Abstract: This invention unveils an optical microphone utilizing diamond cantilevers and its associated acoustic sensing system. The core component is a diamond cantilever, featuring a diamond diaphragm with a centrally located U-shaped groove. The manufacturing process involves several key steps: initially preparing the diamond diaphragm using silicon in a chemical vapor deposition setup, where methane and hydrogen are reacted under specific temperature and pressure conditions to form a diamond polycrystalline film on the silicon. This film is then separated from the substrate to create the diaphragm. Subsequently, a U-shaped groove is crafted on the diaphragm by applying a dry etching template and etching, resulting in the formation of the diamond cantilever, with a thickness ranging from 10 to 100 ?m. This method establishes a novel approach to creating sensitive and durable optical microphones.

Abstract: The present disclosure relates to a breast pump comprising a suction mechanism and a main body. The suction mechanism comprises an elastic bowl and a suction assembly, the elastic bowl having an accommodation cavity and being at least partially accommodated in the suction assembly. The main body comprises a boss sealingly fitting with the accommodation cavity of the elastic bowl, the boss being provided with a suction hole that is in communication with the accommodation cavity to create a connected passageway. When the main body extracts air through the suction hole and the accommodation cavity decreases so that the elastic bowl contracts, there is no gap between the elastic bowl and the boss, and negative pressure is generated in the suction assembly.

Abstract: A sensor module for detecting particulate matter of an aerosol, which may include a source of electromagnetic radiation and a collector for electromagnetic radiation. The collector may include a cavity and a first opening for the aerosol. The cavity may be reflective for the electromagnetic radiation. The first opening may allow exchange of the aerosol in and out of the cavity. The source of electromagnetic radiation may be arranged to project the electromagnetic radiation onto the aerosol which may be scattered as scattered electromagnetic radiation. The sensor module may include a detector of electromagnetic radiation arranged to detect the scattered electromagnetic radiation that is reflected by the collector. The source and the detector may be arranged on a same side of the collector. The source and the detector may be arranged at a same aperture of the collector.