Patent ID: 9228929
Filing Date: 2016-01-05
CPC Classification: G01N

Claim Text:
1. A method of on-line rapid fluid density measurement using a piezoresistive micro-cantilever, comprising the following steps: (1) submerge a piezoresistive micro-cantilever into a standard fluid of known density p (2) provide another sinusoidal alternating voltage of frequency f and amplitude U (3) change the density of the standard fluid into p (4) provide another sinusoidal alternating voltage of frequency f and amplitude U (5) in accordance with the above measuring results and a density equation p=ak+b, calculate parameters a and b of the density equation, wherein, k is a ratio of output voltage difference of the Wheatstone bridge to voltage difference of the excitation coil ( (6) submerge the piezoresistive micro-cantilever into a fluid to be detected, then provide a sinusoidal alternating voltage of frequency f and amplitude U