Figure 1. shows an interference fringe pattern projected onto an engineering component. This "structured light" system a
Posted: Mon May 02, 2022 3:43 pm
Figure 1. shows an interference fringe pattern projected onto an
engineering component. This "structured light" system adds
information to the image to enable accurate surface measurements to
be made and a four-frame phase stepping algorithm is used to
calculate height data. The system uses four fringe images with a
phase step of π/2 radians, giving four intensity values per pixel.
The recorded intensity values of the shifted fringe pattern for a
sample of a single row of pixels are given in Figure 2. As the
object's height is directly proportional to the final phase value,
use the intensity values given to calculate an unwrapped phase
distribution for the object surface.
Figure 1: Fringe pattern on object surface:
Figure 2: Intensity values. 11 12 13 14 222 76 121 234 226 89 98 232 231 103 84 228 229 128 67 224 235 152 59 219 231 171 53 209 231 185 29 201 231 199 53 189 232 206 66 173 230 210 55 143 230 216 74 126 224 217 86 104 226 222 113 81 219 220 136 69 213 223 155 62 202 222 174 51 190 224 174 62 176 222 199 56 157 225 205 54 137 223 211 56
engineering component. This "structured light" system adds
information to the image to enable accurate surface measurements to
be made and a four-frame phase stepping algorithm is used to
calculate height data. The system uses four fringe images with a
phase step of π/2 radians, giving four intensity values per pixel.
The recorded intensity values of the shifted fringe pattern for a
sample of a single row of pixels are given in Figure 2. As the
object's height is directly proportional to the final phase value,
use the intensity values given to calculate an unwrapped phase
distribution for the object surface.
- Figure 1 Shows An Interference Fringe Pattern Projected Onto An Engineering Component This Structured Light System A 1 (430.29 KiB) Viewed 33 times
Figure 2: Intensity values. 11 12 13 14 222 76 121 234 226 89 98 232 231 103 84 228 229 128 67 224 235 152 59 219 231 171 53 209 231 185 29 201 231 199 53 189 232 206 66 173 230 210 55 143 230 216 74 126 224 217 86 104 226 222 113 81 219 220 136 69 213 223 155 62 202 222 174 51 190 224 174 62 176 222 199 56 157 225 205 54 137 223 211 56