Abstract:
The following steps are performed in connection with a photodiode circuit: a) resetting the photodiode circuit; b) determining when a photodiode voltage changes in response to illumination to reach a threshold; and c) updating a counter in response to the determination in step b). The steps a) to c) are repeated until an end of a measurement period is reached. The value of the counter at the end of the measurement period is then output to indicate an intensity of the illumination.
Abstract:
A photometric device with a wide dynamic range. The photometric device includes a constant current generation circuit, a fixed clock signal generation circuit which generates a fixed clock signal having a fixed frequency, a photoelectric conversion element, a variable clock signal generation circuit and a digital signal generation circuit. The fixed clock signal generation circuit generates a fixed clock signal that oscillates at a fixed frequency, from constant current The variable clock signal generation circuit generates a variable clock signal that oscillates at a frequency proportional to the amount of photocurrent, from photocurrent generated in the photoelectric conversion element. The digital signal generation circuit sets a measurement period using the fixed clock signal, counts the number of pulses of the variable clock signal that oscillates for the measurement period, and outputs a digital signal including the count value as data.
Abstract:
An optical sensor arrangement comprises a photodiode (11), dummy photodiode (12), an analog-to-digital converter (13), first switch (15) which couples the photodiode (11) to an input (14) of the analog-to-digital converter (13) and a second switch (16) which couples the dummy photodiode (12) the input (14) of the analog-to-digital converter (13).
Abstract translation:光传感器装置包括光电二极管(11),伪光电二极管(12),模数转换器(13),将光电二极管(11)耦合到第一开关 (13)的输入端(14)以及将模拟光电二极管(12)耦合到模数转换器(13)的输入端(14)的第二开关(16)。 p >
Abstract:
An optical sensor arrangement includes a photodiode, a dummy photodiode, an analog-to-digital converter, a first switch which couples the photodiode to an input of the analog-to-digital converter, and a second switch which couples the dummy photodiode to the input of the analog-to-digital converter.
Abstract:
The following steps are performed in connection with a photodiode circuit: a) resetting the photodiode circuit; b) determining when a photodiode voltage changes in response to illumination to reach a threshold; and c) updating a counter in response to the determination in step b). The steps a) to c) are repeated until an end of a measurement period is reached. The value of the counter at the end of the measurement period is then output to indicate an intensity of the illumination.
Abstract:
A sensor system, device and method for generating a wireless signal in response to a sensed illumination. A sensor is disclosed having: a photosensitive element; a device that converts a sensed illumination detected by the photosensitive element into a corresponding impedance response; and a wireless signal generator that generates a wireless output based on a characteristic of the corresponding impedance response, wherein the wireless output correlates to the sensed illumination.
Abstract:
An imaging device includes an exposure control unit, a determination unit, and an illuminance calculation unit. The exposure control unit is configured to control a plurality of exposure times. The determination unit is configured to determine whether or not saturation occurs using at least one data item of a plurality of data items obtained during the plurality of exposure times. The illuminance calculation unit is configured to calculate, if the determination unit determines that the saturation occurs, an illuminance using a data item different from the at least one data item used in the determination.
Abstract:
A photometric device with a wide dynamic range. The photometric device includes a constant current generation circuit (104), a fixed clock signal generation circuit (105) which generates a fixed clock signal having a fixed frequency, a photoelectric conversion element (100), a variable clock signal generation circuit (101), and a digital signal generation circuit (103). The fixed clock signal generation circuit generates a fixed clock signal that oscillates at a fixed frequency, from constant current. The variable clock signal generation circuit generates a variable clock signal that oscillates at a frequency proportional to the amount of photocurrent, from photocurrent generated in the photoelectric conversion element. The digital signal generation circuit sets a measurement period using the fixed clock signal, counts the number of pulses of the variable clock signal that oscillates for the measurement period, and outputs a digital signal including the count value as data.
Abstract:
Die Erfindung befaßt sich mit der Verbesserung eines Verfahrens und einer Vorrichtung zur Messung der Strahlungsabsorption durch ein Medium mit dem Ziel der Erreichung und Einhaltung einer hohen Meßgenauigkeit geringer Drift über eine lange Standzeit ohne Notwendigkeit zum Austausch einzusetzender Komponenten in kürzeren Abständen. Zur Lösung der Aufgabe wird verfahrensmäßig vorgeschlagen, daß durch das Medium Strahlungsblitze extrem kurzer Dauer hindurchgesandt und die empfangenen Strahlungsimpulse vor ihrer Weiterverarbeitung zeitlich gedehnt werden. Die Vorrichtung ist derart ausgestaltet, daß eine Strahlungsquelle eine Blitzlampe (11,12) aufweist und daß einem Detektor (13,14) ein die empfangenen Blitzimpulse zeitlich dehnender Verstärker (15,16) nachgeordnet ist.