Electronics
UV detecting components
Interesting
-
sglux
- TOCON products - with built in amplifier 0-5 Volt output
-
Electro Optical Components
-
UV Detectors – Silicon Carbide Photodiodes -> Erythema Detectors
- Notably JEC 1/0,1 I-DE
- Need external precision amplifier. App Note Analog Devices, other)
- Outdoor UVI Meters AG-02, AG-03 - Lamppost meter (site fails, 11/2022)
- Similar to Outdoor UV Index Meter - GUVB-S11GS-AG03.3
-
UV Detectors – Silicon Carbide Photodiodes -> Erythema Detectors
- Solarlight Solar sensors
- IFW Optronics
Likely not suitable
- Silicon Labs Si1133 UV Index and Ambient Light Sensor IC with I2C Interface
- Silicon Labs Si1145/46/47 Proximity/UV/Ambient light sensor with
I2C
interface
- Typically, after 285 μs, AUX_DATA will contain a 16-bit value representing 100 times the sunlight UV Index.
- Used in SILICON LABS development kit SLSTK3201A (Farnell CARTE DE DEV EFM32ZG222F32)
- It does not contain a UV photodiode, so it seems to be inferring
the UV index from a combination of visible and IR.
Likely it takes some ratio of visible to IR and infers the solar index assuming a standard sunlight spectrum and some calibration coefficients.- Page 2, Figure 1: visible and IR photodiode sensor. So no UV sensor.
- Page 63, Figure 20: Photodiode Centers shows "Small IR photodiode and visible photodiode" (stacked) and "Large IR photodiode". So no UV sensor.
- eBay UV-sensor
- GUVA-S12D
- 200nm-400nm (UVB only?)
- used on UV Ultraviolet Radiation Ray Detection Sensor Module
Note*
- Arduino UV sensors have typically a resolution of 1 UV factor i.e. 0.1 MED/hr, so cannot be used.
Spectral response
Fig.1: Spectral Responses from different UV-sensors. Normalised response at 300nm (graph made by A. Butterworth).
Fig.2: UVC, UVB, UVA wavelength and relative strength from sunlight (image: Skincareclub)
Fig.3: Comparison of responses of Solarlight 3D XP, Tocon-E and
standard erythema action to reference sunlight spectrum.
The responses of the TOCON-E and 3D XP are very similar, but both underestimate slightly UVA with respect to the standard erythema action response.
See also
- Comparison of different UV sensors for use in an XP radiometer, A. Butterworth, December 16, 2018
Watch projects
Ideas for building an UV-meter can come from other Watch projects:
Other basic kits that may help developing a UV-meter:
-
TI
Sensortag
- Devpack-watch - display only
- Advantage that you can remotely upgrade over Bluetooth and very low power consumption (handy if we want to integrate the same design in the helmet or so and connect to a phone for logging).
Wearable devices
-
Shade
- Wearable UV meter
-
La Roche-Posay
- My Skin Track UV
-
LYS,
LYS: Tracks light and takes care of your circadian rhythm.
- Likely not using UV sensors, still the concept is interesting
This type of sensors are likely not sensitive enough for use in XP
applications. For example, the Shade has an UV sensitivity of 0.01
UVI.
1 MED/hr = 2.32 UVI so 0.01 UVI = 0.0043 MED/h. So the minimum detection
level is like 0.004 on the Model 3D XP.
The XP device being developed is 43 more precise with a sensitivity of
0.0001 MED/h.
UV meters
25 November 2022