Attachment_1.pdf

CSS 04-3012

JULY 2020

CALIBRATION SUPPORT EQUIPMENT

SALIENT SPECIFICATION

FOURIER-TRANSFORM

INFRARED SPECTROMETER

DEPARTMENT OF THE NAVY

METROLOGY AND CALIBRATION PROGRAM

Prepared by: MS33

Measurement Science Department Code MS 33

Purchase Specification

Table of Contents

1. SCOPE

1.1 General

1.2 Usage

2. EQUIPMENT REQUIREMENTS

2.1 General

2.2 Display Output

2.3 Humidity Control

2.4 Optical Requirements

2.5 Interferometer

2.6 Detector

2.7 Sample Compartment

2.8 Built-in Self-Checks and Standards

2.9 Warranty

3. MEASUREMENT CAPABILITY

4. PERFORMANCE CAPABILITY

4.1 Software Capability

4.2 Compatibility

4.3 Display Output

1. SCOPE

1.1 General

This document specifies the minimum requirements for a Fourier-Transform Infrared (FTIR) Spectrometer. Equipment discussed in this purchase specification is intended for use in operational conditions within a temperature and humidity controlled laboratory environment where Navy calibration equipment is operated. Laboratories may be shore-based or shipboard. While in transportation or storage, the equipment may be subjected to conditions aboard military and commercial vehicles on land, sea, and air.

1.2 Usage

The equipment covered by this purchase specification is intended for use by Navy calibration technicians to verify the cleanliness of solvent-cleaned instruments from Navy oxygen systems.

Laboratory environments are typically temperature-controlled to 73±9 °F and relative humidity is controlled to 20%-60%. However, spectrometers are also to be suitable for shipboard use where relative humidity may be higher.

2. EQUIPMENT REQUIREMENTS

2.1 General

The FTIR system shall be of compact size and highly portable. It shall have an integrated industrial class touch panel PC to save space and improve mobility. Its footprint shall be smaller than 25 x 35

cm. The touch panel PC shall run Windows 10 Professional or better OS to be 100% compatible with Navy IT policy and the spectroscopy software shall be specifically designed for touch interface with intuitive workflow for performing routine FTIR quantitative analysis. The workflow shall completely cover all analytical steps of background & sample measurement, quantitative (such as PLS) evaluation, result display, and report generation, and data archiving. The FTIR Spectrometer shall not require an external user interface device due to reduced mobility and increased space requirements for these peripherals. No separate laptop, desktop PC, non-integrated touchscreen, keyboard or mouse shall be required.

2.2 Display Output

Results of sample analyses are to be clearly shown in a display that numerically shows the PLS-approximated hydrocarbon concentration in ppm as mineral oil. Acceptable samples will have less than 5 ppm hydrocarbons as mineral oil. (This is a go/no-go test).

2.3 Humidity Control

FTIR Spectrometer internal humidity shall be controlled by a user-replaceable desiccant pack or cartridge. The Spectrometer shall not require a dry purge gas for humidity control. The spectrometer shall contain an electronic sensor to measure the humidity in the device. An automated alert shall inform the operator if the humidity inside the spectrometer is above the acceptable threshold.

2.4 Optical Requirements

2.4.1 Optical Compartment

The optical compartment shall be sealed to protect optical components from dust, moisture, and other airborne contaminants. The FTIR Spectrometer shall not have a requirement for purge gas.

2.4.2 Optical Components

2.4.2.1 Transmissive Components

The FTIR Spectrometer shall have two optics versions available at the same price point. A version with KBr (Potassium Bromide) optics and a version with ZnSe (Zinc Selenide) optics are required to meet Navy requirements. The KBr version is intended for typical shore-based Navy laboratory operation whereas the ZnSe version is intended for operation in shipboard environments and in regions with high humidity. For the KBr version, the system is still required to contain a moisture sensor to measure the humidity in the device as specified in section 2.3. For the ZnSe version, all light-transmissive optical components such as beamsplitter and optical windows shall be made of ZnSe. The Navy may specify any combination of KBr version and ZnSe version. An FTIR spectrometer available with KBr optics only is not acceptable.

2.4.2.2 Reflective Components

All mirrors in the FTIR Spectrometer shall be gold-coated t maximize optical throughput in the mid- IR range (400 cm-1 – 4000 cm-1).

2.5 Interferometer

2.5.1 Vibration and Wear Resistance

The FTIR Spectrometer’s interferometer shall be able to withstand vibrations from nearby equipment in Navy calibration laboratories and shall withstand vibrations typically found in shipboard environments without adversely affecting measurements. The FTIR Spectrometer shall be equipped with a retro-reflecting cube-corner interferometer with a wear-free (frictionless) moving mirror design to ensure unlimited lifetime and insensitive to vibration interference which is expected in some of the operating environments. The cube-corner interferometer shall provide long-term system stability to eliminate any requirement for repeated PLS calibrations in order to achieve accurate and repeatable analytical results. Spectrometers employing electro-optical actuators (dynamic alignment) with flat mirrors to correct for interferometer instability are not acceptable. Spectrometers equipped with bearings are not acceptable due to added wear-induced maintenance, increased maintenance costs and downtime.

