[en] A new cryogenic detector is presented which consists of a bolometer crystal covered with a superconducting film exposed to a microwave flux. An incident particle will create nonthermal phonons which then produce excess quasiparticles in the film. These quasiparticles lead to microwave absorption and a subsequent heating of the bolometer. In this way the energy deposited by a particle in the crystal could be amplified linearly. Gains up to 10⁴ may be obtained, making it possible to build a large volume detector with an excellent energy resolution. (author) 5 refs.; 1 fig