Peter B. Jacquemin Overview
- Peter Jacquemin offers a systems engineering multi-discipline approach to rapid development of innovative complex systems
- Design of precision opto-electronic, electro-mechanical, and optical guidance systems
- Acoustics and holographic sound system design
- Dynamic target acquisition, tracking, and pointing optical systems with nested feedback control design
- Image processing for target tracking and medical diagnostics
- Geometric optics and wave optics applications experience with telescopes, microscopes, holography, interferometry, and optical coherence tomography
- Derived unique three-dimensional tomographic reconstruction algorithm with limited viewing angle constraints
- Designed, fabricated, and evaluated an innovative holographic microscope
- Designed a coherent beam interference method to detect concealed objects in luggage
Based on my research, applications for holography are expanding past photographic reconstruction and into diagnostic measurement for aerospace optics, medical photonics, and machine vision in industry. Some applications that I have journal publications are: 1) The CSLH (Confocal Scanning Laser Holography) microscope for measuring temperature and phase composition in fluids and micro-biological cells, 2) The OCT (Optical Coherence Tomography) microscope for measuring layers of depth through the retina, 3) The ACHM (Acoustic Confocal Holography Microscope) for detecting cancer and diseased tissue given an extremely small scanning angle or viewing window, and 4) Luggage scanning for detecting concealed object using coherent beam interference.
Methods of holography, which provide sub-wavelength resolution, can be applied to measuring: nano-meter displacement, optics surface profile, Doppler velocity, nano-radian angular rotation, phase contrast, refractive index, composition, temperature, pressure, and acoustic impedance.
The similarities between the OCT (Optical Coherence Tomography) microscope and the CSLH (Confocal Scanning Laser Holography) developed in my research are that both use interferometers (OCT microscope uses a Michelson interferometer and the CSLH microscope uses a Mach-Zehnder interferometer), scanning optics, and confocal optics.
The complex CSLH microscope that I independently designed, built, and evaluated in the laboratory has over 60 optical components which comprises a Keplerian beam expander, wavefront splitter, dual axis scanning mirrors with periscope pupil relay lenses, Mach-Zehnder optical loop, confocal optics, telecentric lenses, and beam overlapping projector optics.
Some examples of my research across multiple applied physics and engineering disciplines are:
- Derived various methods for small viewing angle tomographic reconstruction which provides three-dimensional information for beams that pass through the entire specimen with the cumulative effects along the beam path recorded on a hologram. Scanning the laser probe through the specimen provides data for reconstructing three-dimensional information along the optical propagation depth axis. Small angle reconstruction is now possible with scan angles that are less than 180° and approaching the numerical aperture or cone angle of the beam probing the specimen. This novel reconstruction method allows for three-dimensional information to be obtained with no scanning mechanisms in some circumstances and restricted scanning about a limited FOV (Field-of-View) in other circumstances. Current applications for limited viewing angle three-dimensional tomographic reconstruction from a single viewpoint window are: measurement of fluid temperature using the CSLH (Confocal Scanning Laser Holography) microscope and detecting cancer cells using the ACHM (Acoustic Confocal Holography Microscope) ultra-sonic diagnostic instrument. I have developed these technologies and published numerous journal papers on the research and design that supports these new capabilities.
- Designed adaptive gain feedback controllers with superior performance to industry standard PID (Proportional-Integral-Derivative) variable gain controllers across the spectral bandwidth of the system. The innovative adaptive gain feedback controller has an auto-tuning feature to the dynamic properties of the system and switch-mode operation. Switch-mode alternates high-gain open loop control between closed loop control which minimizes both rise time and settling time. This provides both increased bandwidth with improved stability and minimal power consumption.
- Derived various medical image processing algorithms such as the bilinear z-transform method, high-order Fourier transform method, finite difference equation technique, and the state-space integration method.
- Produced an OCT (Optical Coherence Tomography) image processing algorithm that reconstructs images of the retina from interferometric data using methods of de-convolution and specially derived image filters.