Detecting device

A detecting device configured to detect a physiological parameter of a biological tissue, the detecting device comprising at least one detecting module, the detecting module comprising:

• a light source configured to emit a first beam and a second beam, wherein a wavelength of the first beam is different from a wavelength of the second beam;
• at least one light detector;
• a package disposed on the light source and the at least one light detector and located in transmission paths of the first beam and the second beam from the light source;
• an outer cover covering the light source, the at least one light detector and the package, and the outer cover comprising a top surface;
• and
• an optical microstructure located in the transmission paths of the first beam and the second beam, and arranged in parallel with the top surface of the outer cover;
• wherein the optical microstructure comprises at least one set of circles of different radii, the circles are full circles, circular segments, or a combination thereof;
• wherein the first beam and the second beam are emitted from the light source and are configured to pass through the package;
• upon passing through the package, the first beam and the second beam are configured to be diffracted from the optical microstructure and transmitted to a biological tissue;
• upon transmission to the biological tissue, the first beam and the second beam are reflected from the biological tissue towards the optical microstructure, the reflected first beam and the reflected second beam are configured to be diffracted from the optical microstructure and pass through the package;
• upon passing through the package, the reflected first beam and the reflected second beam are configured to be transmitted to and be detected by the at least one light detector.