As the picture below shows, the ultrasonic atomizer was fixed on glass slide G1 located on the base of the iron frame, and another glass slide G2 fixed by a three-claw clip C1 was used to collect the droplets, and above the glass slide G2, there was another three-claw clip C2 used to fix the rule, which was used for measuring the sampling height. After testing, it was proved that the suitable distance between the G1 (ultrasonic atomizer) and the G2 was 8cm (sampling height). The blue ink was used as the raw material to prepare samples for testing the feasibility of the sampling system.