Non-contact optical monitor
This invention relates to the measurement of the characteristics of a liquid sample by an optical non-contact method. A device for monitoring one or more characteristics of a liquid sample, comprising at least one source of collimated radiation, and at least one detector capable of detecting radiation returning from the sample, wherein the optical axis of the radiation source or sources and the optical axis of the detector or detectors are non-parallel, characterized in that the device further comprises means to correct for changes in the intensity of radiation received by the or each detector caused by variations in the range of the device from the sample surface, and variations in the incident angle and scatter angle of the collimated radiation, whereby the or each characteristic of the liquid can still be monitored even when there is a change in sample level.
EP 1,241,464 issued 2007-08-29 [MORE INFO
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