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V. Blazek
Fig. 1.18 Wavelet Transform of a PPG perfusion signal sequence from the earlobe, additionally
the black line is the instantaneous frequency as the inverse of the HRV signal computed by classical
detection of maxima in the time signal
Post-processing of the PPG recordings are facilitated by the fact that no readjustment of DC-compensation has to be performed by the microcontroller. Thanks to the
wide dynamic range of the implemented electronics used, transmission sensors can
also be attached without further hardware or software modification.
Our current PPG measuring & data acquisition concept offers the following
possibilities:
• intelligent front-end sensor concept (using a miniaturized PPG device, without
any controls, executable and manageable via the associated software),
• long term perfusion studies (also 24/7),
• multi-channel and multi-wavelength design,
• full signal-recording (recording of the complete PPG signal without signal
distortion by the filter in the chain),
• 200 measurement values per channel and second,
• 24-bit digitalization precision,
• future-proof PC-connection via USB,
• bus-powered via USB-Bus (no battery needed),
• data transfer monitoring via LED signalization,
• size: 95 mm (L) × 90 mm (W) × 35 mm (H), weight: 90 g,
• excellent price-performance ratio,
• on-screen interactive system operation,
• simultaneous display of 2 channels,
• selection of the port the device has been connected to,
• data saving in data files, offering the possibility of reloading,
• printable examination protocol,
• displayed graphs can be saved as pictures.
V. Blazek
Fig. 1.18 Wavelet Transform of a PPG perfusion signal sequence from the earlobe, additionally
the black line is the instantaneous frequency as the inverse of the HRV signal computed by classical
detection of maxima in the time signal
Post-processing of the PPG recordings are facilitated by the fact that no readjustment of DC-compensation has to be performed by the microcontroller. Thanks to the
wide dynamic range of the implemented electronics used, transmission sensors can
also be attached without further hardware or software modification.
Our current PPG measuring & data acquisition concept offers the following
possibilities:
• intelligent front-end sensor concept (using a miniaturized PPG device, without
any controls, executable and manageable via the associated software),
• long term perfusion studies (also 24/7),
• multi-channel and multi-wavelength design,
• full signal-recording (recording of the complete PPG signal without signal
distortion by the filter in the chain),
• 200 measurement values per channel and second,
• 24-bit digitalization precision,
• future-proof PC-connection via USB,
• bus-powered via USB-Bus (no battery needed),
• data transfer monitoring via LED signalization,
• size: 95 mm (L) × 90 mm (W) × 35 mm (H), weight: 90 g,
• excellent price-performance ratio,
• on-screen interactive system operation,
• simultaneous display of 2 channels,
• selection of the port the device has been connected to,
• data saving in data files, offering the possibility of reloading,
• printable examination protocol,
• displayed graphs can be saved as pictures.