System and method for a self-calibrating non-invasive sensor
OwnerThomas Dietikerinventor
Life of this patent
Estimating the term…
Abstract
A non-invasive emitter-photodiode sensor which is able to provide a data-stream corresponding to the actual wavelength of light emitted thereby allowing calibration of the sensor signal processing equipment and resulting in accurate measurements over a wider variation in emitter wavelength ranges.
Claims18
A self-calibrating sensor system having at least one light source, the self-calibrating sensor system comprising:
- a probe receiving incident light radiation from the at least one light source, the probe including a wavelength sensor comprising:
- a first diode configured to receive short wavelengths from the incident light radiation and produce a first photocurrent signal;
- and
- a second diode configured to receive short wavelengths from the incident light radiation and produce a second photocurrent signal;
- and;
- a calibration circuit in signal communication with the probe, the calibration circuit producing a calibrated signal corresponding to the received incident light radiation at the probe;
- wherein the probe further includes a probe output circuit in signal communication with the calibration circuit, the probe output circuit producing a known sensor probe output signal when the first photocurrent signal and second photocurrent signal are approximately equal in magnitude.
A self-calibrating sensor system having at least one light source, the self-calibrating sensor system comprising:
- first means for receiving incident light radiation from the lightsource, including means for receiving short wavelengths from the incident light radiation and producing a first photocurrent signal, and means for receiving long wavelengths from the incident light radiation and producing a second photocurrent signal;
- means for producing a calibrated signal corresponding to the received incident light radiation at the first means;
- and
- means for controlling the calibration circuit;
- signal producing means
- wherein the first receiving means further includes a second means for producing a known output signal when the first photocurrent signal and second photocurrent signal are approximately equal in magnitude.
A method for self-calibrating a sensor system having at least one light source, the method comprising the steps of:
- receiving incident light radiation from the at least one light source;
- receiving short wavelengths from the incident light radiation;
- at a probe
- receiving long wavelengths from the incident light radiation;
- at the probe
- producing a first photocurrent signal in response receiving short wavelengths from the incident light radiation;
- producing a second photocurrent signal in response to receiving short wavelengths from the incident light radiation;
- comparing the first photocurrent signal to the second photocurrent signal;
- determining the wavelength of the incident light radiation;
- and
- producing a calibrated signal corresponding to the received incident light radiation at the probe.
A computer-readable medium for self-calibrating a sensor system having at least one light source, the computer-readable medium comprising:
- logic configured for receiving incident light radiation from the at least one light source at a probe;
- logic configured for receiving short wavelengths from the incident light radiation at a first diode;
- logic for receiving long wavelengths from the incident light radiation at a second diode;
- logic configured for producing a first photocurrent signal from the first diode in response to receiving short wavelengths from the incident light radiation;
- logic configured for producing a second photocurrent signal from the second diode in response to receiving long wavelengths from the incident light radiation;
- logic configured for producing a calibrated signal corresponding to the received incident light radiation at the probe;
- and
- logic configured for determining the wavelength of the incident light radiation by comparing the first photocurrent signal to the second photocurrent signal.
Dependencies are inferred from the claim text.