I'm checking pulse in CRO monitor(615 milliseconds duration), but below code output is zero.
What is a CRO monitor?
You have completly ignored the information in the previous posting about pulseIn() requiring digital signal levels. It is completely inappropriate for the signals you have.
int s1 = analogRead(A3); //digital values 0-1023 duration = pulseIn(s1, HIGH);
pulseIn() takes a pin number as the first parameter.
I hate to say it, but given this thread so far, and you efforts at using pulseIn(), I do not think you have enough understanding of the Arduino, your sensor, or basic electronics to solve your problem.