Radiometer for Monitoring Agricultural Ammonia Emissions

Science & Technology Facilities Council Background
Ammonia is a pollutant which damages sensitive natural habitats and contributes to particulate pollution in urban areas. In its 2019 Clean Air Strategy, the UK government pledged to regulate to reduce ammonia emissions, nearly 90% of which come from farming.
Conventional approaches of measuring ammonia emissions require samples to be taken back to a laboratory, which is a highly laborious process that does not offer real-time measurements. Optical based point sensors suffer from memory effects due to the sticky nature of ammonia and only offer a limited view of concentration profiles. Remote optical sensors overcome this issue but require precision alignment and are cumbersome to set up and maintain.
Technology Overview
STFC has developed a radiometer concept which will provide truly remote ammonia measurements using millimetre wave technology. This is achieved by detecting and spectrally analysing the microwave radiation that is naturally emitted by ammonia molecules. This is already an established technique in astronomy. The passive microwave/millimetre wave signal detection system builds upon state-of-the-art hardware developed by RAL Space at STFC.
The radiometer is intended for use in the agricultural industry to carry out real-time remote monitoring of ammonia levels. An early warning system will flag rising ammonia levels, allowing mitigating measures to be taken. The effectiveness of these measures can then be evaluated.
Stage of Development
A concept system for radio frequency detection has been demonstrated in the lab. The next stage is to build on this design and develop an instrument specifically tailored for ammonia sensing.
Expected detectability thresholds for various atmospheric scenarios have been studied using radiative transfer simulations.
Benefits

Real-time remote ammonia level measurements
Inexpensive
Simple to use
Robust
Sensitive

Applications

Agricultural monitoring
Pipeline leak survey
Wastewater treatment plants
Chemical plants health and safety

Opportunity
STFC is looking for partners to support the next stage of technical development, through input to product development and testing opportunities for ammonia.

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