Search

In order to shorten the design cycle of FOPS and improve the pass rate of FOPS laboratory destructive tests, nonlinear finite element methods of elastic-plastic large displacement were presented to simulate the dynamic displacement, velocity and acceleration of drop hammer during impact process, and the dynamic changing law of these parameters during the whole collision were analyzed. At the same time, the stress and deformation of FOPS happened in the collision process were obtained. Associated with changing law of drop hammer parameters, stress and deformation in FOPS, several laboratory destructive impact tests were conducted, and FOPS deformation patterns and failure modes were acquired. The simulation methods for FOPS were proved to be reasonable and can be the guidance of FOPS design and test.

Three-dimensional atomic magnetometry scheme is proposed and experimented. The scheme uses only one laser beam and can measure three components of the magnetic field independently. Spin-exchange-relaxation-free regime is verified by magnetic resonance measurement. The open loop scale factors of −2.722 mV/nT, −1.452 mV/nT and 0.076 mV/nT for the three axes are characterized. The model considering the frequency response and linewidth variation can fit the measurement data well. As only one laser beam is required, the magnetometry is easy to be realized on chip scale and is particularly attractive for applications requiring low power, low cost and high precision at the same time.