An optical system may include a light source to provide a beam of light. The optical system may include a reflector to receive and redirect the beam of light. The optical system may include a light gate having an opening to permit the beam of light, from the reflector, to travel through the opening. The optical system may include a light sensor to receive a portion of the beam of light after the beam of light travels through the opening, and convert the portion of the beam of light to a signal. The optical system may include a processing device to determine whether a notch of a wafer is in an allowable position based on the signal.

The invention relates to a light barrier system, comprising at least two reflection light barrier devices, each of which is configured to emit a light beam and to detect a reflected light beam, wherein the light barrier system comprises a reflection body, which is configured to reflect back light beams emitted from at least two different directions in parallel, which are spaced apart at an angle of at least 20°, wherein the at least two reflective light barrier devices are arranged in such a way that they emit light beams from different directions onto the same reflection body in order to monitor at least two spatially different areas. In a further aspect, the invention relates to the use of a reflection body.

A system for remotely monitoring a depletion state of a sacrificial anode. The system includes a light emitter that is configured to emit a light beam and an optical receiver positioned to receive the light beam. A sacrificial anode is located between the light emitter and the optical receiver in a pathway of the light beam, the sacrificial anode being electrically coupled to a metallic structure for the purpose of minimizing corrosion of the metallic structure. Absent a presence of the sacrificial anode in the pathway of the light beam, the optical receiver is configured to receive the light beam, and in response to receiving the light beam, to generate an electrical signal indicative of the depletion state of the sacrificial anode.

A system for remotely monitoring a depletion state of a sacrificial anode. The system includes a light emitter that is configured to emit a light beam and an optical receiver positioned to receive the light beam. A sacrificial anode is located between the light emitter and the optical receiver in a pathway of the light beam, the sacrificial anode being electrically coupled to a metallic structure for the purpose of minimizing corrosion of the metallic structure. Absent a presence of the sacrificial anode in the pathway of the light beam, the optical receiver is configured to receive the light beam, and in response to receiving the light beam, to generate an electrical signal indicative of the depletion state of the sacrificial anode.

A laser radar device includes a laser radar optical system that emits laser light and receives reflected light of the laser light reflected from a reflector disposed outside the laser radar device. A controller determines that it is rainy weather when a measurement width of the reflector in a scanning direction of the laser light measured by use of the laser light and the reflected light is larger than a predetermined reference measurement width of the reflector.

A laser radar device includes a laser radar optical system that emits laser light and receives reflected light of the laser light reflected from a reflector disposed outside the laser radar device. A controller determines that it is rainy weather when a measurement width of the reflector in a scanning direction of the laser light measured by use of the laser light and the reflected light is larger than a predetermined reference measurement width of the reflector.

A system for remotely monitoring a depletion state of a sacrificial anode. The system includes a light emitter that is configured to emit a light beam and an optical receiver positioned to receive the light beam. A sacrificial anode is located between the light emitter and the optical receiver in a pathway of the light beam, the sacrificial anode being electrically coupled to a metallic structure for the purpose of minimizing corrosion of the metallic structure. Absent a presence of the sacrificial anode in the pathway of the light beam, the optical receiver is configured to receive the light beam, and in response to receiving the light beam, to generate an electrical signal indicative of the depletion state of the sacrificial anode.

A system for remotely monitoring a depletion state of a sacrificial anode. The system includes a light emitter that is configured to emit a light beam and an optical receiver positioned to receive the light beam. A sacrificial anode is located between the light emitter and the optical receiver in a pathway of the light beam, the sacrificial anode being electrically coupled to a metallic structure for the purpose of minimizing corrosion of the metallic structure. Absent a presence of the sacrificial anode in the pathway of the light beam, the optical receiver is configured to receive the light beam, and in response to receiving the light beam, to generate an electrical signal indicative of the depletion state of the sacrificial anode.

A parking management system is described that includes a light detector, a reflector positioned within a parking space and aligned to direct received light to the light detector, and a processor receiving a signal from the light detector that indicates an amount of light detected by the light detector. The processor causes a parking space indicator to indicate that the parking space is unoccupied based on the amount of light detected by the light detector being greater than a threshold, and causes the parking space indicator to indicate that the parking space is occupied based on the amount of light detected by the light detector being less than the threshold.

A seed pod shatter test system for determining the resistance to seed pod shattering in various plants, wherein the system comprises a mobile platform that is structured and operable to traverse at least one row of plants growing in plot, and at least one plant engaging head mounted to a front of the mobile platform. The at least one plant engaging head is structured and operable to condition each of the plurality of plants by contacting each of the plants in the row(s) with a predetermined amount of force as the mobile platform traverse the row(s) of plants. The system additionally comprises a data collections and analysis system that is structured and operable to determine an amount of seed pod shattering that occurred in the plurality of plants as a result of the conditioning.