Optical measurement device for trace liquid sample

Details Optical measurement device for trace liquid sample Optical measurement device for trace liquid sample

2006-04-03

2010-11-09

Toatley, Jr., Gregory J (Department: 2877)

Optics: measuring and testing

For light transmission or absorption

Of fluent material

C356S246000

Reexamination Certificate

active

07830520

ABSTRACT:
In a spectrophotometer for measuring transmitted light of a trace liquid sample, four sample holders12are provided on a disk-like sample plate11while spaced apart by 90 degrees. The sample plate11is driven to rotate so that each of the sample holders12is sequentially moved to a sample supply position U1, a measuring position U2, a wiping position U3and a waiting position U4. At the sample supply position U1, a trace amount of the liquid sample is dropped into a groove of the sample holder12. Then at the measuring position U2, a window plate22is lowered onto the groove so as to determine the optical path length. Next, measurement of the transmitted light is performed. Further, while the sample holder12moves from the measuring position U2to the waiting position U4, the liquid sample is absorbed and removed by contact with a cleaning pad26. The liquid sample attached to the window plate22is wiped out by another pad. Since the operation to wipe off the measured sample is automatically performed, it is possible to improve the throughput of the measurement.

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NanoDrop ND-1000 Overview (online), NanoDrop Technologies LLC, U.S., Searched on Mar. 15, 2006, on the Internet <URL: http://www.nanodrop.com
d-1000-overview.html>.

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