| 摘要 |
An inventive optical cell measurement apparatus comprises a light source (S) which emits light having a predetermined wavelength range, a first mirror (M 1 ) which reflects the light emitted from the light source (S), a long light path gas cell ( 1 ) to which the light reflected on the first mirror (M 1 ) is introduced, a second mirror (M 2 ) which reflects light outputted from the long light path gas cell ( 1 ), a sensor (D) which detects the light reflected on the second mirror (M 2 ), and optical elements ( 21,22 ) disposed in a light path extending from the light source (S) to the sensor (D) and each having a bifocal property with different focal lengths as measured in two directions (X,Y) perpendicular to the light path. With this arrangement, the aberration of spherical mirrors ( 6,7 ) disposed in the gas cell ( 1 ) is corrected, thereby preventing reduction of the transmittance of the gas cell ( 1 ).
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