How to Properly Choose an Industrial Camera?

Industrial cameras are designed for use in manufacturing, quality control, scientific research, and other industrial environments. They differ from consumer cameras in terms of specifications, performance, and application. To choose the right industrial camera, you should consider several key factors. Here's a detailed guide on what you should know when selecting an industrial camera:

1. Do You Need a Black-and-White or Color Camera?

An image consists of a grid of pixels, each representing a value corresponding to its color intensity.

Black-and-White Cameras: Black-and-white sensors generally offer higher sensitivity and better resolution because they don't use color filters. This feature makes them ideal for applications where color information is not required, such as in text recognition, measurement, and inspection.
Color Cameras: Color cameras are used in applications where color information is critical, such as medical electronics and color printing inspection. Color cameras use color filters that reduce their sensitivity and resolution compared to black-and-white cameras.

Choose a color camera when color information is required, and a black-and-white camera for applications that need higher resolution and sensitivity.

2. What Image Resolution Do You Need?

Resolution determines the level of detail in an image and is crucial for applications that require precise measurements.

Area Array Cameras: For measuring dimensions, detecting shapes, and other general-purpose applications, area array cameras are commonly used. To calculate the necessary resolution, you should know the expected measurement precision and the dimensions of the inspection area.

Example: If the inspected area is 10 mm in length and you need 0.01 mm precision, you require at least 1,000 pixels for this dimension (10 mm / 0.01 mm = 1,000).

Line Array Cameras: Line array cameras are typically used for high-speed applications and situations where the inspected area is a continuous strip. To determine the required line array resolution, divide the width of the object by the desired precision. The line frequency must match the object's speed.

Example: For a 1600 mm-wide object with a required precision of 1 mm and a speed of 22,000 mm/s, the required line frequency is 22,000 mm/s divided by the resolution (0.8 mm), resulting in a line frequency of 27.5 kHz.

3. What Frame Rate Do You Need?

Frame rate refers to the number of images a camera can capture per second. The required frame rate depends on the speed of the inspected object.

General Monitoring: Frame rates above 25 fps are sufficient for real-time observation.
Automatic Inspection: The frame rate should be at least the same as the number of items inspected per second.
High-Speed Applications: Frame rates of 200 fps or higher may be required for very fast-moving objects.

Ensure the frame rate matches or exceeds your required capture speed.

4. Do You Need a CCD or CMOS Camera?

CCD and CMOS sensors have different characteristics and suit different applications.

CCD Sensors: Known for higher sensitivity, CCD sensors are typically used for low-light applications and situations requiring high dynamic range.
CMOS Sensors: Generally more power-efficient and faster than CCD sensors, CMOS sensors are often used in high-speed applications.

Decide between CCD and CMOS based on your application's sensitivity, power, and speed requirements.

5. What is the Minimum Exposure Time Required?

To capture fast-moving objects without motion blur, choose a camera with a short exposure time.

Exposure Time Calculation: The exposure time should be shorter than the distance an object travels during the exposure period. If a 10 mm object is moving at 5 m/s, and the required precision is 0.01 mm, the maximum exposure time is given by the distance traveled divided by the desired precision.

Example: If an object moves at 5 m/s and the desired precision is 0.01 mm, the maximum exposure time is: $T_{e x p} = object speed distance traveled = 5 m/s 0.1 mm = 20 μ s .$

Conclusion

Choosing the right industrial camera involves understanding your application's requirements for resolution, frame rate, sensor type, and exposure time. By following the outlined steps, you can make an informed decision that ensures accurate and efficient data capture in your industrial environment.

FALenses Technology specializes in providing machine vision core hardware. You can go to the official website of FALenses Technology at https://www.falenses.com/ for more information.