期刊
SENSORS
卷 12, 期 6, 页码 8338-8354出版社
MDPI
DOI: 10.3390/s120608338
关键词
multimodal sensor; electrical conductivity sensor; pH sensor; temperature sensor; crosstalk; simultaneous measurement; real time measurement; rock wool; agriculture
资金
- Global COE Program Frontiers of Intelligent Sensing from the Ministry of Education, Culture, Sports, Science and Technology
- Coalition Research Program for Agriculture and Engineering
- National Institute of Vegetable and Tea Science (NIVTS) in Taketoyo
- Advanced Domestic Animal Management System for Practical Application Program
Making several simultaneous measurements with different kinds of sensors at the same location in a solution is difficult because of crosstalk between the sensors. In addition, because the conditions at different locations in plant beds differ, in situ measurements in agriculture need to be done in small localized areas. We have fabricated a multimodal sensor on a small Si chip in which a pH sensor was integrated with electrical conductivity (EC) and temperature sensors. An ISFET with a Si3N4 membrane was used for the pH sensor. For the EC sensor, the electrical conductivity between platinum electrodes was measured, and the temperature sensor was a p-n junction diode. These are some of the most important measurements required for controlling the conditions in plant beds. The multimodal sensor can be inserted into a plant bed for in situ monitoring. To confirm the absence of crosstalk between the sensors, we made simultaneous measurements of pH, EC, and temperature of a pH buffer solution in a plant bed. When the solution was diluted with hot or cold water, the real time measurements showed changes to the EC and temperature, but no change in pH. We also demonstrated that our sensor was capable of simultaneous in situ measurements in rock wool without being affected by crosstalk.
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