It is now possible to address this disadvantage by using an InGaAs detector instead of a Pbs
detector for the near infrared region; this detector is 50 times more sensitive. When measuring reflectance,that only diffuse reflectance is measured. When measuring
transmittance, direct transmittance can be excluded by removing the standard fitting from the port facing the incident beam so that only diffuse transmittance is measured. a specular flap can be used to exclude specular reflectance so