UV dosimetry system with sensor data correction
A UV exposure dosimetry system includes at least one UV sensor that accurately measures the UV irradiance intensity. The system can generate extrapolated UV intensity data based on measured UV intensity data to correct unreliable UV measurement due to inconsistent irradiation of UV light. The UV dosimetry system integrates the extrapolated UV intensity data over time to calculate the real-time UV dosage and the vitamin D production by taking into account factors comprising UV sensor location, body surface area, clothing coverage, and sunscreen usage. Based on the measurement, the system can predict the time remaining to skin burn and the time remaining to reach daily goal of vitamin D production. The UV dosimetry system supports multi-user control through an advanced and user friendly input and output interface.
1. A device comprising:
a UV sensing unit comprising a circuitry for measuring irradiating UV intensity; and
a mobile computing unit, wherein the mobile computing unit is a non-transitory computer readable medium having computer executable instructions stored thereon, said instructions control at least one processor to:
receive UV intensity data measured by the UV sensing unit; and
generate extrapolated UV intensity data repeatedly in running windows of received UV intensity data, each running window has a predefined duration.
2. The device of claim 1 is adapted to calculate exposed UV dose for a user of the device based on the extrapolated UV intensity data.
3. The device of claim 1 is adapted to calculate cutaneous vitamin D generation for a user of the device based on the extrapolated UV intensity data.
4. The device of claim 1 is adapted to calculate daily sun exposure time based on the extrapolated UV intensity data.
5. The device of claim 1 , wherein generating extrapolated UV intensity data in a running window comprising:
counting a number (G) of measured UV intensity values that are greater than or equal to a predefined UV intensity threshold in the running window;
finding a maximum UV intensity value (UVMAX) in the running window;
setting extrapolated UV intensity values to MIN(G, C)/C×UVMAX in the running window if G>0, wherein C is a predefined constant; and
setting extrapolated UV intensity values to measured UV intensity values in the running window if G=0.
6. The device of claim 5 , wherein the UV sensing unit has multiple UV sensors, each UV sensor measures irradiating UV intensity, and UVMAX is the maximum UV intensity value measured by all UV sensors in the running window.
7. The device of claim 1 , wherein the running windows are overlapping.
8. The device of claim 1 , wherein the running windows are non-overlapping.
9. A system comprising:
a wearable unit comprising a circuitry for measuring irradiating UV intensity; and
a mobile computing device having computer executable program stored thereon, said program controls at least one processor to:
receive UV intensity data measured by the wearable unit; and
generate extrapolated UV intensity data repeatedly in running windows of
received UV intensity data, each running window has a predefined duration.
10. The system of claim 9 is adapted to calculate exposed UV dose for a user of the system based on the extrapolated UV intensity data.
11. The system of claim 9 is adapted to calculate cutaneous vitamin D generation for a user of the system based on the extrapolated UV intensity data.
12. The system of claim 9 is adapted to calculate daily sun exposure time based on the extrapolated UV intensity data.
13. The system of claim 9 , wherein generating extrapolated UV intensity data in a running window comprising:
counting a number (G) of measured UV intensity values that are greater than or equal to a predefined UV intensity threshold in the running window;
finding a maximum UV intensity value (UVMAX) in the running window;
setting extrapolated UV intensity values to MIN(G, C)/C×UVMAX in the running window if G>0, wherein C is a predefined constant; and
setting extrapolated UV intensity values to measured UV intensity values in the running window if G=0.
14. The system of claim 13 , wherein the wearable unit has multiple UV sensors, each UV sensor measures irradiating UV intensity, and UVMAX is the maximum UV intensity value measured by all UV sensors in the running window.
15. The system of claim 9 , wherein the running windows are overlapping.
16. The system of claim 9 , wherein the running windows are non-overlapping.
17. A non-transitory computer readable medium having computer executable instructions stored thereon, said instructions control at least one processor to implement a method to correct unreliable UV measurement, the method comprising:
measuring UV intensity irradiating on a device; and
generating extrapolated UV intensity data repeatedly in running windows of measured UV intensity data, each running window has a predefined duration.
18. The non-transitory computer readable medium of claim 17 is adapted to calculate exposed UV dose and cutaneous vitamin D generation for a user of the device based on the extrapolated UV intensity data.
19. The non-transitory computer readable medium of claim 17 , wherein generating extrapolated UV intensity data in a running window comprising:
counting a number (G) of measured UV intensity values that are greater than or equal to a predefined UV intensity threshold in the running window;
finding a maximum UV intensity value (UVMAX) in the running window;
setting extrapolated UV intensity values to MIN(G, C)/C×UVMAX in the running window if G>0, wherein C is a predefined constant; and
setting extrapolated UV intensity values to measured UV intensity values in the running window if G=0.
20. The non-transitory computer readable medium of claim 19 , wherein the device has multiple UV sensors, each UV sensor measures irradiating UV intensity, and UVMAX is the maximum UV intensity value measured by all UV sensors in the running window.