Abstract: A spectrometer system includes a processing center, an underwater remote sensor and a communication link coupled therebetween. The sensor is deployed to at least partially penetrate a sediment layer disposed beneath a body of water. The sensor includes a window defining a sediment window plane through which a profile of the sediment layer is observable and a camera, an image plane of which is a conjugate of the window, the camera imaging light from objects in the sediment window plane to generate imagewise data, the imagewise data being transmitted over the communications link to the processing center. The sensor also includes at least one removable cell disposed in the sediment window plane, each removable cell being comprised of a transparent solid material having a void therein, the void in each removable cell for holding a standard material corresponding to the respective removable cell. The sensor further includes a camera filter device having at least one camera filter.

Abstract: An apparatus and method for the in-situ measurement and prediction of the onset of hypoxic conditions in aquatic media is disclosed. The apparatus includes a magnet and sensor for concentrating and measuring biogenic magnetic fields produced by ambient populations of microaerophilic magnetotactic bacteria in aquatic sedimentary environments and means for correlating the measured data with oxygen content in the locations monitored.