Appeal 2006-2381
Application 09/779,125
sample, a beam of light is passed through the sample to measure its
absorbance. A heating control means digitally controls the heating current
such that the monitored temperature value will approach a specified target
temperature value. A parameter setting means sets parameters that
determine response characteristics of the heating control means and adjusts
the parameters according to the kinds of elements to be detected. As a
result, the heating control means’ indicial response characteristics are
controlled in units of milliseconds when the tube is heated.
Independent claim 12 under appeal reads as follows:
12. A furnace-type atomic absorption spectrophotometer comprising:
a tube for heating a sample therein;
monitoring means for monitoring temperature of said tube and
outputting a monitored value indicative of the monitored temperature;
heating control means for digitally controlling heating current for
heating said tube such that said monitored value will approach a specified
target temperature value; and
parameter setting means for setting parameters that determine
response characteristics of said heating control means, said parameter setting
means adjusting said parameters according to kinds of elements to be
detected and thereby controlling indicial response characteristics of said
heating control means in units of milliseconds when said tube is heated by
said heating control means;
wherein said heating control means includes a calculator for digitally
obtaining a quantity of a specified operation of said heating control means
by a PID control calculation on difference between said monitored value and
said target temperature value and said parameter setting means serves to set
at least one of parameters for said PID control calculation.
2
Page: Previous 1 2 3 4 5 6 7 Next
Last modified: September 9, 2013