EXHIBIT 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We have issued our report dated January 9, 2009, accompanying the consolidated financial statements and schedule included in the Annual Report of Irvine Sensors Corporation on Form 10-K for the year ended September 28, 2008, which report expressed an unqualified opinion and contains an explanatory paragraph relating to substantial doubt about Irvine Sensors Corporation’s ability to continue as a going concern. We hereby consent to the incorporation by reference of said report in the Registration Statements of Irvine Sensors Corporation on Forms S-8 (Nos. 2-85501, 333-72201, 333-94071, 333-68846, 333-73894, 333-76756, 333-102284, 333-105066, 333-115283, 333-124868, 333-140785 and 333-148692).

/s/ Grant Thornton LLP

Irvine, California
January 9, 2009