Point Spread Function (PSF), Modulation Transfer Function (MTF) and Ensquared Energy (EE) are important
performance indicators of optical systems for surveillance, imaging and target tracking applications. We report on the
development of a new measurement method which facilitates fast real time measurement of the two dimensional PSF
and related performance parameters of a MWIR optical module under room temperature as well as under extreme
temperature conditions. Our new measurement setup uses the law of reversibility of optical paths to capture a highly
resolved, magnified image of the PSF. By using of an easy add-on thermally insulating enclosure the optical module can
be exposed to and measured under both variable high and low temperatures (-50°C up to 90°C) without any external
impact on the measurement. Also line of sight and various off-axis measurements are possible. Common PSF and MTF
measurement methods need much more correction algorithms, whilst our method requires mainly a pinhole diameter
correction only and allows fast measurements of optical parameters under temperature as well as fast and easy
adjustment. Additionally comparison of the captured, highly resolved PSF with optical design data enables purposeful
theoretical investigation of occurring optical artifacts.
KEYWORDS: Chemical elements, 3D image processing, Sensors, Stereoscopic cameras, Digital micromirror devices, 3D metrology, Cameras, Micromirrors, 3D acquisition, Imaging systems
This paper at hand describes in details the work that has been carried out for fusing a commercial micro mirror sampling
element with TOF acquisition methods and known Hadamard multiplexing techniques for implementation of fast and
SNR optimized 3D image capture. The theoretical basics of TOF and Hadamard technique are presented and will be
complemented by theoretical explanation of utilizing them for 3D volumetric image generation. Finally measurement
results of scene image acquisition are going to be demonstrated and discussed as well as expanded by considerations
about possible applications in THz-imaging and the following research steps.
A compact dual mode seeker is under development at Diehl BGT Defence (DBD) addressing autonomous guidance, target detection and classification/identification for extended air defence (EAD) and ballistic missile defence (BMD). The dual mode sensor consists of an imaging infrared sensor and an imaging LADAR sensor both in snapshot mode. This paper presents the concept of the dual mode sensor and shows the current development status. Critical components such as a compact laser source, fiber-array for image plane sampling, and wavelength selective infrared beam splitter are presented in detail. Single Spot and 3D-LADAR-measurements were performed with a seeker lab-setup to demonstrate the system.
A compact dual mode sensor is under development at BGT addresssing autonomous guidance, target detection and classification/identification for everal military and civilian applications. The dual mode sensor consists of an imaging infrared sensor and an imagin Ladar sensor both in snapshot mode. This paper presents the concept of the dual mode sensor and shows the current development status. Critical components such as a compact laser source, fiber-array for image plane sampling, wavelength selective infrared beam splitter and micro-lens arrays for Ladar field-of-view steering are presented in detail.
KEYWORDS: Waveguides, Near field scanning optical microscopy, Near field optics, Sensors, Atomic force microscopy, Microfabrication, Scanning probe microscopy, Prisms, Silicon, Micromachining
The paper presents a new concept of a micromachined integrated sensor for combined atomic force/near field optical microscopy. The sensor consists of a microfabricated cantilever with an integrated waveguide and a transparent near field aperture tip. The advantage compared to the fiber based near field tips is the high reproducibility of the aperture and the control of the tip-sample distance by the AFM-channel. The aperture tip is fabricated in a reliable batch process which has the potential for implementation in micromachining processes of scanning probe microscopy sensors and therefore leads to new types of multifunctional probes. For evaluation purposes, the tip was attached to an optical fiber by a microassembly setup and subsequently installed in a near-field scanning optical microscope. First measurements of topographical and optical near-field patterns demonstrate the proper performance of the hybrid probe.
KEYWORDS: Waveguides, Near field scanning optical microscopy, Near field optics, Sensors, Microfabrication, Scanning probe microscopy, Atomic force microscopy, Aluminum, Prisms, Near field
The paper presents a new concept of a micromachined integrated sensor for combined atomic force/near field optical microscopy. The sensor consists of a microfabricated cantilever with an integrated waveguide and a transparent near field aperture tip. The advantage compare to the fiber based near field tips is the high reproducibility of the aperture and the control of the tip-sample distance by the AFM-channel. The key process consists in a novel micromachined aperture tip. The aperture tip is fabricated in a reliable batch process which has the potential for implementation in micromachining processes of scanning probe microscopy sensors and therefore leads to new types of multifunctional probes. For evaluation purposes, the tip was attached to an optical fiber by a microassembly setup and subsequently installed in a near-field scanning optical microscopy. First measurements of topographical and optical near-field patterns demonstrate the proper performance of the hybrid probe.
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