Apparatus for detecting infrasound

An apparatus for detecting infrasound, comprising:

• a sound wave detector comprising a first container that defines a first inner space, a diaphragm dividing the first inner space into a first compartment and a second compartment, an input port exposing the first compartment to an external air, and an electrode structure disposed in the second compartment to face the diaphragm and constituting a capacitor with the diaphragm;
• and
• a sound wave filter comprising a second container that defines a second inner space connected to the second compartment, and a microchannel airway assembly joined to the second container, that defines a plurality of microchannel airways with different acoustic resistance values with respect to transmission of a sound wave, and exposing the second inner space to the external air through only one of the plurality of microchannel airways,
• wherein the microchannel airway assembly comprises a plurality of tubular microchannel units respectively defining the plurality of microchannel airways and a connective structure selectively connecting the only one of the plurality of tubular microchannel units to the second inner space so that the second inner space is exposed to the air through only one of the plurality of microchannel airways,
• wherein the connective structure comprises a microchannel airway connective cap joined to the second container that defines a first opening connected to the second inner space;
• and a microchannel airway holder that defines a plurality of second openings into which the tubular microchannel units are inserted, respectively, and joined to the microchannel airway connective cap to be rotatable.