Title:
SPECTROPHOTOMETER
Document Type and Number:
Japanese Patent JP2003214953
Kind Code:
A
Abstract:
To enable a high-resolution high-sensitivity analysis by maintaining the A/D converter input voltage constantly at an appropriate level across the whole wavelength range.
Light after transmission through a specimen in a cell 1 is detected by a photodiode 2, the trace current out of the photodiode 2 is converted and amplified by use of a preamplifier 3 and a feedback resistance 7, the voltage is let through an A/D converter 4 and then read by a CPU 5, and specimen ingredients are detected by use of data based on the signals. The feedback resistance 7 may be set to be variable, and a proper value is selected for the feedback resistance 7 according to the voltage to be put into the A/D converter 4.
Inventors:
BUNGO HAJIME
Application Number:
JP2002019321A
Publication Date:
July 30, 2003
Filing Date:
January 29, 2002
Export Citation:
Assignee:
SHIMADZU CORP
International Classes:
G01J3/32; G01J1/44; G01J3/02; G01J3/42; (IPC1-7): G01J3/32; G01J1/44; G01J3/02
Attorney, Agent or Firm:
Toshifumi Kita (1 person outside)
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