An apparatus for measuring a property of an object with acoustically induced electromagnetic waves, characterized in that it comprises: an acoustic generator for emitting an acoustic wave pulse towards a measurable object; an anechoic chamber; a retainer table for holding said object disposed in said anechoic chamber; an antenna or coil for receiving electromagnetic waves generated from a part of said measurable object which is irradiated with said acoustic wave pulse emitted by said acoustic generator; and a control, measure, and process unit (29, 30, 50, 52, 60, 65, 75, 76) for driving and controlling said acoustic generator and for measuring and processing said electromagnetic waves received by said antenna or coil so as to measure an electric property from one or more characteristics selected from the group which consists of intensity, phase, and frequency characteristics of said electromagnetic waves, the electric property of said measurable object including a change or changes in one or more of property values selected from the group which consists of electric field, dielectric constant, and spatial gradient of electric field or spatial gradient of dielectric constant of said measurable object; and concentration, mass, size, shape, and number of charges of charged particles which said measurable obj ect possesses; and interaction of said charged particles with a medium surrounding said charged particles; characterised in that a time period for said acoustic wave pulse to travel over a distance (d) between said acoustic generator and said object is longer than a duration of electromagnetic trailing noises produced by said acoustic generator. an acoustic generator for emitting an acoustic wave pulse towards a measurable object; an anechoic chamber; a retainer table for holding said object disposed in said anechoic chamber; an antenna or coil for receiving electromagnetic waves generated from a part of said measurable object which is irradiated with said acoustic wave pulse emitted by said acoustic generator; and a control, measure, and process unit (29, 30, 50, 52, 60, 65, 75, 76) for driving and controlling said acoustic generator and for measuring and processing said electromagnetic waves received by said antenna or coil so as to measure an electric property from one or more characteristics selected from the group which consists of intensity, phase, and frequency characteristics of said electromagnetic waves, the electric property of said measurable object including a change or changes in one or more of property values selected from the group which consists of electric field, dielectric constant, and spatial gradient of electric field or spatial gradient of dielectric constant of said measurable object; and concentration, mass, size, shape, and number of charges of charged particles which said measurable obj ect possesses; and interaction of said charged particles with a medium surrounding said charged particles; characterised in that a time period for said acoustic wave pulse to travel over a distance (d) between said acoustic generator and said object is longer than a duration of electromagnetic trailing noises produced by said acoustic generator.