The current status and prospects for in-process optical sensors are examined in an international context. The global market for simple beam-interrupt sensors is contrasted with that developing for more complex analogue sensors. These are being encouraged internationally by both cooperative R&D groups and trade associations; examples in the UK and Japan are described. Japanese trade statistics and a survey of available product world-wide are outlined, allowing technology and product trends to be discerned.
"Current Status And Prospects For In-Process Optical Sensors", Proc. SPIE 1012, In-Process Optical Measurements, (10 March 1989); doi: 10.1117/12.949328; https://doi.org/10.1117/12.949328