Abstract: A device to measure the amount of light able to transmit through a liquid. The device uses a light detector and multiple light emitting diodes (LED's) along with an optical unit such that the light detector, LED's, and an optical unit define a path of light emitted by each individual LED or subgroup of LED's and detected by the detector. The device uses a structure designed to surround the LED's and light detector such that the structure allows the device to be immersed in the liquid and such that the structure is shaped to allow a volume of liquid to be between the LED's and detector, intersecting the light path.

Abstract: A device to measure the amount of light able to transmit through a liquid. The device uses a light detector and light source mounted to a support mechanism such that the detector and light source define a path of light emitted by the light source and detected by the detector. The device uses a structure designed to surround a liquid to be tested such that the structure allows light to transmit through the structure and the liquid. An actuator engenders relative motion between the support mechanism and the structure such that at certain times the light propagating between the light source and the detector passes substantially through the structure and the liquid to be tested such that the amount of light able to transmit through the liquid is detected by the detector, and at other times the light propagates directly from the light source to the detector without passing through the structure or the liquid such that the amount of light emitted from the light source is directly detected by the detector.