The differences between accuracy and resolution of linear scale

Accuracy the correctness of the measurement result, precision said the repeatability and reproducibility of the test results, precision is the accuracy of the premise condition.

Ordinary resolution (resolution) is the precision of the screen image, refers to the number of pixels to display. For the grating ruler refers to the smallest unit can be measured.

Understanding of the resolution and precision of the sensor,

Can take micrometer, for example,

The resolution on behalf of the micrometer

Can read a few decimal places, but also a ruler and the machining accuracy, precision measurement method.

Similarly, in the use of grating ruler, resolution and accuracy are two different concepts.

The resolution of the grating ruler, is refers to the grating ruler can read and output the minimum length of change, the corresponding parameters are: per mm grating groove number, pulse number, segmentation, etc. Such as 50 line grating and 100 line grating resolution are different under the same conditions, the same line grating 50 if different segmentation method resolution will be different.

The precision of the grating ruler, is refers to the grating ruler of the output signal to measure the actual length of data accuracy, the corresponding parameter is micron (microns), nanometer (nm).

At present domestic grating ruler resolution generally have 5 microns, mu 1 m, 0.5 mu m, 0.2 mu m, 0.1 microns. So how are the resolution to come?

50 lines per mm grating, for example, after four segments, you can get the resolution of the simple 5 microns, instead of using electronic division, which is the current domestic machine feet most of the process, as for the high resolution raster ruler, we must adopt electronic subdivision technology, increase the interpolation to get fine separator. High resolution raster ruler generally applied in instrument such as a video apparatus, tool microscope, CNC machining center, etc.