Abstract: A concurrently measuring multiple light input spectrometer with a shared or common optical path is described. The spectrometer can help eliminates errors from dark offsets, can reduce impact of ambient optical and electrical noise, and can mitigate temperature effects. Additionally, it can help readily provide wavelength calibration. By using just two inputs, spectrometer can provide true spectral measurement of the test object by continuous measurement of the spectra of the source and the spectra of the source light after interacting with the test object. More generally, including an individual photodetector (instead of an array of multiple photodetectors) associated with each input can help address solving the problems that may get introduced by using multiple photodetectors for a particular input.

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.

Abstract: Modulation-encoded light, using different spectral bin coded light components, can illuminate a stationary or moving (relative) target object or scene. Response signal processing can use information about the respective different time-varying modulation functions, to decode to recover information about a respective response parameter affected by the target object or scene. Electrical or optical modulation encoding can be used. LED-based spectroscopic analysis of a composition of a target (e.g., SpO2, glucose, etc.) can be performed; such can optionally include decoding of encoded optical modulation functions. Baffles or apertures or optics can be used, such as to constrain light provided by particular LEDs. Coded light illumination can be used with a focal plane array light imager receiving response light for inspecting a moving semiconductor or other target.