This paper uses the hardware with ZigBee standard and communication protocol, it consists of wireless sensor network in the greenhouse that can timely sample temperature, humidity, collection of environmental paramete...This paper uses the hardware with ZigBee standard and communication protocol, it consists of wireless sensor network in the greenhouse that can timely sample temperature, humidity, collection of environmental parameters. At the same time, this design uses the GPRS module, the data will be collected through the Internet and send to the PC server, and can receive control instructions from the host computer, through the adjustment of agricultural facilities valve to reverse control environment parameters.展开更多
Abstract： The homogeneous, intensity modulated salinity sensor using the photonic crystal ring resonator （PCRR） is proposed and designed for monitoring the salinity of the seawater from 0% to 100% （0 g/L to 100 g/...Abstract： The homogeneous, intensity modulated salinity sensor using the photonic crystal ring resonator （PCRR） is proposed and designed for monitoring the salinity of the seawater from 0% to 100% （0 g/L to 100 g/L） at 25℃. The concentration of the salinity in the seawater changes the refractive index of the seawater. The change in the refractive index of the seawater brings the change in the output signal intensity of the sensor as the output power and mapping the salinity level, the seawater flows inside the sensor. By detecting the salinity can be evaluated. The proposed sensor is composed of periodic Si rods embedded in an air host with a circular PCRR placed between the inline quasi waveguides. Approximately, 2.69% of output power reduction is observed for every 5% （5 g/L） increase in the salinity as the seawater has a unique refractive index for each salt level. With this underlying principle, the performance of the sensor is analyzed for different temperatures.展开更多
文摘This paper uses the hardware with ZigBee standard and communication protocol, it consists of wireless sensor network in the greenhouse that can timely sample temperature, humidity, collection of environmental parameters. At the same time, this design uses the GPRS module, the data will be collected through the Internet and send to the PC server, and can receive control instructions from the host computer, through the adjustment of agricultural facilities valve to reverse control environment parameters.
文摘Abstract： The homogeneous, intensity modulated salinity sensor using the photonic crystal ring resonator （PCRR） is proposed and designed for monitoring the salinity of the seawater from 0% to 100% （0 g/L to 100 g/L） at 25℃. The concentration of the salinity in the seawater changes the refractive index of the seawater. The change in the refractive index of the seawater brings the change in the output signal intensity of the sensor as the output power and mapping the salinity level, the seawater flows inside the sensor. By detecting the salinity can be evaluated. The proposed sensor is composed of periodic Si rods embedded in an air host with a circular PCRR placed between the inline quasi waveguides. Approximately, 2.69% of output power reduction is observed for every 5% （5 g/L） increase in the salinity as the seawater has a unique refractive index for each salt level. With this underlying principle, the performance of the sensor is analyzed for different temperatures.
