Here's the FuG.280 infrared target tracking system nose installation, as it would have been before the crash. The dipole aerials around it are for the FuG.220 radar ("SN-2" system, as referenced in the ADI Science critique of the Ultra decrypts), which the Heston Ju88 was also recorded as carrying. Other Ju88's sometimes had centimetric, higher frequency, radar systems, with fully faired in nose cone radar aerials, but that area was given over to the FuG.280 infrared in the case of "Air Ministry 32".
..and here's the infrared detector and scanning mirror, with the covers off. I imagine that the heat signal-shielding grid on the glass cover, corresponded with a matching grid on the face of the cathode ray tube in the cockpit, used by the operator. If the operator was not the pilot himself, then he would be able to quickly guide the pilot towards the target with simple grid sector voice steering guidance e.g., "low left", "middle centre", "upper right", etc.
