Sammon joined the Rams from Wigan in the summer for £1.2million but scored just once in his first 12 appearances for his new club.
But four goals in his last eight games, including the opener in Saturday's 3-1 victory against Leeds, has given the Irishman the confidence that he will be a success for Nigel Clough's side.
Sammon told the Derby Telegraph: "I'm really starting to find my feet and I was delighted to get another goal.
"As a striker, you are judged on goals and I'm always striving to score. I'm happy to have added another one to my tally.
"I was definitely pleased with my own contribution.
"I'm really enjoying my role in the team and getting back-to-back starts."