Automatic Contact Angle Tester (Petrochemical)

JY-PHbContact angle tester

Key Features

Automatic contact angle analysis

Using machine vision technology, automatically identify baseline and droplet contours, and perform quadratic curve fitting calculation based on Laplace equation to obtain contact angle values. Reduced the influence of gravity on droplet shape and eliminated human testing errors. For images with obvious baseline features, fully automated testing can be achieved, while for images with unclear baseline features, manual baseline positioning is required.

Overview

JY-PHbContact angle testerUsed to measure the contact angle between solid, liquid, and gas phases. By measuring the contact angle, calculate and determine the surface physical and chemical properties such as the adhesion of liquids to solids and the surface energy of solids. This instrument is widely used in the research and manufacturing fields of petroleum, chemical, pharmaceutical, papermaking, dyes, and various new materials. Applying computer technology to transfer the ingested images into a computer for storage, analysis, and printing. Fast speed, accurate data, and easy operation. The equipment has automatic contact angle analysis function, high degree of automation, and high measurement accuracy.

test method

1. Static drip method.

Drop a droplet of liquid on the surface of a solid, take a photo of the equilibrium system after the solid liquid gas three-phase interface is balanced, and measure the contact angle using the contact angle measurement method provided by the software. It is also possible to take regular photos or videos of the balancing process during the testing process, and then analyze the changes in the system.

1. Addition and subtraction of droplets method.

Due to the unevenness of solid surfaces, it is sometimes necessary to measure dynamic contact angles to analyze the hysteresis phenomenon of contact angles. This instrument can measure the forward angle by continuously increasing the droplet volume or the backward angle by continuously decreasing the droplet volume.

1. Tilt plate method (JY-PHb type)

JH_PBbType * function, its stage can rotate electrically to form an inclination angle, and the droplet tilts to one side under the action of gravity until rolling occurs. This process can measure the forward and backward angles of the droplet.

hardware features

1Video capture: Using domestically produced industrial cameras,Image resolution 2048 * 1536 pixelsHigh precision, high definition, and low noise. USB 2.0 output, computer-controlled gain, brightness, and exposure time. USB power supply, no separate power source required. Signal to noise ratio>52dB, exposure time 17uS~2.3S.

2Lens characteristics:

Domestic zoom microscope lens.

Magnification ratio: 0.7-4.5X

Magnification factor: 30-130x

Shooting distance: 95mm

Tube length: 165mm

3Mobile characteristics of the loading platform:

Mobile mode: manual, smooth optical components

XDirection (horizontal): 80mm, accuracy 0.1mm

YDirection (vertical): 30mm, accuracy 0.1mm

ZDirection (up and down): 50mm

4Characteristics of the rotary table (JY-PHb type):

Using domestically produced high-precision optical rotary table to drive the concentric rotation of the stage, in order to achieve the forward and backward angle testing of the falling method

Rotation mode: computer-controlled, driven by a high-precision stepper motor, and can be manually adjusted.

Rotation angle: ≥ 90 °

Rotation speed: computer software adjustment

Angle scale resolution: 2 °

5Monochromatic semiconductor lighting source with continuously adjustable brightness.

6Frame rate: 25 frames per second

7Dimensions: 600x310x450 mm

Contact angle analysis method

• Automatic analysis method: For the vast majority of images, one click result analysis can be achieved using computer vision analysis technology and quadratic curve fitting to automatically measure and calculate the results. For a few images with unclear baseline features, provide a manual baseline method and perform automatic measurements. Display accuracy of 0.1 °. This method basically overcomes the influence of gravity on droplet shape, improves testing accuracy, and eliminates human errors.
• The tangent method is a measurement method that involves manually drawing baselines and arc tangents for measurement. It is suitable for images with severe asymmetry and can be manually analyzed with a display accuracy of 0.1 °.
• The high-dimensional measurement method involves drawing the bounding rectangle of a droplet and calculating the contact angle value using geometric methods. The display accuracy of the contact angle value is 0.1 °.
• The angle measurement method uses a protractor to measure the contact angle. The display accuracy of contact angle value is 0.1 °.
• Contact angle measurement range for all methods: 0-180 °

Video processing methods

• Preview in small window, take photos and analyze in large window. The main interface of the software has a video display window, which is used to display videos captured by the camera or video files played. Click on the thumbnail after taking the photo to enter the contact angle analysis interface, which is easy to operate.
• Video recording and image capture functions. The testing process can be recorded in real-time, and after recording the video, photos can be captured frame by frame through this software for easy capture of rapid dynamic changes.
• Single photo function. Capture and save the current image displayed in the video, and display it as a thumbnail in the main window.
• Continuous timed photography function, with adjustable timing. The photography interval time can be set, and automatic photography will be taken after reaching the interval time, making it easy to analyze the dynamic changes in contact angle.

Document and Image Management

• You can save a single image and select the analysis tool displayed on the image.
• It can save all test data and images as a whole.
• The test results are displayed in the form of a list and can be exported to an Excel file.
• The brightness, contrast, chromaticity, and backlight brightness of the camera image are adjusted by software settings.
• You can set the save path for videos and photos.
• Scaling and cropping functions for photo results.

Surface energy calculation

• Surface energy calculation function, providing calculation methods for Fowkes equation, Owens equation, and YGGF equation.

runtime environment

• Use 64 bit Windows operating system.
• The recommended memory is 4GB or more, and the hard disk space should not be less than 10G.