[Abstract] To address the problem of large-scale bridge vibration data acquisition in the field of bridge health monitoring, a networked vibration sensor based on the TCP/IP protocol was designed and developed. Its hardware composition and software structure are introduced. This novel vibration sensor achieves localized digitization and network transmission of simulated bridge vibration signals, integrating the monitoring and control network with the information network. This implementation scheme can also be used in various fields with large-scale networked monitoring and control needs. [Keywords] Networked vibration sensor, TCP/IP protocol, bridge health monitoring 1. Introduction With the widespread application of network technology, Ethernet based on the TCP/IP protocol has developed rapidly and gained global support. Currently, Ethernet technology is widely used not only in office automation but also in the management and monitoring networks of various enterprises, and is beginning to extend to the field device layer network. In fields with large-scale data acquisition requirements, such as bridge vibration status monitoring, the internationally accepted practice is to use traditional analog sensors distributed installations, with multiple analog output signals concentrated at a single point via transmission lines, and then uniformly sent to a computer for digitization. The disadvantages of this scheme are that analog signals are prone to distortion over long distances and have poor anti-interference capabilities. The networked vibration sensor introduced in this paper solves this problem, realizing digital communication at the sensor's field level. The basic idea of ​​this research is to combine ordinary vibration sensors with computer network technology to study and develop a networked vibration sensor based on the TCP/IP protocol. This enables sensors distributed in the field to locally digitize and transmit simulated signals of the bridge's healthy vibration state over a network. The role of the networked vibration sensor in the entire system is shown in Figure 1. Figure 1. Structure of a Bridge Health Monitoring System Based on a Networked Vibration Sensor 2. Hardware Structure of the Networked Vibration Sensor The key components of the networked vibration sensor described in this paper consist of an 891-4 displacement sensor and a Rabbit 3000. The 891-4 is a precision sensor designed by the Oriental Vibration and Noise Technology Research Institute specifically for monitoring vertical and lateral vibration displacement of bridges. The Rabbit 3000 is a new generation 8-bit high-performance microprocessor for embedded systems launched by Z-World Corporation in the United States. Its program memory is embedded with currently popular Internet protocol stacks, such as HTTP, SMTP, POP3, TCP, UDP, ICMP, and IP. Thus, after integrating a 10/100Base-T Ethernet interface at the output of the Rabbit 3000, the networked vibration sensor can perform Internet protocol processing while acquiring data or completing I/O control tasks, enabling real-time information publishing and sharing with the host computer. The AD574A selected in this paper is a fast 12-bit A/D converter from Analog Devices, Inc. The structure of the networked vibration sensor is shown in Figure 2. Each networked vibration sensor has its own IP address and port number. Multiple networked vibration sensors can be installed in the entire monitoring system and connected by a switch to form an Ethernet network. Figure 2: Structure of the networked vibration sensor based on Rabbit3000. 3. Software System Design of the Networked Vibration Sensor The software system of the networked vibration sensor is created using Dynamic C. Dynamic C, based on the C language, is a software development tool provided by Z-World for Rabbit series microprocessors. It is suitable for writing embedded software and is an extended C programming system. This software development environment integrates editing, compiling, linking, debugging, and downloading, and has online programming and debugging capabilities. Software development can be achieved simply by connecting the PC serial port and the Rabbit3000-based networked vibration sensor with a single interface cable. The software system comprises two main functions: signal acquisition and network transmission. The main program flowchart is as follows: The source code for part of the system initialization is given below: 4. Bridge Health Status Detection Results The development platform for the host computer monitoring software running on the bridgehead server is NI's LabVIEW 7.0. This software has a user-friendly interface, can store all acquired data in a database, and can display and analyze waveforms. The measurement result curve is given below using the lateral vibration displacement signal as an example: Figure 4 Lateral Displacement Curve 5. Conclusion The networked vibration sensor based on the Rabbit 3000 microprocessor introduced in this paper is the result of combining sensor technology with network communication technology. It realizes the complete digitization and networking of the bridge health status monitoring system, integrating the measurement and control network with the information network. Moreover, it is "plug and play," making system expansion and maintenance very convenient. Besides large structures such as bridges, networked instruments can also replace traditional sensors and be widely used in fields with large-scale networked measurement and control needs, such as national defense, communications, aviation, aerospace, meteorology, and manufacturing.