Road surface condition sensor based on scanning detection of backward power

A method of detecting dry, icy and wet road surface conditions based on scanniag detection of single wavelength backward power is proposed in this letter. The detector is used to receive the backward scattered power which changes with the incidence angle. The relationship between backward power and incidence angle is used to find out the effective angle range and distinguish method. Experiment and simulation show that it is feasible to classifv these three conditions within incidence angle of 5.3 degree.

IoT Honeypot Scanning and Detection System Based on Authorization Mechanism

In this paper,an Internet of Things(IoT)honeypot scanning and detection system is proposed based on an authorization mechanism.For the functional characteristics of different devices existing in the IoT environment,an authorization and authentication system was designed based on device MAC and randomly generated key for requesting permissions from devices with asset management and traffic monitoring.Subsequently,an authorized access network model was constructed between devices and the authorization system,which inveigles the scanning requests from unauthorized devices into the IoT honeypot based on the authorized authentication algorithm.Specifically,an IoT honeypot system was built and a data collection module,a data preprocessing module,and a scan detection module were installed in it to perform detection and output feedback on the traffic redirected to the honeypot.The experimental results show that our designed system can efficiently identify whether the device is authorized or not in the IoT system and successfully detect the illegal scanning requests from non-authorized devices.

Design and Experiment of PZT Network-based Structural Health Monitoring Scanning System

The active Lamb wave and piezoelectric transducer （PZT）-based structural health monitoring （SHM） technology is a kind of efficient approach to estimate the health state of aircraft structure. In practical applications, PZT networks are needed to monitor large scale structures. Scanning many of the different PZT actuator-sensor channels within these PZT networks to achieve on-line SHM task is important. Based on a peripheral component interconnect extensions for instrumentation （PXI） platform, an active Lamb wave and PZT network-based integrated multi-channel scanning system （PXI-ISS） is developed for the purpose of practical applications of SHM, which is compact and portable, and can scan large numbers of actuator-sensor channels and perform damage assessing automatically. A PXI-based 4 channels gain-programmable charge amplifier, an external scanning module with 276 actuator-sensor channels and integrated SHM software are proposed and discussed in detail. The experimental research on a carbon fiber composite wing box of an unmanned aerial vehicle （UAV） for verifying the functions of the PXI-ISS is mainly discussed, including the design of PZTs layer, the method of excitation frequency selection, functional test of damage imaging, stability test of the PXI-ISS, and the loading effect on signals. The experimental results have verified the stability and damage functions of this system.

A sensitive charge scanning probe based on silicon single electron transistor

Single electron transistors（SETs） are known to be extremely sensitive electrometers owing to their high charge sensitivity. In this work, we report the design, fabrication, and characterization of a silicon-on-insulatorbased SET scanning probe. The fabricated SET is located about 10 m away from the probe tip. The SET with a quantum dot of about 70 nm in diameter exhibits an obvious Coulomb blockade effect measured at 4.1 K. The Coulomb blockade energy is about 18 me V, and the charge sensitivity is in the order of 10^-（5）–10（^-3）e/Hz^（1/2）. This SET scanning probe can be used to map charge distribution and sense dynamic charge fluctuation in nanodevices or circuits under test, realizing high sensitivity and high spatial resolution charge detection.