To combine modern sensor technology with digital image processing, a real-time measurement system of lens centering
errors is designed based on CCD sensor. Following transmission principle as well as reflection principle, a scheme that
applies two orthogonal light sources to the measurement system is put forward with the combination of cross and double
slit reticles. The experimental result shows that the standard deviation of centering errors is up to 0.0019mm, the limit
errors is ±0.0057mm. It is proved that the measurement system is of good reliability and practicability for measurement
of centering errors. In addition, the designed system is suitable for multi-parameter measurement, including focal length,
intercept and curvature radius, etc.
A project of embedded Wireless Distributed Sensor/Control Network (WDSCN) based on RF is presented after
analyzing the disadvantages of traditional measure and control system. Because of high-cost and complexity, such
wireless techniques as Bluetooth and WiFi can't meet the needs of WDSCN. The two-layer WDSCN is designed based
on RF technique, which operates in the ISM free frequency channel with low power and high transmission speed. Also
the network is low cost, portable and moveable, integrated with the technologies of computer network, sensor,
microprocessor and wireless communications. The two-layer network topology is selected in the system; a simple but
efficient self-organization net protocol is designed to fit the periodic data collection, event-driven and store-and-forward.
Furthermore, adaptive frequency hopping technique is adopted for anti-jamming apparently. The problems about power
reduction and synchronization of data in wireless system are solved efficiently. Based on the discussion above, a
measure and control network is set up to control such typical instruments and sensors as temperature sensor and signal
converter, collect data, and monitor environmental parameters around. This system works well in different rooms.
Experiment results show that the system provides an efficient solution to WDSCN through wireless links, with high
efficiency, low power, high stability, flexibility and wide working range.
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