You could probably do so with something like this right now, pointing it at the ribbon: https://pki-electronic.com/products/audio-surveillance-equipment/laser-m

You could probably do so with something like this right now, pointing it at the ribbon: https://pki-electronic.com/products/audio-surveillance-equipment/laser-microphone/ https://pki-electronic.com/products/audio-surveillance-equip... Or just a sheet of glass in front of the singer.