Wiki

Analog Devices Wiki

English
English
简体中文
简体中文
日本語
日本語
Руccкий
Руccкий

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revisionPrevious revision
Next revision		Previous revision
Last revisionBoth sides next revision
university:courses:electronics:electronics-lab-eh [23 Mar 2017 15:27] – [Materials:] Doug Merceruniversity:courses:electronics:electronics-lab-eh [02 May 2017 12:27] – [Procedure:] replace plot Antoniu Miclaus
Line 11: Line 11:
 Energy harvesters provide only a very small amount of power for low-energy electronics. While the energy source for grid-scale generation plants costs money (oil, coal, gas etc.), the energy source for energy harvesters is present in the ambient background and is thus free. Energy harvesters provide only a very small amount of power for low-energy electronics. While the energy source for grid-scale generation plants costs money (oil, coal, gas etc.), the energy source for energy harvesters is present in the ambient background and is thus free.
  
-The piezoelectric transducer, LDT0 supplied in the Analog Parts Kit is a flexible film device laminated to a polymer substrate. Two crimped contacts for mounting and electrical connections are provided. When the device is bent or displaced from its neutral position, a very high strain is generated in the piezo-polymer and a high voltage is generated. As a vibration sensor the LDT0 has a sensitivity of 50 mV/g. An electrical model of a typical piezoelectric device is shown in figure 1.+The piezoelectric transducer, LDT0 supplied in the ADALP2000 Analog Parts Kit is a flexible film device laminated to a polymer substrate. Two crimped contacts for mounting and electrical connections are provided. When the device is bent or displaced from its neutral position, a very high strain is generated in the piezo-polymer and a high voltage is generated. As a vibration sensor the LDT0 has a sensitivity of 50 mV/g. An electrical model of a typical piezoelectric device is shown in figure 1.
  
 {{ :university:courses:electronics:aeh_f1.png?370 |}} {{ :university:courses:electronics:aeh_f1.png?370 |}}
Line 38: Line 38:
 ===== Procedure: ===== ===== Procedure: =====
  
-Connect the Analog Discovery hardware as indicated by the green boxes. Set both scope channels to 1V/div. With the horizontal time base set to 200mS/Div and trigger set to none, rapidly flick the transducer back and forth with your finger. Observe the voltage waveform across the transducer on channel 1 and the rectified and filtered DC voltage on channel 2. What you observe should look much like the screen shot shown in figure 3. The channel 1 waveform in orange shows the vibrating waveform produced by the transducer as it is flicked back and forth. The channel 2 waveform in blue shows the DC voltage charging up from zero volts to higher voltages each time the transducer vibrates.+Connect the ADALM2000 hardware as indicated by the green boxes. Set both scope channels to 1V/div. With the horizontal time base set to 200mS/Div and trigger set to none, rapidly flick the transducer back and forth with your finger. Observe the voltage waveform across the transducer on channel 1 and the rectified and filtered DC voltage on channel 2. What you observe should look much like the screen shot shown in figure 3. The channel 1 waveform in orange shows the vibrating waveform produced by the transducer as it is flicked back and forth. The channel 2 waveform in blue shows the DC voltage charging up from zero volts to higher voltages each time the transducer vibrates.
  
 The large but still finite 1 megaohm input resistance of the scope channel will load down the peak voltage generated by the transducer. Remove the connection to scope channel 1 and again rapidly flick the transducer. The DC voltage seen at the output should be significantly higher now. The large but still finite 1 megaohm input resistance of the scope channel will load down the peak voltage generated by the transducer. Remove the connection to scope channel 1 and again rapidly flick the transducer. The DC voltage seen at the output should be significantly higher now.
  
-{{ :university:courses:electronics:aeh_f4.png?550 |}}+{{:university:courses:electronics:ener_harv_plot.png|}}
  
 <WRAP centeralign> Figure 3 Scope Screen shot when flicking transducer rapidly </WRAP> <WRAP centeralign> Figure 3 Scope Screen shot when flicking transducer rapidly </WRAP>
university/courses/electronics/electronics-lab-eh.txt · Last modified: 03 Nov 2021 20:35 by Doug Mercer

Page Tools