Wideband multiplier correlator

Allen, L. R.; Frater, R. H.

doi:10.1049/piee.1970.0284

Cited by 5 publications

(3 citation statements)

References 2 publications

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“…For delays up to about 1 s, lengths of coaxial cable or optical fiber have been used. The design of analog multiplying circuits for correlators has been discussed by Allen and Frater (1970). An example of a broadband analog correlator is described by Padin (1994).…”

Section: Delay and Correlator Subsystemsmentioning

confidence: 99%

System Design

Thompson¹,

Moran²,

Swenson³

2017

Astronomy and Astrophysics Library

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Section: Delay and Correlator Subsystemsmentioning

confidence: 99%

System Design

Thompson¹,

Moran²,

Swenson³

2017

Astronomy and Astrophysics Library

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“…In particular, a transistorized version of the linear multiplier, a key component of the correlator, was developed by L.R. Allen and R.H. Frater (Allen & Frater 1970). The resulting improvement in the stability of the correlator was vital for the observations of fainter stars towards the end of the stellar programme.…”

Section: The Stellar Programmementioning

confidence: 99%

Robert Hanbury Brown. 31 August 1916 – 16 January 2002 Elected FRS 1960

Davis

Lovell

2003

Biogr. Mems Fell. R. Soc.

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Robert Hanbury Brown was born on 31 August 1916 in Aruvankadu, Nilgiri Hills, South India; he was the son of an Officer in the Indian Army, Col. Basil Hanbury Brown, and of Joyce Blaker. From the age of 3 years Hanbury was educated in England, initially at a School in Bexhill and then from the ages of 8 to 14 years at the Cottesmore Preparatory School in Hove, Sussex. In 1930 he entered Tonbridge School as a Judde scholar in classics. Hanbury's interests turned to science and technology, particularly electrical engineering, and after two years he decided that he would seek more appropriate education in a technical college. His decision was accelerated by the fact that after the divorce of his parents his mother had married Jack Lloyd, a wealthy stockbroker, who in 1932 vanished with all his money and thus Hanbury felt he should seek a career that would lead to his financial independence. For these reasons Hanbury decided to take an engineering course at Brighton Technical College studying for an external degree in the University of London. At the age of 19 he graduated with a first-class honours BSc, taking advanced electrical engineering and telegraphy and telephony. He then obtained a grant from East Sussex and in 1935 joined the postgraduate department at the City & Guilds, Imperial College. In 1936 he obtained the Diploma of Imperial College (DIC) for a thesis on oscillators He intended to continue his course for a PhD but a major turning point in his career occurred when he was interviewed during his first postgraduate year by Sir Henry Tizard FRS, Rector of Imperial College. Hanbury explained to Tizard that he was following up some original work by Van der Pol on oscillator circuits without inductance and hoped, ultimately, to combine an interest in radio with flying. In fact, Tizard had already challenged him about the amount of time he spent flying with the University of London Air Squadron. Tizard told Hanbury to see him again in a year's time and that he might then have a job for him. In fact, within three months Tizard accosted Hanbury and said he had an interesting research project in the Air Ministry for him. After an interview by R.A. (later Sir Robert) Watson-Watt (FRS 1941), Hanbury was offered a post at the Radio Research Board in Slough. His visit to Slough was brief; he was soon told to report to Bawdsey Manor in Suffolk, which he did on 15 August 1936. Thereby, unaware of what Tizard had in mind for him, Hanbury's career as one of the pioneers of radar began.

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“…Hanbury Brown and Twiss [7] and later by Allen and Frater [8]. We adopted their approach with newer electronics and detectors to obtain better stability and greater bandwidth.…”

Section: Construction Of the Interferometermentioning

confidence: 99%

An intensity interferometer for soft x rays

Yang

McNulty

Gluskin

1995

Review of Scientific Instruments

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We designed and built an intensity interferometer to characterize the spatial coherence of a soft x-ray undulator beam. The beam source size and shape can be determined from the measured coherence function. The instrument is 400 mm long and is mounted on a standard 204-mm diameter flange. This compact design is readily adaptable to other beamlines with sources of sufficient spectral brightness. Details of the interferometer design and performance are presented. We anticipate that when this technique is mature, it will provide a useful diagnostic for high brightness x-ray beams.

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Wideband multiplier correlator

Cited by 5 publications

References 2 publications

System Design

System Design

Robert Hanbury Brown. 31 August 1916 – 16 January 2002 Elected FRS 1960

An intensity interferometer for soft x rays

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