A Novel 3D-Printed Accelerometer Using Window-Light Displacement Measurement

3D printing technology has enabled the development of low-cost, highly customizable sensors by providing rapid fabrication and flexible design capabilities. This study introduces a rapid design and fabrication workflow for accelerometers, utilizing a one-step 3D printing process combined with an optical window-light method for displacement detection. The accelerometer is fabricated using Polyethylene Terephthalate Glycol (PETG) filament, with the proof mass and springs printed as part of the process. The optical window-light intensity measurement method is employed to detect micrometer-scale displacements, facilitating the detection of variable acceleration. This approach offers significant benefits, including simple design, elimination of additional metallization or assembly steps, and avoidance of complex integrated measurement circuitry. The proposed 3D-printed accelerometer demonstrates a resolution of 10 mg and operates over a wide measurement range of -2 to 2 g with linearity and strong dynamic response. This workflow provides an efficient solution for customized MEMS device production and showcases the potential of the optical window-light method for low-cost accelerometer development.