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1887

Radio and Electronic Engineer

Volume 40, Issue 5, November 1970

Volumes & issues:

Volume 40, Issue 5

November 1970

Profile of a profession
Problems in bathymetric surveying presented by modern trends in shipbuilding
Designing for automatic testing: The concept and general approach
  • Author(s): W.R. Ogden  and  C.R. Thomas
  • Source: Radio and Electronic Engineer, Volume 40, Issue 5, p. 225 –232
  • DOI:  10.1049/ree.1970.0089
  • Type: Article
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  • p. 225 –232 (8)
    This paper deals with conceptual aspects of design which influence, and are influenced by, decisions to use automatic testing techniques in the factory and/or in the field. The early phasing of the influencing process is emphasized, and the importance of ‘design-for-autotest’ as a design parameter is discussed in relation to other parameters, and the case is made for its co-ordination into the varied aspects of the design requirements. These imply rationalizing design techniques, signal characteristics, equipment constructional forms and factory test organizations. Optimization of design must place a minimum brake on innovation. The applicability of automatic testing to the various stages of factory assembly, and the need to differentiate between the basic testing task and fault analysis by sub-routine, are established. Optimization of the differing requirements of factory and field call for design compromise.
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A laser machining system for making integrated circuit masks
  • Author(s): M.S. Qureshi  and  K.G. Nichols
  • Source: Radio and Electronic Engineer, Volume 40, Issue 5, p. 233 –240
  • DOI:  10.1049/ree.1970.0090
  • Type: Article
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  • p. 233 –240 (8)
    An automatically controlled laser machining system for cutting integrated circuit masks in thin films deposited as fused silica substrates is described. A high-pressure helium-neon pulsed laser is used for cutting precision edges and a continuously operated carbon-dioxide laser is used for fast machining of larger areas in the mask. Details of the machining speeds and edge precisions obtained with each laser are given. The requirements for machining masks with the aid of both lasers are discussed. Results obtained in cutting test masks are presented and it is shown that considerable saving in machining times can be effected using the system of two lasers. The need for a vector generator, to control the movements of the work tables, as a peripheral to a computer is explained. Details of an experimental high-level mask-making computer language used with the above system are given.
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The planning and commissioning of a communications satellite earth station and its integration with existing telecommunications systems
A simple data recording system with computer analysis
Plastic film capacitors
Monte-carlo simulation of an active sonar
  • Author(s): J.E. Hudson
  • Source: Radio and Electronic Engineer, Volume 40, Issue 5, p. 265 –271
  • DOI:  10.1049/ree.1970.0094
  • Type: Article
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  • p. 265 –271 (7)
    This paper describes the analysis of a non-linear sonar processing system by simple Monte-Carlo methods. The target detection capability with isotropic background noise and spatially coherent reverberation is found with attention being paid to the effects of frequency filters in the input channels from the transducers.The resolution and detection of multiple and diffuse targets is assessed under noise free conditions and with the assumption of target scintillation due to forward scattering or medium inhomogeneity.
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