PPS触觉传感器原理.docx

Capacitive Tactile Sensing CapacitanceThe basic electrical property of capacitance a measure of an objects ability to store electrical charge has been demonstrated in countless physics classes with the classic example of two electrodes with area A separated by an air gap d as shown. If the air gap decreases, the capacitance C goes up.Tactile SensorsPressure Profile Systems uses this property to build its tactile pads and arrays by separating the electrodes using a proprietary compressible dielectric matrix, which acts like a spring. Precision manufacturing techniques allow excellent repeatability and sensitivity, while advanced conductive materials allow for conformable, stretchable, industrial, and other hybrid sensor designs. The simplicity of the capacitive sensor design gives PPS a large degree of flexibility when creating custom sensor solutions.Array SensorsTo build tactile array sensors, PPS arranges the electrodes as orthogonal, overlapping strips. A distinct capacitor is formed at each point where the electrodes overlap. By selectively scanning a single row and column, the capacitance at that location, and thus the local pressure, is measured. PPSs proprietary drive and conditioning electronics can scan through an array at high speed while optimizing settings to achieve the maximum sensor response from each sensing element.Sensor Technology ComparisonUnlike with some other tactile sensor designs, capacitive-based sensors do not have significant internal wear and tear under load. Since the scale of the deflections is so small, there is little chance for “set” in the material, thus reducing the frequency with which capacitive sensors must be calibrated. The following table shows a comparison of capacitive sensors versus the two other most common approaches, resistive and piezoelectric tactile sensors.Chameleon TVR Software Chameleon TVR (Tactile Visualization & Recording) Software is PPSs new universal application for real-time visualization, acquisition, and playback of all PPS sensors.Chameleon TVR software allows you to visually view real-time tactile pressure data as well as record and export specific segments for more complex analysis.Chameleon TVRs versatile design automatically-reconfigures to support the proper options and features unique to different PPS systems, including selectable sub-regions for analysis and export, synchronized video, calibration, selectable units, and many other features.If your needs are more specific, we have multiple options for custom development for Windows applications using C#, C+, or VisualBasic. Feature-rich applications can be developed against the full Chameleon SDK, or simpler applications can be developed or integrated using our standard API providing access to sensor data directly from any of PPSs hardware systems. Alternatively, PPS can provide custom software solutions, including laser scanning of your parts to provide a 3D display of the applied pressure so that pressures can be shown on the actual shape to which the sensors are bonded, as well as auxiliary IO integration for synchronized DAQ or real-time thermal State-of-the-Art Foot Scanning PPS & eSoles partnered KioskPPS has partnered with eSoles, a supplier of high-performance, custom insoles, to design and produce the worlds most advanced 3D foot scanning kiosk. A new modular insole system, provides leading performance at a lower cost than going to a foot specialist. The challenge was to find a simple and inexpensive way for the customer to determine the appropriate eSoles components from the over 1,500 possible combinations. To do this, they turned to PPS.The first step was to accurately capture the foots shape and size. PPS developed a large, high-speed tactile mat to capture foot pressure information, and combined this with a custom, 3D white light scanner to capture foot geometry. Advanced processing algorithms were created to examine this data, determine key anatomical features, and