Schmidt + Haensch | Polarimeters
Polarimetry – Optical Activities
Classical physics teaches that light consists of electromagnetic waves, which vibrations are transverse
to the direction of propagation. Polarized light is light, which vibration pattern exhibits preference.
If natural light passes through a so called polarizing filter, most of its other vibrating directions will
be filtered out, leaving only one specific direction. If this light is oscillating then in only one direction,
it is called “linearly polarized”.
There is a great number of organic and inorganic substances being optically active in their crystalline,
liquid or dissolved state. That means, these substances are able to rotate the direction of oscillation
of polarized light around a determined angle. The principle of the polarimeter is accomplished if a dissolved
optically active substance is introduced between two polarizing filters, crossed at 90°.
The intensity of the light on the detector behind the second polarizing filter varies as a function of
the angular position of these two filters.
Optical rotation in general means that the polarization of the direction of light will be rotated for a
certain angle when penetrating an optically active substance. A simple polarimeter contains at
least the following parts:
At point zero, polarizer and analyzer are set in an angle of 90° towards each other, which means
that no light reaches the detector (0% transmission). As soon as an optically active substance
is introduced into the sample room, the transmission will be rising in consequence of the plane
of polarization. To measure the angle of the rotation, the analyzer is rotated up to a point where
the transmission of the detector is again at a minimum. Optical rotation is measured in degrees
of angle; this kind of instruments are thus called circle polarimeters.
In order to determine the exact compensation position, SCHMIDT + HAENSCH uses faraday modulation
as an electronic enhancement. Without mechanical transmission by a V-belt or gear being necessary,
we apply a direct coupling of optical encoder and analyzer in all measuring instruments.
That is how a high accuracy throughout the entire measuring range is achieved. Additionally,
these principles guarantee for short measuring times and no mechanic wear. Consequently, highest
sensitivity and fastest compensation time over the entire measuring range is archieved.
The continuous measurement is also allowing monitoring of muto-rotation.
Schmidt & Haensch | VariPol Series
The VariPol takes the proven S&H technology & more their 150 years’ experience in polarimetry to a new level
This new instrument has been designed with all the know-how of Schmidt & Haensch like the Automatic Wavelength Calibration, the fortified Aluminum core, the built-in quality indicator of samples as well as the check of calibration standards. The 100mm sample room is optimal for the needs of pharmaceutical and chemical laboratories. Its seamless shape makes it easy to clean.
The VariPol makes polarimetry faster than ever: The integrated Peltier system can change 10°C in 30 seconds to highest precision. After temperature stabilization, the measurement itself takes only 6 seconds! The new tension free design of our sample tubes allows a fast cleaning or exchange of the cover glasses without birefringence.
Low power consumption and with a modern standby mode it gives you fast reaction time and helps to preserve resources (Green Tech). LED light technology: the light source is maintenance free during the instrument’s lifetime, saving you maintenance costs and downtime. Wavelength modules can be exchanged on site to allow a flexible operation
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Schmidt & Haensch | Polartronic V
The fully automatic and high resolution allrounder polarimeter with continuous measurement
Main features:
Checking/Calibration
As the interference filters, which are used in circle polarimeters, suffer from age- and environment depending alteration, it might be necessary to check and eventually to readjust the wavelength precise periodically. This can be done with sucrose solutions or quartz control plates, a much more reliable method.
Quartz control plates are long-term stable examination standards for polarimeter. The sample room of SCHMIDT + HAENSCH polarimeter permits the vertical movement of quartz control plates as well as the free rotation (±360°) around their own axis. Only by a rotation it is possible to check if the plates are mounted without strain and permit an examination of the polarimeter according to processing regulations of international standards like ICUMSA and OIML. View Brochure
Schmidt & Haensch | Saccharomat V
Saccharomat – Worldwide unique quartz-wedge compensated sugar polarimeter
The Saccharomat is a fully automatic working sugar polarimeter.
Quartz has an optical rotatory dispersion (ORD) almost identical to that of a sucrose solution. This fact is exploited as a unique compensation mechanism using a quartz wedge in SCHMIDT + HAENSCH’s Saccharomat. This working principle is unique and is unrivalled today.
