There is a book by Julian W. Gardner, "Microsensors Principles and Applications" Published by John Wiley & Sons Ltd 1994. It is a very good book, if you want an introduction to sensors and microsensors. The book has information of the various types of microsensors and applications. Hector Soto SOTO, HECTOR L H.L.SOTO@LaRC.NASA.GOV Mail Stop 493 Measurement Science & Technology Branch 18 Langley Boulevard Fluid Mechanics and Acoustics Division NASA Langley Research Center Building 1200, Room 208 Hampton, VA 23681-0001 Phone +1 804 864-4583 Fax +1 804 864-8315