2.5.2 Alignment

The FTIR Spectrometer’s interferometer shall be permanently aligned and shall not require either automatic or manual alignment or adjustment.

2.6 Detector

The FTIR Spectrometer shall be equipped with a temperature-controlled detector to provide a high stability against variation of the external temperature which is expected in some of the operating environments. The Navy requires accurate and repeatable analytical results even when the external temperature may change unpredictably. A FTIR spectrometer not equipped with a temperature-controlled detector is not acceptable due to potential errors caused by external temperature change.

2.7 Sample Compartment

The sample compartment of the FTIR Spectrometer shall be readily user-interchangeable with other sampling modules to accommodate anticipated future Navy requirements. The sample compartment shall have a cell holder that will securely fit and position a Navy-designed 1mm sealed fixed pathlength liquid transmission cell at the optimal IR beam position of the FTIR Spectrometer.

The Navy has developed the transmission cell design for the specific application for which the Spectrometer is being purchased. The cell design is fixed and cannot be changed. The FTIR Spectrometer manufacturer shall be able to provide a compatible integrating sphere sample module to handle anticipated future requirements.

2.8 Built-in Self-Checks and Standards

2.8.1 General

The FTIR Spectrometer shall be equipped with fully automated instrument performance tests (both OQ (operational qualification) and PQ (performance qualification) which can be performed from the integrated touch panel PC. These automated tests shall ensure the operator that the Spectrometer is operating within specifications and shall notify the operator if any user actions are required (notifications shall include the need to replace a desiccant pack (section ) or to measure a new laser wavenumber. The FTIR system must be equipped with standard industrial wired Ethernet interface (and also optional wireless) for remote diagnostics if the instrument is indicating an error. FTIR instruments which do not provide wired Ethernet interface are not acceptable.

2.8.2 Modules

The FTIR Spectrometer’s OQ and PQ tests shall validate the performance of components within the sample compartment as well as components located within the base unit of the FTIR Spectrometer.

2.8.3 Validation Tests

At a minimum, the FTIR Spectrometer’s OQ and PQ tests shall validate the Spectrometer’s resolution, wavenumber accuracy (x-axis frequency), photometric accuracy, sensitivity (signal-to-noise ratio), energy distribution, and deviation of the 100% transmission line.

2.9 Warranty

The warranty of the FTIR Spectrometer shall be at least 10 years for the interferometer and for the laser and shall be at least 5 years for the IR source.

3. MEASUREMENT CAPABILITY

Wavenumber accuracy is critical to the Navy’s application. To meet the Navy’s measurement requirement, the FTIR Spectrometer shall have wavenumber accuracy that is better than 0.05 cm-1 with wavenumber precision that is better than 0.0005 cm-1. The wavenumber accuracy of the FTIR Spectrometer shall be validated by an automated OQ test (see 2.8)

4. PERFORMANCE CAPABILITY

The FTIR Spectrometer shall be capable of determining hydrocarbon contaminant concentrations in samples of 3M Company Novec 71DE solvent as follows in 4.1 to 4.3.

4.1 Software Capability

FTIR Spectrometer software shall be capable of performing an automated partial-least-squares (PLS) analysis of FTIR data based on a stored PLS calibration data set. Users without specialized training in advanced spectroscopic methods or PLS analysis shall be able to readily perform such analysis using a pre-programmed macro-type instruction set.

FTIR Spectrometer software shall be capable of utilizing a stored PLS calibration data set that is common to all Navy laboratories that will use this instrument. The spectrometer software shall not require individual user/operators to manually enter or to create a PLS calibration data set to perform an automated PLS analysis.

Software shall limit access to programming instructions to high-level users only. Software shall be able to “lock down” preprogrammed PLS instructions to prevent access to other (routine) instrument operators.

Software shall provide capability for inputting the actual calibrated pathlength of the liquid transmission that is used for a sample measurement and shall incorporate the actual cell pathlength into the PLS determination.

4.2 Compatibility

The FTIR Spectrometer manufacturer shall guarantee that the existing PLS calibration already built by the Navy will be able to transfer directly to the FTIR Spectrometer to eliminate the need of a costly and time-consuming process of recreating the PLS calibration. In addition, all data produced by the FTIR Spectrometer shall be fully compatible with existing FTIR spectrometers already purchased and in use by the Navy for this Navy-wide application.

4.3 Display Output

Results of sample analyses are to be clearly shown in a display that numerically shows the PLS-approximated hydrocarbon concentration in ppm as mineral oil. Acceptable samples will have less than 5 ppm hydrocarbons as mineral oil. (This is a go/no-go test).

2.9 Warranty