Abstract: The present disclosure embodies an improved optical instrument that includes an embodied fitting to the standardized probe with the optical structure to facilitate refractometer optics to the probe tip with a turbidity and/or color meter to form an embodied optical multimeter.

Abstract: The present disclosure embodies a refractometer that includes an embodied fitting to the standardized probe with the optical structure to facilitate refractometer optics to the probe tip.

Abstract: The present invention relates to a digital camera system comprising an image sensor for capturing digital images, an optical unit for forming an image onto the image sensor, the optical unit having a focus distance that can be varied between a minimum focus distance and a maximum focus distance, a control module for controlling the image sensor and the optical unit, an image processing module for processing captured images, and an image storage for storing captured images. The control module is configured to, upon receiving an order to capture an image, order the image sensor to capture a sequence of images while varying the focus distance between a first and a second focus distance and to store the sequence of captured images in the image storage, and the image processing module is configured to evaluate said sequence of images with regard to a defined criterion, to select at least one images from the sequence of images based on the result of the evaluation.

Abstract: An optical instrument includes a controller and a field head arranged for measuring the refractive index of a medium, or a derivable quantity therefrom. The field head includes a measurement prism having a medium-boundary surface, a first wave guide for providing broad-band light from a broad band light source, a dispersive element for dispersing the broad-band light into at least one component light beam of plural component light beams, so that each incident component light beam has a differently directed propagation path and at least one different wave length, and a condenser for collecting at least one component light beam reflected at the medium-boundary surface into a second wave guide. The dispersive element is arranged to direct at least one component light beam into a critical angle of total reflection from the boundary surface, and at least other light beam component into an angle leading into the condenser arranged to collect at least one other component light beam to be passed to a spectrometer.

Abstract: An optical instrument includes a controller and a field head arranged for measuring the refractive index of a medium, or a derivable quantity therefrom. The field head includes a measurement prism having a medium-boundary surface, a first wave guide for providing broad-band light from a broad band light source, a dispersive element for dispersing the broad-band light into at least one component light beam of plural component light beams, so that each incident component light beam has a differently directed propagation path and at least one different wave length, and a condenser for collecting at least one component light beam reflected at the medium-boundary surface into a second wave guide. The dispersive element is arranged to direct at least one component light beam into a critical angle of total reflection from the boundary surface, and at least other light beam component into an angle leading into the condenser arranged to collect at least one other component light beam to be passed to a spectrometer.