Nano Sensors (cantilever) Nano-Micro Doctoral Nano Force Sensors
Author and researcher Engineer Afshin Rashid
Note: Cantilever nano-sensors are the most common power sensor. The probe is mounted at the end of the beam and the find of force is based on the location of the reflection of the landing laser behind the beam.
In cantilever nanosensors, the force between the sample and the probe tip causes the beam to bend. The amount of bending is displayed and recorded by position-sensitive detectors located in four quadrants. Optical detectors receive a laser beam hitting the back of a beam and breaking through it. The back of the pillar is often covered with a thin layer of metal that makes it a mirror. Each small beam deformation tilts the laser beam and changes the position of its impact on the optical detectors. The difference between the signals of the two optical detectors indicates the amount of beam failure. The fracture value, according to the elastic properties of the beam, is then converted to the force on the probe tip by mathematical equations.
The distance between the beam and the optical detectors is about three times the length of the beam. Such optical arrangement can well magnify the motion of the probe tip and provide very high sensitivity . Other methods, such as interference and piezoelectricity, have been used to find beam failure. But optical diode makeup is more common because it's cheaper, easier to work with, and acceptable.
Accurate measurement of nanoscale parameters, such as physical changes or the presence of chemical species, and force measurement requires the use of nanoscale cantliever sensors. Cantliever force nanosensors use nanoscale sensor elements that have a high sensitivity for this type of nanomaterial. Materials made of nanosensors should also have high durability and good electrical properties. In general, the important features of nanosensors are higher selectivity, higher sensitivity, smaller dimensions and cheaper price. Cantliever power nanosensors are inherently smaller and more sensitive than other sensors and have most industrial and military applications.