Can AOI machines detect LED light brightness

Xenon light source has a wide range of applications, and various photocatalytic experiments, such as photolysis of water to hydrogen, photocatalytic CO2 reduction, and photodegradation of pollutants; simulated daylight and visible light acceleration experiments; Research on all kinds of simulated solar ultraviolet band acceleration experiments. The PLS series is a strong light full-band light source with continuous wavelength distribution. It is suitable for photochemical research of visible light and ultraviolet, various experiments simulating sunlight, especially for strong photocatalysis (such as photolysis of water to hydrogen, photodegradation and other photocatalytic studies).

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AOI (Automated Optical Inspection) stands for Automatic Optical Inspection, which is a device that detects common defects encountered in welding production based on optical principles. AOI is a new type of testing technology that is emerging but developing rapidly, and many manufacturers have launched AOI test equipment. When automatically detected, the machine automatically scans the PCB through the camera, collects images, compares the tested solder joints with the qualified parameters in the database, checks out the defects on the PCB after image processing, and displays the defects through the display or automatic signs for maintenance personnel to trim.

You can test it with an integrating sphere, and our company has tested Zhaochang's LED fluorescent tube, and the test results are quite accurate.

The devices to measure wavelength and brightness are more expensive.

If it is not to measure brightness, but illuminance, and not to measure wavelength, then you can use a lux meter, which is portable, not as large as a multimeter, and should not be expensive.

A more advanced one is similar to a power meter, and it can be bought for thousands of dollars. However, they can only measure illumination, not brightness.

Splitters or integrating spheres are fine.

The light source is checked with a swatch, and the swatch is generally a solid black and white board or other colors! Different machines are different, and there is a light source correction function in the AOI software! Put the swatch in, and the machine will compare and correct it with reference to the parameters of the board you put in!

The swatch should be well maintained, and there should be no dirt or bumps on it!

That's a good answer, but sometimes the correction is unsuccessful, so you have to adjust the aperture. Usually pay more attention to maintenance, don't let the LED light plate be dusty, or there is dust on the camera, it is best to keep the test platform clean.

Generally, light detection sensors, light sensitive sensors.

In the process of testing the brightness of LED chips and evaluating the safety of LED light radiation, imaging methods are usually used, and microscopic imaging can be used to measure the test of chips. Luminosity is the luminosity l at a certain point on the luminous surface of a light source, and is the quotient of the luminous intensity of the face ds in a given direction divided by the positive projection area of the face element perpendicular to the plane in a given direction

The unit of brightness is candela per square meter (cd m2). When the luminescent surface is perpendicular to the measurement direction, then cos 1.

LED light sources are gradually replacing the incandescent and fluorescent lighting market as a new generation of lighting sources because of their long life, low energy consumption, high reliability, and easy control.

There are three ways to measure the luminance of LEDs:

commonly used imaging photometers and shading cylinder photometers; Imaging photometers are our common color photometers and color luminance meters. It is often used in the brightness test of LED display, and it can only test the brightness value of a small area of the LED display.

Pixel grayscale measurement system using CCD; The main principle is to use CCD to collect the image of the LED display, and then use image processing technology to process the image and extract the gray value of each pixel of the LED display. So as to calculate the relative brightness value of each pixel of the LED display.

Photometer with CCD technology. Using CCD to collect LED display gray data, it improves the defect that the previous two kinds of luminance meters can not measure a large area of brightness source, has good real-time, can obtain a large amount of information, and can obtain the gray value of each pixel of the LED display screen imaging on the CCD. However, this gray value cannot be equivalent to the actual brightness value, and even lacks a strict linear relationship with the brightness value.

There are few luminance meters from general manufacturers, which are too expensive. And it doesn't make much sense to measure the brightness of the light source at ordinary times. Unless it is a special industry, such as making backlights.

Because the backlight screen emits light for the eyes to see directly, it needs to be assessed by brightness. Measuring the brightness of LEDs makes little sense for the application. Because LEDs are more versatile.

As the light source of the backlight screen, the assessment is not the direct LED brightness. When used for lighting, whether it is dazzling or not is also related to the brightness of the surrounding environment. Therefore, the lighting does not take the brightness of the light source as a parameter index.

Just follow the instructions for using the luminance meter. Brightness is originally a numerical value that illuminates the intensity of the unit area of the object, not the brightness of the LED luminous point.

The photometry of the light source is usually only seen in the packaging production line.

I use different diode brightness comparison test methods, with several different brands of different sizes each connected to the power supply, look at the brightness, you know.

The way to detect blue light in LED lamps is to use a spectrometer to measure the presence of blue light.

Generally speaking, the products listed by regular manufacturers after national quality inspection will not have the hidden danger of excessive blue light.

However, some LED lamp manufacturers do not pay attention to controlling the intensity of blue light, and the blue light in the LED lamps produced is "excessive", which has blue radiation damage to the eyes. In life, there are many light sources that can emit blue light.

