A system includes a first tube of a plurality of tubes, the first tube having a first end and a second end. The system further includes a light detector positioned at the second end of the first tube. The light detector is configured to detect an incoming light and determine light intensity information of the incoming light. The system further includes a material coupled to the first end of the first tube. The material is configured to change in transparency. The system further comprises a processor coupled to the light detector and the material. The processor is configured to receive the light intensity information from the light detector. The processor is further configured to determine that an intensity of the incoming light is above a threshold, and, in response to determining that the intensity is above the threshold, cause a change in transparency of the material.

A vehicular interior rearview mirror system includes an interior rearview mirror assembly having a mirror head adjustably mounted at a mounting structure. The mirror head includes a mirror casing and an electro-optic variable reflectance mirror reflective element. A glare light sensor senses glare light emanating from headlights of another vehicle rearward of the equipped vehicle. An ambient light sensor senses ambient light at the vehicle. The ambient light sensor comprises part of a rain sensing device disposed at an in-cabin side of a windshield of the vehicle. Mirror control circuitry is operable to adjust dimming of the mirror reflective element responsive to an output from the glare light sensor and an output from the ambient light sensor. Responsive to the output from the glare light sensor and the output from the ambient light sensor, the mirror control circuitry controls dimming of the mirror reflective element.

A system includes a first tube of a plurality of tubes, the first tube having a first end and a second end. The system further includes a light detector positioned at the second end of the first tube. The light detector is configured to detect an incoming light and determine light intensity information of the incoming light. The system further includes a material coupled to the first end of the first tube. The material is configured to change in transparency. The system further comprises a processor coupled to the light detector and the material. The processor is configured to receive the light intensity information from the light detector. The processor is further configured to determine that an intensity of the incoming light is above a threshold, and, in response to determining that the intensity is above the threshold, cause a change in transparency of the material.

A light sensor is provided that includes an exposed light transducer for accumulating charge in proportion to light incident thereon over an integration period; and a light-to-pulse circuit in communication with the exposed light transducer, the light-to-pulse circuit operative to output a pulse having a pulse width based on the charge accumulated by the exposed light transducer. The light-to-pulse circuit may include a one shot logic circuit that contributes to generation of the pulse. The light sensor may include an input/output pad, a capacitor provided at the input/output pad for blocking static electricity, an input low pass filter provided at the input/output pad for blocking electromagnetic interference, and/or a bandgap voltage reference circuit connected to a power source having a supply voltage level in a range of about 3.3V to about 5.0V, and for generating a set of stable reference voltages throughout the supply voltage level range.

A light sensor is provided that includes an exposed light transducer for accumulating charge in proportion to light incident thereon over an integration period; and a light-to-pulse circuit in communication with the exposed light transducer, the light-to-pulse circuit operative to output a pulse having a pulse width based on the charge accumulated by the exposed light transducer. The light-to-pulse circuit may include a one shot logic circuit that contributes to generation of the pulse. The light sensor may include an input/output pad, a capacitor provided at the input/output pad for blocking static electricity, an input low pass filter provided at the input/output pad for blocking electromagnetic interference, and/or a bandgap voltage reference circuit connected to a power source having a supply voltage level in a range of about 3.3V to about 5.0V, and for generating a set of stable reference voltages throughout the supply voltage level range.

A rearview assembly for a vehicle is provided that includes: a housing configured for mounting to the vehicle; a rearview element disposed in the housing that displays images of a scene exterior of the vehicle; a light sensor assembly disposed in the housing; and a controller for receiving the electrical signal of the light sensor and for adjusting a brightness of the images displayed by the rearview element. The light sensor includes a light sensor for outputting an electrical signal representing intensity of light impinging upon a light-receiving surface of the light sensor, and a secondary optical element configured to receive light, wherein the light passes through the secondary optical element to the light sensor, the secondary optical element including a tint material that is substantially color neutral for attenuating light passing therethrough.

A rearview assembly for a vehicle is provided that includes: a housing configured for mounting to the vehicle; a rearview element disposed in the housing that displays images of a scene exterior of the vehicle; a light sensor assembly disposed in the housing; and a controller for receiving the electrical signal of the light sensor and for adjusting a brightness of the images displayed by the rearview element. The light sensor includes a light sensor for outputting an electrical signal representing intensity of light impinging upon a light-receiving surface of the light sensor, and a secondary optical element configured to receive light, wherein the light passes through the secondary optical element to the light sensor, the secondary optical element including a tint material that is substantially color neutral for attenuating light passing therethrough.

Methods and systems for controlling tintable windows based on cloud detection.

A method of patterning lithographic substrates, the method including using a free electron laser to generate EUV radiation and delivering the EUV radiation to a lithographic apparatus which projects the EUV radiation onto lithographic substrates, wherein the method further includes reducing fluctuations in the power of EUV radiation delivered to the lithographic substrates by using a feedback-based control loop to monitor the free electron laser and adjust operation of the free electron laser accordingly.

A method of patterning lithographic substrates, the method including using a free electron laser to generate EUV radiation and delivering the EUV radiation to a lithographic apparatus which projects the EUV radiation onto lithographic substrates, wherein the method further includes reducing fluctuations in the power of EUV radiation delivered to the lithographic substrates by using a feedback-based control loop to monitor the free electron laser and adjust operation of the free electron laser accordingly.