We report on the experimental results of the combination of unique auto-correlation properties of Golay complementary code and Hadamard matrix properties of standard simplex code. The combination of the two coding techniques results in improvement of the signal-to-noise ratio (SNR) of time domain multiplexed fiber Bragg grating (TDM-FBG) sensor for temperature measurement. Previously, we have analyzed the properties of both coding techniques when deployed separately in the TDM-FBG sensor. In this case, both coding techniques result in the same amount of SNR improvement for code length longer than 31 bits. In this paper, we demonstrate the combination and simultaneous deployment of the two techniques to measure multiple FBGs under room condition (25 • C) and 50 • C temperature. The two schemes combination results in remarkable improvement of SNR and still retains the original spatial property of the decoded FBG signals, confirming the successful deployment of the hybrid codes. From the measurement of two FBG sensors located after 16 km of fiber, the combination of 31 bits of simplex-and 64 bits of Golay codes has resulted in a total of 10.5 dB improvement of SNR.
Fish production has significant impacts on the investment and operating costs of the modernization of fish ponds. Water quality monitoring system may help to overcome all the problems by using the implementation of the internet of things (IoT) technology. The project aims in detecting the presence of fishes using an ultrasonic sensor and investigating the parameters of pH and temperature sensors. The system is used pH and temperature sensor as the factors affecting the quality of water and fish growth, the ultrasonic sensor for detecting the presence of fishes, Blynk application through a smartphone for notifications, NodeMCU ESP8266 as its central controller and wireless fidelity (WI-FI) as the communication technology. A sample of three different measurement times in the early morning, midday, and evening based on temperature, pH levels and the fish distance show that this farm has high-quality water. From the measurement at the field test, temperature value increase in the midday, pH level remains constant in the three different times and the fish distance underwater always changes as a fish needs to find oxygen and a portion of food. As a result, a farmer need not hire workers at their site, consequently, drive down operating costs and improve efficiency.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.