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  • Articles: DFG German National Licenses  (7)
  • 1995-1999  (7)
Source
  • Articles: DFG German National Licenses  (7)
Material
Years
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Position control system for suspended masses in laser interferometer gravitational wave detectors (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 2763-2776 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We review and present an analysis of the major issues in the design of test mass control systems for laser interferometer gravitational wave detectors. Based on this analysis, we present a design for a computer controlled modular analog servo control system which is well suited to the control of a large number of degrees of freedom in long baseline instruments. The system has been tested on an interferometer using multistage cantilever spring isolators. The system enables simple monitoring, testing, and display of many channels simultaneously, while retaining the advantages of analog proportional-integral-derivative control electronics. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145623
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Parametric back-action effects in a high-Q cyrogenic sapphire transducer (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 2435-2442 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The construction and operation of a high-quality factor microwave sapphire resonator transducer coupled to a 1 kHz niobium membrane acoustic oscillator are presented in this paper. A four-stage passive vibration isolation system was included in the design to permit the measurement of the transducer's parametric properties. The isolation system was shown to sufficiently suppress mechanical noise above 100 Hz and an upper limit to the displacement sensitivity of the transducer was measured to be 3.0±0.6×10−16 m/(square root of)Hz. The parametric behavior of the transducer with a single pump readout was measured for several transducer configurations, and the results were found to be in good agreement with theory. The measurements presented here display for the first time the complete parametric behavior in a high electrical Q system, where the transducer's bandwidth is less than the mechanical oscillator's frequency. The high stability and low losses of our system may allow the transducer to be configured as a back-action evasion or quantum nondemolition device. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147193
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Application of commercial antennas to very long baseline interferometry radio astronomy (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 995-999 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Groundstation antennas located in Western Australia have been used as elements in the Southern Hemisphere very long baseline interferometry (VLBI) experiment. These commercial antennas of 27.5 and 15 m diameter provide a very economical improvement to the imaging capability of this array and the practice of using such antennas can be extended to other sites in the Southern Hemisphere in preparation for the forthcoming space-VLBI experiments. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145634
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Southern Hemisphere automated supernova search (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 2777-2784 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The Perth Astronomy Research Group has developed an automated supernova search program, using the 61 cm Perth–Lowell reflecting telescope at Perth Observatory in Western Australia, equipped with a CCD camera. The system is currently capable of observing about 15 objects per hour, using 3 min exposures, and has a detection threshold of 18th–19th magnitude. The entire system has been constructed using low-cost IBM-compatible computers. Two original discoveries (SN 1993K, SN 1994R) have so far been made during automated search runs. This paper describes the hardware and software used for the supernova search program, and shows some preliminary results from the search system. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145624
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Cryogenic, all-sapphire, Fabry–Perot optical frequency reference (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 955-960 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: This paper presents a design for a Fabry–Perot optical frequency reference resonator which utilizes the high dimensional stability of cryogenically cooled sapphire. We show that cryogenic sapphire cavities can achieve substantial improvements in frequency stability compared with room-temperature cavities. The design of a laser stabilization system based on such a resonator is discussed. Estimates of fundamental and practical limitations on the frequency stability of such a system suggest that a fractional frequency stability of 10−16 over integration times from 10 to 104 s is possible. The fundamental limits to stability from quantum shot noise, radiation pressure fluctuations, and thermal noise are overwhelmed by practical limits which arise due to mechanical, thermal, and optical effects. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145629
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Parametric interaction of the electric and acoustic fields in a sapphire monocrystal transducer with a microwave readout (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 84 (1998), S. 6523-6527 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A sapphire monocrystal configured with a parametric microwave readout can potentially monitor the motion of its internal acoustic resonances at the precision governed by quantum mechanical fluctuations. The mechanism of transductance is due to parametric interaction between the electric and acoustic field within the crystal. This mechanism has been tested for the first time, and the theory has been verified by observing the pump frequency dependence of the acoustic quality factor. Because of the extremely low acoustic losses (Q〉107) and electrical losses (Q〉104), measurements were sensitive enough to attain positive verification at room temperature. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369023
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Sapphire test-masses for measuring the standard quantum limit and achieving quantum non-demolition (1997)
    Springer
    Applied physics 64 (1997), S. 153-166 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 0480
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract.  In this paper we show that the available technology is sufficient to measure the Standard Quantum Limit (SQL) of a low loss acoustic oscillator, with a readout based on a microwave parametric transducer. The experiment makes use of the low electrical and acoustical losses in monocrystalline sapphire and new low-noise microwave technology. The crystal acts as an electrical vibration sensor and an acoustic oscillator in one monolithic structure. We analyze two new types of such structures: (1) The sapphire bar dielectric transducer and (2) the slotted sapphire dielectric transducer. We show that with a 40–60 dB double-cavity phase-noise suppression system the SQL may be measured using the sapphire bar. For the slotted structure, the phase noise requirements are less stringent because of its smaller resonant frequency and mass. We show that the SQL of this structure may be measured with a standard parametric readout. The principle of operation is demonstrated by some simple room-temperature experiments with all results verified using finite-element analysis. Given that we can expect to measure the SQL with one of these schemes, we analyze the properties of a microwave displacement measurement system based upon a high-Q parametric transducer and a double-frequency oscillator. Such a readout system represents a practical implementation of a black action evasion (BAE) displacement sensor allowing the discrimination between the quadratures of the mechanical oscillator. We determine the set of conditions which allows the enhanced sensitivity with respect to the desired quadrature and suppressed sensitivity to the unwanted quadrature. We find that tuning of the BAE system at the particular quadrature of interest can be performed by varying the phase relationship between the microwave carriers available from the double-frequency oscillator. We establish the importance of having the frequency and the phase-control servos to maintain the optimal tuning of the micro-wave BAE readout system, as both the mechanical oscillator and the double-frequency pump oscillator are always subject to various sources of environmental interference.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400050160
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    Paper (German National Licenses)
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