Laser micrometers enable the non-contact diameter measurement of an object by looking at the size of the “shadow” it creates when placed in a laser scan.
Generally speaking, laser micrometers have a measurement process that follows a three-step sequence:
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Benefits of Using Laser Micrometers for Non-Contact Diameter Measurement
Speed and accuracy are the biggest benefits of using laser micrometers in manufacturing.
SpeedLaser micrometers have super fast scan rates, providing an average of 2000+ measurements per second. This rapid measurement rate makes laser micrometers particularly well-suited for monitoring the diameter of objects on high-speed production lines. |
Superior AccuracyLaser micrometers replace simple hand-held micrometers, which have limited use on today’s high-speed production lines.
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BenchMike Pro at LIMAB UK
Laser micrometers can also enable the precise measurement of round and cylindrical objects. Benchtop micrometers for off-line applications are used extensively when measuring precision machined components such as:
- Fuel injectors
- Cutting tools
- Medical devices
- Shafts
- Other cylindrical shaped components.
Laser micrometers can also provide rapid measurements of the ovality, taper, TIR, runout and effective diameter of cutting tools.
Components of a Laser Micrometer
Generally speaking, a laser micrometer has six core components:
- Transmitter and receiver: These are usually constructed in a single housing with a gap between them where the product measuring region is located.
- Laser source: Mounted on the transmitter side is the heart of the laser micrometer: a laser diode. The diode emits a low-power visible light and incorporates a lens to create the desired beam shape characteristics.
- Scanning motor: This rotates a multi-faceted mirror that creates a sweeping laser scan.
- Collimating lens: This creates the parallel laser scan that is sent from the transmitter side to the receiver side of the gauge,
- High-speed photodetector: On the receiver side, it measures the time taken for the laser to sweep across the object.
- Electronics: The processing unit that converts the electrical signal data from the detector into a calibrated diameter measurement and presents the measurement on the user display.
What to Consider When Choosing a Laser Micrometer
There are four key things to consider when choosing a laser micrometer.
1. Diameter Range
Every laser micrometer is designed to have a specific diameter range. When selecting a suitable laser micrometer, you must confirm that your components fall within the device’s minimum and maximum diameter range.
2. Scan Speed
Laser micrometers have a scan speed or measurement rate — a critical specification on fast production lines. The scan speed determines the separation distance between each measurement.
If you need a laser micrometer to detect a small diameter change on a fast-moving product, this will need to be calculated, and select a model that has a fast enough scan rate.
3. Displays and Interfaces
Displays and interfaces are critical in non-contact diameter measurement, making the process safer and more convenient for operators.
- The laser micrometer gauge head will need to be mounted at the point of measurement on the process line.
- However, the actual measurements can be displayed at a separate location. Usually, this is at the operator workstation or the main control panel.
Intuitive displays and interfaces can also channel real-time measurements to other process measurement and control systems — making data sharing faster and easier.
Most laser micrometers come with a range of interface options, so take the time to choose an interface that’s compatible with your existing systems.
Learn More About Laser Micrometers
Continuous in-process diameter measurement using laser micrometers enables manufacturers to improve efficiency and product quality. Learn more about laser micrometers through the links below:
Explore Our Range of Laser Micrometers at LIMAB UK
Our team of product specialists at LIMAB UK can analyse the unique needs of your business and provide one-to-one support to find the best non-contact measurement solution for you. Request a consultation today by calling +44 (0)1823 668633, emailing hello@limab.co.uk or submitting a contact form.
