Glossary

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ADJUST COMMAND: The ADJust command is used to adjust the Stroke output to compensate for variation in loading caused by variation in HUDs and the associated connection hardware.  It is recommended that an ADJUST be performed before each new HUD is tested.  A suitable warm up and stabilization for the HUD and Stroke Generator should be permitted.  The SE 1450 Stroke Generator’s recommended warm up time is a minimum of 5 minutes.

BORESIGHT CALIBRATION: Aligning the crosshairs of a Heads-Up Display (HUD) with the gun boresight of an aircraft

BRIGHTNESS:

        Area Brightness The Area Brightness may be a more accurate measurement of display luminance than Peak Brightness because phosphor granularity and other variations can be averaged.  However the entire area being sampled must be illuminated for effective measurement.  The size of the area being sampled is user selected.

        Peak Brightness The Peak Brightness is a measurement of the luminance intensity of a line.  The brightest point in the cross section profile of the line is reported using all of the luminance correction factors. The Peak Brightness can be calculated using a single row of pixels across the line or an average of 16 or 64 lines of pixels.  Averaging has the advantage of increasing the accuracy of the measurement but can be misleading if the line is not perpendicular to the detector axes. 

CRTCathode Ray Tube

DASH (Display Analysis System...Highspeed): DASH is an acronym developed by Spectron to describe the equipment  designed for automated display testing.  The DASH system is composed of the Core DASH System, the DASH Fixturing, the DASH Self-Alignment Systems and DASH Accessories.  DASH systems are capable of testing  Head-Up Displays (HUDs), Heads-Down Displays (HDDs) and Helmet-Mounted Displays (HMDs).

EEPROM: Electronically Erasable Programmable Read-Only Memory

EPROM: Erasable Programmable Read-Only Memory

F.O.B. Wheat Ridge, Colorado:  Free On Board Wheat Ridge, Colorado dictates that ownership and liability for the goods being shipped from Spectron transfers to the buyer (including payment of all transportation and insurance cost) as soon as it leaves our building. 

LINE WIDTH: The Camera can measure line widths from a maximum of ~1.2 degrees to a minimum of ~0.05 degrees.  This is limited on the high side by the field of view and on the low side by the pixel pitch of the detector.  Lines smaller than 0.05 degrees can be measured, at reduced accuracy, down to the absolute limit of ~0.015 degrees. 

Line Width can be calculated using a single row of pixels across the line or an average of 16 or 64 lines of pixels.  Averaging has the advantage of increasing the accuracy of the measurement but can be misleading if the line is not perpendicular to the detector axes.

LINEAR RAMP: A voltage range in the altitude and azimuth axises represent the position of the stroke display beam on the HUD. A linear ramp is the change of voltage (in time) within one axis that essentially controls the movement of stroke display beam within that axis.  The rate of change of the voltage remains constant within each linear ramp (there are three different writing speeds: fast, slow and fail) and controls the brightness of the image displayed on the HUD.  

METROLOGY: Attaining traceability through calibration by establishing a relationship between the output of a measuring instrument and the value of a measurement standard.

NET 30: A form of trade credit which specifies that payment is to be received within 30 days of the delivery of goods.

NIST TRACEABLE: The National Institute of Standards and Technology (NIST) supplies industry, academia and government with over 1,300 Standard Reference Materials (SRMs) of the highest quality and metrological value.  By using such materials to perform our metrology and calibrations, Spectron's measuring systems can be traced back to the NIST standards of measurement.

NRE (Non-Recurring Engineering): Refers to a one-time cost imposed upon a customer to cover the Time and Materials required to develop a specific product

PARALLAX Parallax is a measurement of the angular shift in the position of a line when the viewer’s eye position is moved laterally.  Parallax is an indication of the apparent distance to the image.  An image at an infinite distance will exhibit zero parallax.  A parallax measurement with the SE1420 DASH is performed by an internal sequence of measurements: a Line Center, a shift in X or Y position, another Line Center and a return to the original X or Y position.

PHOSPHOR PROTECTION CIRCUITRY Circuitry built in to a Head-Up Display (HUD) to prevent the stroke display beam from destroying the phosphor in the display.  Such phosphor destruction can occur if the stroke display beam moves too slowly, exposing the phosphor plane to high levels of intensity.   

PHOTO-DIODE MATRIX DETECTOR: A two-dimensional camera detector that proportionally converts light into a voltage

POSITION (LINE CENTER) Line Center measurement is a composite measurement in the SE1420 DASH system.  The position of a line in the Camera field of view is mathematically combined with the position of the Altitude and Azimuth transports to get the final angular position of the line. The Line Center can be calculated using a single row of pixels across the line or an average of 16 or 64 lines of pixels.  Averaging has the advantage of increasing the accuracy of the measurement but can be misleading if the line is not perpendicular to the detector axes.

SPECTRO-RADIOMETICS: Spectron's procedure for calibrating the sensitivity of the detector across the spectrum. 

T & M (Time and Materials): A way to quantify (in dollars) services rendered.

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