Research & Development Services

Model 845 Rechargeable Battery

The Model 845 battery is a 4 V rechargeable lithium-ion cell of novel design that is only 8 mm in diameter and 4.5 mm in height. The cell was developed under the auspices of the National Institute of Aging to enable a new generation of hearing aids that do not require regular battery replacement. The battery has a design life of about 1,500 charge/discharge cycles, equivalent to the average 4-year lifetime of a hearing aid, and does not suffer from memory effects common to other chemistries. It has a capacity of 10 mAh and can be discharged at rates of up to 10 mA. The 10 mAh capacity is sufficient to power a hearing aid for one day. A hearing aid based on this battery offers the advantages of: cost savings—no replacement batteries to purchase; ease of use—no small batteries to handle; safety—no small batteries swallow or insert in the ear. Additionally, the cell may be pulse-discharged at rates of 100–200 mA which offers the opportunity for exciting pulse power applications.

Research International reserves the right to change specifications on any of the devices mentioned without prior notification.

For more information, see:

• Model 845 specifications (PDF, 99 KB)

Hazard Card

Personal Monitor for the Detection of
Exposure to Hazardous Gases

The Hazard Card provides a platform for a wide variety of sensor elements. Research International has worked primarily with chemiresistor and electrochemical sensors that can be incorporated into the device. These sensors are in different stages of development and promising results have been obtained. Hydrogen sulfide and carbon monoxide are considered the most common toxic gas hazards in confined spaces. The Hazard Card can be designed to sense either of these gases by selection of the appropriate detector. By incorporating two sensors, it will detect both of these toxic gases. The total system is powered by high-energy lithium primary cells.

FAST 2000

Rapid, Portable, Fluorometric
Assay System

The Flow Assay and Sensing System (FAST) is a second-generation instrument, developed under contract to the Naval Research Laboratory (NRL) as a rapid, portable system for performing flow immunoassays with detection limits to 1 part per billion. The FAST 6000 can be configured either as a single channel, single analyte instrument or as a six channel, six analyte instrument, capable of performing six simultaneous assays for six different analytes on the same sample. The system is completely self-contained, needing only a bottle of buffer and a waste bottle for field operation.

Ferret II

Spectral Scanning PC Card

Research International has developed a PC-based high-resolution, narrow waveband, spectral scanner, the Ferret II Plus, that is ideal for the interrogation of any single- or multi-mode fiber optic sensor with a reflectance spectrum containing one or more sharp lines. The Ferret works especially well with sensors based on fiber optic Bragg gratings. The card continuously scans the spectrum of a long-lived LED, used as the light source, and measures the wavelength of reflectance peaks found in the recovered signal. PC-resident software converts changes in the wavelength of these reflectance peaks into values of the measured parameter, based on a calibration curve, and displays the data in real time on the video display of the PC. The Ferret, using appropriate fiber sensors, has demonstrated the capability to monitor strain to levels below 1 microstrain, temperature to 0.05°C, and pressure to 0.025% of full scale.

ChemCard 2000

The ChemCard2000 is an integrated fiber optic measurement system consisting of an opto-electronics interface on an ISA bus card and a software package for data acquisition and display. Any sensing method that changes its spectral characteristics in response to an analyte at the operating wavelengths of the ChemCard may be used. Prototype sensors have been developed at Research International for a number of analytes including pH, hydrogen gas, humidity, aromatic hydrocarbons, and temperature. The miniature optical pH sensor, based on pH dyes similar to those used in litmus paper, is available for industrial and biomedical applications. It operates via an immobilized indicator that is contained within a stainless steel microprobe 3.81 cm long and .033 cm in diameter.