Flexible Quartz Accelerometer Light Weight, Low Power Consumption
The Flexible quartz accelerometer can help your robot understand the environment in which it is now.
Is it climbing? Still down the slope, did not fall? Or for the flight of the robot, the control of the attitude is also essential. But also to ensure that your robot did not bring their own bomb to the crowd crowded. A good programmer can use the Flexible quartz accelerometer to answer all of the above questions. The Flexible quartz accelerometer can even be used to analyze the vibration of the engine.
By measuring the acceleration due to gravity, you can calculate the tilt angle of the device relative to the horizontal plane. By analyzing the dynamic acceleration, you can analyze the way the device moves. But at the beginning, you will find that light measurement of tilt and acceleration seems not very useful. But now engineers have come up with a lot of ways to get more useful information.
Some notebook computers built on the Flexible quartz accelerometer, can dynamically monitor the use of the notebook in the vibration, and according to these vibration data, the system will choose the smart switch or let it continue to run, so that the maximum degree of protection due to vibration, Such as bumpy working environment, or accidentally dropped the computer to do the hard disk damage caused by the greatest degree of protection inside the data. Another use is the current use of digital cameras and cameras, there are Flexible quartz accelerometers, used to detect the vibration of the hand when shooting, and according to these vibrations, automatically adjust the camera's focus.
The Flexible quartz accelerometer can be used in the control, vibration and shaking of the handle, instrumentation, automobile brake start detection, earthquake detection, alarm system, toy, structure, environmental monitoring, engineering vibration, geological exploration, railway, bridge, dam vibration Testing and analysis; mouse, high-rise building structure dynamic characteristics and safety and security vibration reconnaissance.
Flexible quartz accelerometer works
The principle of the line accelerometer is the principle of inertia, that is, the balance of force, A (acceleration) = F (inertial force) / M (mass) we only need to measure F on it. How to measure F? With electromagnetic force to balance this force on it. It is possible to obtain the relation F corresponding to the current. Only need to use the experiment to calibrate the scale factor on the line. Of course, the middle of the signal transmission, amplification, filtering is the circuit thing.
Modern technology requires Flexible quartz accelerometers inexpensive, superior performance, easy to mass production. In areas such as military, space systems, scientific measurement, the need for the use of small size, light weight, stable performance of the Flexible quartz accelerometer. Flexible quartz accelerometers made by conventional machining methods are difficult to fully meet these requirements. So the application of new micro-machining technology produced micro-Flexible quartz accelerometer came into being. This sensor is small, light weight, low power consumption, fast start, low cost, high reliability, easy to achieve digital and intelligent. Moreover, because the micro-mechanical structure of the production of accurate, good repeatability, easy integration, suitable for mass production, its performance and high cost. It is foreseeable that in the near future it will dominate the Flexible quartz accelerometer market.
The structure of the piezoelectric accelerator sensor is shown in the figure. A sheet of metal foil is sandwiched between two silver-plated piezoelectric chips (quartz crystal or piezoelectric ceramic) and leads to the leads of the output signal. A mass is placed on the piezoelectric wafer and a preloaded load is applied to the piezoelectric element with a hard spring. The static preload size should be much larger than the maximum dynamic stress that the sensor may withstand during vibration and shock testing. In this way, when the sensor moves upward, the inertia force generated by the mass increases the compressive stress on the piezoelectric element; conversely, when the sensor moves downward, the compressive stress of the piezoelectric element is reduced, thereby outputting a voltage proportional to the acceleration signal.
The entire assembly of the sensor is mounted on a base and sealed with a metal housing. In order to isolate any strain of the specimen to the piezoelectric element, the base size is large. The base of the sensor is rigidly connected to the test piece during testing. When the vibration frequency of the test piece is much lower than the resonant frequency of the sensor, the output charge (or voltage) of the sensor is proportional to the acceleration of the test piece, and the acceleration can be measured by the charge amplifier or the voltage amplifier.