Product description
UV-3726 Irradiance Detector for UV-C LEDs and low-pressure Hg lamps
The UV-3726 model offers all the properties and features of the UV-37 series detectors. They are specially designed for radiometric measurement tasks in the UV spectral region and have been proven in industrial and scientific use over many years.
The UV-3726 detector incorporates a photodiode that is only sensitive in the short-wave spectral range. In conjunction with additional optical filtering, only radiation in the specified spectral sensitivity range is measured. This combination enables the radiometric measurement of UV-C LEDs and low-pressure mercury lamps. Selectable calibration factors for common UV LED wavelengths and low-pressure Hg lamps increase the measuring accuracy.
To measure the irradiance, the detector’s entrance optic is a diffuser with a cosine field of view, which must be positioned in the desired plane of measurement. The diffuser, optical correction filter and photodiode are pre-aged with UV radiation to significantly reduce the inevitable aging process that results from exposure to UV radiation. The UV-3726 detector shows very little aging effects even in intensive use. Any changes are recorded and corrected as part of the recommended annual recalibration.
The photodiode of the UV-3726 detector offers a strictly linear relationship between the measurement signal and the irradiance in the range from a few pico amps (10-12 A) to several micro amps (10-6 A). When connected to the Gigahertz-Optik X1-1-V02 meter it provides a linear measurement range up to at least 1000 mW / cm² with a resolution of 0.002 µW / cm².
Calibration
Reliable measurements in absolute units require the calibration of the measuring device with traceability to national metrological institute (NMI) standards. Since 1993, the Gigahertz-Optik measuring laboratory has been accredited as a calibration laboratory by the PTB (Physikalisch-Technische Bundesanstalt) and the DAkkS (German Accreditation Body) for the measurement of spectral responsivity and spectral irradiance. Since then, all factory calibrations have been closely based on the calibration standards and quality management of the accredited calibration laboratory. Therefore, the factory calibrations of Gigahertz-Optik offer the highest possible level of traceability and have been accepted worldwide for many years.
In accordance with the requirements of individual industrial sectors, part of the measuring laboratory is accredited by the DAkkS as a DIN EN ISO / IEC 17025 test laboratory.
The UV-3726 detector is calibrated for its spectral responsivity. When performing a measurement, the nominal wavelength of the UV-LED or Hg lamp can be selected on the X1-1-V02 meter for highest precision. The meter offers several calibration options:
- An average calibration factor for measuring any UV LEDs in the spectral range
from 260 nm to 290 nm. - A specific calibration factor for measuring low-pressure Hg lamps (at 254nm).
- Eleven, wavelength dependent, calibration factors given in 5 nm increments from 250 to 300 nm for measuring UV LEDs with known nominal wavelength.
Typical spectral sensitivity of the UV-3726 detector shown together with typical germicidal UV LEDs at 265, 275 und 285 nm.
Typical spectral sensitivity of the UV-3726 detector shown together with low-pressure Hg germicidal lamp at 254 nm.
Typical field of view with good cosine correction
| Calibration | |||
| Calibration | Calibration of irradiance responsivity in A/(W/m²). Eleven calibration factors in 5 nm steps (250-300 nm) plus 254nm and average calibration factor (260-290nm). |
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| Specification | |||
| spectral responsivity | UV 240 nm - 320 nm |
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| typical responsivity | 50 µA / (W / cm2) |
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| Max. signal current | 50 µA | ||
| Input optics | 11 mm Ø diffusor window | ||
| Input optics | Cosine F.O.V. | ||
| Housing | 37 mm Ø, 32 mm height | ||
| Mounting | side M6 thread hole | ||
| Connector | coaxial cable 2 m Long, with BNC (-1), calibration data (-2) or ITT (-4) connector | ||
| temperature range | (5 - 40) °C temperature coefficient: -0.134 %/°C (*determined with 254 nm lamp)
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| min. signal current | depends on optometer |
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