QVA11134

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Optical Sensors are one of the most widely used sensors in modern electronics. They provide accurate data feedback on the environment, helping to diagnose and troubleshoot numerous applications. The QVA11134 is a photointerrupter specifically designed for slot type applications with transistor output. This article will cover its application field and working principle.

Application Field

The QVA11134 is most notably intended for presence detection and pulse generation. It is small in size with dip mountable package, allowing it to fit in precisely into narrow spaces. This makes it especially well suited for presence detection in thin equipment, machines, and other electronics, such as printers, scanners and other office automation equipment. In solar cell and display devices, this sensor can be used to accurately detect the presence of a light beam.

Working Principle

The QVA11134 utilizes a high-sensitivity slot type phototransistor to sense the interruption of a light beam. When no illumination is present, the sensor output is at a low level (0.2V max). This corresponds to the absence of an object. When a presence is detected, the output will switch to a high level with a maximum of 5V. The light source, determined by the cut-off dimension, is determined to be an IR LED. The minimum emission level of the LED is determined by the parameter of the QVA11134.

The synchronization of the output signal is determined by the pulse width modulation scheme used. The PWM logic capably patterns the duty cycle and filter frequencies allowing for a fool proof synchronization. The PWM output also offers an impressive frequency response of up to 1 MHz, making this sensor ideal even for very high speed responses.

Apart from the synchronization, the QVA11134 also provides a very accurate output detection with an exceptionally high off-state impedance (100kΩ min). It also supports a wide operating temperature range of -30 to 85 °C, allowing for it to be used in various harsh environment. Other noteworthy features of this sensor includes a sharp turn-on response time of a mere 5 μs and low power consumption.

Conclusion

The QVA11134 photointerrupter is a precisely engineered optical sensor designed for slot-type applications with transistor output. It is small in size, making it ideally suited for thin machinery and equipment. Its features, such as a fool proof synchronization, a wide operating temperature range and low power consumption makes it one of the most versatile sensors on the market.

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