What is PIND Testing?
Particle Impact Noise Detection (PIND) is designed to identify the presence of loose particles inside a device cavity to discover the contamination that potentially causes device failure. PIND testing is a non-destructive test method, using reliable internal electronic components such as relays, transistors, hybrids, integrated circuits, and switch particles.
How is a PIND Test Performed?
The necessary test systems are required to provide a variable frequency vibration, a calibrated high-impedance voltmeter for noise measurement during the test, and optical and electronic equipment for post-test measurements.
PIND testing uses a shaker as a linear motor to excite loose particles to move within the component cavity. Upon striking the lid of the cavity, some of the particle kinetic energy is converted to a wide-band acoustic pressure wave that travels through the lid to the attached media, and onto the top surface of the impact detection sensor.
The acoustic wave is measured by the sensitive ultrasonic crystal or crystals within the sensor and then converted into an electrical signal. To keep the particle traveling through, an accurate shock is generated to the shaker and controlled by the computer, monitoring the motion of the sensor.
Equipment Used in PIND Testing
PIND systems are computer-based test equipment used in PIND testing. The testing is usually used to detect particle contamination within the internal cavity of a device when X-Ray inspection is limited or not possible, like rad-hardened instruments.
Particle Impact Noise Detection System
Shaker
Sensor
PIND Testing Methods
2020
2052
2002
213
2005
2006
2007
2026
PIND Test Standards
MIL-STD-750
Calculated frequency range allowed: 40 to 130 Hz
MIL-STD-883
Calculated frequency range: 150 Hz
An alternate frequency can be used
MIL-STD-202
MIL-STD-883 Method 2020 (Conditions A &
