Polarization Sagnac interferometer with reflective grating for white-light channeled imaging polarimeter

•A channeled modulated snapshot polarization imaging technique is presented.•The core part consists of 2 reflective blazed grating and 1 polarizing beam splitter.•It can simultaneously obtain targets with multiple Stokes parameters.•Simple image processing, simple structure, low cost, portable size, easy adjustment.•Experiment shows that the accuracy of the measured Stokes parameters is well. The white-light channeled modulated snapshot polarization imaging technique can simultaneously obtain targets with multiple Stokes parameters, it need not require image registration and has a simple structure. Hence, it attracts lots of attention in recent years. The theoretical analysis and experimental structure of a white-light channeled modulated snapshot polarization imaging technique are presented in this study. The core part of the instrument is only composed of three components with low cost, portable size and easy adjustment. Results has shown that the RMS between the measured and the theoretical value of normalized Stokes parameter is 0.0276. The outdoor experiment shows that the model can obtain S0, S2 and S3 in the target Stokes parameters in white-light.