An Optoelectronics-Based Compressive Force Sensor with Scalable Sensitivity

Area of Science:

• Optoelectronics
• Sensor Technology
• Materials Science

Background:

• Accurate compressive force measurement is critical for biomedical and industrial uses.
• Existing sensors often suffer from bulkiness, high power consumption, and electromagnetic interference.
• There is a need for improved force sensing solutions.

Purpose of the Study:

• To develop and validate an optoelectronics-based force sensor.
• To overcome the limitations of conventional force sensors.
• To provide a low-cost, low-power, and accurate force sensing method.

Main Methods:

• Utilized a light emitting diode (LED) to transmit light through an optically clear spacer and an elastomeric medium.
• Measured changes in light transmission to a photoresistor as a function of applied compressive force.
• Tested sensor performance with two sizes and four types of elastomers (neoprene and SBR).

Main Results:

• Achieved high accuracy with R-squared values greater than 0.97 across all tested configurations.
• Demonstrated low root-mean-square error (RMSE) below 1.9 N.
• Reported sensitivity values ranging from 17 to 485 N/V, indicating a wide force measurement range.

Conclusions:

• The developed optoelectronics-based sensor offers an accurate and reliable method for compressive force measurement.
• This sensing scheme presents a cost-effective and energy-efficient alternative to existing technologies.
• The sensor's performance across various configurations highlights its versatility for diverse applications.