| 摘要 |
PROBLEM TO BE SOLVED: To provide a density measurement device capable of accurately measuring a density of a liquid object to be measured. SOLUTION: The density measurement device 40 includes a first surface acoustic wave device 10 having an electrically-shorted short circuit propagation channel 16 between an input electrode 12 and an output electrode 14, and a second surface acoustic wave device 20 having an uneven structure 38 formed in parallel with a propagation direction of a surface acoustic wave output from the input electrode 22 between the input electrode 22 and the output electrode 24, and having a lattice shaped propagation channel 32 which is electrically shorted. The first surface acoustic wave device 10 and the second surface acoustic wave device 20 are arranged in parallel, input an equal signal to the input electrodes 12, 22 with the object to be measured 46 loaded on the short-circuit propagation channel 16 and the lattice shaped propagation channel 32, and the density of the object to be measured 46 is obtained from a phase difference between respective output signals output from the output electrodes 14, 24. COPYRIGHT: (C)2009,JPO&INPIT
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