Sensor head assembly having opposing sensor configuration with mount

An optical sensor assembly comprising:

• a housing structure;
• a frame having a top, a bottom and sides, the sides formed by posts extending between the top and bottom to form open sides;
• a first optical sensor secured between the posts of a first side of the frame, the first optical sensor being arranged to sense in a first direction;
• and
• a second optical sensor secured between the posts of a second side of the frame, the second optical sensor being arranged to sense in a second direction,
• wherein the first and second sides are opposite sides of the frame,
• wherein the frame includes a third side and a fourth side respectively disposed between the first side and the second side,
• wherein the first direction is from the third side to the fourth side,
• wherein the second direction is from the fourth side to the third side,
• wherein a portion of the first optical sensor extends from the fourth side to a region adjacent to the third side,
• wherein a portion of the second optical sensor extends obliquely from the third side to a region adjacent the fourth side, and
• wherein the portion of the first optical sensor is inclined in a direction perpendicular to the first and second directions more than the portion of the second optical sensor.