Design of an in-water spectrograph for irradiance measurements in the ocean

de, E.

doi:10.1117/12.55956

Cited by 5 publications

(3 citation statements)

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“…The plausible reason for this is attributed to the tethered cable, which produces negative buoyancy due to the air trapped in the jacket of the cable. The solution to this problem is do away with tethered cable and a have self-recording feature in the radiometer (Desa and Desa 1991;Desa et al 1994). The stability of the radiometer could probably be improved by changing the shape of the nose cone.…”

Section: Discussion and Suggestionsmentioning

confidence: 99%

“…The in-water profiling radiometers using latter modes of deployment suffered from the shading effect of the platforms (Voss et al 1986;Zibordi and Ferrari 1995;Hooker et al 2001;Hooker et al 2003). Most of the profiling radiometers were tethered with a reinforced cable that carries the power and data, which was avoided in a self-recording hyperspectral radiometer (Desa and Desa 1991;Desa et al 1994). As a remedy to the problem of ship shadow, one of the recommended methods for the deployment of the free falling profiling radiometer was the "fish out" method, taking care to keep the radiometer at a safe distance away from the ship before taking measurements (Waters et al 1990).…”

Section: Introductionmentioning

confidence: 99%

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A Simple Method to Minimize Orientation Effects in a Profiling Radiometer

et al. 2012

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Marine optical parameters required for ocean color satellite applications need to be measured with high accuracy and errors within the permissible limits. These stringent requirements demand careful measurements of optical parameters. Though the free fall radiometer is found to be a better option for measuring underwater light parameters as it avoids the effects of ship shadow and is easy to operate, the measurements however demand profiling the radiometer vertical in water with minimum tilt. Here we present the results of our observations on the tilts of the radiometer from the measurements in the Arabian Sea. Since there is hardly any study carried-out on the tilt of the profiling radiometer, the result of this study will help in the better design of such marine instruments. The tilt of the radiometer near the surface of water is attributed to the mode of deployment and environment parameters, while the tilt at depth of water is influenced by the density variations of the water. Here we also demonstrate a method of deploying the instrument that minimize the tilt of the instrument at the surface layer of water.

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Section: Discussion and Suggestionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Simple Method to Minimize Orientation Effects in a Profiling Radiometer

et al. 2012

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“…The spectral measurement of upward and downward irradiance and radiance in the ocean at different depths provides one of the best methods for studying the optical char acteristics of seawater [10]. Compared to the measurement of spectral radiance on land there are numerous factors that affect underwater radiance measurements.…”

Section: Theoretical Foundationmentioning

confidence: 99%

Optical Design and Stray Light Analysis of Underwater Spectral Radiometer

Zhang,

Wang,

Yue

et al. 2024

Applied Sciences

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Underwater spectral detection plays an important role in the study of the underwater environment, ecology, oceanography, and environmental monitoring. A kind of underwater spectral radiometer that can observe the distribution of underwater spectral radiation bidirectionally has been developed. The flat-field concave holographic grating is used as the only optical component, the optical design parameters are optimized, and the system is miniaturized. The mechanism of stray light generation in the spectrometer is studied, and a method of suppressing stray light is proposed and simulated. The level of stray light in the system is suppressed to the order of 10−4, the signal-to-noise ratio of the system is improved, and the ability to detect weak light is enhanced. The wavelength calibration experiment was completed, and the experimental results show that the wavelength resolution of the underwater spectral radiometer is better than 3 nm. Finally, the quantitative relationship between spectral irradiance and digital output is obtained through radiation in the calibration of the system.

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