Intermeshing light barrier features in optical physiological parameter measurement device

An optical physiological parameter measurement apparatus, comprising:

• a first photodetector;
• a second photodetector;
• a photo-emitter;
• a first barrier wall interposed between the photo-emitter and the first photodetector, the first barrier wall including a first recess;
• a second barrier wall interposed between the photo-emitter and the second photodetector, the second barrier wall including a second recess;
• a window;
• a first protrusion that is attached to or part of the window, the first protrusion including a surface profile that when intermeshed with the first recess provides relative stability between the window and the first photodetector, the second photodetector, and the photo-emitter along a single axis of motion;
• and
• a second protrusion that is attached to or part of the window, the second protrusion including a surface profile that when intermeshed with the second recess also provide relative stability between the window and the first photodetector, the second photodetector, and the photo-emitter along the single axis of motion.

A method, the method comprising:

• providing an optical physiological parameter measurement sensor module including:
• a photo-emitter element,
• a photodetector element, and
• a barrier wall interposed between the photo-emitter element and the photodetector element, the barrier wall including one or more barrier wall surfaces;
• providing a window that includes a protrusion that is attached to or part of the window, the protrusion including one or more protrusion surfaces;
• positioning the window and the optical physiological parameter measurement sensor module relative to one another such that a subset of the one or more barrier wall surfaces defining a first surface profile and a subset of the one or more protrusion surfaces defining a second surface profile intermesh with one another between the photo-emitter element and the photodetector element;
• and
• fixing the window and the optical physiological parameter measurement sensor module in place relative to one another.