Some can be detected by Photomicrosensors and others cannot. Please advise possible causes and countermeasures.
In the case of the phototransistor output model, one of the causes is estimated to be individual variation in light current (IL). In this case, the circuit design should be reviewed.
As Photomicrosensors are composed of semiconductor components, the light current values of individual sensors are different. Therefore, it is necessary to check the range of the light current (IL) specified in the datasheet and to design the circuit so that the sensor can operate at the upper and lower limits. In addition, take into account changes in the light current due to changes in the LED over time and changes in the ambient temperature, and set the optimum threshold value.
For details, refer to Thechnical Information for Photomicrosensors as well as the following related FAQ.
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