What kinds of sensors can detect human hands?

Depends If you are looking for thermal sensor then the D6T thermal sensor is able to detect the presence of stationary humans by detecting body heat. read more

Transducer converts the measurand into the desired output using the transduction principle.There are various types of sensors like temperature sensor, IR sensor, touch, sensor, motion detectors, biosensor, accelerometer and many more. There are certain features which have to be considered while choosing a sensor. read more

For an isolated area, different sensors can be used to detect the human presence. Heat detectors as body has some heat. Pressure detectors- they might fail if some James bond tries to break in but works fine with realistic people. Infrared sensors; Proximity sensors near doors or windows or between 2 objects. read more