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Why do you need a road surface profiler?

Views:1     Author:Site Editor     Publish Time: 2020-08-22      Origin:Site


The road surface profiler’s optical components can produce large projection points and the internal sampling rate can be several times higher than the output. The polygon mirror on the road surface profiler allows the projection point to sweep across the width of the road. Another advantage is that the projection point in the scan direction is effectively widened.


Road Surface Profilometer (Testing System For Pavement Quality)

The article is mainly about three parts:


1. Cover the entire road

2. The multi-sided mirror on the road surface profiler

3. The reflective road surface profiler's Ladar feature

 

1. Cover the entire road


The road surface profiler scans with a rotating polyhedral mirror. The optical part can produce large projection points, and the interior can be sampled several times higher than the output, thus giving full play to the advantages of phase-shifted lidar (Ladar) technology. With a single sensor, it is possible to cover the entire road, not just the narrow gap between the wheels. In addition to being able to measure the high and low profile of the road, the realization of laser digital also enables it to measure the reflectivity of various bump points of the road. Projection point size the projection point size of the road profile measurement is very important. If the projection point is too small compared to the surface texture, the resulting bump will contain some extraneous high-frequency components. Systems based on existing mainstream triangulation sensors overcome this problem by averaging multiple sampling points. The projection point size of the road surface profiler is 20mm in the direction of the garage and 6mm in the scanning direction. Such a size can effectively reduce the sampling noise.


2. The multi-sided mirror on the road surface profiler


The multi-sided mirror on the road surface profiler rotates at 10,000 RPM, allowing projection points to sweep across the width of the road. If the speed is 100 km/h, a new line of scanning will be started every 2.8cm. In different applications, not every scan is recorded. Scanning turns a sensor into a multi-point measurement tool. This allows it to measure a large area over multiple points. These are difficult to achieve with a single triangulation sensor. Install the road surface profiler without sticking out of the car significantly. In addition, its installation height is 2.15m above the road surface, which will not be damaged in fender bender accident, while the sensor using Rut bar will be completely destroyed in such accident. The road surface profiler optimizes the accuracy of high and low profile measurements because it oversamps at 24 times the output frequency. A high-speed electronic circuit is used to calculate averages before recording.


3. The reflective road surface profiler's Ladar feature


Another advantage of this process is that the 6mm projection point in the scan direction is effectively widened in the scan side averaging. The effect of pavement texture is further reduced.


The reflective road surface profiler's Ladar feature is implemented using a sophisticated RF analog front end. It USES high-speed digitization and signal processing techniques similar to those used in modern mobile phones and global positioning systems. It also has the added advantage of being able to measure the reflectivity of bump points. Lane divisions can be easily detected by the road surface profiler. In this way, the obtained data can correspond to the location of the road surface, thus overcoming the shortcoming that the current road surface measurement is difficult to determine the specific location.

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