Electronic architecture for coded light target analysis
AssigneeEmcode Photonics LLC
InventorShrenik Deliwala
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Abstract
An electronic interface device is configured for use with associated optics for employing coded light for illuminating a liquid, gaseous, or other analyte or target, such as for measuring or determining a composition or other property of the analyte or target. The arrangement can help enable a far higher level of performance, such as for spectral analysis, imaging, or both. A shared common clock on both the illumination and receive sides of the system can be included, such as together with one or more of reference detection, per-channel wavelength-dependent modulation, multiple concurrent feedback loops at different levels, orthogonal and circulant codes, phase-scrambling to better utilize ADC dynamic range, oversampling, and other signal processing can be provided.
Claims30
An electronic interface device to an optical system to provide the optical system with electrical signals to control the optical system to produce an illumination combining multiple modulation coded light sources using modulation codes generated by the electronic interface device, and to provide signal conditioning for a photodetector that is included in or coupled to the optical system to receive combined modulated response light and to provide a response signal, including to decode the codes to measure one or more properties of a liquid, gaseous, or other analyte or target, the electronic interface device comprising:
- a multi-channel excitation circuit, including multiple excitation inputs to respectively receive corresponding individually modulated digital electrical excitation input signals and a digital-to-analog converter (DAC) to, in response, respectively provide via corresponding excitation channels corresponding individually modulated analog electrical excitation output signals to respective electrical-to-optical modulators corresponding to the excitation channels, wherein the electrical-to-optical modulators are configured to concurrently provide, in response, individually modulated optical excitation channel illumination signals that are combined into a combined modulated optical output illumination for directing toward the analyte or target;
- a low-noise amplifier, coupled to the photodetector to receive the combined modulated electrical response signal and to provide an amplified combined modulated electrical response signal;
- an analog-to-digital converter (ADC), coupled to the low-noise amplifier to receive the amplified combined modulated electrical response signal and to provide in response a digitized combined modulated electrical response signal;
- and
- a processor, coupled to the excitation circuit to provide the individually modulated digital electrical excitation input signals in synchronization with a common clock signal, and coupled to the ADC to receive and demodulate the digitized combined modulated electrical response signal in synchronization with the common clock signal to provide demodulated components corresponding to the excitation channels, and configured to analyze at least some of the demodulated components to measure a property of the analyte or target.
An electronic interface device to an optical system to provide the optical system with electrical signals to control the optical system to produce an illumination combining multiple modulation coded light sources using modulation codes generated by the electronic interface device, and to provide signal conditioning for a photodetector that is included in or coupled to the optical system to receive combined modulated response light and to provide a response signal, including to decode the codes to measure one or more properties of a liquid, gaseous, or other analyte or target, the electronic interface device comprising:
- a multi-channel excitation circuit, including multiple excitation inputs to respectively receive corresponding individually modulated digital electrical excitation input signals and a digital-to-analog converter (DAC) to, in response, respectively provide via corresponding excitation channels corresponding individually modulated analog electrical excitation output signals to respective electrical-to-optical modulators corresponding to the excitation channels, wherein the electrical-to-optical modulators are configured to concurrently provide, in response, individually modulated optical excitation channel illumination signals that are combined into a combined modulated optical output illumination for directing toward the analyte or target;
- a low-noise amplifier, coupled to the photodetector to receive the combined modulated electrical response signal and to provide an amplified combined modulated electrical response signal;
- an analog-to-digital converter (ADC), coupled to the low-noise amplifier to receive the amplified combined modulated electrical response signal and to provide in response a digitized combined modulated electrical response signal;
- and
- a processor, coupled to the excitation circuit to provide the individually modulated digital electrical excitation input signals in synchronization with a common clock signal, and coupled to the ADC to receive and demodulate the digitized combined modulated electrical response signal in synchronization with the common clock signal to provide demodulated components corresponding to the excitation channels, and configured to analyze at least some of the demodulated components to measure a property of the analyte or target;
- and
- wherein the electronic interface device and the optical system are packaged together to be worn on skin of a human subject to detect at least one of blood oxygenation, hematocrit, glucose, lactic acid, alcohol, HbA1c, or temperature of the subject.
Dependencies are inferred from the claim text.