Method of mounting elastic wave generator

A method of mounting a magnetostriction oscillator to an object to which an elastic wave is transmitted, the magnetostriction oscillator comprising an excitation coil wound around a stack of sheets of a metallic magnetostriction material bonded together with an electrically insulating bonding agent, for generating an elastic wave in a direction parallel to the sheets by passing an excitation current through the excitation coil, the method comprising:

• forming two opposing elastic wave radiation end surfaces of a magnetostriction oscillator by stacking the sheets to form two parallel end surfaces intersecting at right angles with an elastic wave radiation direction, the end surfaces of the magnetostriction oscillator being spaced apart from each other by a distance A at room temperature;
• forming a non-magnetic spacer having two opposed parallel faces spaced apart from each other by a distance C at room temperature;
• providing, in an oscillator support, a hole or a recess having two parallel wall surfaces intersecting at right angles with the elastic wave radiation direction and spaced apart from each other by a distance B at room temperature, wherein the distance B is smaller than the distance A plus the distance C;
• cooling the magnetostriction oscillator until the distance between the two end surfaces of the magnetostriction oscillator becomes a distance A1, smaller than the distance A;
• inserting the magnetostriction oscillator, while cooled, and the non-magnetic spacer into the hole or recess of the oscillator support with the non-magnetic spacer interposed between one of the end surfaces of the magnetostriction oscillator and one of the wall surfaces of the oscillator support;
• and
• raising the temperature of the magnetostriction oscillator, to room temperature to bring a first of the end surfaces of the magnetostriction oscillator into direct contact with a first of the wall surfaces of the oscillator support and to bring the faces of the non-magnetic spacer into direct contact with a second of the end surfaces of the magnetostriction oscillator and a second of the wall surfaces of the oscillator support, respectively.

A method of mounting a magnetostriction oscillator to an object to which an elastic wave is transmitted, the magnetostriction oscillator comprising an excitation coil wound around a stack of sheets of a metallic magnetostriction material bonded together with an electrically insulating bonding agent, for generation an elastic wave in a direction parallel to the sheets by passing an excitation current through the excitation coil, the method comprising:

• forming two opposing elastic wave radiation end surfaces of a magnetostriction oscillator by stacking the sheets to form two parallel end surfaces intersecting at right angles with an elastic wave radiation direction, the end surfaces of the magnetostriction oscillator being spaced apart from each other by a distance A at room temperature;
• forming a pair of non-magnetic spacers, each spacer having two opposed parallel faces spaced apart from each other by a distance C at room temperature;
• providing, in an oscillator support, a hole or a recess having two parallel wall surfaces intersecting at right angles with the elastic wave radiation direction an spaced apart from each other by a distance B at room temperature, wherein the distance B is smaller than the distance A plus the distance 2C;
• cooling the magnetostriction oscillator until the distance between the two end surfaces of the magnetostriction oscillator becomes a distance A1, smaller than the distance A;
• inserting the magnetostriction oscillator, while cooled, and the two non-magnetic spacers into the hole or recess of the oscillator support, with each of the non-magnetic spacers at a respective end surface of the magnetostriction oscillator;
• and
• raising the temperature of the magnetostriction oscillator to room temperature to bring a first of the faces of each of the non-magnetic spacers into direct contact with respective wall surfaces of the oscillator support and to bring a second of the faces of each of the non-magnetic spacers into direct contact with respective end surfaces of the magnetostriction oscillator.