IEEE Geoscience and Remote Sensing Magazine - December 2019 - 27

larger than Hyperion [28] and EnMAP [29], respectively)
can be achieved.
IMPROVED MULTISLIT LOW-DISTORTION OFFNER
CONVEX-GRATING SPECTROMETER
A small F-number correction lens was used to improve
the FOV and spectral flatness. As illustrated in Figure 6, a
correction lens was placed at the convex grating of the

traditional Offner structure. The optical path passed
the lens twice, and the symmetrical structure effectively
corrected the spectral bending as well as the additional
astigmatism and field curvature. With the increase of the
FOV, the dispersion radius of the traditional Offner structure increased significantly, while that of our improved
structure remained quite small (4.2 nm) when the FOV
reached 300 mm, as detailed in Table 3. By using multislit

TABLE 2. THE PARAMETERS OF OFF-AXIS TMA STRUCTURES
WITH AN FOV OF 2.3° AND 1.4°, RESPECTIVELY, IN THE
ALONG-TRACK.
Mirror
B1

Mirror
B2

b

Mirror A

D

Slit 1

Slit 2

FOV (°)

CROSS-TRACK: 4.86
ALONG-TRACK: 2.3°

CROSS-TRACK: 4.86
ALONG-TRACK: 1.4°

Volume

650 mm × 610 mm × 400 mm

600 mm × 550 mm × 400 mm

M1

360 mm × 340 mm
#12 aspheric surface

360 mm × 340 mm
#4 aspheric surface

M2 (mm) U 150

U 150

-

-

-

M3

320 mm × 200 mm
#12 aspheric surface

320 mm × 200 mm
#4 aspheric surface

d′

a

FIGURE 4. The optical path diagram of the field separator.

650 mm

M1

M2
M3

610 mm
(a)

FIGURE 6. The optical path of the improved Offner structure.

600 mm

M1

M2

M3
550 mm
(b)

FIGURE 5. The main optical TMA structure with an FOV in the

TABLE 3. THE DISPERSION RADIUS OF TRADITIONAL AND
IMPROVED OFFNER STRUCTURES WITH DIFFERENT FOVS.
DISPERSION RADIUS (MM)
FOV (MM)

TRADITIONAL OFFNER
STRUCTURE

IMPROVED OFFNER
STRUCTURE

(0, 0)

6.2

4.2

(± 10, 0)

8.5

2.7

(± 30, 0)

50.5

2.7

(± 50, 0)

151.5

3.5

(± 100, 0)

601.6

4.5

(± 150, 0)

1,503.2

4.2

along-track of (a) 2.3° and (b) 1.4°, respectively.
DECEMBER 2019

IEEE GEOSCIENCE AND REMOTE SENSING MAGAZINE

27



IEEE Geoscience and Remote Sensing Magazine - December 2019

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