The present invention proposes a
noise shielding
system and method for measuring extremely weak
plasma electrical signals of electric thrusters, which consists of an
ion beam, an E×B probe main structure, a
signal collection module, a
coaxial cable shielding layer in the cabin, a
coaxial cable signal line in the cabin, an
aluminum foil protective layer, a vacuum cabin wall, a
coaxial cable cabin joint, an outer coaxial cable shielding layer, an outer coaxial cable
signal line, a picoammeter grounding wire, and a picoammeter. The scheme and signal collection module design of the present invention take into account the
noise interference that may occur in the entire circuit, and shield and suppress the
noise through the above-mentioned means, which greatly improves the signal-to-noise ratio of the E×B probe, and can suppress the
background noise of the E×B
probe signal measurement to the pA level. The signal collection module for receiving the current signal adopts a design based on the standard
BNC connector, which is quick and convenient to process and install. Compared with the stable
welding connection, it improves the robustness, replaceability and
scalability of the entire set of equipment, has a wide applicability, and has a low
system cost.