A photoelectric cantilever-based current sensing methodology, mainly composed of a cantilever, a magnet, an analyzer, and a photodiode, for passive measuring diverse multiline cables with diverse currents, is proposed for the desirable application of a Wireless Sensor Node (WSN) in Internet of Things (IoT). The basic idea is to achieve a synchronous vibration of both the analyzer and the cantilever to modulate the natural light signal incident on the photodiode. In this Letter, the magnet, fixed at the end of the cantilever, is used to passively convert the applied current induced magnetic force into a cantilever vibration, which is further converted to a polarization angle variation via the above synchronous vibration. The natural light signal is accordingly modulated and a varied voltage, as a function of the applied current, is thus output from the photodiode. A two-wire DC electric current is used to verify the validity of the sensing mechanism. The measurement error can be decreased to less than half of the theoretical one by calibration, and the linear range can be further adjusted by changing a value on the host computer. Compared to the piezoelectric cantilever-based one, the proposed photoelectric cantilever-based methodology can achieve a continuous measurement of DC and its variation with a higher resolution, and both a faster response and a higher resolution for AC, and thus is more suitable for IoT applications.A photoelectric cantilever-based current sensing methodology, mainly composed of a cantilever, a magnet, an analyzer, and a photodiode, for passive measuring diverse multiline cables with diverse currents, is proposed for the desirable application of a Wireless Sensor Node (WSN) in Internet of Things (IoT). The basic idea is to achieve a synchronous vibration of both the analyzer and the cantilever to modulate the natural light signal incident on the photodiode. In this Letter, the magnet, fixed at the end of the cantilever, is used to passively convert the applied current induced magnetic force into a cantilever vibration, which is further converted to a polarization angle variation via the above synchronous vibration. The natural light signal is accordingly modulated and a varied voltage, as a function of the applied current, is thus output from the photodiode. A two-wire DC electric current is used to verify the validity of the sensing mechanism. The measurement error can be decreased to less than half...
[1]
Gangbing Song,et al.
An experimental study of ultra-low power wireless sensor-based autonomous energy harvesting system
,
2017
.
[2]
Dong F. Wang,et al.
A temperature compensation methodology for piezoelectric based sensor devices
,
2017
.
[3]
Dong F. Wang,et al.
Position and orientation correction scheme for current sensing based on magnetic piezoelectric cantilevers
,
2017
.
[4]
Latifah Munirah Kamarudin,et al.
Enabling IoT: Integration of wireless sensor network for healthcare application using Waspmote
,
2017
.
[5]
Dong F. Wang,et al.
Developing passive MEMS DC/AC current sensor applicable to two-wire appliances with high measurement accuracy
,
2016
.
[6]
Yang Li,et al.
A passive DC current sensing methodology
,
2016
.
[7]
Kyoo Nam Choi,et al.
Optical arc sensor using energy harvesting power source
,
2016
.
[8]
Dong F. Wang,et al.
Developing integrated piezoelectric direct current sensor with actuating and sensing elements
,
2013
.
[9]
Dong F. Wang,et al.
Integrated piezoelectric direct current sensor with actuating and sensing elements applicable to two-wire dc appliances
,
2013,
Measurement Science and Technology.
[10]
Takeshi Kobayashi,et al.
Passive piezoelectric single-side MEMS DC current sensor with five parallel PZT plates applicable to two-wire DC electric appliances without using cord separator
,
2013
.
[11]
Takeshi Kobayashi,et al.
Passive piezoelectric DC sensor applicable to one-wire or two-wire DC electric appliances for end-use monitoring of DC power supply
,
2012
.
[12]
Dong F. Wang,et al.
Developing passive piezoelectric MEMS sensor applicable to two-wire DC appliances with current switching
,
2012
.
[13]
Panos G. Datskos,et al.
Non-contact current measurement with cobalt-coated microcantilevers
,
2004
.
[14]
R. Cowburn,et al.
High sensitivity measurement of magnetic fields using microcantilevers
,
1997
.
[15]
R. B. Givens,et al.
A microelectromechanical‐based magnetostrictive magnetometer
,
1996
.
[16]
C. Rossel,et al.
Active microlevers as miniature torque magnetometers
,
1996
.