Design and Performance of a Broad-Band FM Demodulator with Frequency Compression

1962 ◽  
Vol 50 (12) ◽  
pp. 2436-2445 ◽  
Author(s):  
C. Ruthroff ◽  
W. Bodtmann
Keyword(s):  
Broad Band ◽  
Frequency Compression ◽  
And Performance

scholarly journals Final design and on-sky testing of the iLocater SX acquisition camera: broad-band single-mode fibre coupling

2020 ◽  
Vol 501 (2) ◽  
pp. 2250-2267
Author(s):  
J Crass ◽  
A Bechter ◽  
B Sands ◽  
D King ◽  
R Ketterer ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Near Infrared ◽  
Broad Band ◽  
Single Mode ◽  
Injection System ◽  
Single Mode Fibre ◽  
Astronomical Instruments ◽  
Final Design ◽  
Camera Design ◽  
And Performance

ABSTRACT Enabling efficient injection of light into single-mode fibres (SMFs) is a key requirement in realizing diffraction-limited astronomical spectroscopy on ground-based telescopes. SMF-fed spectrographs, facilitated by the use of adaptive optics (AO), offer distinct advantages over comparable seeing-limited designs, including higher spectral resolution within a compact and stable instrument volume, and a telescope independent spectrograph design. iLocater is an extremely precise radial velocity (EPRV) spectrograph being built for the Large Binocular Telescope (LBT). We have designed and built the front-end fibre injection system, or acquisition camera, for the SX (left) primary mirror of the LBT. The instrument was installed in 2019 and underwent on-sky commissioning and performance assessment. In this paper, we present the instrument requirements, acquisition camera design, as well as results from first-light measurements. Broad-band SMF coupling in excess of 35 per cent (absolute) in the near-infrared (0.97–1.31 ${\mu {\rm m}}$) was achieved across a range of target magnitudes, spectral types, and observing conditions. Successful demonstration of on-sky performance represents both a major milestone in the development of iLocater and in making efficient ground-based SMF-fed astronomical instruments a reality.

Design and Performance of W-Band Broad-Band Integrated Circuit Mixers

1983 ◽  
Vol 31 (3) ◽  
pp. 277-283 ◽  
Author(s):  
R.S. Tahim ◽  
G.M. Hayashibara ◽  
Kai Chang
Keyword(s):  
Integrated Circuit ◽  
Broad Band ◽  
W Band ◽  
And Performance

Performance indicators in water and sanitation for developing areas

2001 ◽  
Vol 44 (6) ◽  
pp. 127-134 ◽  
Author(s):  
P. Pybus ◽  
G. Schoeman
Keyword(s):  
Performance Indicators ◽  
Local Community ◽  
Broad Band ◽  
Business Plan ◽  
Performance Criteria ◽  
Water And Sanitation ◽  
And Performance ◽  
Threatening Situation ◽  
Sanitation Systems ◽  
Developed World

There is a move throughout the developed world to introduce benchmarking techniques to the management of water and sanitation systems. The indicators that are being considered for benchmarking purposes tend to cover a broad band of activities that are part of the scope of management of large organisations. Most of the lists that have been prepared do not really cater for the implementation and operation of small rural schemes. The greatest need is the implementation of sustainable schemes for this category of consumer. The implementation of a rural water and sanitation scheme involves the negotiation in the initial stages with the local community representatives of what the community wants and how it will be provided and operated. This may have to be preceded by a period of empowerment so that the negotiations can be conducted by informed people. At the conclusion of the negotiations a business plan can be prepared that should be implemented in association with the community. The project is at this stage mainly in the control of a professional engineer, responsible for the technical interpretation of the business plan and the management of the construction phase. Finally, after commissioning, a water service provider will be responsible for the operation, management and maintenance of the scheme on a sustainable basis. The key actions and activities are identified and performance criteria defined. As communication at the beginning of the project is a critical component, the success of this is confirmed by examination and discussion as to how much has in fact been communicated and understood correctly. Other performance indicators for the operational phase are derived from the conventional ones used in the developed world. Finally, it is important that the participants, do not see the measurement of performance as a threatening situation, but rather a stepping stone to improvement of not only performance, but also of subsequent reward.

A Minimal Controller Synthesis Algorithm for Narrow-Band Applications

2005 ◽  
Vol 219 (8) ◽  
pp. 591-607 ◽  
Author(s):  
A J Hillis ◽  
S A Neild ◽  
D P Stoten ◽  
A J L Harrison
Keyword(s):  
Vibration Isolation ◽  
Narrow Band ◽  
Broad Band ◽  
Control Synthesis ◽  
Error Signal ◽  
Engine Mounts ◽  
Common Control ◽  
Integral Action ◽  
Active Vibration ◽  
And Performance

A common control problem is that of reducing a narrow-band error signal or a narrow-band component of a broad-band error signal. The particular application described in this paper is that of active vibration isolation for automotive vehicles. The error-driven minimal control synthesis (Er-MCSI) algorithm with integral action has been applied to this problem, but is known to exhibit gain windup. The nature of the gain windup phenomenon is investigated and methods to mitigate its effects are discussed. A new controller, the narrow-band MCS (NBMCS), is developed specifically for narrow-band applications. NBMCS is based upon Er-MCSI and exploits the deterministic nature of the system disturbance. The NBMCS algorithm is shown not to suffer from the gain windup problem. The properties and performance of the Er-MCSI and NBMCS controllers are compared analytically, via simulation and experimental application, to an automotive vehicle equipped with active engine mounts.

scholarly journals An efficient broad-band mid-wave IR fiber optic light source: design and performance simulation

2013 ◽  
Vol 21 (8) ◽  
pp. 9547 ◽  
Author(s):  
A. Barh ◽  
S. Ghosh ◽  
R. K. Varshney ◽  
B. P. Pal
Keyword(s):  
Light Source ◽  
Fiber Optic ◽  
Broad Band ◽  
Performance Simulation ◽  
And Performance
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