Non-Contact Color Measurement Reduces Sample Prep Time and Improves Accuracy


Posted on June 28, 2018

A popular food manufacturer has a huge number of different snack products in its line, from chips to cookies to crackers. But to determine whether these products are consistent in color from batch to batch, the manufacturer has to perform potentially hundreds of individual color quality control tests each day. This is an immensely time-consuming process; an operator could easily spend a full shift just preparing and testing these samples one by one if using a standard spectrophotometer. Not only does it take a great deal of time to perform these measurements, it sample preparation itself is often a laborious and time-consuming process; the operator has to thoroughly scrub the sample holder between measurements and check the instrument’s sensor for scratches and stray crumbs. Even if the operator only spends five minutes cleaning and preparing the holder for each sample, this could add up to hours of extra work.

In many industries, sample prep is one of the most time-consuming steps in the color quality control process.1 However, sample prep times aren’t the same for every spectrophotometer. When you use a non-contact instrument like HunterLab’s Aeros, you may significantly reduce the time and labor you spend preparing your samples.

Contamination Leads to Longer Prep Time

Contamination is a major challenge when you perform color quality control tests on a sample. This is an especially common problem with loose powder, oily samples, and textured samples, such as ground coffee or potato chips coated with seasoning. Products like these are more prone to contaminating future test samples because they contain very small particles that can be difficult to spot with the naked eye.2Unless you spend time preparing each sample carefully and cleaning your equipment thoroughly between measurements, you may miss these small particles completely, ultimately interfering with the accuracy of subsequent measurements.

A good example of this is when you test a sample of cookies that are coated with powdered sugar. To prepare a cookie sample for color measurement, you typically have to house the sample inside of a plastic or glass holder with a protective lid. This lid prevents the sensor from touching the sample directly and getting damaged as a result. However, even if you use a protective lid to prevent your sensor from coming into direct contact with the cookie sample, you’ll still have to clean out the powdered sugar residue that the cookies left behind inside of the sample holder. Any leftover powdered sugar in the holder can alter the color reading of your subsequent samples, skewing your results. This is why operators usually spend at least a few minutes thoroughly cleaning the surface of the holder in between readings.3 And these minor cleaning preparations add up over time.

Non-Contact Spectrophotometers Prevent Contamination

When you use a non-contact spectrophotometer, you limit the risk of contaminating your samples and lower your prep time in the process. Unlike most spectrophotometers, with a non-contact instrument, the sensor never touches the sample or the sample holder directly. The Aeros, for example, automatically adjusts its height so that the sensor is always suspended just above the sample (this is what makes the instrument “smart”). You won’t have to waste time cleaning or replacing a damaged sensor because your sensor remains undisturbed even after thousands of measurements.

Some non-contact spectrophotometers also reduce prep time by simplifying the cleaning process for the sample platform. The Aeros has a removable platform that can be cleaned and replaced within moments without having to clean or move the rest of the instrument. This removable platform is also durable, meaning that you won’t have to clean out small grooves or cracks in the surface, saving you potentially hours of extra cleaning work over time. Additionally, all of the instrument’s components are fully sealed, preventing any small particles from getting stuck. Overall, these features make it easier to maintain a clean instrument with minimal effort.

Finally, non-contact spectrophotometers limit prep time and minimize risk of contamination by eliminating the need for protective sample holders. Most spectrophotometers require you to use a sample holder that has a clear glass or plastic lid which protects the sensor from touching the sample and getting damaged; the sensor touches the plastic or glass instead. However, over time, this protective layer can become scratched and contaminated with sample particles. When this happens, the sensor can’t accurately detect the color of the sample through the cloudy, scratched secondary surface, compromising the accuracy of your readings. To prevent this, you must replace your sample holder lids frequently and prepare every sample carefully to avoid scratching the lid. A non-contact instrument removes the need for this extra step, saving you time and unnecessary prep work.

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