Bath bombs, flat panel displays, LED neon lights, fluorescent lights, LCD monitors, iPads, large-screen mobile phones, etc., all have background light sources, and they all contain short-wave blue light. If the blue light is "excessive", it will affect the retina, so you should avoid looking directly at the light source with your eyes, and pay attention to the time of use, and close your eyes and rest every 20-30 minutes.

That's the right question to ask...Blue light is mainly related to color temperature, in fact, most of the LED lights have blue light, and the eye protection lights are only low in blue light, not completely without blue light, and there is no blue light at all....Not only is it rare on the market, but it is also basically not needed in life.

Generally speaking, looking at the color of the light is the simplest and crudest way to distinguish blue light, but it is not very accurate. Usually, the blue light that is white is strong, and the blue light that is yellowish is weak, so the eye protection lamps are basically yellowish.

If you feel that it is not accurate to see with your eyes, then you can look at the parameters of the lamp, which will be more intuitive, if your lamp is bought by a regular manufacturer, then you can look at the parameters of the bulb or the lamp, which are written clearly, and look at the value of the unit k, for example, my bulb can be removed to see the color temperature, voltage and other parameters.

Here are only some data references for the subject:

The color temperature is 6500K, and the blue light is 2 times that of light, which is not good for the eyes.

The color temperature is 4000K, and the blue light is 40% lower than the light, which belongs to the category of eye protection lights.

The color temperature is 3000K, and the blue light is 80% lower than the light, which is very eye-friendly.

Note,The subject can search for the 3000k light source**,In fact, the 3000k light source is already very yellow and very warm,However, there is still a small amount of blue light,There is no blue light at all, it is really rare and rarely used,Usually there is a slight blue light。

If there is a baby at home, it is recommended to choose 2700k, 3000-4500k for children's table lamps, and it is not recommended to be higher than 5700k for indoor main light sources.

If the subject does not believe in the authenticity of the manufacturer's parameters, if you have to self-test the blue light, you can find a special detection instrument to detect the spectrum and other parameters, the accuracy is relatively high, and you can even make a report, the report not only has color temperature, but also various data such as the display index, but this is too professional, most people don't need it, and the regular manufacturers can't hide the color temperature, look at the parameters to roughly measure the strength of the blue light, self-test is really not necessary.

In addition, color temperature is not the only indicator of eye protection, the light with a high index is also more eye-friendly, the index is the color rendering, it is recommended to choose a more than 95 index display, the index is not easy to be tired of eyes, and it is better for the eyes.

In addition, in the case of different indoor areas and different floor heights, the applicable wattage should also be adjusted to achieve the appropriate illumination.

Then there is the control of the time of eye use, and then the eye protection lamp will still get tired after reading for a long time.

LED lights.

It's not the same name you gave, it's not easy to find.

1. Definition of color temperature:

It is expressed by the absolute temperature k, that is, the standard black body is heated, and when the temperature rises to a certain extent, the color of the black body begins to be dark red-light red-orange-yellow-white-blue, and gradually changes, when the color of a light source is the same as that of the black body, we call the absolute temperature of the black body as the color temperature of the light source.

2. Color temperature in different light source environments:

The following is a comparison table of color temperature used in common LED lighting fixtures:

Halogen lamp 3000k

Tungsten lamp 2700k

High Pressure Sodium Lamp 1950-2250K

Candle light 2000k

Metal halide lamp 4000-4600k

Cool Camp Light 4000-5000K

High Pressure Mercury Lamp 3450-3750K

Warm fluorescent light 2500-3000k

Clear Sky 8000-8500k

Cloudy 6500-7500k

Summer midday sun 5500k

Afternoon daylight 4000k

3. LED light color at different color temperatures:

1. Low color temperature: the color temperature is below 3300K, and the light color is reddish to give a warm feeling; There is a calm atmosphere, a warm feeling; When illuminated with a low color temperature light source, the red color can be more vivid.

2. Medium color temperature: the color temperature is in the middle of 3000-6000K, and there is no particularly obvious visual psychological effect under this tone, and there is a refreshing feeling; So called"Neutral"Temperature. When illuminated with a medium color temperature light source, the blue color is had.

Refreshing sensation. 3. High color temperature: the color temperature exceeds 6000K, and the light color is blue, giving people a cold feeling.

1. The items that can be detected by AOI include: missing parts, multiple parts, wrong parts, cheap, side standing, monument, reverse paste, extreme reversal, replacement parts, IC pin bending, and text recognition.

2. Automatic optical inspection (AOI, automated

optical

inspection)

As an effective detection method for industrial automation, machine vision is used as the standard technology for inspection, which is widely used in LCD TFT, transistor and PCB industrial processes, and can be extended to security systems for people's livelihood purposes. Automated optical inspection is a common method used in industrial manufacturing to obtain the surface condition of the finished product by optical means, and image processing is used to detect defects such as foreign objects and pattern abnormalities, and because it is a non-contact inspection, semi-finished products can be inspected in the intermediate process.

It is used to detect many defects in PCBA, such as wrong parts, offset, floating, warping angles, ......And so on, our company uses the products of Leichen Technology, which has a good reputation in the industry.