Parent page: NIRCam Instrumentation
NIRCam's two modules (A and B) receive light relatively close to on-axis from the , as shown in the field of view in Figure 1.
Figure 1. NIRCam modules footprint in the JWST field of view
NIRCam's 10 detectorsare labeled. Each modulehas five detectors: four for the short wavelength channel and one for the long wavelength channel. Coronagraphimages are projected onto the detectors by an optical wedge (when needed).
From the NIRCam pickoff mirror, within each module, light passes through these components in the following order:
Figure 2. NIRCam optical train
Upper half of figure: NIRCam optical train
Bottom half of figure: the detector view, at the focal plane assembly (FPA), of incoming light, with and without a coronagraph wedge in the optical path. The coronagraph wedges are included on Lyot stop elements on each pupil wheel. Reproduced from Somerstein & Truong 2005.
Figure 3. NIRCam optical train in one module