read the internet. there are lot of comapnies. A simple google search and the first link. http://www.irconnect.com/noc/press/pages/news_releases.html?d=38917 and this is (2003) http://infoart.iip.net/tech/news/src/30000001.htm http://www.taecorp.com/ http://www.vallon.de/products.lasso?a=multi-sensor http://www.contrastoptical.com/Services/OpticalDesign/ImagingSystems/MultiSpectralImagers/tabid/75/Default.aspx