接近传感器和位移传感器属于整个传感器行业中最为成熟的品种。通常情况市场扩展也较平缓。然而,近年来,主要受到4种技术(光电、超声、激光线性位移、超声线性位移)的推动,接近/位移传感器市场扩展相当迅速。据美国风险开发公司最近发表的一份市场调研报告,1999—2004年,美国的接近和位移传感器市场规模预计将从9.10亿美元增长到12.5亿美元(复合年增长率6.6%);而 Proximity sensors and displacement sensors are among the most mature varieties in the entire sensor industry. In general, the market expansion is also relatively flat. However, in recent years, the proximity/displacement sensor market has been expanding rapidly, mainly driven by four technologies (photoelectric, ultrasonic, laser linear displacement, and ultrasonic linear displacement). According to a recent market research report released by the U.S. Venture Development Corporation, the market size of the U.S. proximity and displacement sensors is expected to increase from US$910 million to US$1.25 billion (a compound annual growth rate of 6.6%) from 1999 to 2004;