What are the instruments used to measure the thickness of a film?

In terms of ellipsometers that require high measurement accuracy and powerful functions. It is recommended to have a Muller matrix ellipsometer with a dual-extinction rotary compensator design, which is the most cutting-edge in the elliptic deviation industry. 16 parameters can be measured in seconds with a single parameter setting, which is especially suitable for the measurement of anisotropic materials.

It seems that only Wuhan Yiguang Technology's Muller matrix ellipse ME-L and a foreign company have the ability to process Muller's data.

The Delta Film Thickness Measurement System uses the principle of thin film interferometric optics to measure and analyze the thickness of thin films. The surface of the film is illuminated with a wide spectrum of light sources that can be selected from deep ultraviolet to near-infrared, and the reflected light is received in the same position as the probe. Based on the reflected interference light, Delta quickly calculates the thickness of the film by using a repeatable calibration algorithm.

The measurement range is 1nm-3mm, and multi-layer film thickness can be tested at the same time. For films above 100 nm, n and k values can also be measured.

The packaging film mainly plays a role in product protection, and some businesses often wrap the previous film on the product in order to facilitate transportation. In order to ensure the reliability of transportation packaging, Shenzhen Dacheng Precision Equipment has developed and produced a wave side collapse measuring instrument for packaging film materials.

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There are coating thickness gauges, film thickness gauges and other instruments, commonly used principles such as ultrasonic, X-ray and other principles, to choose according to the material and film thickness you measure, at present, there are many domestic and imported manufacturers.

Such as Times, Oxford, EPK, etc., you can search for them on the Internet.

You can use NVL300-MCT glass multi-coating ink thickness measuring instrument, this instrument is the latest measuring instrument launched by Zhitai Group for film thickness quality control, which can carry out high-efficiency, non-contact measurement, you can go to their Chinese instrument supermarket** to learn about it.

At present, there are three commonly used thickness gauges: laser thickness gauges, radiographic thickness gauges, and ultrasonic thickness gauges. A laser thickness gauge consists of two opposing laser distance sensors.

When working, the upper and lower sensors measure the distance between the sensor and the upper and lower surfaces of the measured object respectively, and the total distance between the two sensors can be subtracted from the distance measured by the two sensors to obtain the thickness of the measured object. The advantage of laser thickness gauges is that they are non-contact and do not lose accuracy due to wear, making them particularly suitable for measuring moving objects. It is also more accurate than ultrasonic thickness gauges and has no radiation contamination compared to X-ray thickness gauges.

X-ray thickness gauges use an X-ray source. Some of the X-rays entering the ionization chamber have a photoelectric effect and scatter with the walls of the ionization chamber and the gases filled in the ionization chamber. The secondary electrons cause the gas in the ionization chamber to produce positive and negative ions.

Under the action of the electrode voltage in the ionization chamber, it flows to the negative and positive electrodes, respectively. The anode and cathode collect currents in the order of 10-9A and 10-8A. It is converted into a voltage signal by an electrometer.

The task of the electronic circuit and the computer is to calculate the thickness value t based on the relationship between the output voltage u(t) of the electrometer in the probe and the thickness value t. Ultrasonic thickness gauges use the latest high-performance, low-power microprocessor technology. Based on the ultrasonic measurement principle, it is possible to measure the thickness of materials such as metals, as well as the sound velocity of materials.

Different occasions also use different thickness gauges, and it cannot be generalized. Typically, laser thickness gauges can be used for total thickness measurements, while X-ray thickness gauges and ultrasonic thickness gauges can be used to measure coating thickness. The appropriate thickness gauge should be selected according to the detection requirements of biotic production.

Paper thickness gauge: It is suitable for measuring the thickness of various films, paper, cardboard and other sheet materials below 4mm.

Thin film thickness gauge: used to determine the thickness of thin films, thin sheets and other materials, with a wide measurement range and high measurement accuracy.

Coating Thickness Gauge: Used to measure the thickness of the coating on ferrous and non-ferrous metal substrates.

Laser thickness gauge: It is a non-contact dynamic measuring instrument that uses the principle of laser reflection to measure and observe the microscopic geometry of the processing surface of parts in machinery manufacturing according to the light-cut dust shielding method.

X-ray thickness gauge: mainly used in non-ferrous metal strip and foil processing, metallurgical industry strip processing.

Ultrasonic thickness gauge: Ultrasonic thickness gauge is based on the principle of ultrasonic pulse reflection to measure thickness.

1. Scientific averaging method: count 20 or 50 or even 100 sheets to check the dust, and then measure the thickness with a ruler, and then divide by the number of papers to determine the average thickness;

2. Scientific instrument method: use higher precision measuring instruments: vernier calipers, micrometers, etc.

With calipers, the film is stacked in ten layers and then divided by ten. That's how I measured it back then.

Pro: You can use an outer micrometer to measure the thickness of the film!

The detection of coating thickness will be conducive to effectively controlling the thickness uniformity of each layer of the film, but for multi-layer films, if you want to accurately measure the thickness of each coating, you need to have a very large investment in the corresponding thickness detection equipment, and increase with the growth of the number of film layers, which brings a greater economic burden to the enterprise. The more economical way is to detect the coating thickness of some of the most expensive coating materials, and at the same time strengthen the test of the overall thickness of the film to effectively control the uniformity of the thickness of other layers of materials.

For film thickness measurement, Shenzhen Dacheng Precision has been continuously increasing R&D investment and constantly committed to technological innovation. Dacheng Precision Optical Interferometer Thickness Gauge is specially developed for transparent films, which can achieve good thickness measurement of single or multiple layers of transparent films. It is extremely accurate and can be used in a wide range of applications, especially for the thickness measurement of transparent multi-layered objects with a thickness of up to the nanometer level.

The common spiral micrometer in life, also known as a micrometer, can measure millimeters, which can meet the needs of measuring the thickness of plastic films, and is cheap. Ten films can be stacked and measured together, and the thickness can be measured divided by ten for more accurate results.

According to the requirements in the national standard, 10 test points are selected for the same film.

1. Separate the two laser sensors on the top and bottom of the film sample, and fix the sensors on the bracket.

2. Open the instrument, set the parameters, place the comparison block, and click "Confirm".

3. Take away the slider, re-set the same parameters as in step (2), and put in the film sample.

4. Take 10 different points respectively, and stagger the positions as much as possible to avoid affecting the data due to too close distance.

5. The measured value is transmitted to the computer through the serial port, and then processed by the thickness measurement software on the computer to obtain the thickness value of the target.

A high-precision coating thickness gauge can measure, but the film should not be too soft, otherwise it will be crushed.

This is the PD-CT2 of Zhongke Pudao

Dry or wet film? What substrate is the film on? If it is a coating thickness gauge, it has two principles, magnetic principle and eddy current principle, the magnetic principle is characterized by measuring the thickness of the non-magnetic cladding on the metal substrate (such as: steel, iron), the eddy current principle is characterized by measuring the thickness of the non-conductive cladding on the non-magnetic metal matrix (such as: aluminum, copper, stainless steel), Guangzhou Dongru has a DR380 that can meet the detection of these two principles at the same time.