tailieunhanh - Overview of Fiber Optic Sensors phần 4

Tham khảo tài liệu 'overview of fiber optic sensors phần 4', kỹ thuật - công nghệ, kĩ thuật viễn thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Environmental Effect Figure 48. Fiber optic smart structure systems consist of optical fiber sensors embedded or attached to parts sensing environmental effects that are multiplexed and directed down. The effects are then sent through an optical fiber to an optical electronic signal processor that in turn feeds the information to a control system that may or may not act on the information via a fiber link to an actuator. Fiber optic sensors can be embedded in a panel and multiplexed to minimize the number of leads. The signals from the panel are fed back to an optical electronic processor for decoding. The information is formatted and transmitted to a control system which could be augmenting performance or assessing health. The control system would then act via a fiber optic link to modify the structure in response to the environmental effect. Figure 49 shows how the system might be used in manufacturing. Here fiber sensors are attached to a part to be processed in an autoclave. Sensors could be used to monitor internal temperature strain and degree of cure. These measurements could be used to control the autoclaving process improving yield and the quality of the parts. Composite Temperature Part Autoclave Sensor Demodulator Figure 49. Smart manufacturing systems offer the prospect of monitoring key parameters of parts as they are being made which increases yield and lowers overall costs. Interesting areas for health and damage assessment systems are on large structures such as buildings bridges dams aircraft and spacecraft. In order to support these types of structures it will be necessary to have very large numbers of sensors that are rapidly reconfigurable and redundant. It will also be absolutely necessary to demonstrate the value and cost effectiveness of these systems to the end users. One approach to this problem is to use fiber sensors that have the potential to be manufactured cheaply in very large quantities while offering superior performance .