SENSOR 2011, OPTO 2011 & IRS² 2011 (CD-ROM) Contents: Lectures and Posters of 7 until 9 June 2011 Plenary Talks SENSOR Conference Sessions: Impedance Spectroscopy; Surface Acoustic Wave Sensors; Flow Measurement Flow Sensors I, II; Ultrasonic Sensors I, II, III; Piezoresistive Sensors; Sensor Design and Modeling; Mechanical Sensors I, II; Sensor-Packaging; Dimensional Measurement; Actuators; Magnetic Sensors; Wireless Sensors I, II, III; Energy Harvesting; Sensor Electronic I, II; Miniature Audio Transducers; Bio-Chemo Sensors; High Temperature Sensors I, II; Gas Sensors I; II; Media Properties Sensors; Medical I, II, III OPTO Conference Sessions: Components for Sensing and Detection; 3D and Calibration; Measuring technologies; Applications poster contributions. IRS² Conference Sessions: Photon and Thermal Detectors; IR Arrays & lmaging; Gas Analysis; Infrared Spectroscopy poster contributions. CD-Rom enfolded: All full manuscripts of the SENSOR 2011, OPTO 2011, IRS² 2011 Conference and the short proceedings