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The V-650 is a double-beam spectrophotometer with a photomultiplier tube (PMT) detector. The high sensitivity of the PMT enables accurate measurements of low (and high) concentration samples.

“It has to resonate.” Sagnac’s counter-rotating beams of light are analogous to beams in a linear cavity. If the turntable rotates clockwise, the beam traveling clockwise has farther to go ...

School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, P. R. China ...