Methods, systems, and apparatuses for accurate measurement of health relevant uv exposure from sunlight

The computer executable method of 1, wherein the erythemaly-weighted UV exposure is UV Index, and is a product of a calibration UV index of a known calibration source and a ratio of the output of the sensor when exposed to the unknown electromagnetic source to an output of the sensor when exposed to the calibration source.

The computer executable method of 1, wherein the receiving step comprises receiving as input information that is indicative of an irradiance measured from a sensor that includes a narrow-band filter disposed above a semiconductor.

The computer executable method of 1, further comprising causing to be displayed on a display (e.g., on a display of a smartphone) the estimated erythemaly-weighted UV exposure (e.g., UV Index).

The computer executable method of 1, further comprising causing the estimated erythemaly-weighted UV exposure (e.g., UV Index) to be input to a method (e.g., computer executable method) that determines how much time a person may safely spend outdoors.

A method of using a sensor adapted for use in estimating erythemaly-weighted UV exposure, comprising:

• measuring irradiance from a sensor that is sensitive to incident light and that has a spectral sensitivity from 305 nm-315 nm;
• and
• estimating erythemaly-weighted UV exposure using the measured irradiance.

A system adapted for use in estimating erythemaly-weighted UV exposure:

• a sensor that is more sensitive to light with a wavelength from 305 nm to 315 nm than to light with a wavelength outside of 305 nm to 315 nm;
• and
• a non-transitory memory having stored therein a computer executable method, the computer executable method adapted to receive as input information that is indicative of an irradiance measured from the sensor, and to estimate erythemaly-weighted UV exposure using the information.