SU970274A1

SU970274A1 - Piezoelectric resonator resonance gap measuring method

Info

Publication number: SU970274A1
Application number: SU813283592A
Authority: SU
Inventors: Владимир Андреевич Дударев; Андрей Валерьевич Мартынов; Борис Викторович Сивков
Original assignee: Предприятие П/Я В-2132
Priority date: 1981-04-29
Filing date: 1981-04-29
Publication date: 1982-10-30

Description

Изобретение относится к радиоизмерительной технике и может быть использовано для определения параметров пьезоэлектрических резонаторов.The invention relates to a radio measurement technique and can be used to determine the parameters of piezoelectric resonators.

Известен способ, реализованный устройством измерения относительно резонансного промежутка резонаторов, заключающийся в том, что испытуемый резонатор возбуждается поочередно на частотах резонанса и антирезонанса с последующим определением резонансного промежутка как разности этих час^тот [’.}Known method implemented measuring device relative to the resonance period of the resonator, comprising the steps that the test resonator is excited alternately in resonance and antiresonance frequencies with subsequent determination of the resonance period as a difference of ^the h [ '.}

Недостаток известного способа низкая точность измерения.The disadvantage of this method is the low accuracy of the measurement.

Из известных способов наиболее близким к предлагаемому по своей технической сущности является способ измерения пьезоэлектрических резонаторов, в котором испытуемый резонатор включают в измерительный четырехполюсник и возбуждают поочередно .на часто2 тах резонанса R. и антирезонансаOf the known methods, the closest to the proposed in its technical essence is a method for measuring piezoelectric resonators, in which the tested resonator is included in the measuring four-terminal network and excited alternately. At the frequencies of R. resonance and antiresonance

F_a [2].F _a [2].

Однако известные способы обладают низкой точностью измерения, так как при очередном возбуждении пьезорезонатора появляется режимная компонента погрешности, обусловленная тем, что практически невозможно обеспечить один и тот же режим возбуждения на частотах F^ и |^из-за резкого различия значений резонансных сопротивлений, и имеется компонента погрешности,, вызванная самопрогревом испытуемого пьезорезонатора за время измерения.However, the known methods have low measurement accuracy, since the next time the piezoelectric resonator is excited, the regime component of the error appears due to the fact that it is practically impossible to provide the same excitation mode at the frequencies F ^ and | ^ due to the sharp difference in the values of the resonance resistances error component, caused by self-heating of the tested piezoresonator during the measurement.

Цель изобретения - повышение точности измерения.The purpose of the invention is to improve the accuracy of measurement.

Поставленная цель достигается тем, что согласно способу измерения резонан сного промежутка пьезоэлектрических резонаторов, основанному на возбуждении резонатора на частотах резонанса и антирезонанса в измерительном четырехполюснике в режиме автоколебанийThis goal is achieved by the fact that according to the method for measuring the resonant gap of piezoelectric resonators, based on the excitation of the resonator at the resonance and antiresonance frequencies in the measuring four-terminal in the self-oscillation mode

970274 4 или автоподстройки частоты, пьезоэлектрический резонатор возбуждают на частоте резонанса и одновременно на измерительный четерхполюсник подают второй сигнал, которым возбуждают пье-5 зоэлектрический резонатор на частоте антирезонанса, причем разность между частотой резонанса и частотой второго сигнала измеряют в тот момент, когда последняя совпадает с частотой анти- ю резонанса,970274 4 or auto-tuning the frequency, the piezoelectric resonator is excited at the resonance frequency and at the same time a second signal is fed to the measuring chetchropole, which excites the Pie-5 zoelectric resonator at the antiresonance frequency, and the difference between the resonance frequency and the frequency of the second signal is measured at the moment when the latter coincides with anti-resonance frequency,

На чертеже показано устройство, реализующее предлагаемый способ.The drawing shows a device that implements the proposed method.

Устройство содержит генератор 1, генератор 2, цепь 3 обратной связи, 15 измерительный четырехполюсник 4, смеситель с фильтром низкой частоты, частотомер 6, индикатор 7 резонанса, фильтр 8 и индикатор 9 антирезонанса.The device comprises a generator 1, a generator 2, a feedback circuit 3, a 15 measuring four-terminal 4, a mixer with a low-pass filter, a frequency counter 6, a resonance indicator 7, a filter 8 and an anti-resonance indicator 9.

Измерение резонансного промежутка 20 предлагаемым способом в данном устройстве производят следующим образом.The measurement of the resonance gap 20 of the proposed method in this device is as follows.

