... | @@ -19,6 +19,9 @@ the rightmost digit to show in mMED/hr. |
... | @@ -19,6 +19,9 @@ the rightmost digit to show in mMED/hr. |
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printing](http://www.serpac.com/printing.aspx)
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printing](http://www.serpac.com/printing.aspx)
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- [Arrow](https://www.arrow.com/en/products/m6bk/serpac-electronic-enclosures)
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- [Arrow](https://www.arrow.com/en/products/m6bk/serpac-electronic-enclosures)
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(black)
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(black)
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- [Mouser](https://www.mouser.ch/Search/Refine.aspx?Keyword=serpac+m6)
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(all)
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([black](https://www.mouser.ch/ProductDetail/SERPAC/M-6-B?qs=%2fha2pyFaduhxVtpfGjyF0ov2qd89EDKxcsrqNOoDIOYUQeg5GG3igQ%3d%3d))
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Design
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Design
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... | @@ -58,18 +61,21 @@ Design |
... | @@ -58,18 +61,21 @@ Design |
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##### Calculation of required sensitivity and sensor
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##### Calculation of required sensitivity and sensor
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- 1 MED/hr = 5.8 µW/cm² (from [Units](/uv-meters#units))
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- 1 MED/hr = 5.8 µW/cm² (from [Units](/uv-meters#units)).
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- Full display 199 mMED/hr = 0.199 MED/hr = 1,1542 µW/cm² = 1.999 V
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- Multiply by correction factor of 0.24 for a wideband TOCON ABC (that
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- 5V TOCON should have max. irradiance at 5/1.999 \* 1.1542 = 2.89
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is more sensitive for UVA) to correct so that under natural sunlight
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µW/cm²
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gives same reading in med/hr as a perfect erythema meter.
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- See [*Comparison of different UV sensors for use in an XP
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radiometer*](https://www.ohwr.org/project/uv-mask/wikis/Documents/Comparison-of-dierent-UV-sensors), A.
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Butterworth, December 16, 2018 (paragraph above Table 1).
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- Full display 199 mMED/hr = 0.199 MED/hr = (1,1542\*0.24) µW/cm² =
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1.999 V
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- 5V TOCON should have max. irradiance at (5/1.999) \* 1.1542\*024
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= 0.693 µW/cm²
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- [TOCON\_ABC3](https://sglux.de/en/product/tocon_abc3-en/)
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- [TOCON\_ABC3](https://sglux.de/en/product/tocon_abc3-en/)
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max. irradiance (saturation limit) at 290 nm (peak
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max. irradiance (saturation limit) at 290 nm (peak
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wavelength) is approx. 1.8 µW/cm2
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wavelength) is approx. 1.8 µW/cm2
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Not sensitive enough.
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Need attenuation of around a factor of 3, handling tolerance
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- [TOCON\_ABC4](https://sglux.de/en/product/tocon_abc4-en/)
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max. irradiance (saturation limit) at 290 nm (peak
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wavelength) is approx. 18 µW/cm2
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Need attenuation of around a factor of 6, handling tolerance
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of ±20%.
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of ±20%.
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Likely not needed: digital calibration could be made with a [TOCON
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Likely not needed: digital calibration could be made with a [TOCON
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... | @@ -131,5 +137,5 @@ Other |
... | @@ -131,5 +137,5 @@ Other |
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-----
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-----
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Erik van der Bij - 7 January 2019
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Erik van der Bij - 10 January 2019
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