A FAMILY OF HIGH PERFORMANCE, RUGGEDIZED INTEGRATED DETECTORS.

Spectra design concept

Maximum optical performance

• Improved pulse height resolution, high light output

Ruggedized design

• Vibration, shock and temperature

High Performance Integrated Detectors

Features

• Completely sealed system
  
• Operates to 150°C
  
• PHR 7.5% (10.5% at 150°C)
  
• Vibration, shock qualified
  

*Standard geoline detectors start at 11% or 12% and go to 14% plus at 150ºC!

Design qualification

Temperature Cycle (Pre-test)

• Thermal cycle unit from room temperature to 175°C.
  
• Test for functionality prior to and post thermal cycle.
  

Impact Shock

• 100g @ 11ms - 3 shocks; 2 axes (X, ±Z); 9 total shocks.
  

Vibration

• Random vibration bandwidth 50-500Hz per the following power spectral density
  profile:
  
• 50-80Hz @ 6db/Octave
  
• 80-500Hz @ 0db/Octave
  
• Level: 5g_rms
  
• Duration: 240 minutes/axis; 3 axes total (X,Y & Z)
  
• Temperature: 150°C to 10% (165°C)
  
• Post Test System Performance: Not to degrade more than 10%

Qualification

Unit Performance

Pre and Post - Thermal cycle plateau performance:

• Pulse Height - 1570 Vs. 1451
  
• Pulse Height Resolution - 7.9 Vs. 7.5% PHR

Pre and Post - Vibration plateau performance:

• Plateau start voltage - 1200 Vs. 1250 volts
  
• Plateau length - 150 Vs. 250 volts

Spectra Test Results

Standard Wireline and MWD Designs Vs. Spectraline^™ Results
Pulse Height - 1130 Vs. 1451 @ operating voltage of 1500 Vs. 1250 volts
Pulse Height Resolution - 9.7 Vs. 7.5% PHR

Standard Wireline and MWD designs vs. Spectraline^™ results

356 keV Region of interest

• Spectraline™ FWHM 8.8%
  
• Aluminum window STD design FWHM 11.5%

80 keV Region of Interest

• Spectraline™ FWHM 17.1%
  
• Aluminum entrance window STD design FWHM 22.1%
  

Availability
Wireline and multiphase flow detectors accepting prototype orders now - leadtime 14 weeks.
MWD detector available Q1 1999.

Measurement While Drilling

• Rated to 1000g shocks and 20g_rms vibration
  
• Designed to prevent counts under vibration.
  
• Rated up to +175°C.
  *See Major Features
  

Wireline

• Rated to 100g shocks and 5 g_rms vibration
  
• Rated to +90°C or +175°C.
  *See Major Features

Multi-Phase Flow Metering

Shock and vibration specifications depend on sub-application -subsea, platform or downhole. Temperature ratings from +50°C to +175°C.
*See Major Features

Major Features:

• Higher light output (than standard ruggedized assemblies)
  
• Improved Pulse Height Resolutions
  
• Reduced Power Consumption
  • Lower operating voltage
    
  • Reduced plateau start voltage
    
  • Improved plateau charteristics
    
  • Higher signal to noise ratio

• Reduced overall weight
  
• Unified hermetic package