OBS-3A

Frequently Asked Questions FAQs

Frequently Asked Questions: OBS-3A


  1. How do OBS and other optical sensors measure turbidity and suspended solids?

    This application note provides general information about sediment sensors, light sources and detectors, optical designs, applications, and turbidity standards.

  2. How is light transmitted through water samples?

    This application note provides an introduction to light absorption, scattering, and attenuation, as well as other optical properties that affect OBS sensors.

  3. What light sources and detectors are used in OBS sensors?

    This application note provides a description of infrared-emitting diodes, laser diodes, photodiodes, daylight filters, and operating spectra.

  4. How does sediment concentration affect an OBS sensor?

    This application note shows sample calibrations for sand, silt, and clay.

  5. How does sediment size affect an OBS sensor?

    The application note includes OBS response to sand, mud, and flocculants and results of tests by U.S. Navy Civil Engineering Laboratory.

  6. How big are the effects of sediment color on OBS measurements?

    This application note includes information on sediment color and NIR reflectivity.

  7. Does water color affect OBS measurements?

    The application note includes results of tests on dissolved organic and inorganic NIR-absorbing substances in the environment.

  8. Do bubbles affect my OBS data?

    This application note provides a discussion of relative scattering intensities of bubbles and sediment.

  9. Do I need to be concerned about fouling of OBS sensors?

    This application note contains information in biological and chemical fouling.

  10. Does it matter how I prepare sediment calibration standards?

    Read this application note to learn more about the effect of drying and grinding sediment for calibration.

  11. What turbidity standards should I use for calibrating OBS sensors?

    This application note includes a discussion of formazin and SVDB-microsphere turbidity standards.

  12. Can I directly convert NTUs to SSC?

    Read this application note to learn about SSC turbidity relationships.




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