Quantum Absolute Gravimeter

Abstract

The invention discloses a quantum absolute gravimeter, which includes a control system, a laser system and a probe system connected to each other through electric wires and / or optical fibers; Components and execution components, power supply, control components and execution components are connected to each other. The execution components are arranged on one side of the light output path of the laser system. The execution components include a light blocking component and a device connected to it for driving its rotation to open or close the light path. A stepping motor, the stepping motor includes a rotor and at least a first winding and a second winding are arranged along a certain circumferential direction outside the rotor, the control assembly is connected with the first winding and the second winding respectively, by controlling the The direction and magnitude of the currents in the first winding and the second winding drive the stepper motor to rotate, so that the light-shielding component blocks or avoids light. The gravimeter enables rapid switching on and off of the laser band.

Description

technical field [0001] The invention relates to a gravimetric measuring device, in particular to a quantum absolute gravimeter capable of realizing rapid opening and closing of an optical circuit switch. Background technique [0002] The optical path switch is generally used in the on-off control of the laser beam. By rotating the shutter to the specified position, the beam can be completely turned off, so as to achieve the controllable switch of the beam in the optical path. With the miniaturization of the optical path, the mechanical shutter generally needs to have the characteristics of small size, low noise, fast response, fast and accurate shutdown and so on. [0003] The optical circuit switch is usually mainly composed of three parts: light blocking plate, stepping motor and driving circuit. The function of the light blocking sheet is to block light. By fixing the light blocking sheet on the rotor of the stepping motor, when the stepping motor rotor rotates, the ligh...

AI Technical Summary

Problems solved by technology

It is common that the moment of inertia of the stepper motor rotor of this volume is less than 10gm^2, and the moment of inertia of the light blocking sheet is greater than that of the stepping motor rotor itself. In this way, when the moment of inertia of the light blocking sheet is too large, the traditional subdivision In the foot-driving method, there will be vibration caused by the continued movement of the light barrier after reaching the designated position due to inertia.

For example: for a common 20-step stepper motor that meets the volume requirements (18 degrees for a single step, the torque is about 1mNm), after installing the light barrier, the single step time is about 4ms, and the time for two steps to 36 degrees It is about 6ms, but due to the inertia, it will swing back and forth around this angle, and the final stop time is about 100ms. The maximum angle of the initial overshoot can reach more than 18 degrees. Overshoot will affect the light blocking effect. Generally, the mechanical shutter can respond quickly. The shape of the designed light barrier is slightly larger than the spot size, and once the overshoot exceeds 2-3 degrees, it cannot be turned off, so the traditional subdivision drive cannot be applied to the miniaturized optical path that requires fast optical switches

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