Philtec, Inc.

PHILTEC: Custom Fiberoptic Sensors for Non-contact Measurement of Linear Distance, Displacement and Vibration

D Model Analog Sensor Dimensions

Analog sensors are fast responding units ideal for relative motion measurements in dynamic applications:

  • DC-20 KHz is standard
  • DC-200 KHz or higher is optional
  • DC-100 Hz provides best resolution

Standard analog units include:

  • Electronics with 0 to +5 VDC output
  • 3 foot long fiberoptic cable

Analog Output

Calibration charts are provided with each sensor tip giving the near and far side voltage output responses to distance. There are three ways to derive accurate distance measurements:

  1. within the bounds of the linear range, multiply sensitivity by the change in voltage output
  2. create a lookup table using the XY calibration data points
  3. use a polynomial curve fit to accurately map the sensor’s output function

The effect of changing target reflectance is to shift the voltage output higher or lower. A gain control is provided for calibration of the sensor output to various target surfaces. Insitu calibration is performed simply, by adjusting the sensor’s tip-to-target gap until the peak output is attained, and then by using the gain control to set the peak voltage reading to full scale. This allows the sensor to be used to perform precision linear motion measurements on most materials.

Amplifier Options

Option CodeFeature
A1Temperature Stabilized Amplifier Minimizes Long Term Drift
G1 ADDITIONAL OUTPUT, DC COUPLED WITH 10x GAIN and ADJUSTABLE DC OFFSET
G2 ADDITIONAL OUTPUT, AC COUPLED WITH 10x GAIN
G3Additional Output, Binary TTL Output, 0/5 volts
H1HIGH FREQUENCY AMPLIFIER FOR D MODELS UP TO 200 KHZ BANDWIDTH
H2HIGH FREQUENCY AMPLIFIER FOR D MODELS ABOVE 200 KHZ TO 1 MHZ BANDWIDTH
+H1ADDITIONAL OUTPUT FOR D MODELS WITH BANDWIDTHS UP TO 200 KHZ
+H2 ADDITIONAL OUTPUT FOR D MODELS WITH BANDWIDTHS EXCEEDING 200 KHz UP TO 1 MHZ
L LOW FREQUENCY AMPLIFIER (< 20 KHz), 100 Hz STD
+L ADDITIONAL OUTPUT WITH LOW FREQUENCY BANDWIDTH (< 20 KHz), 100 Hz STD
M DIGITAL DISPLAY – DC VOLTS
O ADJUSTABLE DC OFFSET
P POLYNOMIAL CURVE FIT TO SPECIFIED CALCULATION RANGE
Q CONNECTORIZED AC/DC POWER ADAPTOR AND BNC OUTPUT
R1AMBIENT LIGHT REJECTION – STANDARD UNITS ARE SENSITIVE TO BROADBAND LIGHT FROM 400 – 1100 nm. WITH OPTION R1, INCOMING LIGHT IS BLOCKED FROM <800 to >900 nm.
R2BLUE LIGHT FILTER, 470 nm ±50 nm.
V PROVIDES SENSOR AMPLIFIER WITH 0 – 10 VOLT OUTPUT