scholarly journals When a Fly Ball Is Out of Reach: Catchability Judgments Are Not Based on Optical Acceleration Cancelation

2017 ◽  
Vol 8 ◽  
Author(s):  
Dees B. W. Postma ◽  
Joanne Smith ◽  
Gert-Jan Pepping ◽  
Steven van Andel ◽  
Frank T. J. M. Zaal
Keyword(s):  
Optical Acceleration

scholarly journals Optical acceleration cancellation: a viable interception strategy?

2003 ◽  
Vol 89 (6) ◽  
pp. 415-425 ◽  
Author(s):  
L. A. Rozendaal ◽  
A. J. (Knoek) van Soest
Keyword(s):  
Optical Acceleration

Hybrid-integrated optical acceleration seismometer and its digital processing system

2005 ◽  
Author(s):  
De En ◽  
Caihe Chen ◽  
Yuming Cui ◽  
Donglin Tang ◽  
Zhengxi Liang ◽  
...  
Keyword(s):  
Processing System ◽  
Digital Processing ◽  
Integrated Optical ◽  
Optical Acceleration

Development of a new optical acceleration sensor

2007 ◽  
Author(s):  
Shuhai Jia ◽  
Jia Yang ◽  
Weijun Kong ◽  
Yanfen Du
Keyword(s):  
Acceleration Sensor ◽  
Optical Acceleration

The Optics and Actions of Catching Fly Balls: Zeroing Out Optical Acceleration

1992 ◽  
Vol 4 (4) ◽  
pp. 199-222 ◽  
Author(s):  
Claire F. Michaels ◽  
Raoul R.D. Oudejans
Keyword(s):  
Optical Acceleration

scholarly journals Time-to-passage judgments on circular trajectories are based on relative optical acceleration

2001 ◽  
Vol 63 (7) ◽  
pp. 1153-1170 ◽  
Author(s):  
Dirk Kerzel ◽  
Heiko Hecht ◽  
Nam-Gyoon Kim
Keyword(s):  
Optical Acceleration

Application of Wavelet Analysis in Denoising Seismic Data

2014 ◽  
Vol 530-531 ◽  
pp. 540-543 ◽  
Author(s):  
Qing Yi Liu
Keyword(s):  
Wavelet Analysis ◽  
Seismic Data ◽  
Random Noise ◽  
The Novel ◽  
Analysis Method ◽  
Denoising Method ◽  
Standard Methods ◽  
Useful Signal ◽  
Acceleration Sensors ◽  
Optical Acceleration

The random noise is the kind of noise with wide frequency band in seismic data detected by the optical acceleration sensors. The noises influence and destroy the useful signal of the seismic information. There are a lot of methods to remove noise and one of the standard methods to remove the noise of the signal was the fast Fourier transform (FFT) which was the linear Fourier smoothing. In this paper, the novel denoising method based on wavelet analysis was introduced. The denoising results of seismic data with the noise with FFT method and wavelet analysis method, respectively. SNRs of the signal with noise, FFT denoisng and wavelet analysis denoising are-8.69, -1.13, and 8.27 respectively. The results show that the wavelet analysis method is prior to the traditional denoising method. The resolution of the seismic data improves.

Design and Simulation of Novel MEMS Optical Acceleration Sensor

2007 ◽  
Author(s):  
Shuhai Jia ◽  
Weijun Kong ◽  
Jia Yang ◽  
Yigui Li
Keyword(s):  
Mass Production ◽  
Signal To Noise Ratio ◽  
Low Cost ◽  
Dynamic Performance ◽  
Fresnel Diffraction ◽  
Acceleration Sensor ◽  
Signal To Noise ◽  
Numerical Simulator ◽  
Micro Lens ◽  
Optical Acceleration

A novel MEMS optical acceleration sensor based on a Fresnel diffraction micro-lens is designed in this paper, which is suitable to be used in the fly-by-light system of aviation. The principle of sensor is described. The dynamic performance design of sensor is presented. The constant of silicon micro spring and natural frequency is calculated by using the numerical simulator (ANSYS 8.0) of finite element method. Because the design of the sensor integrates a Fresnel diffraction lens, the optical throughput is high, which brings the advantage of higher signal-to-noise ratio with respect to photon noise. The design of the sensor is well suitable for mass production with normal process of MEMS a low cost. The proof-of-Principle fabrication and experiments show that the principle of this new MEMS optical acceleration sensor is correct.

scholarly journals Optical Acceleration Measurement Method with Large Non-ambiguity Range and High Resolution via Synthetic Wavelength and Single Wavelength Superheterodyne Interferometry

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3417 ◽  
Author(s):  
Qianbo Lu ◽  
Dexin Pan ◽  
Jian Bai ◽  
Kaiwei Wang
Keyword(s):  
High Resolution ◽  
Measurement Method ◽  
Phase Measurement ◽  
Optical Modulators ◽  
Acceleration Measurement ◽  
Real Time Measurement ◽  
Narrow Bandwidth ◽  
Measurement Resolution ◽  
Good Agreement ◽  
Optical Acceleration

Interferometric optomechanical accelerometers provide superior resolution, but the application is limited due to the non-ambiguity range that is always less than half of the wavelength, which corresponds to the order of mg. This paper proposes a novel acceleration measurement method based on synthetic wavelength and single wavelength superheterodyne interferometry to address this issue. Two acousto-optical modulators and several polarizers are introduced to the two-wavelength interferometry to create four beams with different frequencies and polarization states, and two ultra-narrow bandwidth filters are used to realize the single wavelength measurement simultaneously. This technique offers the possibility to expand the non-ambiguity range without compromising the high resolution. Also, the superheterodyne phase measurement and the corresponding processing algorithm are given to enable real-time measurement. A prototype is built and the preliminary experimental results are compared with the simulation results, showing good agreement. The results prove an estimated acceleration measurement resolution of around 10 μg and a non-ambiguity range of larger than 200 mg, which is more than 100 times that of the single wavelength-based optical accelerometer.

Sign in / Sign up

Export Citation Format

Share Document