Development of infrared absorption-based flow sensor for in-situ measurement of dispenser discharge amount

•An optical sensor was developed to in-situ measure the discharge amount of the dispenser in electronic packaging for the first time.•The infrared absorption characteristics of epoxy were analyzed.•For the flow velocity measurement, the movement of virtual thermal particles generated by infrared abs...

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Bibliographic Details
Published in:Optics and lasers in engineering 2023-02, Vol.161, p.107334, Article 107334
Main Authors: Lee, Seok Hwan, Kang, Woong, Im, Sunghyuk
Format: Article
Language:English
Subjects:
Discharge amount
Dispenser
Electronic packaging
Near-infrared absorption
Thermal mass flowmeter
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Summary:•An optical sensor was developed to in-situ measure the discharge amount of the dispenser in electronic packaging for the first time.•The infrared absorption characteristics of epoxy were analyzed.•For the flow velocity measurement, the movement of virtual thermal particles generated by infrared absorption was measured.•A method capable of measuring the dot flow rate at the time of discharging the dispenser has been developed.•The discharge value of the dispenser measured by the sensor was verified using a balance. During the electronic packaging process, blockage of a dispenser nozzle or epoxy hardening in the nozzle causes discharging problems. An infrared-absorption-based flow sensor that quantitatively measures the discharge from dispensers used for electronic packaging is developed to solve this problem. A local spot of the epoxy-supplying tube is heated using a laser to make a thermally tagged epoxy. Its velocity and discharge time are measured using light-emitting diode and photodetector pairs to measure quantitative discharge. On comparing the quantitative discharge obtained by the developed sensor and that determined by an electronic scale, a maximum deviation of 0.8% was observed, with a maximum uncertainty of 2.9%. Therefore, it is confirmed for the first time that the developed infrared absorption-based sensor can accurately measure the discharge amount of the dispenser in situ. In fact, the sensor can monitor the discharge amount during the dispensing process and be used as a feedback sensor for the precise control of the discharge amount.
ISSN:0143-8166
1873-0302
DOI:10.1016/j.optlaseng.2022.107334