Испытуемый пьезорезонатор включают в измерительный четырехполюсник 4 и возбуждают с помощью цепи 3 обратной 25 сцлзи на частоте резонанса в режиме автоколебаний или автоподстройки частоты. Одновременно на вход измерительного четырехполюсника 4 подают второй сигнал от генератора 2, которым воз- ₃₀буждают испытуемый резонатор на антирезонансной частоте. Настройку резонанса и антирезонанса осуществляют с помощью индикаторов 7 и 9, причем индикатор 9 подключают к измерительному четырехполюснику 4 через фильтр 8, подавляющий сигнал частоты F_rгенератора 1, мешающий настройке на частоту F_a.The test piezoresonator is included in the measuring four-terminal 4 and excited with the help of circuit 3 reverse 25 cslzi at the resonance frequency in the mode of self-oscillations or automatic frequency control. At the same time, a second signal from the generator 2 is supplied to the input of the measuring four-terminal 4, which excites the tested resonator at the antiresonance frequency ₃₀ . The resonance and antiresonance are adjusted using indicators 7 and 9, and the indicator 9 is connected to the measuring four-terminal 4 through a filter 8, which suppresses the frequency signal F _{r of the} generator 1, which interferes with tuning to the frequency F _a .

Разность между частотами резонанса _4Qи антирезонанса измеряют после смеси теля 5 с фильтром нижних частот частотомером 6.The difference between the frequencies of the _4Q resonance and antiresonance is measured after the mixture of the body 5 with the low-pass filter with a frequency meter 6.

Положительная эффективность от измерения резонансного промежутка пьезоэлёктрических резонаторов предлагаемым способом оценивается повышением точности измерений в 3^_4 раза.The positive efficiency from measuring the resonance gap of piezoelectric resonators by the proposed method is evaluated by increasing the accuracy of measurements 3 ^_ 4 times.

Claims

The invention relates to a radio measuring technique and can be used to determine the parameters of a piezoelectric resonator. The known method implemented by the measuring device relative to the resonant gap of the resonators, consists in that the test resonator is excited alternately at the frequencies of resonance and antiresonance, followed by the determination of the resonant gap as the difference of these frequencies 13 The disadvantage of the known method is low measurement accuracy. Of the known methods, the closest to the proposed technical essence is the method of measuring piezoelectric resonators, in which the test resonator is included in a measuring quadrupole and excite alternately at the frequencies of the FL. and antiresonance. C2. However, the known methods have a low measurement accuracy, since at the next excitation of the piezoresonator a mode component of the error appears, due to the fact that it is almost impossible to provide the same excitation mode at frequencies F and 1 due to the sharp difference in the values of resonant resistances, and errors caused by the self-heating of the piezoresonator under test during the measurement. The purpose of the invention is to improve the measurement accuracy. This goal is achieved by the fact that, according to the method of measuring the resonant gap of piezoelectric resonators, based on the excitation of the resonator at the resonance and antiresonance frequencies in the measuring quadrupole in the 3B7Q self-oscillation mode or frequency auto-tuning, the piezoelectric resonator is excited at the same time, and a rat aelectric resonator at the same time, at the same time, at the same time, a rat-emitter resonator is excited at the same time. which excite the pied zoelectric resonator at the antiresonance frequency, and the joy between the resonance frequency and the frequency of the second signal is measured at the moment when the latter coincides with the frequency of antiresonance. The drawing shows a device that implements the proposed method. The device contains a generator 1, a generator 2, a feedback circuit 3, a measuring quadrupole k, a mixer H with a low-frequency filter, a frequency meter 6, a resonance indicator 7, a filter 8 and an indicator 9 of antiresonance. The measurement of the resonance gap by the proposed method in this device is carried out as follows. The piezoresonator under test is included in the measuring quadrupole and excited with the help of circuit 3 of the reverse voltage at the resonance frequency in the mode of self-oscillation or auto-tuning of the frequency. At the same time, the second signal from generator 2 is fed to the input of the measuring quadrupole k, which excites the test resonator at the antiresonant frequency. The resonance and antiresonance settings are carried out using indicators 7 and 9, the indicator 9 being connected to the measuring quadrupole A through a filter 8, suppressing the signal of the frequency F of the generator 1, interfering with the tuning to frequency 1. The difference between the resonance frequencies and the antiresonance is measured after the mixture of 4 bodies 5 with a low-pass filter with a frequency meter 6. The positive efficiency from measuring the resonant gap of the piezoelectric resonators by the proposed method is evaluated by increasing the measurement accuracy 3-k times. The CnocojS claims of measuring the resonant gap of a piezoelectric resonator, based on the excitation of a resonator at resonant and antiresonant frequencies in a measuring quadrupole in self-oscillation or auto-tuning mode, characterized in that, in order to improve the accuracy of measurements, the piezoelectric resonator is excited at resonance frequency and resonant at resonance frequency. the quadrupole serves the second signal, which excites the piezoelectric device at the antiresonance frequency, and spine between the resonance frequency and the frequency of the second signal is measured at the moment when the latter coincides with the antiresonance frequency. Sources of information taken into account during the examination 1. USSR author's certificate ff 618701, cl. G 01 R 29/22, 1978.

2.Ivanchin V.F. Shkinder E.G. Automatic measurement of the parameters of piezoelectric resonators. Electronic Engineering, 1971, vol. 2, s. 59-65 (prototype).