The TSOP4P38 is quite similar to the units you mention, except it uses the attenuation of sensitivity by the AGC in the presence of a continuous ("pseudo-continuous") 38 KHz modulated beam to give an analog signal proportional to proximity. The sensing is based on measurement of the reflected beam.
That application is different than the ones you discuss based on beam break.
John
That application is different than the ones you discuss based on beam break.
John