Microcirculation detection system
A microcirculation detection system including a heating device, a photosensitive array and a processing unit is provided. The heating device is used to heat a skin area. The photosensitive array is used to detect outgoing light from the skin area, and output a plurality of brightness variation signals respectively at different time points within a heating period. The processing unit is used to calculate a change of an array energy distribution varied within the heating period according to the plurality of brightness variation signals to accordingly identify a microcirculation state.
1. A microcirculation detection system, comprising:
a light source configured to irradiate light to illuminate a skin area of a user;
a heating device configured to heat the skin area within a heating period;
a photosensitive array configured to detect outgoing light from the skin area and output a plurality of PPG signals; and
a processing unit configured to
convert the plurality of PPG signals to an array energy distribution,
identify an arc-like pattern in the array energy distribution,
calculate a frequency variation of an oscillation of the arc-like pattern within the heating period, and
identify a peak value of the frequency variation respectively in two time intervals within the heating period in reflecting microcirculation of the user.
2. The microcirculation detection system as claimed in claim 1 , wherein a wavelength of the light is between 500 nm and 550 nm.
3. The microcirculation detection system as claimed in claim 1 , further comprising a display configured to show at least one of the arc-like pattern at different time points, the frequency variation, a heating temperature and a skin surface temperature.
4. The microcirculation detection system as claimed in claim 1 , further comprising a timer configured to count the heating period.
5. The microcirculation detection system as claimed in claim 1 , wherein the heating period is 15 minutes.
6. The microcirculation detection system as claimed in claim 1 , wherein the heating device comprises:
a heating chamber configured to accommodate the skin area; and
an infrared heat lamp disposed inside the heating chamber and configured to heat the heating chamber.
7. The microcirculation detection system as claimed in claim 1 , wherein the photosensitive array comprises a plurality of pixel areas arranged in a matrix and respectively configured to output a brightness variation signal as one of the plurality of PPG signals, wherein each of the plurality of pixel areas includes at least one sensing pixel.
8. The microcirculation detection system as claimed in claim 7 , wherein the array energy distribution is an energy value distribution, corresponding to a two dimensional space of the plurality of pixel areas, of spectrum energies at a predetermined frequency of the plurality of PPG signals.
9. The microcirculation detection system as claimed in claim 8 , wherein the oscillation of the arc-like pattern is an energy amplitude oscillation at a position within the arc-like pattern of the energy array distribution corresponding to at least one of the plurality of pixel areas.