| Frequently
Asked Questions
How
do OBS and other optical sensors measure turbidity and suspended
solids?
Click for general information about
sediment sensors, light sources and detectors, optical designs,
applications, and turbidity standards
How
is light transmitted through water samples?
Click for introduction to light absorption, scattering, and attenuation,
as well as other optical properties that affect OBS sensors.
What
light sources and detectors are used in OBS sensors?
Click for description of infrared-emitting
diodes, laser diodes, photodiodes, daylight filters, and operating
spectra.
How
does sediment concentration affect an OBS sensor?
Click to view sample calibrations for
sand, silt, and clay.
How
does sediment size affect an OBS sensor?
Click for OBS response to sand, mud, and
flocculants and results of tests by U.S. Navy Civil Engineering
Laboratory.
How
big are the effects of sediment color on OBS measurements?
Click here to read about sediment color
and NIR reflectivity.
Does
water color affect OBS measurements?
Click for results of tests on dissolved
organic and inorganic NIR-absorbing substances in the environment.
Do
bubbles affect my OBS data?
Click for a discussion of relative scattering
intensities of bubbles and sediment.
Do
I need to be concerned about fouling of OBS sensors?
Click for information in biological and chemical
fouling.
Does
it matter how I prepare sediment calibration standards?
Click to learn more about the effect of
drying and grinding sediment for calibration.
How
does the high-concentration sediment monitor work?
Click here to find out about the OBS-5 technology
and our multidetector, laser-based system.
Can
D&A build me an OEM sensor?
Click for links to see OEM designs and CTDs,
current meters, and data loggers that work with OBS instrumentation.
What
turbidity standards should I use for calibrating OBS sensors?
Click for a discussion of formazin
and SVDB-microsphere turbidity standards.
Can I directly
convert NTU's to SSC?
Click for SSC turbidity relationships.
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