Evaluation circuit for determining complex impedances z.sub.1, z.sub.1 device for measuring a complex impedances and use of the device

摘要

the present invention relates to an evaluation circuitry for identifying complex impedance and a device for measuring complex impedance with the evaluation circuitry.the erfindungsgemu00e4u00dfe device for measuring complex impedance can vorteilhafterweise to analyse the properties of liquids, and to determine the alterungszustands of lubricants, the moisture measurement in erdbu00f6den, for the measurement of ionenkonzentrationen, determination of water content s in liquids with low dielektrizitu00e4tszahl,in particular, for the determination of wasserkonzentration in alcohols and vice versa, to determine the water content in oil, and vice versa, to determine the water content in brake fluid, to determine the composition of milk, especially for determining their fat content.to determine the time of the curing of concrete and to study the contamination of soil with oil or acids are used. in particular, if the device as a sensor to a surface wave sensor includes, with the erfindungsgemu00e4u00dfen device acids and alkalis in water and their konzentrationsbestimmung identified to be made.$a erfindungsgemu00e4u00dfe evaluation circuitry to determine the complex impedance includes a source for the production of two wechselspannungssignale with a first frequency, a power source, by the first of the two wechselspannungssignalen controlled and is suitable...