The fully automatic contact angle measuring instrument integrates image processing algorithms and precision optical systems, which can automatically complete the entire process of droplet placement, image acquisition, and processing, thereby reducing the need for manual operation and improving measurement efficiency and accuracy. The instrument has a wide testing range and can measure the contact angle of various liquids with various materials. It supports multiple contact angle analysis methods such as θ/2 method and automatic analysis method, with a testing resolution of up to 0.01 °.

The fully automatic contact angle measuring instrument may still encounter some problems in practical use. Understanding these problems and their corresponding solutions is crucial to ensure the accuracy of measurement results and the normal operation of the equipment.

1. Inaccurate measurement of contact angle

Phenomenon: There is a significant difference between the measured contact angle value and the expected or literature reported value.

Root cause analysis:

(1) Inaccurate droplet distribution;

(2) Surface contamination or improper treatment of the sample;

(3) Environmental factors such as temperature and humidity changes affect droplet behavior.

Solution:

(1) Use high-precision syringes or automatic sampling systems, and calibrate them regularly to ensure consistency in the amount added each time;

(2) Clean the surface of the sample, remove possible contaminants, and reprocess the sample if necessary;

(3) Conduct experiments in a constant temperature and humidity environment to reduce the influence of external factors on the experiment.

2. Poor image quality

Phenomenon: The captured droplet images are blurry and difficult to identify the edges.

Root cause analysis:

(1) Inappropriate lighting conditions;

(2) The lens is dirty or not focused correctly;

(3) Improper camera settings.

Solution:

(1) Adjust the angle and intensity of the light source to ensure uniform and sufficient backlighting;

(2) Regularly clean the lens and check if it is correctly installed and focused;

(3) Adjust camera parameters according to specific needs, such as exposure time, gain, etc., to optimize image quality.

3. Automatic analysis failed

Phenomenon: The software is unable to automatically recognize droplet contours or calculate incorrect results.

Root cause analysis:

(1) Insufficient image contrast;

(2) Abnormal droplet shape (such as asymmetric or non spherical);

(3) The software algorithm is not suitable for the current sample type.

Solution:

(1) Improve lighting conditions or replace with more suitable background materials to enhance image contrast;

(2) For droplets with special shapes, try manually adjusting parameters or using other analytical methods;

(3) Update software versions or choose professional analysis plugins that are more suitable for application scenarios.

4. Frequent malfunctions

Phenomenon: The instrument frequently experiences hardware or software malfunctions, affecting normal use.

Root cause analysis:

(1) Wear and aging of internal mechanical components;

(2) There are vulnerabilities in the control system software;

(3) Improper operation leads to equipment damage.

Solution:

(1) Regular maintenance and timely replacement of worn parts;

(2) Pay attention to the new patches and updates released by the manufacturer, and keep the software up-to-date;

(3) Operators should receive professional training and strictly follow the instructions to operate the equipment.

The fully automatic contact angle measuring instrument can effectively improve the efficiency and measurement accuracy by solving these common problems and taking corresponding measures, ensuring the smooth progress of scientific research and experimental work.