A REVIEW STUDY ON THE APPLICATION OF AMMONIA SENSORS

  • Chethan G S

Abstract

Using multiple sensing concepts, several articles have been published on gas sensors for various sensor applications. Sensors and sensor systems for gaseous ammonia are the subject of this study. There are many sources of ammonia, apart from its natural origin, such as the chemical industry or extreme life-stock. The research we are discussing here discusses numerous fields of operation for ammonia sensors or measuring systems and various techniques available for the manufacture of selective ammonia sensing devices. Solid-state ammonia sensors are not adequately sensitive if very low concentrations are to be measured, such as less than 2 ppb for environmental testing and 50 ppb for diagnostic breath analysis. In comparison, other gases that are frequently available at far higher concentrations lack the necessary selectivity. Optical techniques that enable usage lasers are often broad and costly. Indirect principles of measurement have been identified in literature that appear to be very suitable as tools for ammonia sensing. These devices are ideal for miniaturisation and integration to make them suitable for calculating the small amounts of gas that are typically available in medical applications, such as instruments for diagnostic breath analysis.

Published
2019-10-30
Section
Articles