温室中温度和湿度无线传感系统的设计与应用<br>Design and Implementation of a Wireless Integrated Temperature and Humidity Sensing System for Greenhouse Application

Multirotor unmanned aerial vehicles (MUAVs) are becoming more prominent for diverse real-world applications due to their inherent hovering ability, swift manoeuvring and vertical take-off landing capabilities. Nonetheless, to be entirely applicable for various obstacle prone environments, the conventional MUAVs may not be able to change their configuration depending on the available space and perform designated missions. It necessitates the morphing phenomenon of MUAVS, wherein it can alter their geometric structure autonomously. This article presents the development of a morphed MUAV based on a simple rotary actuation mechanism capable of driving each arm’s smoothly and satisfying the necessary reduction in workspace volume to navigate in the obstacle prone regions. The mathematical modelling for the folding mechanism was formulated, and corresponding kinematic analysis was performed to understand the synchronous motion characteristics of the arms during the folding of arms. Experiments were conducted by precisely actuating the servo motors based on the proximity ultrasonic sensor data to avoid the obstacle for achieving effective morphing of MUAV. The flight tests were conducted to estimate the endurance and attain a change in morphology of MUAV from “X-Configuration” to “H-Configuration” with the four arms actuated synchronously without time delay.

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A ±0.15% RH Inaccuracy Humidity Sensing System With ±0.44 °C (3σ) Inaccuracy On-Chip Temperature Sensor

IEEE Sensors Journal ◽

10.1109/jsen.2020.3017508 ◽

2021 ◽

Vol 21 (2) ◽

pp. 2115-2123

Author(s):

Jaehoon Jun ◽

Sangmin Shin ◽

Minsung Kim ◽

Yongjoon Ahn ◽

Suhwan Kim

Keyword(s):

Temperature Sensor ◽

Humidity Sensing ◽

Chip Temperature ◽

Sensing System ◽

On Chip

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Highly Sensitive Temperature and Humidity Sensor Based on Carbon Nanotube-Assisted Mismatched Single-Mode Fiber Structure

Micromachines ◽

10.3390/mi10080521 ◽

2019 ◽

Vol 10 (8) ◽

pp. 521 ◽

Cited By ~ 3

Author(s):

Yuan ◽

Qian ◽

Liu ◽

Wang ◽

Keyword(s):

Carbon Nanotube ◽

Humidity Sensor ◽

Single Mode ◽

Small Region ◽

Single Mode Fiber ◽

Fiber Structure ◽

Humidity Sensing ◽

Highly Sensitive ◽

Temperature And Humidity ◽

Stable Performance

Here we report on a miniaturized optical interferometer in one fiber based on two mismatched nodes. The all-fiber structure shows stable performance of temperature and humidity sensing. For temperature sensing in large ranges, from 40 to 100 °C, the sensor has a sensitivity of 0.24 dB/°C, and the adjusted R-squared value of fitting result reaches 0.99461 which shows a reliable sensing result. With carbon nanotubes coating the surface of the fiber, the temperature sensitivity is enhanced from 0.24561 to 1.65282 dB/°C in a small region, and the performance of humidity sensing becomes more linear and applicable. The adjusted R-squared value of the linear fitting line for humidity sensing shows a dramatic increase from 0.71731 to 0.92278 after carbon nanotube coating, and the humidity sensitivity presents 0.02571 nm/%RH.

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