Lasers for NIST pH Sensor (IMAGE)
Caption
An empty petri dish with two optical fibers, illustrating one version of the researchers' experiment. The left-hand fiber (usually shining infrared light, but depicted here as visible red light) is a temperature sensor. The top fiber shines green, red or blue light into the petri dish to adjust the signal that the temperature sensor measures.
Credit
J.L. Lee/NIST
Usage Restrictions
None
License
Licensed content