Absorbance, Transmittance and Reflectance
A generic absorbance/transmittance or reflectance measurement system consists of (see the Fig.):
A dual-beam configuration is recommended wherever possible for high-quality reproducible quantitative analysis. The following are some guidelines for absorbance, transmittance, and reflectance measurements:
1. Most chemical and filter applications require smaller monochromators, such as the Acton SpectraPro-150 or Acton SpectraPro-300i. Some applications with samples containing narrow features may require larger monochromators, such as the Acton SpectraPro-500i with 500 mm focal length.
2. Consider the following when choosing a detector:
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Total wavelength region required for the sample measurements
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Expected level of sample absorption
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Light source intensity over the entire wavelength region for the sample measurements
PMT's are normally required for UV measurements, while silicon detectors typically work well over the 400-1100nm range. InGaAs and other appropriate detectors are recommended for measurements above 800nm.
Choose from the following for more detailed application descriptions:
Recommended Products:
Acton Series Monochromators & Spectrographs
- Positrak™ grating stabilization offers simple calibration
- Optimized coatings for higher throughput
- Interchangeable grating turrets with a wide selection of gratings
PIXIS CCD Cameras
- Lifetime vacuum guarantee for worry-free operation
- Deep cooling without the need for liquid circulators
- Up to 1000 spectra/sec data acquisition
PyLoN CCD Cameras
- Cool, quiet and fast!
- Contollerless, LN cooled, highest sensitivity
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Supported by LightField software
PI-MAX ICCD Cameras
- 5MHz digitization provides up to 15 frames per second
- 500ps gating for ultra fast time resolution
- Exclusive UNIGEN photocathode for highest sensitivity from deep UV to NIR
OMA V InGaAs Array Cameras
- Excellent NIR sensitivity for demanding spectroscopy applications
- Electronic shutter allows intergration times down to 20 µsec
- 1MHz digitization provides up to 1800 spectra/sec
