Microfabricated ice-detection sensor / Russell G. DeAnna, Mehran Mehregany and Shuvo Roy.

Format:

Book

Government document

Author/Creator:

DeAnna, Russell G., author.

Mehregany, Mehran, author.

Roy, Shuvo, author.

Contributor:

Lewis Research Center, issuing body.

U.S. Army Research Laboratory

Series:

NASA technical memorandum ; 107432.

ARL-TR (Aberdeen Proving Ground, Md.) ; 1355.

NASA technical memorandum ; 107432

Army research laboratory technical report ; ARL-TR-1355

Language:

English

Subjects (All):

European Commission. Linking Innovation, Finance and Technology (Program).

European Commission.

Learning and Innovation Fund to Test New Ideas (Programme : Bangladesh).

Levenson Institute for Training.

Liaison of Independent Filmmakers of Toronto.

Ice.

Cryobiology.

Frost.

Refrigeration and refrigerating machinery.

Air flow.

Detectors.

frost.

ice (water by form).

Genre:

Online resources.

Physical Description:

1 online resource (10 pages) : illustrations

Place of Publication:

Cleveland, Ohio : National Aeronautics and Space Administration, Lewis Research Center : U.S. Army Research Laboratory, June 1997.

Summary:

Knowledge of ice conditions on important aircraft lift and control surfaces is critical for safe operation. These conditions can be determined with conventional ice detection sensors, but these sensors are often expensive, require elaborate installation procedures, and interrupt the airflow. A micromachined, silicon based, flush mounted sensor which generates no internal heat has been designed, batch fabricated, packaged, and tested. The sensor is capable of distinguishing between an ice covered and a clean surface. It employs a bulk micromachined wafer with a 7 micrometers thick, boron doped, silicon diaphragm which serves as one plate of a parallel plate capacitor. This is bonded to a second silicon wafer which contains the fixed electrodes; one to drive the diaphragm by application of a voltage, the other to measure the deflection by a change in capacitance. The diaphragm sizes ranged from 1x1mm to 3x3mm, and the gap between parallel plate capacitors is 2 micrometers. A 200V d.c. was applied to the driving electrode which caused the capacitance to increase approximately 0.6pf from a nominal capacitance of 0.6pf when the surface was ice free. After the sensor was cooled below the freezing point of water, the same voltage range was applied to the drive electrode. The capacitance increased by the same amount. Then a drop of water was placed over the diaphragm and allowed to freeze. This created an approximately 2mm thick ice layer. The applied 200V d.c. produced no change in capacitance, confirming that the diaphragm was locked to the ice layer. Since the sensor uses capacitive actuation, it uses very little power and is an ideal candidate for inclusion in a wireless sensing system.

Notes:

"June 1997"--Report documentation page

"Prepared for the Smart Structures and Materials Conference sponsored by the Society for Photo-Optical Instrumentation Engineers, San Diego, California, March 2-6, 1997."

"Performing organization: NASA Lewis Research Center and U.S. Army Research Laboratory"--Report documentation page

Includes bibliographical references (page 10).

Online resource; title from PDF title page (NASA, viewed October 18, 2016).

Other Format:

Print version: Microfabricated Ice-Detection Sensor.

Microfiche version: DeAnna, Russell G. Microfabricated ice-detection sensor

OCLC:

227849212