Experimental Investigation of the Electrical Parameter Changes of Tuning Fork Crystal Oscillators Exposed to Air

초록

We performed frequency response measurements of commercially available tuning fork crystal oscillators and analyzed their measured electrical equivalent circuit parameters of R, L, C-S, and C-P in vacuum and in air. We observed that R and L components increased as the tuning forks were exposed to air while the capacitance components C-S and C-P decreased. Of the changes of the electrical parameters for all the tested tuning forks, the resistance R showed the most significant change. These results seem to indicate that an amplitude modulation detection scheme is advantageous over a frequency modulation detection scheme in sensor applications in gaseous environment. (C) 2010 The Japan Society of Applied Physics