Alphatron Vacuum Gauge Principle

  • Cold cathode gauges are costlier comparatively.

  • Hot cathode gauges gets oxidised if oxygen is present. Also analyte gas may dissociate at high temperature.

  • Alphatron ionization gauge provides cheap alternative in decomposable environment.

  • Here an alpha particle emmiter is used to ionise the gas.The emmiter is positively-biased to collect negative ions which are generated by the impact of positively charged alpha-particle.

  • The current generated is proportional to degree of vacuum inside gauge. A voltmeter measures voltage across resistor. It is also used as smoke detectors.


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