Method for manufacturing a detector

A method for manufacturing a detector, the method comprising:

• printing an electronic circuit on at least a first side of a flexible, printable substrate;
• coupling a first electronic component and a second electronic component to the electronic circuit on at least the first side of the flexible, printable substrate;
• thermoforming the flexible, printable substrate to form at least one detection zone from:
• (i) at least one side of the flexible, printable substrate having an angle for emitting light from the first electronic component;
• and
• (ii) at least one side of the flexible, printable substrate having an angle for receiving light by the second electronic component;
• wherein the first electronic component is a light emitter and the second electronic component is a light receiver, the second electronic component configured to receive light from the first electronic component scattered by particles in the at least one detection zone;
• wherein the light emitter is positioned on a first sloped surface and the light receiver is positioned on a second sloped surface, the first sloped surface positioned at an angle relative to the second sloped surface, the angle being greater than zero degrees.