As the quartz and the sample react in an identical way to small shifts of wavelength, these shifts are being automatically compensated and the effect becomes irrelevant. This ensures long time stable high precision measuring results without the necessity of recalibration over the lifetime of the instrument. Highly advantageous is that dark samples with a high absorption may be measured at NIR wavelength (882,6 nm) after carefully filtration (see filtration unit “AutoFilt Z”) without additional clarification being necessary.
For the measurement of Pol and Brix values at the same time, the Saccharomat can be coupled directly with the refractometer measuring head creating a Purity Analyzer. This solution is very economical since there is no need for the additional electronic unit of the refractometer.
Main features:
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Schmidt & Haensch | Polartronic H 532
The fully electronic high resolution (0,0001°) circle polarimeter H532 with up to 5 wavelengths and highest precision.
Polartronic H532 is housed under the steel housing with large user programmable display and powerful software similar to the S&H refractometer ATR Series. The improved software implements amongst other features the input of sample identification numbers, statistic evaluations of multiple measurements, user definable printouts individually configurable for each of the 10 available methods, etc.
Main Features:
✔ Audit trail function
✔ Report generation
✔ Electronic signature
✔ Encrypted electronic data storage and archiving
✔ Data transfer to Excel
✔ Remote modus Features of Polartronic H 532
✔ Internal data memory (999 measurements)
Accessories:
Schmidt & Haensch | Unipol 2020
Fully automatic digital polarimeter particularly designed for pharmaceutical and chemical applications.
The entire measuring range of ± 360° is divided in several measuring ranges which can easy be selected by the menu.
The user-friendly menu structure of the instrument is easily operated with the splash-proof alphanumerical keyboard. Software enables the user to input sample ID-numbers, calculate statistics and configure user defined printout of the measuring results. The measuring values are shown on the large LCD display.
The standard model is equipped with the 589 nm wavelength. Other wavelengths on request.
Various polarimeter tubes are available for different applications. With the use of micro tubes smallest sample volumes are sufficient. The polarimeter Unipol 2020 is equipped with plug in connector for the temperature sensor of the S&H polarimetric tubes. If polarimeter tubes or quartz control plates with integrated temperature sensor are used the current sample or quartz temperature is indicated at the display.
The resolution of Unipol 2020 is in complete conformity to the European and American Pharmacopeia. GLP/GMP conform data can be transferred to printer or PC.
The Unipol 2020 is 21 CFR part 11 ready. In conjunction with the Software AQUISYS 2008 (option) all requirements of 21 CFR Part 11 will be performed:
Polarimeter Accessories:
NEW: Chemically resistant polarimeter tubes
NEW: Polarimeter tubes with self-sealing coupling for quick and safe connection/disconnection of water circulators
NEW: Triple Quartz Control Plates (TQCP’s)
Checking/Calibration
As the interference filters, which are used in circle polarimeters, suffer from age- and environment depending alteration, it might be necessary to check the wavelength precision periodically and to readjust the wavelength in case it’s out of range. This can be done with sucrose solutions or quartz control plates. Sucrose solutions are not very stable and have to be renewed regularly. Checking a polarimeter by a quartz plate is a much more reliable method.
Quartz control plates are long-term stable examination standards for polarimeter. The sample room of S&H polarimeter permits the vertical movement of quartz control plates as well as the free rotation (±360°) around their own axis. Only by a rotation it is possible to check if the plates are mounted without strain and permit an examination of the polarimeter according to processing regulations of international standards like ICUMSA and OIML.
Applications : Polarimetric concentration and purity analysis in food, pharmaceutical, cosmetic and chemical industry. View Brochure
Schmidt & Haensch | Visual Circle Polarimeter
Small Universal Polarimeter with Long-lasting LED illumination
The polarimeter has a circular scale of ±180° angular degrees divided into full degrees. Together with the Vernier scale rotations can be measured to a precision of 0.1° and with a little practice they can be estimated to a precision of 0.05°. The light source LED is a very long lasting illumination unit (life time approx. 50.000 hours).
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