Apparatus for measuring the luminous lifetime of samples
First Claim
1. In an apparatus for measuring the luminous lifetime of samples comprising a multichannel time-to-amplitude converter having N channels numbered 1 through N wherein N is a positive integer, said converter comprising a start pulse input means for receiving a start pulse and a stop pulse input means for receiving a plurality of stop pulses, wherein each of said channels includes a flip-flop having its set input connected to said start pulse input means and having an output connected to a time-to-amplitude converter connected to a sample and hold means;
- and wherein said flip-flop of channel 1 has a reset input connected to said stop pulse input means and said channels 2 through N are arranged such that reset inputs of their respective flip-flops are connected to said stop pulse input means through corresponding gate means, each corresponding gate means of channel N having an enabling input connected to and controlled by a corresponding flip-flop of said channel N-1 such that said start pulse sets all of said flip-flops and a first stop pulse resets said first flip-flop and a second stop pulse resets said second flip-flop . . . and N stop pulse resets said N flip-flop, the improvement comprising;
a plurality of voltage adders each connected to a corresponding sample and hold means;
a plurality of variable offset voltage means each connected to a corresponding one of said plurality of adder means wherein each offset voltage may be manually adjusted so as to compensate for errors in a time axis of its corresponding channel.
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Abstract
An apparatus for measuring the luminous lifetime samples, which eliminates the deviation of the time axis of each channel of a multichannel TAC, deviations resulting from differences the wiring or the time lag of the elements of each channel of the multichannel TAC constituting a principal part of the apparatus. The apparatus operates by adding a respective variable offset voltage to the output of each channel of the TAC and by regulating the offset voltage in every channel without using any delay element so as to eliminate the time axis deviations of the channels.
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Citations
3 Claims
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1. In an apparatus for measuring the luminous lifetime of samples comprising a multichannel time-to-amplitude converter having N channels numbered 1 through N wherein N is a positive integer, said converter comprising a start pulse input means for receiving a start pulse and a stop pulse input means for receiving a plurality of stop pulses, wherein each of said channels includes a flip-flop having its set input connected to said start pulse input means and having an output connected to a time-to-amplitude converter connected to a sample and hold means;
- and wherein said flip-flop of channel 1 has a reset input connected to said stop pulse input means and said channels 2 through N are arranged such that reset inputs of their respective flip-flops are connected to said stop pulse input means through corresponding gate means, each corresponding gate means of channel N having an enabling input connected to and controlled by a corresponding flip-flop of said channel N-1 such that said start pulse sets all of said flip-flops and a first stop pulse resets said first flip-flop and a second stop pulse resets said second flip-flop . . . and N stop pulse resets said N flip-flop, the improvement comprising;
a plurality of voltage adders each connected to a corresponding sample and hold means; a plurality of variable offset voltage means each connected to a corresponding one of said plurality of adder means wherein each offset voltage may be manually adjusted so as to compensate for errors in a time axis of its corresponding channel. - View Dependent Claims (2, 3)
- and wherein said flip-flop of channel 1 has a reset input connected to said stop pulse input means and said channels 2 through N are arranged such that reset inputs of their respective flip-flops are connected to said stop pulse input means through corresponding gate means, each corresponding gate means of channel N having an enabling input connected to and controlled by a corresponding flip-flop of said channel N-1 such that said start pulse sets all of said flip-flops and a first stop pulse resets said first flip-flop and a second stop pulse resets said second flip-flop . . . and N stop pulse resets said N flip-flop, the improvement comprising;
Specification