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• ### Television measuring techniques

Publication Year: 1970
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First Page of the Article
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• ### An experimental laser-photochromic display system

Publication Year: 1970, Page(s):123 - 129
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A laser display system is described which can produce real-time television standard pictures, or alternatively reversible, stored images using photochromic film. The development of components for the modulation of laser beams is also described. The spatial modulators are acousto-optic diffraction cells, and the amplitude modulator uses the electro-optic effect in ADP. View full abstract»

• ### An optical fixed data store

Publication Year: 1970, Page(s):130 - 138
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An optical fixed data storage system is described which is designed to hold 4 M bits of information on each exchangeable photographic plate. The store, intended as an integral part of a computing system, enables any of 65,536 69-bit words to be retrieved with a random access time of a few microseconds. Writing time for each data plate is approximately 1 hour. To record and retrieve the data, a spo... View full abstract»

• ### Six new delay functions and their realization using active rc networks

Publication Year: 1970, Page(s):139 - 144
| | PDF (773 KB)

Six new delay functions with three right-half s-plane zeros and four lefthalf s-plane poles are obtained from the application of Budak's technique to the Bessel and Chebyshev all-pole delay functions. These are compared with three well-known similar delay functions and three of them found to have some advantages over the existing ones. Active networks, which areuseful in the realization of the fun... View full abstract»

• ### Instantaneous and time-varying spectraÂ¿an introduction

Publication Year: 1970, Page(s):145 - 152
Cited by:  Papers (7)
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Several definitions of time-varyingÂ¿, short-timeÂ¿ and instantaneousÂ¿ spectra exist. The paper relates these to the time-frequency energy distribution of a signal and to the time-varying power spectrum of a non-stationary random process. The treatment emphasizes physical interpretation, rather than mathematical rigour. View full abstract»

Publication Year: 1970
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• ### A function generator using hybrid techniques

Publication Year: 1970, Page(s):153 - 160
| | PDF (1467 KB)

The principle of operation of a novel function generator is outlined and some applications are reviewed. The basic function produced by the generator is a box-carÂ¿, or discrete, type function having fixed thresholds with respect to the input voltage, and output voltage levels that may be independently set in any segment. By using a sampling technique, linear interpolation may be applied across a... View full abstract»

• ### Cyanide gas lasers for sub-millimetric wavelengths

Publication Year: 1970, Page(s):161 - 166
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Progress is outlined in the design of c.w. and pulsed lasers, using methyl cyanide, dimethylamine and a mixture of methane and nitrogen, for use at wavelengths in the 337 Â¿m region. Output stability is stated to be a function of cathode material, gas type and pressure and discharge current for any given laser design. Brass appears to be the best cathode material. With input power at 1 kW, outputs... View full abstract»

• ### Semiconductor diodes as detectors and mixers at sub-millimetric wavelengths

Publication Year: 1970, Page(s):167 - 171
| | PDF (641 KB)

Reprinted from the Proceedings of the I.E.R.E. Conference on `Lasers and Opto-ElectronicsÂ¿ held at the University of Southampton on 25th to 28th March 1969. View full abstract»

• ### The two-frequency m.t.i. system

Publication Year: 1970, Page(s):172 - 176
| | PDF (569 KB)

Clutter motion relative to the radar may seriously degrade the efficiency of moving target indication (m.t.i.) systems used in radio location. This problem arises in shipborne radar, airborne radar, or when the clutter is being carried by the wind. Although various methods have been devised to overcome the effect, the problem still exists because these have their inherent drawbacks. As another app... View full abstract»