Broadband high-resolution spectroradiometer based on a virtually imaged phased array

A novel broadband, high-resolution spectroradiometer based on a virtually imaged phased array (VIPA) has been developed to meet the stringent requirements for high-precision vertical profiles of key atmospheric constituents. The instrument operates within the spectral range of 7535-7680 cm^-1, achieving a spectral resolution of 0.023 cm^-1 (690 MHz) with an integration time as short as 400 ms. Using this system, high-resolution atmospheric transmittance spectra in the 7535-7680 cm^-1 band were successfully measured, and the vertical profile of water vapor was retrieved using the optimal estimation method (OEM). The results demonstrate that the novel VIPA-based spectroradiometer enables rapid acquisition of high-resolution atmospheric transmittance spectra over a broad spectral range, providing a robust and effective new approach for remote sensing of key atmospheric constituents. To the best of our knowledge, this represents the first successful application of a VIPA-based spectroradiometer for retrieving vertical profiles of atmospheric constituents.