title: Short- and long-term stability of resonant quartz temperature sensors.
abstract: A new miniaturized design of the thermosensitive quartz resonator (TSQR) using an NLC cut (yxl/ -31 degrees 30') with a fundamental frequency of 29.3 MHz was created in the Acoustoelectronics Laboratory of ISSPBAS for use in a wide temperature range (4.2 K to 450 K) as highly sensitive quartz temperature sensors (QTS). This paper presents the results of the investigations of the short- and long-term frequency stability of QTS. The short-term frequency stability of QTS was measured for averaging times up to 150 s at three constant temperatures: liquid helium (4.2 K), liquid nitrogen (77 K), and melting ice (0 degrees C). The short-term frequency stability is 6.8 * 10(-9) at 0 degrees C for t = 15 s, which permits a temperature sensitivity of 2 * 10(-4) K. The long-term stability (aging) was investigated at room temperature and at 80 degrees C for 500 days. The aging characteristics at 25 degrees C and 80 degrees C are compared. It was observed that the frequency change does not exceed 5 * 10(-7) after the 25th day of accelerated aging at 80 degrees C. This guarantees a reliable operation of the sensor, without additional calibration, for several years.
authors.affiliation: Acoustoelectronics Laboratory, Georgi Nadjakov Institute of Solid State Physics, Bulgarian Academy of Sciences, Sofia, Bulgaria. lspassov@issp.bas.bg
authors.forename: L
authors.initials: L
authors.lastname: Spassov
authors.forename: V
authors.initials: V
authors.lastname: Gadjanova
authors.forename: R
authors.initials: R
authors.lastname: Velcheva
authors.forename: B
authors.initials: B
authors.lastname: Dulmet
mesh_terms: D003198:Computer Simulation; D017076:Computer-Aided Design; D003460:Crystallization / Q000379:methods; D017097:Electric Impedance; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008956:Models, Chemical; D009991:Oscillometry / Q000295:instrumentation*; D011791:Quartz / Q000737:chemistry* / Q000528:radiation effects*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013817:Thermography / Q000295:instrumentation* / Q000379:methods; D014159:Transducers
chemical_list: D011791:Quartz