System and method for measuring response time of cold air thruster based on variable dielectric capacitance bridge

Abstract

The invention provides a system and a method for measuring response time of a cold air thruster based on a variable medium capacitance bridge. The system comprises a capacitance bridge circuit component and an operational amplifier circuit component. The capacitance bridge circuit component is connected with the operational amplifier circuit component; the capacitance bridge circuit component comprises a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4 and the cold air thruster; One end of the capacitor C1 is connected with one end of the capacitor C2; the other end of the capacitor C1 is connected with one end of the capacitor C3; the other end of the capacitor C2 is connected with one end of the capacitor C4; the other end of the capacitor C4 is connected with the other end of the capacitor C3; and the capacitor C4 is connected with the cold air thruster. Thrust signals are converted into voltage signals by adopting a variable medium capacitance bridge method, the signals are amplified by adopting an operational amplifier circuit, and finally mus-level signal acquisition can be realized through an oscilloscope so that the requirement of thrust response time is met.

Description

technical field [0001] The invention relates to the technical field of measuring the response time of a cold air thruster, in particular to a system and a method for measuring the response time of a cold air thruster based on a variable medium capacitance bridge. Background technique [0002] With the development of micro-propulsion technology, the supporting performance measurement technology has also been studied. Thrust response time is one of the important performance parameters of thrusters. For a cold gas propulsion system, the thrust response time includes the time for the power supply of the brake components, response, and the filling and ejection of the working fluid gas from the thruster. The speed of time. The thrust response time of the cold gas propulsion system is usually in the millisecond level, and its measurement is difficult. [0003] At present, in the field of micro-thrust measurement, the direct measurement method represented by the traditional torsio...

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Problems solved by technology

[0004] Patent document CN107091705A discloses a micro-thrust measurement method, and also provides a single-pendulum micro-thrust measurement device and a three-wire torsion pendulum micro-thrust measurement device. Under the condition that the direction of gravity and the direction of micro-thrust are vertical, through the principle of mechanical balance, By converting the physical

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