Absolute gravimeter vibration isolation system based on three leaf spring and three suspension spiral springs

Abstract

The invention discloses an absolute gravimeter vibration isolation system based on three leaf springs and three suspension spiral springs and belongs to the absolute gravity measurement technical field. The system includes a feedback circuit; the system is provided with an outer frame upper disc, an outer frame base, outer frame supporting rods, reed fixing blocks, reeds, reed chucks, a middle frame upper disc, middle frame supporting rods, a middle frame base, adjustable screw rods, spiral springs, a reflecting prism base, a high-precision capacitance displacement sensor, a reflecting prism,a magnetic cylinder coil and bottom foot helixes; and the core part of the system includes a two-level vibration isolation system composed of the three leaf springs and the three spiral springs; and by means of the coupling of the two-level system, a second-level elastic structure can be provided, and therefore, the equivalent period of the entire system can be increased to tens of seconds or more, and the entire system can be equivalent to an overlong spring. According to the absolute gravimeter vibration isolation system of the invention, the vibration isolation effect of the entire vibration isolation system for pulse signals to ground (3-6s) can be ideal by means of the feedback circuit. The absolute gravimeter vibration isolation system is simple in structure and is convenient to operate. With the absolute gravimeter vibration isolation system adopted, good technical support can be provided for the search and development of a high-precision absolute gravimeter.

Description

technical field [0001] The invention relates to the technical field of absolute gravity measurement, in particular to an absolute gravimeter vibration isolation system based on three leaf springs suspending coil springs. Background technique [0002] In absolute gravity measurement, ground micro-vibration has become the main noise source of measurement. Vibration isolation technology can greatly reduce the impact of environmental noise on precision measurement, which has great significance and broad application prospects. Vibration isolation system has always been one of the key problems that researchers at home and abroad need to face and solve. The vibration isolation system itself is a low-pass system, and improving the natural period of the system also improves the vibration isolation performance of the system. [0003] At present, the vibration isolation systems used in absolute gravimeters in the world mainly include Super Spring (two-stage spring active vibration iso...

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Problems solved by technology

However, the system considers the air pressure and temperature change compensation structure, which makes the mechanical structure of the system complicated.

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