Yossi Ben-Aderet

Bio: Yossi Ben-Aderet is an academic researcher from Ariel University. The author has contributed to research in topics: Impulse response & Temporal resolution. The author has an hindex of 5, co-authored 8 publications receiving 38 citations.

Efficient impulse response reconstruction from the amplitude spectrum

Abstract: We suggest adopting an efficient digital signal processing algorithm, which includes several fast Fourier transforms, to efficiently reconstruct the impulse response of a diffusive medium from its amplitude spectrum. It is also demonstrated that the singularities, which appear in the phase spectrum reconstruction, can be easily eliminated through the implementation of at least two types of data padding.

Impulse-response reconstruction of a scattering medium with the Kramers-Kronig method

Abstract: The Kramers-Kronig (KK) algorithm is implemented for the first time to obtain the optical impulse response of a diffusive medium and detect a concealed object. We achieve sub-picosecond resolution with simple fiber-optic (c-band) test equipment.

Kramers-Kronig imaging of diffuse media and embedded objects

Abstract: The Kramers-Kronig technique is used to reconstruct the impulse-response of a diffusive media with picosecond resolution. We demonstrate the ability to image an object within clothing at a distance of 3m from the detection system.

Methods and devices for analyzing material properties and detecting objects in scattering media

Abstract: Disclosed is a method for determining an phase spectrum θ(ω) of the complex spectral transfer function H(ω) of a medium. In some embodiments, the method is applied for detecting or imaging an object screened by scattering medium or for determining a refractive index spectrum of a material.

Reconstructing the impulse response of a diffusive medium with the Kramers-Kronig relations

Abstract: The Kramers-Kronig (KK) algorithm, useful for retrieving the phase of a spectrum based on the known spectral amplitude, is applied to reconstruct the impulse response of a diffusive medium. It is demonstrated by a simulation of a 1D scattering medium with realistic parameters that its impulse response can be generated from the KK method with high accuracy.

Optical and terahertz spectra analysis by the maximum entropy method.

Abstract: Phase retrieval is one of the classical problems in various fields of physics including x-ray crystallography, astronomy and spectroscopy It arises when only an amplitude measurement on electric field can be made while both amplitude and phase of the field are needed for obtaining the desired material properties In optical and terahertz spectroscopies, in particular, phase retrieval is a one-dimensional problem, which is considered as unsolvable in general Nevertheless, an approach utilizing the maximum entropy principle has proven to be a feasible tool in various applications of optical, both linear and nonlinear, as well as in terahertz spectroscopies, where the one-dimensional phase retrieval problem arises In this review, we focus on phase retrieval using the maximum entropy method in various spectroscopic applications We review the theory behind the method and illustrate through examples why and how the method works, as well as discuss its limitations

Quasi-ballistic imaging through a dynamic scattering medium with optical-field averaging using Spectral-Ballistic-Imaging

Abstract: We measure the sub-picosecond optical impulse response of a system consisting of a varying 1D diffusive medium and a stationary hidden object. It is shown that by averaging the temporal optical field response of a diffusive medium (as opposed to the optical intensity response) the signal-to-noise ratio of the object’s reflection can be improved considerably. The Spectral-Ballistic-Imaging technique is used to reconstruct the optical-field impulse response with a 200fs temporal resolution.

Optical imaging of hidden objects behind clothing

Abstract: Optical impulse-response characterization of diffusive media can be of importance in various applications, among them optical imaging in the security and medical fields. We present results of an experimental technique that we developed for acquiring the impulse response, based upon the Kramers–Kronig algorithm, and have been applied for optical imaging of objects hidden behind clothing. We demonstrate three-dimensional imaging with 5mm depth resolution between diffusive layers.