Download 80 Years of Research at the Philips Natuurkundig by Marc J. de Vries, Marc J. Vries PDF

By Marc J. de Vries, Marc J. Vries

In view that global warfare I, the Natuurkundig Laboratorium has been a vital middle of business study for Philips, one of many world’s biggest electronics businesses. during this examine, Marc J. de Vries demonstrates how the historical past of the laboratory may also help us comprehend vital alterations within the construction and makes use of of expertise within the 20th century. Breaking their research into 3 classes, each one characterised by means of diverse examine pursuits and ways, the authors increase this common background with specified case reports. the outcome can be of price to somebody learning the background and philosophy of expertise.

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Additional resources for 80 Years of Research at the Philips Natuurkundig Laboratorium (1914-1994): The Role of the Nat. Lab. at Philips

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Transmitter tubes were intended for a totally different market than receiver tubes. Radio receiver sets were to be sold to consumers, but transmitter tubes for radio broadcasting were destined for professional use. With this 38 80 years of research at the philips natuurkundig lab. Radio receiver tuned radio frequency aerial rf amp. loudspeaker detector af amp. 1000 kHz superheterodyne aerial rf amp. mixer 1000 kHz i-f amp. detector 456 kHz local oscillator af amp. loudspeaker Figure 4. Comparison of the tuned radio frequency (straight) radio receiver and the super-heterodyne (super-het).

In all cases glass, vacuum and gas discharges are important. In the first place it is appropriate to mention here the gas discharge lamps. The early days of work on gas discharges have been described in the previous chapter. To make a gas discharge lamp, not only gas discharges were needed but also a mechanism to transform the gas discharge radiation into visible light of the right colours. In 1923 the physicists W. de Groot and C. Zwikker were appointed to work on this in the laboratory. 13 The green light that this lamp produced illuminated the Philips light tower in Eindhoven for a number of years.

Lab. was thus able to catch up with developments unfolding in other companies. Lab. would substantially extend its research programme. One by one we will consider the elements of the total radio system that the laboratory worked on, namely the receiver, the transmitter, and the aspect of propagating of the signal through the atmosphere. The signal in the radio receiver had to be amplified. For this purpose another type of tube was required, namely an amplifier tube. An important invention in the field of radio amplifier tubes was the Pentode.

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