• Early warning of coral reef degradation
  • Low-cost, local initiative design
  • Year-round water temperature and visibility
Results From Around the World

What the Rainbow Sensor provides for Guests

  • Visibility

The dive location will be able to display year-round graphs of visibility at the location of the rainbow Sensor

The Rainbow Sensor measures the attenuation of blue light between 12 meters and 20 meters. The technical term for this value is Kblue but the non-technical term is water clarity.

Most divers talk about visibility. Visibility is generally considered a subjective term but, recently a scientific paper has defined visibility in scientific terms and provided a scientific method to measure it.

Water clarity is probably the most important component to visibility although sunlight, called PAR in scientific circles, also plays a part.

The Rainbow Sensor Program will visit locations that have rainbow sensors installed and attach visibility measuring instruments to the mooring at 16meters. Visibility will be calculated according to the standard scientific formula.

The Rainbow Sensor Program will relate visibility data at the location with water clarity data and convert the water clarity reading from the Rainbow Sensor to visibility readings that are probably more accurate than human perceptions.

  • Water Temperature

The dive location will be able to display year-round graphs of water temperature at 12 and 20 meter depths.

Trying to decide which wetsuit to bring is a constant problem for divers, made more critical by shrinking travel baggage allowances. The year-round temperature graphs will allow guests to check the results against their time of arrival and make intelligent decisions about what thermal protection to bring.

In addition, water temperature is an important indicator of coral bleaching. How warm and for how long the ocean is the standard indicator. Guests want to know that the reefs are still healthy. Unfortunately, surface temperature readings often give an unnaturally high temperature reading, indicating bleaching when it is not actually happening at typical dive depths.

  • Organic Index

The dive location will be able to display year-round graphs of water quality.

Guests, often mistakenly, perceive on their return visit that the reef has degraded. However, year-over-year comparison ( comparing the same timeframe in successive years) and a generally low Organic Index will dispel these perceptions

The Organic Index (OI) is a measurement of organic components in the water. They are typically dissolved organic material (CDOM) and chlorophyll. Dissolved organic material is usually the result of human pollution and is a direct measurement of water quality. Chlorophyll is usually the result of food for photosynthesis and is an indirect measurement of water quality

How The Rainbow Sensor Works
Benefits for dive guests
How To fund a Rainbow Sensor
Rainbow Sensor Poster
Rainbow Sensor Blog
Rainbow Sensor Assembly
Constructing a rainbow Sensor Mooring
Rainbow Sensor Array Configurations
Site startup Instructions
Correlation Experiment