Abstract:
A fluidic cartridge (35; 135) for detecting chemicals, formed by a casing (40; 140), hermetically housing an integrated device (20) having a plurality of detecting regions (22) to bind with target chemicals; part of a supporting element (41; 141), bearing the integrated device; a reaction chamber (65; 165), facing the detecting regions (22); a sample feeding hole (50, 51; 150) and a washing feeding hole (52; 152), self-sealingly closed; fluidic paths (63, 64, 70, 71; 163, 164, 170, 171), which connect the sample feeding and washing feeding holes (50-52; 150, 152) to the reaction chamber (65; 165); and a waste reservoir (80; 180), which may be fluidically connected to the reaction chamber by valve elements (82, 76; 182, 176) that may be controlled from outside. The integrated device is moreover connected to an interface unit (42) carried by the supporting element (41; 141), electrically connected to the integrated device and including at least one signal processing stage and external contact regions (75; 175).
Abstract:
A manufacturing process of a semiconductor piezoresistive accelerometer (35) includes the steps of: providing a wafer (11) of semiconductor material; providing a membrane (23) in the wafer (11) over a cavity (22); rigidly coupling an inertial mass (25) to the membrane (23); and providing, in the wafer (11), piezoresistive transduction elements (24), that are sensitive to strains of the membrane (23) and generate corresponding electrical signals. The step of coupling is carried out by forming the inertial mass (25) on top of a surface of the membrane (23) opposite to the cavity (22). The accelerometer (35) is advantageously used in a device for monitoring the pressure (30) of a tyre of a vehicle. The cavity may be formed as a buried cavity. The mass may be formed by silk-screen printing of a metal paste.
Abstract:
An electronic microbalance (1) made in a semiconductor body (2) accommodating an oscillating circuit (38) adjacent to a diaphragm (18; 121;151). A stack formed by a first electrode (10), a second electrode (15), and a piezoelectric region (11) arranged between the first and the second electrode extends above the diaphragm. Any substance that deposits on the stack causes a change in the mass of the microbalance and thus in the resonance frequency of a resonator formed by the microbalance and the oscillator (19) connectable thereto and can thus be detected electronically. A chemical sensor is obtained by forming a sensitive layer (16) of a material suitable for binding to target chemicals on the stack.