Once you have the CH1 and CH2 points in excel, simply multiply them at each data point to get a power at the given point. 1V on CH2 will mean 1mA (current flowing trough 1k resistor between CH2 and GND, right?) Use I=U/R to convert CH2 measurements to current, i.e. Now you have a voltage signal on CH1, and a current signal on CH2. split the load resistor into two, i.e.measure the voltage across the pins of the piezo.If you have a 2 ch digital oscilloscope, do the followings: I'd suggest starting with 1k-2k loading resistor, which simulates a load. Alternatively you can feed your measurement to a buffer, and drive an averaging circuit.Įxample measurement setup to measure generated powerĪ good mechanically triggered piezo shall produce a voltage of 4V and over. This is a non-periodic signal, so you may wish to connect the measurement to an excel sheet where you can mmultiply voltage and current at each measurement point and calculate some average. Measure output of the piezo, and current in this circuit, multiply it and you get a (very little) wattage. You can measure how much power this produces by rectifying the output, and connect it to a resistor of known value. In order to get the most out of it, you have to have a mechanical input which is having the same frequency as the resonant frequency of the piezo (i.e. You can get out very little electric power from a piezo. If you want to use this as a power source, well, that is not a shiny way. a microcontroller) by using a series resistor of a few hundred ohms. For sensor usage, ensure that a high mechanical input will not produce a voltage which kills your processing device (e.g. you can put a 100 kOhm resistor across the piezo output, and you will see that the generated voltage is much lower. If you want to use this as a sensor, treat the piezo as a voltage source with a big series resistance.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |