Uncooled 160×120 microbolometer IR FPA based on sol-gel VO x

J Infrared Milli Terahz Waves

Cherkassky

Choporova

et al. 2011

Gradually appearing high-power terahertz sources require the development of adequate imaging techniques. This paper describes four imaging techniques (with a thermal recorder, temperature-sensitive phosphor plates, a visible-light thermal sensitive Fizeau interferometer, and an uncooled microbolometer array) applied with the Novosibirsk terahertz free electron laser as a radiation source. The space and time resolutions of the devices were examined thoroughly. Examples of the application of these techniques, including in-line holography and real-time moving-objects detection, are given.

Section: Microbolometer Arraymentioning

confidence: 99%

Real-Time Imaging Using a High-Power Monochromatic Terahertz Source: Comparative Description of Imaging Techniques with Examples of Application

J Infrared Milli Terahz Waves

Cherkassky

Choporova

et al. 2011

“…A small array size (128 × 128 elements) limits the applicability of the thermal recorder in terahertz imaging, but a high repetition rate (up to 50 Hz) enables employment of the device in laser beam tracing. An uncooled 160 × 120 vanadium oxide microbolometer focal plane array (FPA) with a germanium window and physical dimensions of 8.2 × 6.1 mm 2 , initially developed by Rzhanov Institute of Semiconductor Physics for detection of mid-IR radiation [32], was adapted to imaging of terahertz radiation [28]. Since the FPA is sensitive directly to terahertz radiation, it turned out to be one of the best terahertz imagers.…”

Section: Thz Beam Detection and Imagingmentioning

confidence: 99%

Novosibirsk terahertz free electron laser: instrumentation development and experimental achievements

Кулипанов

Винокуров

2010

Meas. Sci. Technol.

124

Nowadays, the Novosibirsk free electron laser (NovoFEL) is the most intense radiation source in the terahertz spectral range. It operates in the continuous mode with a pulse repetition rate of up to 11.2 MHz (5.6 MHz in the standard mode) and an average power of up to 500 W. The radiation wavelength can be precisely tuned from 120 to 240 mm with a relative line width of 0.3-1%, which corresponds to the Fourier transform limit for a micropulse length of 40-100 ps. The laser radiation is plane-polarized and completely spatially coherent. The radiation is transmitted to six user stations through a nitrogen-filled beamline. Characteristics of the NovoFEL radiation differ drastically from those of conventional low-power (and often broadband) terahertz sources, which enables obtaining results impossible with other sources, but necessitates the development of special experimental equipment and techniques. In this paper, we give a review of the instrumentation developed for control and detection of high-power terahertz radiation and for the study of interaction of the radiation with matter. Quasi-optic elements and systems, one-channel detectors, power meters, real-time imagers, spectroscopy devices and other equipment are described. Selected experimental results (continuous optical discharge, material and biology substance ablation, real-time imaging attenuated total reflection spectroscopy, speckle metrology, polarization rotation by an artificial chiral structure, terahertz radioscopy and imaging) are also presented in the paper. In the near future, after commissioning another four electron racetracks and two optical resonators, intense radiation in the range from 5 to 240 μm will be available for user experiments.

“…Vanadium oxide 160×120 pixel matrix was designed for the operation in the middle infrared spectral region (8 -14 µm). The fabrication technology and operational characteristics of the matrix in this spectral region are described in paper [3]. In this paper we describe the application of this matrix for the recording of the monochromatic radiation in the spectral range 130 -150 µm.…”

Section: Matrix Descriptionmentioning

confidence: 99%

Terahertz imaging with a 160x120 pixel microbolometer 90-fps camera

2007 Joint 32nd International Conference on Infrared and Millimeter Waves and the 15th International Conference on Terahertz El

Dem’yanenko

Esaev

2007

An uncooled micromolometer matrix camera has been developed for IR and THz high-speed imaging. The 120x160 matrix consists of resistive vanadium oxide elements on a silicon nitride bridge. The element size is 46x46 micron at the array period of 51 micron. We describe device fabrication process and matrix operational characteristics. Application of the camera in quasi-optical systems with Novosibirsk terahertz free electron laser as a radiation source is described. Recording rate up to 90 frames per second has been achieved.Index Terms-Free electron laser, microbolometer matrix, terahertz imaging.