In order to extract the polarization transfer observables it is necessary to
know both the polarization of the incident proton and the polarization of
the outgoing neutron. The neutron polarization is found by using the
analyzing power of the scattering reaction with, primarily, the hydrogen in
the front plane of the scintillator. Therefore, the analyzing power, as
defined in equation 
, of the detector must be determined before
the polarization of the neutrons can be extracted via the formulae:
where 
is the effective analyzing power of the detector, and
and 
are the ``asymmetries'' corresponding to
neutron polarizations in the 
and 
directions,
respectively. The
asymmetries are defined as a difference in the number of polarized
particles scattered in one direction versus the opposite direction
normalized to the total number of scattered particles. Typically (i.e. in
the beamline polarimeters) this is measured by putting one detector to the
left of an analyzing target and another to the right and comparing the
difference in counts. However, because of the unique design of the INPOL
polarimeter, which doesn't have a single small analyzing target, a method
called the sector method is used.