| 摘要 |
In one embodiment, an apparatus for measuring pressure is provided including a holographic element 123 containing at least one volume hologram 123a, a reference member a sensing member coupled to the pressure being measured, and at least one light source 121 wherein the device operates by passing a reference light beam between the reference member and the holographic element, the reference beam having a constant optical path, and passing a sensing light beam between the sensing member and the holographic element, the sensing beam having optical path that varies as a function of the pressure the volume hologram converting the reference beam and the sensing beam into an information light beam the intensity of which is a measure of the pressure. Preferably, the reference member and the sensing member are made from the same material. |
