# IO:I Filter Transmission Data # # Transmission curves for both IO:I filters have been measured in the lab on the bench. # The following data were obtained by the manufacturer at a temperature of 300K. In the # cryostat at operating temperature the transmission curve is shifted slightly to the # blue. See file ioi_filters_measured.txt for the original data as measured in the lab # at 300K. # # IO:I J Filter # Measured at 300K # Transformed to operating temperature of filter on the basis of non-directly-measured # assumptions. # * The temperature of the cooled filter inside the cryostat is not directly measured. # The array and other electronics are directly monitored, but not the filter itself. # Thermal corrections are therefore based on our best estimate of the filter temperature # being T_filt = -78C # * The filter transmission was measured at 300K only. Transformation to operating # temperature is based on the manufacturer's specification of typical performance. # The blue edge of the H filter has been shifted -2.9nm compared to the 300K measurement. # The red edge of the H filter has been shifted -2.5nm compared to the 300K measurement. # # Columns: # Wavelength (nm) # Transmission (%) # 997.0 0.2 1020.7 0.3 1046.9 0.3 1073.3 0.3 1096.8 0.4 1122.5 0.5 1136.0 0.6 1147.1 1.1 1153.4 2.4 1159.2 5.4 1162.9 10.0 1165.1 14.6 1167.3 20.0 1168.4 24.6 1170.0 30.1 1170.8 35.1 1171.9 40.1 1173.0 45.0 1174.1 50.0 1175.1 54.9 1176.4 59.9 1178.9 64.9 1181.9 69.2 1184.3 69.8 1187.8 70.1 1191.2 70.3 1194.6 70.1 1197.7 70.4 1201.0 70.3 1204.1 71.0 1207.4 72.0 1209.8 73.2 1211.0 74.3 1213.7 75.9 1214.6 76.5 1216.6 78.1 1219.0 79.4 1222.7 80.0 1224.6 80.4 1227.7 79.4 1230.9 78.4 1234.0 77.6 1236.2 76.7 1238.6 77.3 1242.5 77.7 1245.9 78.7 1248.3 79.5 1251.5 80.2 1252.8 80.9 1255.5 80.3 1258.4 80.3 1262.2 79.9 1266.6 79.6 1270.7 79.6 1273.3 80.2 1276.8 81.1 1279.4 82.0 1283.3 82.7 1285.8 83.6 1290.3 83.5 1294.8 83.0 1296.9 81.9 1301.1 81.2 1304.0 80.4 1306.9 80.2 1310.0 80.2 1312.9 80.3 1315.9 79.7 1317.0 78.9 1319.9 75.5 1322.9 69.9 1324.5 65.1 1326.0 60.0 1327.3 55.5 1328.8 50.0 1330.2 45.1 1331.4 40.0 1332.7 35.5 1334.1 30.1 1335.7 25.2 1337.8 20.0 1340.0 15.4 1344.2 10.1 1347.7 7.0 1353.1 4.2 1358.5 2.5 1365.2 1.5 1375.0 0.8 1387.9 0.5 1397.8 0.4 1425.5 0.4 1447.9 0.3 1474.6 0.3 1498.1 0.3 # # IO:I H Filter # Measured at 300K # Transformed to operating temperature of filter on the basis of non-directly-measured # assumptions. # * The temperature of the cooled filter inside the cryostat is not directly measured. # The array and other electronics are directly monitored, but not the filter itself. # Thermal corrections are therefore based on our best estimate of the filter temperature # being T_filt = -78C # * The filter transmission was measured at 300K only. Transformation to operating # temperature is based on the manufacturer's specification of typical performance. # The blue edge of the H filter has been shifted -8.9nm compared to the 300K measurement. # The red edge of the H filter has been shifted -5.5nm compared to the 300K measurement. # # Columns: # Wavelength (nm) # Transmission (%) # 1289.0 0.1 1339.3 0.1 1390.1 0.1 1415.5 0.4 1437.5 1.0 1450.7 2.6 1459.6 5.6 1465.1 9.3 1469.3 14.2 1472.5 19.2 1475.4 25.0 1477.2 30.1 1479.2 35.2 1480.8 40.1 1482.3 44.5 1483.7 50.0 1485.4 55.3 1487.2 59.9 1488.7 64.8 1490.7 68.4 1493.5 74.2 1497.4 78.4 1499.1 80.1 1501.9 81.9 1507.1 83.6 1511.9 85.2 1517.1 86.1 1522.5 87.4 1529.2 88.4 1533.9 88.8 1540.7 89.2 1547.2 89.3 1550.6 89.5 1559.8 89.8 1564.6 90.1 1567.5 90.2 1578.5 90.7 1581.2 90.9 1584.8 91.1 1591.8 91.6 1601.4 91.9 1605.6 92.2 1612.7 92.2 1622.0 91.8 1629.9 90.9 1635.8 89.8 1642.1 88.5 1649.0 87.0 1652.0 86.5 1655.3 86.1 1662.7 85.5 1671.7 85.4 1676.4 85.7 1682.3 86.1 1688.2 86.5 1692.2 86.7 1699.9 86.8 1701.4 86.8 1709.1 86.4 1715.8 86.1 1720.2 85.8 1725.3 85.8 1731.6 85.4 1739.0 84.0 1743.1 82.4 1747.3 80.1 1753.0 75.6 1758.2 70.0 1761.8 65.5 1766.0 60.0 1769.2 55.3 1773.6 50.0 1776.9 45.5 1781.3 40.1 1785.1 35.4 1789.8 30.1 1794.5 25.3 1800.1 20.1 1805.5 15.2 1813.5 10.0 1819.4 7.1 1826.7 5.0 1836.9 3.0 1844.8 2.0 1856.3 1.3 1874.1 0.7 1895.8 0.5 1925.7 0.4 1946.2 0.4 1997.4 0.2