Range test chamber
US5392631A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 21, 1994 |
| Grant date | Feb 28, 1995 |
| Priority date | — |
| Expiry date | Jun 21, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P21/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A scaled, isolated range test chamber is provided for testing motion sensors, such as ultrasonic occupancy detectors, in which the detector to be tested is mounted on a drawer and slid into an enclosed chamber. The enclosed chamber includes multiple motion simulators, such as rods rotated by stepper motors, which are controlled by computer to provide an accurate and repeatable scaled test environment. The ultrasonic radiation is concentrated by the scaled test environment to avoid testing anomalies resulting from time and temperature changes or human error factors. A master sensor is calibrated to detect the predetermined minor motion of the movement of a human hand in an arc through a discrete distance of one foot in one second. The motion simulators are adjusted to rotate through a larger arc at a closer distance to be detected by the master sensor in order to determine the equivalent simulated minor motion. Production sensors are then tested in the chamber using the simulated minor motion of the motion simulators.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.