UV-Visible/NIR Spectrophotometer UH5700

Features

Handling the ultraviolet, visible, and near-infraredregions (190 to 3,300 nm), the UH5700 achieves both high measurement precision and high throughput

Use of a continuously variable slit

The UH5700 employs a continuously variable slit in the near-infrared region, in which the slit automatically widens when measuring low quantities of light and narrows when measuring large quantities of light, and thereby achieves low-noise measurements across a broad range of measurement wavelengths from 190 to 3,300 nm.

Low stray light

The UH5700 achieves best-in-class levels of low stray light and high photometric range through use of a Czerny-Turner mounted single-monochromator bright spectrometer and a newly developed grating using photolithography technology. *1

*1Hitachi High-Tech Analysis survey of models marketed within Japan (single monochromator instruments supporting near-infrared wavelength range) as of April 2019

Measurement throughput improvements

By employing a gear-drive system for the wavelength drive, high scanning speeds compared to conventional instruments are achieved of approximately 0.3 to 5,000 nm/min in the ultraviolet-visible region. *2 When measuring at a 1 nm interval, a measurement made at 1,000 nm/min in the 190 to 3,300 range can be completed in approximately 4 minutes.

*2U-3900 : 1.5 to 2,400 nm/min, U-2900 : 10 to 3,600 nm/min.

Control of detector switching level difference

Generally, UV-visible/near-infrared spectrophotometers use different detectors in the UV-visible region and the near-infrared region. Because different detectors are used, a difference in photometric values may arise in switching between detectors. Through know-how developed from the fundamentals, signal processing technology, and other techniques, the UH5700 holds the level difference when switching detectors to a minimum.

Common utilization of accessories

The sample compartment shares a common design with the U-2900/U-3900 spectrophotometers, so you can use the accessories you already have.*3 We offer an extensive line-up of accessory types tailored to measurement objectives.

*3Except for certain accessories (please check with your sales representative for details)

Specifications

Example of application

Measurement of hexavalent chromium (diphenylcarbazide absorptiometry)

We present an example of analysis by diphenylcarbazide absorptiometry of hexavalent chromium, which is subject to regulation by the RoHS directive. Hexavalent chromium was measured using “Reagent Set for Water Analyzer No. 31 Chromium (Hexavalent)” made by Kyoritsu Chemical-Check Lab., Corp. From the absorption spectrum measurement results, the presence of an absorption peak at a wavelength of 540 nm was confirmed. Good linearity was obtained for the calibration curve at the 540 nm absorption peak with R2 = 1.0000.

Measurement of silica (molybdenum yellow absorptiometry)

The measurement for silica by molybdenum yellow absorptiometry is prescribed in JIS K0101 Testing Methods for Industrial Water. Silica was measured using “Reagent Set for Water Analyzer Silica” manufactured by Kyoritsu Chemical-Check Lab., Corp. From the absorption spectrum measurement results, the presence of an absorption peak at a wavelength of 815 nm was confirmed. Good linearity was obtained for the calibration curve at the 815 nm absorption peak with R2 = 0.9999.

Measurement of absorption spectrum of near-infrared light absorbing dyes

Near-infrared light absorbing dye powders were dissolved in toluene to produce samples for measurement. Spectra were obtained with maximum absorption peaks around wavelengths of 800 to 1000 nm. Spectra were obtained with a low step size at the detector switchover wavelength of 850 nm. The wavelength range and detection method used can be set in the UV Solutions Plus specialized software, and multiple peaks can be simultaneously detected. In addition, peak detection results can be displayed in tabular form.

Measurement of filters

Filters allow light at specific wavelengths to pass through. Filters A, B, and C passed light in the blue, green, and red regions, respectively, and filter D passed light in the entire visible region.

Color measurement (optional package)

The light source, field of view, and other such parameters were set using spectra from the standard method (wavelength range 360 to 830 nm, 1 nm interval) and the practical method (wavelength range 380 to 780 nm, 5 nm interval), and color calculations were carried out. Color calculation results can be plotted onto chromaticity coordinates.

Measurement of window glass and coatings

Near-infrared light from the sun is a source of heat that can pass through glass windows and cause the temperature of a room to rise. Because of this, functional glass has been employed in recent years that cuts near-infrared light. In addition, functional coatings have been used on the outer walls of buildings to reflect near-infrared light. The optical characteristics of functional glass and functional coatings were measured.

Light/solar direct (glass) calculation results

Calculations using optional package

Calculations can be performed that conform to the test methods pertaining to the transmittance (reflectance) of plate glass (visible light transmittance, solar transmittance, solar reflectance) as specified in Japanese Industrial Standards JIS R3106-2019.

Solar reflectance (paint) calculation results

Calculations using optional package

Calculations can be performed that conform to the method for obtaining the solar reflectance of paint specified in Japanese Industrial Standard JIS K5602-2008, and to the test method pertaining to high solar reflectance paint for roof use (solar reflectance) specified in Japanese Industrial Standard JIS K5675-2011.