calibration constant for the uncalibrated sensor based on the determined calibration coefficient, the input waveform and the output waveform, wherein the determined calibration coefficient and the determined calibration constant calibrate the uncalibrated sensor to the time-varying physical phenomenon at the second location.
3 more elements
A method for calibrating an electronic applanation tonometer, comprising:
- measuring a brachial artery blood pressure with a calibrated oscillometric blood pressure monitor to generate a calibrated oscillometric blood pressure signal;
- measuring a radial artery blood pressure with an uncalibrated electronic applanation tonometer to generate a voltage signal;
- determining a frequency-domain pressure-to-voltage transfer function based on the calibrated oscillometric blood pressure signal and the voltage signal of the uncalibrated electronic applanation tonometer;
- determining a calibration coefficient for the uncalibrated electronic applanation tonometer based on frequency-domain pressure-to-voltage transfer function;
- determining a calibration constant for the uncalibrated electronic applanation tonometer based on the determined calibration constant, the calibrated oscillometric blood pressure signal and the voltage signal, wherein the determined calibration coefficient and the determined calibration constant calibrate the uncalibrated electronic applanation tonometer to the radial artery blood pressure.
2 more elements
Dependencies are inferred from the claim text.