The thickness of polyethylene films may be measured in-line by using confocal displacement sensors. These ultra-precise sensors measure the thickness of thin, transparent sheet by simultaneously measuring both the top and bottom surfaces. The measurement probe is aimed perpendicularly to the sheet surface and the sheet must be stabilized during measurement so it's vibration amplitude does not exceed the span of the sensor system.
The thickness measurement of Plexiglas sheet is a very common application for laser displacement sensors. These product are often extruded between two polished rollers to squeeze the material into the desired thickness. This thickness must be measured and verified for in-process quality control. While any laser displacement sensor might measure to opaque polymer sheets, it is the translucent or transparent materials that require laser sensors with blue wavelength. These sensors, along with advanced detector electronics, reliably measure off the top surface and do not penetrate the material.
The metals fabrication business is one of the oldest industries in the world. Large mills are automated, but some smaller mills still rely on hand-held micrometers to gauge metal thickness. AR200 laser measurement sensors are ideal for measuring steel strip thickness to fine resolutions. Steel passes between two opposing non-contact laser sensors. A computer or PLC receives the sensors' output and calculates a resultant material thickness based on a simple mathematical formula that takes into consideration the separation distance of the two sensors. The sensors are synchronized such that they take distance samples at the same time.
Metal Thickness As Rolled Steel Passes Over A Cylinder
The forest products industry is a regular user of Acuity laser sensor products for the measuring of logs, cants, lumber, veneer thickness, paperboard, etc. The AR700 laser displacement sensors (previously used AR600 series) are commonly integrated into automated lumber finishing machines to measure board position, board dimensions and surface profiles. The AR600 laser measuring sensor is ideal for woods of varying colors and textures. The long-distance AR700 triangulation sensors offer a valuable stand-off distance, keeping the measuring equipment away from the quickly moving lumber and potential hazards.
The pantograph is the part of the high speed electric trains that comes into contact with overhead power lines. The contact surfaces need to be inspected while the train is in service and pass through an inspection point at high speeds. The AR4000 rangefinders are used to detect the presence of a passing train to trigger a high speed camera which captures the images of the brush surface of the pantograph. When a defect is detected, the train company is notified automatically and the operator of the train can then take action to avoid and eliminate the problem. Contact Acuity today to learn more about our laser sensors.
Acuity's laser rangefinders have unique benefits to certain applications that can not be met with other products. Some engineers specify high speed sampling and high accuracy. For these requirements, Acuity offers the AR4000-LIR and the AR2500.
Road surface profiling is an important part of highway and pavement engineering. Systems have been developed to collect real-time continuous highway-speed measurements of longitudinal profiles of road surfaces. From this data, engineers calculate International Roughness Index (IRI) or Ride Number (RN). Both of these numbers are expressions for the roughness (and therefore ride comfort) of a road surface.
Acuity's laser displacement sensors are an ideal tool for long-term bridge testing and for evaluating the position of pilings.
A large steel producer makes products in various shapes and sizes. Round bar stock is created by cutting a continuously-cast bar to specific lengths. Bar is fed down a roller conveyor and a laser rangefinder (AR1000) measures the position of the end relative to the distance to a saw blade. The length is displayed on a screen in a remote operator's booth as the distance data is transmitted via 4-20mA current loop signal.