A radiosonde using a humidity sensor array with a platinum resistance heater and multi-sensor data fusion - PubMed
- ️Tue Jan 01 2013
A radiosonde using a humidity sensor array with a platinum resistance heater and multi-sensor data fusion
Yunbo Shi et al. Sensors (Basel). 2013.
Abstract
This paper describes the design and implementation of a radiosonde which can measure the meteorological temperature, humidity, pressure, and other atmospheric data. The system is composed of a CPU, microwave module, temperature sensor, pressure sensor and humidity sensor array. In order to effectively solve the humidity sensor condensation problem due to the low temperatures in the high altitude environment, a capacitive humidity sensor including four humidity sensors to collect meteorological humidity and a platinum resistance heater was developed using micro-electro-mechanical-system (MEMS) technology. A platinum resistance wire with 99.999% purity and 0.023 mm in diameter was used to obtain the meteorological temperature. A multi-sensor data fusion technique was applied to process the atmospheric data. Static and dynamic experimental results show that the designed humidity sensor with platinum resistance heater can effectively tackle the sensor condensation problem, shorten response times and enhance sensitivity. The humidity sensor array can improve measurement accuracy and obtain a reliable initial meteorological humidity data, while the multi-sensor data fusion technique eliminates the uncertainty in the measurement. The radiosonde can accurately reflect the meteorological changes.
Figures

System block diagram.

Photograph of the platinum resistance wire and temperature sensor.

Regression analysis result.

The structure of the humidity sensor.

Fabrication flow of the humidity sensor: (a1) Snakelike electrode; (b1) Dielectric layer; (c1) Bottom electrode; (d1) Silicon cup; (e1) Sensing film; (f1) Upper electrode.

Fabrication flow of planar structure: (a2) Snakelike electrode; (b2) Dielectric layer; (d2) Bottom electrode; (e2) Sensing film; (f2) Upper electrode.

Photograph of the humidity sensor.

Humidity generator block diagram.

Measured results of the humidity sensor at +20 °C.

Measured results of the humidity sensor at different temperatures.

Relation between humidity sensitivity and temperature.

Regression equation result.

Photographs of the first part system.

Microwave transmitting block diagram.

Microwave receiver unit block diagram.

Photograph of the microwave receiver system.

Radiosonde program software flow chart.

Microwave communication protocol.

PC program software flow chart.

The experiment preparation process.

Pressure change over time curve.

Temperature change over time curve.

Humidity change over time curve.

Humidity and temperature change over time curve.
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