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"Time-multiplexed laser self-mixing sensor for measurement of multiple " by Bin Liu, Bo Wang et al.

The mechanical properties of materials hold significant importance in fundamental research, material, mechanical and civil engineering. These properties are often characterized by some elastic parameters, e.g., Young's modulus, shear modulus and Poisson's ratio. Self-mixing interferometry (SMI) is a unique non-destructive sensing technology that requires minimal components. In this work, we have developed a time-multiplexed fiber-coupled laser SMI sensor in conjunction with impulse excitation technique to simultaneously measure Young modulus, shear modulus and Poisson's ratio of materials. Two specimens made of brass and aluminum 6061 were assessed to validate the feasibility of the designed sensor. The measured values of Young's modulus (101.2 GPa for brass and 69.5 GPa for aluminum 6061), shear modulus (36.3 GPa for brass and 29.5 GPa for aluminum 6061), and Poisson's ratio (0.39 for brass and 0.34 for aluminum 6061) aligned with values reported in existing l ....

Elastic Moduli , Laser Interferometry , Ptical Feedback Interferometry , Optical Measurement , Self Mixing Interferometry ,

"Modeling and design of high-sensitivity dual optical feedback interfer" by Yangfan Jiang, Bin Liu et al.

Laser optical feedback interferometry (OFI) is a unique one-channel interferometric measurement technology with the advantages of compact structure, low implementation cost and easy alignment. However, it has a critical challenge that the visibility of interference fringe is often low and further induces low measurement sensitivity, especially in occasions when the optical feedback strength is feeble, e.g., biomedical and fluid detection. Recently, it has been demonstrated that period-one (P1) dynamics can enhance the measurement sensitivity by introducing extra optical feedback to form a dual optical feedback interferometry (DOFI) system. However, the details of the enhancement mechanism and how to design such a system are still required to unveil. In this paper, comprehensive discussions of designing a DOFI system with high measurement sensitivity enhanced by P1 dynamics are presented. First, based on the modified Lang-Kobayashi equations, a mathematical sensing model of a DOFI syste ....

Laser Dynamics , Ptical Feedback Interferometry , Eriod One Dynamics , Self Mixing Interferometry ,

This week Apple was granted 40 patents covering a Future Apple Pencil that could draw and write on a pad of paper, a wall and more+

Today the U.S. Patent and Trademark Office officially published a series of 44 patents that include 40 utility and 4 design patents. In this particular report we focus on a possible future Apple Pencil that could write or draw on various surfaces beyond touch displays like an iPad. Apple was also granted two iPhone 14 design patents today, and as always, we wrap up this week s granted patent report with our traditional listing of the remaining granted patents that were issued to Apple this week. ....

Trademark Office , Apple Pencil , Self Mixing Interferometry , This Week Apple Was Granted 44 Patents Coveringa Future Pencil That Could Draw And Write Ona Pad Of Paper , A Wall And More ,

"Determining System Parameters and Target Movement Directions in a Lase" by Bin Liu, Yuxi Ruan et al.

Self-mixing interferometry (SMI) is a promising sensing technology. As well as its compact structure, self-alignment and low implementation cost, it has an important advantage that conventional two-beam interferometry does not have, i.e., SMI signal fringe evolves into asymmetrical shape with increasing optical feedback level, which leads to discrimination of target movement directions for unambiguous displacement measurement possible by a single-channel interferometric signal. It is usually achieved by using SMI signals in moderate feedback regime, where the signals exhibit hysteresis and discontinuity. However, in some applications, e.g., in biomedical sensing where the target has a low reflectivity, it is hard for the SMI system to operate in a moderate feedback regime. In this work, we present comprehensive analyses on SMI signal waveforms for determining system parameters and movement directions by a single-channel weak feedback SMI signal. We first investigated the influence of t ....

Laser Sensor , Inewidth Enhancement Factor , Ptical Feedback Interferometry , Self Mixing Interferometry ,

"Micro-displacement and Profile Measurement Using a Selfmixing Interfer" by Han Wang

Abstract
Self-mixing interferometry (SMI) is a promising non-contact sensing technology, which has attracted much research attention in the last few decades. The SMI effect takes place when a small portion of laser is back-scattered from an external target and re-enters the laser diode (LD) internal cavity. A typical sensing system using an SMI configuration consists of an LD as the laser source, a target to reflect the laser, a photo diode (PD) to capture the optical signal. This configuration indicates the SMI-based sensing technology’s merits of minimum part-count scheme, low cost in implementation and ease in optical alignment. Various SMI-based sensing applications have been reported, including the measurement of displacement, velocity, vibration, laser related parameters, thickness, mechanical resonance, imaging, material parameter measurement, near-field microscopy, chaotic radar, acoustic detection, biomedical applications, etc. ....

Fast Fourier Transform , Self Mixing Interferometry , Semiconductor Laser Diode , Micro Displacement Sensing , Profile Measurement , Time Frequency Analysis , குறைக்கடத்தி லேசர் டையோடு , ப்ரொஃபைல் அளவீட்டு , நேரம் அதிர்வெண் பகுப்பாய்வு ,