This creation is that a kind of temperature measuring device includes an ontology, an infrared sensor and an optical filter. This system includes a shell, has an opening portion. Infrared sensor system corresponds to what opening portion setting what enclosure interior. What opening portion, and the opening of substantially closed peristome is arranged in optical filter system, and wherein optical filter can filter out the light of the non-IR wavelength of at least part, so that infrared sensor can pass through optical filter and sense the infrared ray that an object under test radiates. Optical filter system may filter that the light of at least a part of non-IR wavelength； reduce the interference of other wavelength lights； improve precision and the sensitivity of measurement； and can avoid extraneous particle, it is dirty enter to enclosure interior to protect infrared sensing unit, use and keep the good service life for measuring effect and increasing temperature measuring device.本創作係一種溫度量測裝置包含一本體，一紅外線感測器，以及一光學濾片。本體係包含一殼體，其具有一開口部。紅外線感測器係對應於開口部設置於殼體內部。光學濾片係設置於開口部，且大致封閉開口部之開口，其中光學濾片可濾除至少一部分非紅外線波長之光線，以使紅外線感測器可透過光學濾片感測一待測物體所輻射之紅外線。光學濾片係可過濾至少一部份非紅外線波長之光線，減少其他波長光線之干擾，提高量測結果之精準度與靈敏度，且可避免外界的微粒、髒污進入至殼體內部以保護紅外線感測單元，藉以保持良好的量測效果及增加溫度量測裝置的使用壽命。
